CN115132040B

CN115132040B - Electric energy measurement secondary circuit wiring training set

Info

Publication number: CN115132040B
Application number: CN202210744472.2A
Authority: CN
Inventors: 方绍怀; 黄远胜; 蒋敬鹤; 王泉; 香柱平; 梁永昌; 邹聪; 李学鹏; 刁小玲; 董伟锋; 卢清伟; 袁博政; 罗锡铭; 李茜昕; 范祖明
Original assignee: Guangdong Power Grid Co Ltd; Dongguan Power Supply Bureau of Guangdong Power Grid Co Ltd
Current assignee: Guangdong Power Grid Co Ltd; Dongguan Power Supply Bureau of Guangdong Power Grid Co Ltd
Priority date: 2022-06-27
Filing date: 2022-06-27
Publication date: 2023-06-16
Anticipated expiration: 2042-06-27
Also published as: CN115132040A

Abstract

The invention discloses an electric energy metering secondary circuit wiring training device, which comprises: the first output end of the power module is electrically connected with the input end of the terminal strip, and the input end of the power module is used for accessing single-phase alternating current; the output end of the terminal block is electrically connected with the input end of the error wiring switch module, the output end of the error wiring switch module is electrically connected with the first end of the junction box, and the second end of the junction box is electrically connected with the electric energy meter; the output end of the error wiring switch control module is electrically connected with the control end of the error wiring switch module, and the power end of the error wiring switch is electrically connected with the second output end of the power module; the power module is used for converting single-phase alternating current into three-phase voltage current and direct current, outputting the three-phase voltage current through the first output end and outputting the direct current through the second output end. The invention can meet the training requirements of different wiring conditions of the metering secondary circuit and improve the skill level and professional quality of electric energy metering operation and maintenance personnel.

Description

Electric energy measurement secondary circuit wiring training set

Technical Field

The invention relates to the technical field of electric energy metering, in particular to a wiring training device for an electric energy metering secondary circuit.

Background

Along with the rapid development of national economy, the construction scale of the power network is larger and larger, the social electricity consumption is continuously increased, and the electric energy metering is taken as the only basis and method for the settlement of electric power trade, so that the accuracy and reliability of the electric energy metering device are very important. The correct wiring of the metering secondary circuit is the basis of accurate electric energy metering, and the inspection work of the metering secondary circuit needs operation and maintenance personnel of the electric energy metering device to finish, and the skill level and professional quality of the metering secondary circuit are one of key factors influencing the accuracy of electric energy metering.

Due to the carelessness or unnoticed voltage-current phase sequence and polarity during the installation and wiring of the electric energy metering instrument, wiring errors occur in the voltage or current loop, such as misconnection of the voltage or current phase sequence, reverse connection of the current polarity, open circuit of the voltage loop, and the like. The wiring error condition that operation and maintenance personnel of the electric energy metering device contacted on site work is single and easy to eliminate, if a new wiring error condition appears, the new wiring error condition is easy to be found out due to a great intention or insufficient skill level, and further the error wiring can not be corrected in time when the metering secondary circuit is checked, and once the metering device is put into operation, metering errors or accidents such as ammeter inversion, transformer explosion, personal electric shock and the like are caused.

Disclosure of Invention

The invention provides a wiring training device for an electric energy metering secondary circuit, which can meet training requirements for different wiring conditions of the metering secondary circuit so as to improve the skill level and professional quality of electric energy metering operation and maintenance personnel.

According to an aspect of the present invention, there is provided an electric energy metering secondary circuit wiring training device including:

the device comprises a power supply module, a terminal block, an error wiring switch control module, an error wiring switch module, a junction box and an electric energy meter;

the first output end of the power module is electrically connected with the input end of the terminal strip, and the input end of the power module is used for accessing single-phase alternating current;

the output end of the terminal block is electrically connected with the input end of the error wiring switch module, the output end of the error wiring switch module is electrically connected with the first end of the junction box, and the second end of the junction box is electrically connected with the electric energy meter;

the output end of the error wiring switch control module is electrically connected with the control end of the error wiring switch module, and the power end of the error wiring switch is electrically connected with the second output end of the power module;

the power supply module is used for converting single-phase alternating current into three-phase voltage and current and outputting the three-phase voltage and current through the first output end; the power supply module is also used for converting single-phase alternating current into direct current and outputting the direct current through the second output end;

The error wiring switch control module is used for controlling the wiring state of the error wiring switch module according to the action of a user, so as to control the wiring state between the power supply module and the electric energy meter.

According to the technical scheme, the power module can convert a single-phase power supply into three-phase voltage and current which can be connected into the electric energy meter and direct current which is used for supplying power for the error wiring switch control module, the current module transmits the regulated three-phase voltage and current to the terminal block, the output end of the terminal block transmits a current and voltage signal to the error wiring switch module, and the current and voltage signal is transmitted to the error wiring switch module and is electrically connected with the electric energy meter through the junction box. The wiring state of the error wiring switch module can be changed through the error wiring switch control module, so that the wiring state between the power supply module and the electric energy meter is changed, namely, the wiring condition of the metering secondary circuit is changed. The technical scheme of the embodiment can meet the training requirements on different wiring conditions of the metering secondary circuit so as to improve the skill level and professional quality of electric energy metering operation and maintenance personnel.

It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a wiring training device for an electric energy metering secondary circuit according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a power module control circuit according to a first embodiment of the present invention;

fig. 3 is a schematic structural diagram of a power module main circuit according to a first embodiment of the present invention;

FIG. 4 is a schematic diagram of a voltage miswiring main circuit according to a first embodiment of the present invention;

FIG. 5 is a schematic diagram of a voltage miswiring control circuit according to a first embodiment of the present invention;

FIG. 6 is a schematic diagram of a current miswiring main circuit according to a first embodiment of the present invention;

FIG. 7 is a schematic diagram of a current miswiring control circuit according to a first embodiment of the present invention;

fig. 8 is a schematic structural diagram of an auxiliary circuit according to a first embodiment of the present invention;

Fig. 9 is a schematic structural view of a middle deck panel according to a second embodiment of the present invention;

fig. 10 is a schematic structural diagram of a skin panel according to a second embodiment of the present invention;

FIG. 11 is a diagram showing a connection mode between a voltmeter and a junction box according to a second embodiment of the present invention;

FIG. 12 is a flowchart of the operation of the secondary loop wiring training device for power metering in the non-live mode according to the second embodiment of the present invention;

FIG. 13 is a flow chart of a live mode operation of another power metering secondary loop wiring training device provided in accordance with a second embodiment of the present invention.

Detailed Description

In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Examples

Fig. 1 is a schematic structural diagram of an electric energy metering secondary circuit wiring training device according to an embodiment of the present invention, and referring to fig. 1, the electric energy metering secondary circuit wiring training device includes:

a power module 110, a terminal block 120, a miswiring switch control module 130, a miswiring switch module 140, a junction box 150, and an electric energy meter 160;

the first output end of the power module 110 is electrically connected with the input end of the terminal block 120, and the input end of the power module 110 is used for accessing single-phase alternating current;

the output end of the terminal block 120 is electrically connected with the input end of the error wiring switch module 140, the output end of the error wiring switch module 140 is electrically connected with the first end of the junction box 150, and the second end of the junction box 150 is electrically connected with the electric energy meter 160;

the output end of the error wiring switch control module 130 is electrically connected with the control end of the error wiring switch module 140, and the power end of the error wiring switch control module is electrically connected with the second output end of the power module 110;

the power module 110 is configured to convert single-phase alternating current into three-phase voltage and current, and output the three-phase voltage and current through the first output terminal; the power module 110 is further configured to convert the single-phase alternating current into direct current and output the direct current through the second output terminal;

The miswiring switch control module 130 is configured to control the wiring state of the miswiring switch module 140 according to the action of the user, thereby controlling the wiring state between the power module 110 and the electric energy meter 160.

The power module 110 may perform ac and dc conversion, and may convert single-phase ac into ac or dc required for operation. The power module 110 may convert the single-phase power into three-phase voltage and current that can be connected to the electric energy meter 160 and direct current that powers the miswire switch control module 130, the current module 110 transmits the adjusted three-phase voltage and current to the terminal block 120, the terminal block 120 is composed of a voltage signal terminal group and a current signal terminal group, and the output end of the terminal block 120 transmits the current-voltage signal to the miswire switch module 140. The miswiring switch control module 130 may include a relay coil, the miswiring switch module 140 may include a relay switch, the miswiring switch control module 130 may further include a push button switch or a knob, and the relay coil may be controlled to be powered through controlling the push button switch or the knob, so as to control the miswiring switch module 140, thereby changing the wiring condition of the metering secondary circuit.

According to the technical scheme of the embodiment, the power module 110 can convert a single-phase power supply into three-phase voltage and current which can be connected to the electric energy meter 160 and direct current which supplies power to the miswiring switch control module 130, the current module 110 transmits the regulated three-phase voltage and current to the terminal block 120, the output end of the terminal block 120 transmits a current and voltage signal to the miswiring switch module 140, and the current and voltage signal is transmitted to the miswiring switch module 140 to be electrically connected with the electric energy meter 160 through the junction box 150. The wiring state of the wrong wiring switch module 140 can be changed by the wrong wiring switch control module 130, so that the wiring state between the power module 110 and the electric energy meter 160, namely, the wiring condition of the metering secondary circuit is changed. The technical scheme of the embodiment can meet the training requirements on different wiring conditions of the metering secondary circuit so as to improve the skill level and professional quality of electric energy metering operation and maintenance personnel.

Optionally, the power module includes a main circuit and a control circuit, fig. 2 is a schematic structural diagram of a power module control circuit provided in the first embodiment of the present invention, and referring to fig. 2, the control circuit includes a first switch K1, a second switch K2, a third switch K3, and a power control relay KY1; the coils of the first switch K1, the second switch K2, the third switch K3 and the power control relay KY1 are sequentially connected in series between a live wire L and a zero wire N of single-phase alternating current, and a first normally open switch KY11 of the power control relay KY1 is connected in parallel with the second switch K2.

Fig. 3 is a schematic structural diagram of a main circuit of a power module according to a first embodiment of the present invention, and referring to fig. 3, the main circuit includes a second normally open switch KY12 of a power control relay KY1, a normally closed switch KM281 of a protection relay KM28, a single-phase ac-to-three-phase ac unit, and an ac-to-dc unit.

The second normally open switch KY12 of the power control relay KY1, the first normally closed switch KM281 of the protection relay KM28 and the single-phase alternating current-to-three-phase alternating current unit are sequentially connected in series, and the static contact of the second normally open switch KY12 of the power control relay KY1 is connected with the live wire L of the single-phase alternating current, and the output end of the single-phase alternating current-to-three-phase alternating current unit is the first output end of the power module.

The first end of the alternating current-to-direct current unit is connected with the zero line N, the second end of the alternating current-to-direct current unit is connected with the live wire L, and the first output end and the second output end of the alternating current-to-direct current unit are respectively and electrically connected with the first power end and the second power end of the error wiring switch control module.

The first output end of the power supply module comprises a voltage signal end and a current signal end. The first switch K1, the second switch K2 and the third switch K3 in the control circuit can be boat-shaped switches, the first switch K1 is a total switch of the whole device, the second switch K2 is a metering secondary circuit power-on switch, and the third switch K3 is a metering secondary circuit power-off switch. The power control relay KY1 is an alternating current relay and is provided with 3 groups of contact pairs. Pressing the first switch K1, and providing a control power supply for the error wiring switch module by the alternating current-to-direct current unit; pressing a second switch K2, closing a second normally open switch KY12 of a power supply control relay KY1, and supplying power to a metering secondary circuit by a single-phase alternating current-to-three-phase alternating current unit; and pressing the third switch K3 to disconnect the metering secondary loop power supply. The first normally closed switch KM281 of the protection relay KM28 is used for power-on blocking under the condition of phase-to-phase short circuit or open wiring error point of the grounding and current loop, so as to protect the training device.

Optionally, the miswiring switch module includes a voltage phase sequence error circuit, a voltage phase-to-phase short circuit and a voltage loop grounding circuit, and the miswiring switch control module includes a voltage phase sequence error control circuit, a voltage phase-to-phase short circuit control circuit and a voltage loop grounding control circuit.

Fig. 4 is a schematic structural diagram of a voltage error connection main circuit provided in the first embodiment of the present invention, referring to fig. 4, the voltage phase sequence error circuit includes three normally open switches of a first relay KM1, three normally open switches of a second relay KM2, three normally open switches of a third relay KM3, three normally open switches of a fourth relay KM4, three normally open switches of a fifth relay KM5, and three normally open switches of a sixth relay KM 6; the fixed contacts of the three normally open switches of the first relay KM1, the fixed contacts of the three normally open switches of the second relay KM2, the fixed contacts of the three normally open switches of the third relay KM3, the fixed contacts of the three normally open switches of the fourth relay KM4, the fixed contacts of the three normally open switches of the fifth relay KM5 and the fixed contacts of the three normally open switches of the sixth relay KM6 are respectively and electrically connected with the three-phase voltage output end of the terminal block, and the normally open contacts of the three normally open switches of the first relay KM1, the normally open contacts of the third relay KM2, the normally open contacts of the three normally open switches of the third relay KM3, the normally open contacts of the third normally open switch of the fourth relay KM4, the normally open contacts of the three normally open switches of the fifth relay KM5 and the normally open contacts of the three normally open switches of the sixth relay KM6 are respectively and electrically connected with the three-phase voltage input end of the junction box; and the connection correspondence relationship among the normally open contacts of the three normally open switches of the first relay KM1, the normally open contacts of the three normally open switches of the second relay KM2, the normally open contacts of the three normally open switches of the third relay KM3, the normally open contacts of the three normally open switches of the fourth relay KM4, the normally open contacts of the three normally open switches of the fifth relay KM5 and the normally open contacts of the three normally open switches of the sixth relay KM6 and the three-phase voltage input end of the junction box is different.

Fig. 5 is a schematic structural diagram of a voltage miswiring control circuit according to a first embodiment of the present invention, referring to fig. 5, the voltage phase sequence miswiring control circuit includes a first rotary switch RB1, a selection end of the first rotary switch RB1 is electrically connected to a first power supply end of a miswiring switch control module, a first end of the first rotary switch RB1 is electrically connected to a first end of a coil of a first relay KM1, and a second end of the coil of the first relay KM1 is electrically connected to a second power supply end of the miswiring switch control module;

the second end of the first rotary switch RB1 is electrically connected with the first end of a coil of the second relay KM2, and the second end of the coil of the second relay KM2 is electrically connected with a second power supply end;

the third end of the first rotary switch RB1 is electrically connected with the first end of a coil of the third relay KM3, and the second end of the coil of the third relay KM3 is electrically connected with the second power end;

the fourth end of the first rotary switch RB1 is electrically connected with the first end of a fourth relay KM4 coil, and the second end of the fourth relay KM4 coil is electrically connected with a second power supply end;

the fifth end of the first rotary switch RB1 is electrically connected with the first end of a coil of a fifth relay KM5, and the second end of the coil of the fifth relay KM5 is electrically connected with a second power supply end;

The sixth end of the first rotary switch RB1 is electrically connected with the first end of a coil of the sixth relay KM6, and the second end of the coil of the sixth relay KM6 is electrically connected with the second power end.

Referring to fig. 4, the voltage-phase short circuit includes a seventh relay KM7 first normally open switch KM71, an eighth relay KM8 first normally open switch KM81, and a ninth relay KM9 first normally open switch KM91, the seventh relay KM7 first normally open switch KM71 being connected between the first phase voltage output end UA and the second phase voltage output end UB of the terminal block, the eighth relay KM8 first normally open switch KM81 being connected between the third phase voltage output end UC and the second phase voltage output end UB of the terminal block, the ninth relay KM9 first normally open switch KM91 being connected between the first phase voltage output end UA and the third phase voltage output end UC of the terminal block.

Referring to fig. 5, the voltage inter-phase short circuit control circuit includes a first control branch, a second control branch, and a third control branch, wherein an input end of the first control branch, the second control branch, and the third control branch after being connected in parallel is electrically connected with a normally closed contact of a first normally closed switch KY13 of a power control relay KY1, an output end of the first control branch after being connected in parallel is electrically connected with a second power supply end, and a stationary contact of the first normally closed switch KY13 of the power control relay KY1 is electrically connected with the first power supply end;

The first control branch comprises a first lockable button S1 and a seventh relay KM7 coil which are connected in series, the second control branch comprises a second lockable button S2 and an eighth relay KM8 coil which are connected in series, and the third control branch comprises a third lockable button S3 and a ninth relay KM9 coil which are connected in series.

Referring to fig. 4, the voltage loop grounding circuit includes a tenth relay KM10 first normally open switch KM101, an eleventh relay KM11 first normally open switch KM111, and a twelfth relay KM12 first normally open switch KM121; a fixed contact of a first normally open switch KM101 of the tenth relay KM10 is electrically connected with a first phase voltage output end UA of the terminal block, and the normally open contact is grounded; the fixed contact of the first normally open switch KM111 of the eleventh relay KM11 is electrically connected with the second phase voltage output end UB of the terminal block, and the normally open contact is grounded; the stationary contact of the first normally open switch KM121 of the twelfth relay KM12 is electrically connected with the third phase voltage output end UC of the terminal strip, and the normally open contact is grounded.

Referring to fig. 5, the voltage loop grounding control circuit includes a fourth control branch, a fifth control branch and a sixth control branch, an input end of the fourth control branch, the fifth control branch and the sixth control branch after being connected in parallel is electrically connected with a normally closed contact of a first normally closed switch KY13 of a power control relay KY1, and an output end of the fourth control branch, the fifth control branch and the sixth control branch after being connected in parallel is electrically connected with a second power end;

The fourth control branch comprises a fourth lockable button S4 and a tenth relay KM10 coil connected in series, the fifth control branch comprises a fifth lockable button S5 and an eleventh relay KM11 coil connected in series, and the sixth control branch comprises a sixth lockable button S6 and a twelfth relay KM12 coil connected in series.

The first power end is the positive electrode of the relay power supply, and the second power end is the negative electrode of the relay power supply. In the phase sequence error control circuit, the direct current relays KM1, KM2, KM3, KM4, KM5 and KM1 are provided with 3 groups of contact pairs (namely, three normally open switches are provided), the first rotary switch RB1 is provided with six gears, and the six gears of the first rotary switch RB1 respectively correspond to ABC, BCA, CAB, CBA, BAC, ACB voltage phase sequences. The interphase short-circuit control circuits S1, S2 and S3 are all single-pole single-throw lockable buttons (hold-down). And S4, S5 and S6 in the loop grounding control circuit are single-pole single-throw lockable buttons (hold down). The power supply control relay KY1 is an alternating current relay, and the first normally closed switch KY13 of the power supply control relay KY1 is used for powering on and locking so as to protect the training device.

Optionally, referring to fig. 4, the miswiring switch control module further includes a voltage loop open circuit and a voltage loop drop circuit, and the miswiring switch module further includes a voltage loop open circuit control circuit and a voltage loop drop out control circuit.

The voltage loop open circuit comprises a first passage of a seventh double-knife lockable button S7, a first passage of an eighth double-knife lockable button S8, a first passage of a ninth double-knife lockable button S9 and a first passage of a tenth double-knife lockable button S10; the circuit voltage drop sub-circuit includes a first path of the eleventh two-blade lockable button S11, a first path of the twelfth two-blade lockable button S12, a first path of the thirteenth two-blade lockable button S13, a first resistor R1, a second resistor R2, and a third resistor R3.

The first end of the first passage of the seventh double-knife lockable button S7 is electrically connected to the first phase voltage output end UA of the terminal block, and the second end is electrically connected to the first end of the first passage of the eleventh double-knife lockable button S11; the second end of the first path of the eleventh double-knife lockable button S11 is electrically connected to the phase sequence error sub-circuit, the third end is electrically connected to the first end of the first resistor R1, and the second end of the first resistor R1 is electrically connected to the second end of the first path of the eleventh double-knife lockable button S11.

The first end of the first passage of the eighth double-knife lockable button S8 is electrically connected with the second phase voltage output end UB of the terminal row, and the second end is electrically connected with the first end of the first passage of the twelfth double-knife lockable button S12; the second end of the first path of the twelfth double-blade lockable button S12 is electrically connected to the phase sequence error sub-circuit, the third end is electrically connected to the first end of the second resistor R2, and the second end R2 of the second resistor is electrically connected to the second end of the first path of the twelfth double-blade lockable button S12.

The first end of the first passage of the ninth double-blade lockable button S9 is electrically connected with the third phase voltage output end UC of the terminal block, and the second end is electrically connected with the first end of the first passage of the thirteenth double-blade lockable button S13; the second end of the first path of the thirteenth double-knife lockable button S13 is electrically connected to the phase sequence error sub-circuit, the third end is electrically connected to the first end of the third resistor R3, and the second end of the third resistor R3 is electrically connected to the second end of the first path of the thirteenth double-knife lockable button S13.

The first end of the first passage of the tenth double-knife lockable button S10 is electrically connected to the voltage zero line output end UN of the terminal block, and the second end is electrically connected to the voltage zero line input end of the junction box.

Referring to fig. 5, the voltage loop open-circuit control circuit includes a second path of a seventh double-blade lockable button S7, a second path of an eighth double-blade lockable button S8, a second path of a ninth double-blade lockable button S9, and a second path of a tenth lockable button S10, an input end of the parallel connection of the second path of the seventh lockable button S7, the second path of the eighth lockable button S8, the second path of the ninth lockable button S9, and the second path of the tenth lockable button S10 is electrically connected with the first power supply terminal, and an output end of the parallel connection is electrically connected with the second power supply terminal.

The voltage loop voltage drop out-of-tolerance control circuit comprises a second passage of an eleventh double-knife lockable button S11, a second passage of a twelfth double-knife lockable button S12 and a second passage of a thirteenth double-knife lockable button S13, wherein an input end of the parallel connection of the second passage of the eleventh double-knife lockable button S11, the second passage of the twelfth double-knife lockable button S12 and the second passage of the thirteenth double-knife lockable button S13 is electrically connected with a first power end, and an output end of the parallel connection is electrically connected with a second power end.

The first power end is the positive electrode of the relay power supply, and the second power end is the negative electrode of the relay power supply. The loop open control circuit includes double pole double throw lockable buttons (hold down) S7, S8, S9, S10. The circuit drop control circuit also includes double pole double throw lockable buttons (hold down) S11, S12, S13.

Optionally, referring to fig. 5, each relay coil in the voltage phase sequence error control circuit, the voltage phase-to-phase short circuit control circuit and the voltage loop grounding control circuit is connected in parallel with an indicator lamp;

each button in the voltage loop open control circuit and the voltage loop drop control circuit is connected in series with an indicator light.

Wherein KM1 coil is connected in parallel with LED1, KM2 coil is connected in parallel with LED2, KM3 coil is connected in parallel with LED3, KM4 coil is connected in parallel with LED4, KM5 coil is connected in parallel with LED5, KM6 coil is connected in parallel with LED6, KM7 coil is connected in parallel with LED7, KM8 coil is connected in parallel with LED8, KM9 coil is connected in parallel with LED9, KM10 coil is connected in parallel with LED10, KM11 coil is connected in parallel with LED11, KM12 coil is connected in parallel with LED12, seventh two-blade lockable button S7 is connected in series with LED13, eighth two-blade lockable button S8 is connected in series with LED14, ninth two-blade lockable button S9 is connected in series with LED15, tenth two-blade lockable button S10 is connected in series with LED16, eleventh two-blade lockable button S11 is connected in series with LED17, twelfth two-blade lockable button S12 is connected in series with LED18, thirteenth two-blade lockable button S13 is connected in series with LED 19. The LEDs 7-19 can be independent indicator lamps or indicator lamps embedded in the lockable buttons S1-S13, and the function of the indicator lamps is to display the state of the switch.

Specifically, a first knob switch RB1 of the phase sequence error control circuit is rotated to 1 grade, only a KM1 coil is electrified, an LED1 is on, three normally open switches of a voltage error wiring main circuit KM1 are closed, and three normally open switches of KM2-KM6 are opened; the three-phase voltage output ends UA/UB/UC in the terminal row are respectively and sequentially electrically connected with the three-phase voltage input ends of the junction box through three normally open switches KM1, the voltage wiring phase sequence is ABC at the moment, KM2-KM6 gears are pushed in the same way, each gear of KM2-KM6 corresponds to one voltage wiring phase sequence, and simulation of different voltage phase sequence errors is realized. When a KY1 coil in the power supply module control circuit is not electrified, namely a metering secondary circuit power supply is disconnected, a first normally closed switch KY13 of a power supply control relay KY1 is closed, a button S1 of an interphase short circuit control circuit is pressed down, a KM7 coil is electrified, an LED7 is on, a voltage error wiring main circuit KM7 a first normally open switch KM71 is closed, and a first phase voltage and a second phase voltage are short-circuited; the push of buttons S2-S6 and so on. When the coil of the power supply control relay KY1 in the power supply module control circuit is electrified, the first normally closed switch KY13 of the power supply control relay KY1 is disconnected, and at the moment, the button S1 of the interphase short circuit control circuit is pressed, the coil of the KM7 is not electrified, and then the first normally open switch KM71 of the voltage error wiring main circuit is disconnected. The push of buttons S2-S6 and so on.

When the seventh double-knife lockable button S7 of the loop open control circuit is pressed and the LED13 is on, the first path of the seventh double-knife lockable button S7 of the voltage error wiring main circuit is switched from closed to open, the loop is open, and the first phase voltage is open. The push of buttons S8-S10 and so on.

When the eleventh double-pole double-throw button S11 of the loop voltage drop control circuit is pressed and the LED17 is on, the position of a first path switch of the eleventh double-pole double-throw button S11 of the voltage error wiring main circuit is changed from top to bottom, the loop is connected with the resistor R1, and the loop voltage drop is changed. The push of buttons S12-S13 and so on. By simulating voltage miswiring conditions such as voltage phase sequence errors, voltage phase-to-phase short circuits, voltage loop grounding, voltage loop open circuits, voltage loop voltage drop out-of-tolerance and the like, the requirements of basic miswiring and complex miswiring training can be met at the same time, and the skill level and professional quality of electric energy metering operation and maintenance personnel are improved.

Optionally, the miswiring switch control module further includes a current phase sequence error control circuit, a current phase-to-phase short circuit control circuit, and a current loop ground control circuit, and the miswiring switch module further includes a current phase sequence error circuit, a current phase-to-phase short circuit, and a current loop ground circuit.

Fig. 6 is a schematic structural diagram of a current miswiring main circuit according to a first embodiment of the present invention, and referring to fig. 6, the current phase sequence error circuit includes three normally open switches of a thirteenth relay KM13, three normally open switches of a fourteenth relay KM14, three normally open switches of a fifteenth relay KM15, three normally open switches of a sixteenth relay KM16, three normally open switches of a seventeenth relay KM17, and three normally open switches of an eighteenth relay KM 18; the fixed contacts of the three normally open switches of the thirteenth relay KM13, the fixed contacts of the three normally open switches of the fourteenth relay KM14, the fixed contacts of the three normally open switches of the fifteenth relay KM15, the fixed contacts of the three normally open switches of the sixteenth relay KM16, the fixed contacts of the three normally open switches of the seventeenth relay KM17 and the fixed contacts of the three normally open switches of the eighteenth relay KM18 are respectively and electrically connected with the three-phase current output end of the terminal block, and the normally open contacts of the three normally open switches of the thirteenth relay KM13, the normally open contacts of the three normally open switches of the fourteenth relay KM14, the normally open contacts of the three normally open switches of the fifteenth relay KM15, the normally open contacts of the three normally open switches of the seventeenth relay KM17 and the normally open contacts of the three normally open switches of the eighteenth relay KM18 are respectively and electrically connected with the three-phase current input end of the junction box; and the connection correspondence relationship among the static contacts of the three normally open switches of the thirteenth relay KM13, the static contacts of the three normally open switches of the fourteenth relay KM14, the static contacts of the three normally open switches of the fifteenth relay KM15, the static contacts of the three normally open switches of the sixteenth relay KM16, the static contacts of the three normally open switches of the seventeenth relay KM17 and the static contacts of the three normally open switches of the eighteenth relay KM18 and the three-phase current input end of the junction box is different.

Fig. 7 is a schematic structural diagram of a current miswiring control circuit according to a first embodiment of the present invention, referring to fig. 7, the current phase sequence miswiring control circuit includes a second rotary switch RB2, a selection end of the second rotary switch RB2 is electrically connected to a first power end of the miswiring switch control module, a first end of the second rotary switch RB2 is electrically connected to a first end of a thirteenth relay KM13 coil, and a second end of the thirteenth relay KM13 coil is electrically connected to a second power end of the miswiring switch control module.

The second end of the second rotary switch RB2 is electrically connected with the first end of a coil of a fourteenth relay KM14, and the second end of the coil of the fourteenth relay KM14 is electrically connected with a second power supply end;

the third end of the second knob switch RB2 is electrically connected with the first end of a fifteenth relay KM15 coil, and the second end of the fifteenth relay KM15 coil is electrically connected with a second power supply end;

the fourth end of the second knob switch RB2 is electrically connected with the first end of a coil of a sixteenth relay KM16, and the second end of the coil of the sixteenth relay KM16 is electrically connected with a second power supply end;

the fifth end of the second rotary switch RB2 is electrically connected with the first end of a seventeenth relay KM17 coil, and the second end of the seventeenth relay KM17 coil is electrically connected with a second power supply end;

The sixth end of the second rotary switch RB2 is electrically connected with the first end of the coil of the eighteenth relay KM18, and the second end of the coil of the eighteenth relay KM18 is electrically connected with the second power end.

Referring to fig. 6, the current phase-to-phase short circuit includes a first path of a fourteenth double-blade lockable button S14, a first path of a fifteenth double-blade lockable button S15, and a first path of a sixteenth double-blade lockable button S16, the first path of the fourteenth double-blade lockable button S14 being connected between the first phase current output terminal ia+ and the second phase current output terminal ib+ of the terminal block, the first path of the fifteenth double-blade lockable button S15 being connected between the second phase current output terminal ib+ and the third phase current output terminal ic+ of the terminal block, and the first path of the sixteenth double-blade lockable button S16 being connected between the first phase current output terminal ia+ and the third phase current output terminal ic+ of the terminal block.

Referring to fig. 7, the current interphase short-circuit control circuit includes a second passage of a fourteenth double-bladed lockable button S14, a second passage of a fifteenth double-bladed lockable button S15, and a second passage of a sixteenth double-bladed lockable button S16, the second passage of the fourteenth double-bladed lockable button S14, the second passage of the fifteenth double-bladed lockable button S15, and the second passage of the sixteenth double-bladed lockable button S16 being connected in parallel between the first power supply terminal and the second power supply terminal.

Referring to fig. 6, the current loop ground circuit includes a first path of a seventeenth double-blade lockable button S17, a first path of an eighteenth double-blade lockable button S18, and a first path of a nineteenth double-blade lockable button S19, the first end of the first path of the seventeenth double-blade lockable button S17 being connected to the first phase current output terminal ia+ of the terminal block, the first end of the first path of the eighteenth double-blade lockable button S18 being connected to the second phase current output terminal ib+ of the terminal block, the first end of the first path of the nineteenth double-blade lockable button S19 being connected to the third phase current output terminal ic+ of the terminal block, the second end of the first path of the seventeenth double-blade lockable button S17, the second end of the first path of the eighteenth double-blade lockable button S18, and the second end of the first path of the nineteenth double-blade lockable button S19 being grounded.

Referring to fig. 7, the current loop ground control circuit includes a second passage of a seventeenth double-bladed lockable button S17, a second passage of an eighteenth double-bladed lockable button S18, and a second passage of a nineteenth double-bladed lockable button S19, the second passage of the seventeenth double-bladed lockable button S17, the second passage of the eighteenth double-bladed lockable button S18, and the second passage of the nineteenth double-bladed lockable button S19 being connected in parallel between the first power supply terminal and the second power supply terminal.

The first power end is the positive electrode of the relay power supply, and the second power end is the negative electrode of the relay power supply. In the phase sequence error control circuit, 3 groups of contact pairs (namely three normally open switches) are arranged on the direct current relays KM13, KM14, KM15, KM16, KM17 and KM18, the second rotary switch RB2 has six gear positions, and the six gear positions of the second rotary switch RB2 correspond to ABC, BCA, CAB, CBA, BAC, ACB current phase sequences respectively. In the interphase short circuit control circuit, S14, S15 and S16 are double-pole double-throw lockable buttons (hold down). In the loop grounding control circuit, S17, S18 and S19 are double-pole double-throw lockable buttons (hold down).

Optionally, the miswiring switch control module further comprises a current loop open circuit control circuit and a current polarity error control circuit, and the miswiring switch module further comprises a current loop open circuit and a current polarity error circuit.

Referring to fig. 6, the current loop open circuit includes a nineteenth relay KM19 normally closed switch, a twentieth relay KM20 normally closed switch, and a twenty-first relay KM21 normally closed switch, a twenty-first relay KM22 normally closed switch, a twenty-first relay KM23 normally closed switch, and a twenty-first relay KM24 normally closed switch;

The current polarity error circuit includes a first normally-closed switch KM251 and a second normally-closed switch KM252 of a twenty-five relay KM25, a first normally-closed switch KM261 and a second normally-closed switch KM262 of a twenty-sixteen relay KM26, and a first normally-closed switch KM271 and a second normally-closed switch KM272 of a twenty-seven relay KM 27.

The fixed contact of the normally closed switch of the nineteenth relay KM19 is electrically connected with the first phase current output end IA+ of the terminal block, and the normally closed contact is electrically connected with the normally closed contact of the first normally closed switch KM251 of the twenty-fifth relay KM25 and the normally open contact of the second normally closed switch KM252 of the twenty-fifth relay; the fixed contact of the normally closed switch of the twenty-fifth relay KM20 is electrically connected with the first phase current input end IA-of the terminal block, and the normally closed contact of the normally closed switch KM251 of the twenty-fifth relay KM25 and the normally closed contact of the normally closed switch KM252 of the twenty-fifth relay KM25 are electrically connected; the fixed contact of a first normally closed switch KM251 of the twenty-five relay KM25 is electrically connected with a current phase sequence error circuit, and the fixed contact of a second normally closed switch KM252 of the twenty-five relay KM25 is electrically connected with the output end of a first phase circuit of the junction box;

the stationary contact of the twenty-first relay KM21 normally-closed switch is electrically connected with a second phase current output end IB+ of the terminal strip, and the normally-closed contact is electrically connected with the normally-closed contact of a first normally-closed switch KM261 of a twenty-sixth relay KM26 and a normally-open contact of a second normally-closed switch KM262 of the twenty-sixth relay KM 26; the fixed contact of the normally closed switch of the twenty-second relay KM22 is electrically connected with the second phase current input end IB-of the terminal strip, and the normally closed contact is electrically connected with the normally open contact of the first normally closed switch KM261 of the twenty-sixth relay KM26 and the normally closed contact of the second normally closed switch KM262 of the twenty-sixth relay KM 26; the stationary contact of the first normally closed switch KM261 of the twenty-first relay KM26 is electrically connected with the current phase sequence error circuit, and the stationary contact of the second normally closed switch KM262 of the twenty-first relay KM26 is electrically connected with the second phase circuit output terminal of the junction box.

The fixed contact of the normally closed switch of the twenty-third relay KM23 is electrically connected with a third phase current output end IC+ of the terminal block, and the normally closed contact is electrically connected with the normally closed contact of the first normally closed switch KM271 of the twenty-seventh relay KM27 and the normally open contact of the second normally closed switch KM272 of the twenty-seventh relay KM 27; the fixed contact of the normally closed switch of the twenty-fourth relay KM24 is electrically connected with the third phase current input end IC-of the terminal block, and the normally closed contact is electrically connected with the normally open contact of the first normally closed switch KM271 of the twenty-seventh relay KM27 and the normally closed contact of the second normally closed switch KM272 of the twenty-seventh relay KM 27; the stationary contact of the first normally closed switch KM271 of the second seventeenth relay KM27 is electrically connected to the current phase sequence error circuit, and the stationary contact of the second normally closed switch KM272 of the second seventeenth relay KM27 is electrically connected to the third phase circuit output terminal of the junction box.

Referring to fig. 7, the current loop open-circuit control circuit includes a seventh control branch, an eighth control branch, a ninth control branch, a tenth control branch, an eleventh control branch, and a twelfth control branch, and input ends of the seventh control branch, the eighth control branch, the ninth control branch, the tenth control branch, the eleventh control branch, and the twelfth control branch after being connected in parallel are electrically connected with normally closed contacts of a second normally closed switch KY14 of the power control relay KY1, and output ends of the seventh control branch, the eighth control branch, the ninth control branch, the tenth control branch, the eleventh control branch, and the twelfth control branch after being connected in parallel are electrically connected with a second power supply end; the stationary contact of the second normally closed switch KY14 of the power supply control relay KY1 is electrically connected with the first power supply terminal.

The seventh control branch comprises a twenty-eighth lockable button S20 and a nineteenth relay KM19 coil which are connected in series, the eighth control branch comprises a twenty-first lockable button S21 and a twenty-first relay KM20 coil which are connected in series, and the ninth control branch comprises a twenty-second lockable button S22 and a twenty-first relay KM21 coil which are connected in series; the tenth control branch comprises a thirteenth lockable button K23 and a twenty-second relay KM22 coil which are connected in series; the eleventh control branch comprises a twenty-fourth lockable button S24 and a twenty-third relay KM23 coil which are connected in series; the twelfth control branch includes a twenty-fifth lockable button S25 and a twenty-fourth relay KM24 coil connected in series.

The current polarity error control circuit current loop open circuit control circuit comprises a thirteenth control branch circuit, a fourteenth control branch circuit and a fifteenth control branch circuit, wherein the input ends of the thirteenth control branch circuit, the fourteenth control branch circuit and the fifteenth control branch circuit after being connected in parallel are electrically connected with the first power supply end, and the output ends of the thirteenth control branch circuit, the fourteenth control branch circuit and the fifteenth control branch circuit after being connected in parallel are electrically connected with the second power supply end.

The fourteenth control branch includes a twenty-eighth lockable button S26 and a twenty-fifth relay KM25 coil connected in series, the fifteenth control branch includes a twenty-seventh lockable button S27 and a twenty-seventh relay KM26 coil connected in series, and the sixteenth control branch includes a twenty-eighth lockable button S28 and a twenty-seventh relay KM27 coil connected in series.

The S20, S21, S22, S23, S24 and S25 single-pole single-throw lockable buttons (pressing and holding) of the loop open control circuit and the second normally closed switch KY14 of the power control relay KY1 serve as power-on locking to protect the training device. The polarity error control circuits S26, S27, S28 are all single pole single throw lockable buttons (hold down).

Optionally, each relay coil in the current phase sequence error control circuit, the current loop open-circuit control circuit and the current polarity error control circuit is connected in parallel with an indicator lamp;

each button in the current phase-to-phase short circuit control circuit and the current loop grounding control circuit is connected with an indicator lamp in series.

Wherein KM13 coil is connected in parallel with LED20, KM14 coil is connected in parallel with LED21, KM15 coil is connected in parallel with LED22, KM16 coil is connected in parallel with LED23, KM17 coil is connected in parallel with LED24, KM18 coil is connected in parallel with LED25, fourteenth double-blade lockable button S14 is connected in series with LED26, fifteenth double-blade lockable button S15 is connected in series with LED27, sixteenth double-blade lockable button S16 is connected in series with LED28, seventeenth double-blade lockable button S17 is connected in series with LED29, eighteenth double-blade lockable button S18 is connected in series with LED30, nineteenth double-blade lockable button S19 is connected in series with LED31, KM19 coil is connected in parallel with LED32, KM20 coil is connected in parallel with LED33, KM21 coil is connected in parallel with LED34, KM22 coil is connected in parallel with LED35, KM23 coil is connected in parallel with LED36, KM24 coil is connected in parallel with LED37, KM25 coil is connected in parallel with LED38, KM26 coil is connected in parallel with LED39, and 27 is connected in parallel with LED 40. The LEDs 26-40 may be independent indicator lights or indicator lights embedded in the lockable buttons S14-S28, which serve to display the status of the switch.

Specifically, the second knob switch RB2 of the phase sequence error control circuit is rotated to 1 grade, only the KM13 coil is electrified, the LED20 is on, three normally open switches of the voltage error wiring main circuit KM13 are closed, and three normally open switches of KM13-KM18 are opened; KM13-KM18 and so on. When the fourteenth double-blade lockable button S14 of the interphase short-circuit control circuit is pressed and the LED26 is on, the first path of the fourteenth double-blade lockable button S14 of the current miswiring main circuit is closed, and a short circuit is generated between the first phase current and the second phase current. The push of buttons S15-S19 and so on.

When a KY1 coil in the power supply module control circuit is not electrified, namely a metering secondary circuit power supply is disconnected, a power supply control relay KY1 second normally closed switch KY14 is closed, a button S20 of the loop open control circuit is pressed down, a KM19 coil is electrified, an LED32 is on, a normally closed switch of a current error wiring main circuit KM19 is disconnected, a loop is opened, and a first phase current is opened; the push of buttons S21-S25 and so on. When the coil KY1 in the power module control circuit is electrified, the second normally-closed switch KY14 of the power control relay KY1 is opened, and at the moment, the button S21 of the loop open control circuit is pressed, the coil KM19 is not electrified, and then the normally-closed contact of the voltage error wiring main circuit KM19 is closed. The push of buttons S21-S25 and so on.

When a single-pole single-throw button S26 of the polarity error control circuit is pressed, a KM25 coil is electrified, and an LED38 is on, a normally-closed contact of a first normally-closed switch KM251 of the KM25 of the current error wiring main circuit is turned to a normally-open contact, and a normally-closed contact of a second normally-closed switch KM252 of the KM25 is turned to a normally-open contact, so that current reverse polarity is realized. The push of buttons S27-S28 and so on. By simulating current miswiring conditions such as current phase sequence errors, current phase-to-phase short circuits, current loop grounding, current loop opening, current polarity errors and the like, the training requirements of basic miswiring and complex miswiring can be met at the same time, and the skill level and professional quality of electric energy metering operation and maintenance personnel are improved.

FIG. 8 is a schematic diagram of an auxiliary circuit according to a first embodiment of the present invention, and optionally, the miswiring switch control module further includes an auxiliary circuit;

the auxiliary circuit comprises a seventh relay KM7 second normally open switch KM72, an eighth relay KM8 second normally open switch KM82, a ninth relay KM9 second normally open switch KM92, a tenth relay KM10 second normally open switch KM102, an eleventh relay KM11 second normally open switch KM112, a twelfth relay KM12 second normally open switch KM122, a nineteenth relay KM19 normally open switch, a twenty-second relay KM20 normally open switch, a twenty-first relay KM21 normally open switch, a twenty-second relay KM22 normally open switch, a twenty-third relay KM23 normally open switch, a twenty-fourth relay KM24 normally open switch, a twenty-first relay KM25 normally open switch, a twenty-first relay KM26 normally open switch, a twenty-first seventeenth relay KM27 normally open switch, a second normally closed switch 282 of a protection relay KM28, a protection relay KM28 coil, a first indicator LED41 and a second indicator LED42;

The input ends of the seventh relay KM7, the eighth relay KM8, the ninth relay KM9, the tenth relay KM10, the tenth relay KM102, the eleventh relay KM11, the twelfth relay KM12, the twelfth relay KM122, the nineteenth relay KM19, the twenty-first relay KM20, the twenty-first relay KM21, the twenty-first relay KM22, the twenty-first relay KM23, the twenty-first relay KM24, the twenty-first relay KM25, the twenty-first relay KM26 and the twenty-first relay KM27 are connected in parallel, and the output end of the connected in parallel is connected with the first end of the coil of the protection relay KM 28;

a fixed contact of a second normally-closed switch KM282 of the protective relay KM28 is electrically connected with the first power end, a normally-closed contact is electrically connected with the first end of the second indicator light LED42, and a normally-open contact is electrically connected with the first end of the first indicator light LED 41; the second end of the coil of the protection relay KM28, the second end of the first indicator LED41 and the second end of the second indicator LED42 are all electrically connected to the second power supply terminal.

The auxiliary circuit comprises normally open switches of direct current relays KM72-KM122 and KM19-KM27, a coil of a protection relay KM28, a pair of contacts of the protection relay KM28, and indication lamps LED41 and LED42, wherein the LED41 and the LED42 are independent indication lamps and are used for indicating whether a metering secondary circuit can be electrified or not, and the LED41 is electrified in a green light mode, the LED41 is electrified in a red light mode, the LED42 is electrified in a green light mode, and the LED42 is electrified in a red light mode. The power-on condition of the coil of the protection relay KM28 is that the direct current relays KM7-KM12 and KM19-KM27 are powered on, namely, as long as the interphase short circuit of a voltage loop, the grounding of the voltage loop and the open-circuit of a current loop exist, the coil of the KM28 is powered on, the LED41 lights a red light, and meanwhile, a second normally closed switch KM282 of the KM28 in a main circuit of the power module is disconnected, the secondary loop is metered to be electrified and blocked, and the device is prevented from being electrified and burnt by misoperation.

Example two

Fig. 9 is a schematic diagram of a middle panel structure provided in a second embodiment of the present invention, where, based on the above embodiment, referring to fig. 9, optionally, each indicator light, button and knob switch of the miswiring switch control module are integrated on the middle panel;

Fig. 10 is a schematic view of a surface panel according to a second embodiment of the present invention, referring to fig. 10, a terminal block, a junction box and an electric energy meter are disposed on the surface panel, the surface panel is provided with a window area, the middle panel corresponds to the window area of the surface panel, and the window area is provided with a movable cover plate;

other devices of the error wiring switch control module, the power supply module and the error wiring switch module are arranged on the bottom panel.

The training device adopts a three-layer structure, and the electric energy meter, the terminal block and the junction box are arranged on the top layer, so that the measurement and the inspection of operators are facilitated; the power module, the wrong wiring switch module and the wrong wiring switch control module are arranged on the bottom layer, the panel of the wrong wiring switch control module is arranged on the middle layer, and the middle layer can be checked by opening the cover plate of the top layer. Under the condition of no electrification, an operator can set a basic error wiring error point through a button or a knob switch in an error wiring switch control module, cover a cover plate after the setting is finished, find the error point and restore the correct wiring through detecting at a terminal strip and a junction box, so that the device meets the electrifying condition; and setting basic and complex error wiring error points in the same way under the condition of electrification, detecting by a power meter display and auxiliary measuring device (phase voltammeter), finding out the error points and recovering to be correct.

Fig. 11 is a diagram of a connection mode between an electric energy meter and a junction box according to a second embodiment of the present invention, referring to fig. 11, a metering secondary circuit flows out from a power module, passes through a terminal block, then passes through an error wiring switch module, and then reaches the junction box. The first phase voltage output end UA is connected with a voltmeter and a junction box between a first phase current output end IA+ and a first phase current input end IA-of the terminal block, the second phase voltage output end UB is connected with the voltmeter and the junction box between a second phase current output end IB+ and a second phase current input end IB-, and the third phase voltage output end UC is connected with the voltmeter and the junction box between a third phase current output end IC+ and a third phase current input end IC-.

The whole device has two training modes, namely a metering secondary circuit non-charging mode and a metering secondary circuit charging mode. Fig. 12 is a flowchart of operation in a non-live mode of the wiring training device for an electric energy metering secondary circuit according to the second embodiment of the present invention, and referring to fig. 12, the operation in the live mode includes:

step 210, the operator turns on the main switch positioned at the upper left corner of the surface panel.

And 220, selecting a basic error wiring point by an operator, opening a cover plate, determining a corresponding button on the middle-layer panel, pressing down, and covering the cover plate.

Step 230, the operator uses a tool (multimeter) to measure at the terminal strip and the junction box, judges the wrong junction point according to the measured data and gives out the result.

Step 240, the operator opens the cover plate, and determines whether the result corresponds to the pressed button.

The metering secondary circuit non-electrification mode is mainly used for training basic error wiring metering secondary circuit inspection, wherein basic error wiring refers to voltage circuit interphase short circuit, voltage circuit grounding, voltage circuit open circuit, current circuit interphase short circuit, current circuit grounding and current circuit open circuit. So that the operator can be satisfied with the most basic wiring error training.

Fig. 13 is an operation flowchart of another wiring training device for an electric energy metering secondary circuit according to the second embodiment of the present invention, and referring to fig. 13, the operation flowchart of the mode includes:

step 310, the operator turns on the main switch positioned at the upper left corner of the surface panel.

Step 320, the operator selects the wrong wiring point, opens the cover plate, determines the corresponding button in the middle panel, rotates to the corresponding position, and covers the cover plate.

And 330, measuring the terminal strip and the junction box by using a tool (a universal meter and a phase voltammeter), judging an error wiring point according to the measured data, and giving a result.

Step 340, the operator opens the cover plate, and determines whether the result corresponds to the pressed button.

The metering secondary circuit charging mode is mainly used for training complex error wiring metering secondary circuit inspection, wherein the complex error wiring refers to voltage phase sequence error, current phase sequence error and current polarity error; but other basic fault connection points than voltage loop interphase shorts, grounds, and current loop opens may be provided as well. So that complex wiring error training by the operator can be satisfied.

According to the technical scheme, when the wrong wiring points are set, three wrong wirings including interphase short circuit of a voltage loop, grounding and open circuit of a current loop are not set, namely, a green light of a power-on indicator lamp is always on, two modes can be carried out together, training in a secondary loop uncharged mode is carried out firstly, and training in an charged mode is further carried out. This training set adopts three layer construction, and electric energy meter, terminal strip, terminal box are arranged in the top layer, and the operating personnel of being convenient for measure and inspect, and power module, wrong wiring switch module and wrong wiring switch control module are arranged in the bottom, and the panel of wrong wiring switch control module is placed in the intermediate level, and the apron on top layer is opened in the intermediate level accessible and is looked over. The device can meet the training requirements of basic miswiring and complex miswiring at the same time so as to improve the skill level and professional quality of electric energy metering operation and maintenance personnel.

It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.

The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims

1. An electric energy measurement secondary circuit wiring training set, characterized in that includes:

the first output end of the power supply module is electrically connected with the input end of the terminal block, and the input end of the power supply module is used for accessing single-phase alternating current;

The output end of the error wiring switch control module is electrically connected with the control end of the error wiring switch module, and the power end of the error wiring switch control module is electrically connected with the second output end of the power module;

the power supply module is used for converting the single-phase alternating current into three-phase voltage and current and outputting the three-phase voltage and current through a first output end; the power supply module is also used for converting single-phase alternating current into direct current and outputting the direct current through the second output end;

the error wiring switch control module is used for controlling the wiring state of the error wiring switch module according to the action of a user, so as to control the wiring state between the power supply module and the electric energy meter;

the power supply module comprises a main circuit and a control circuit;

the control circuit comprises a first switch, a second switch, a third switch and a power supply control relay; the coils of the first switch, the second switch, the third switch and the power control relay are sequentially connected in series between a live wire and a zero wire of single-phase alternating current, and a first normally open switch of the power control relay is connected with the second switch in parallel;

The main circuit comprises a second normally open switch of the power control relay, a normally closed switch of the protection relay, a single-phase alternating current-to-three-phase alternating current unit and an alternating current-to-direct current unit;

the second normally open switch of the power supply control relay, the first normally closed switch of the protection relay and the single-phase alternating current-to-three-phase alternating current unit are sequentially connected in series, a static contact of the second normally open switch of the power supply control relay is connected with a live wire of the single-phase alternating current, and an output end of the single-phase alternating current-to-three-phase alternating current unit is a first output end of the power supply module;

the first end of the alternating current-to-direct current unit is connected with a zero line, the second end of the alternating current-to-direct current unit is connected with a live wire, and the first output end and the second output end of the alternating current-to-direct current unit are respectively and electrically connected with the first power end and the second power end of the error wiring switch control module.

2. The apparatus according to claim 1, wherein:

the error wiring switch module comprises a voltage phase sequence error circuit, a voltage phase-to-phase short circuit and a voltage loop grounding circuit, and the error wiring switch control module comprises a voltage phase sequence error control circuit, a voltage phase-to-phase short circuit control circuit and a voltage loop grounding control circuit;

The voltage phase sequence error circuit comprises three normally open switches of the first relay, three normally open switches of the second relay, three normally open switches of the third relay, three normally open switches of the fourth relay, three normally open switches of the fifth relay and three normally open switches of the sixth relay; the three normally open switches of the first relay, the three normally open switches of the second relay, the three normally open switches of the third relay, the three normally open switches of the fourth relay, the three normally open switches of the fifth relay and the three normally open switches of the sixth relay are respectively and electrically connected with the three-phase voltage output end of the terminal block, and the three normally open switches of the first relay, the three normally open switches of the second relay, the three normally open switches of the third relay, the three normally open switches of the fourth relay, the three normally open switches of the fifth relay and the three normally open switches of the sixth relay are respectively and electrically connected with the three-phase voltage input end of the junction box; the connection corresponding relations of the normally open contacts of the three normally open switches of the first relay, the normally open contacts of the three normally open switches of the second relay, the normally open contacts of the three normally open switches of the third relay, the normally open contacts of the three normally open switches of the fourth relay, the normally open contacts of the three normally open switches of the fifth relay and the normally open contacts of the three normally open switches of the sixth relay and the three-phase voltage input end of the junction box are different;

The voltage phase sequence error control circuit comprises a first knob switch, wherein the selection end of the first knob switch is electrically connected with the first power end of the error wiring switch control module, the first end of the first knob switch is electrically connected with the first end of the first relay coil, and the second end of the first relay coil is electrically connected with the second power end of the error wiring switch control module;

the second end of the first knob switch is electrically connected with the first end of the second relay coil, and the second end of the second relay coil is electrically connected with the second power supply end;

the third end of the first knob switch is electrically connected with the first end of the third relay coil, and the second end of the third relay coil is electrically connected with the second power supply end;

the fourth end of the first knob switch is electrically connected with the first end of the fourth relay coil, and the second end of the fourth relay coil is electrically connected with the second power end;

the fifth end of the first knob switch is electrically connected with the first end of the fifth relay coil, and the second end of the fifth relay coil is electrically connected with the second power supply end;

the sixth end of the first knob switch is electrically connected with the first end of the sixth relay coil, and the second end of the sixth relay coil is electrically connected with the second power supply end;

The voltage interphase short circuit comprises a seventh relay first normally open switch, an eighth relay first normally open switch and a ninth relay first normally open switch, wherein the seventh relay first normally open switch is connected between a first phase voltage output end and a second phase voltage output end of the terminal row, the eighth relay first normally open switch is connected between a third phase voltage output end and a second phase voltage output end of the terminal row, and the ninth relay first normally open switch is connected between the first phase voltage output end and the third phase voltage output end of the terminal row;

the voltage phase-to-phase short circuit control circuit comprises a first control branch, a second control branch and a third control branch, wherein an input end of the first control branch, the second control branch and the third control branch which are connected in parallel is electrically connected with a normally closed contact of a first normally closed switch of the power supply control relay, an output end of the first control branch which is connected in parallel is electrically connected with a second power supply end, and a static contact of the first normally closed switch of the power supply control relay is electrically connected with the first power supply end;

the first control branch comprises a first lockable button and a seventh relay coil which are connected in series, the second control branch comprises a second lockable button and an eighth relay coil which are connected in series, and the third control branch comprises a third lockable button and a ninth relay coil which are connected in series;

The voltage loop grounding circuit comprises a tenth relay first normally open switch, an eleventh relay first normally open switch and a twelfth relay first normally open switch; the fixed contact of the first normally open switch of the tenth relay is electrically connected with the first phase voltage output end of the terminal strip, and the normally open contact is grounded; the fixed contact of the first normally open switch of the eleventh relay is electrically connected with the second phase voltage output end of the terminal strip, and the normally open contact is grounded; a fixed contact of a first normally open switch of the twelfth relay is electrically connected with a third phase voltage output end of the terminal strip, and the normally open contact is grounded;

the voltage loop grounding control circuit comprises a fourth control branch, a fifth control branch and a sixth control branch, wherein the input ends of the fourth control branch, the fifth control branch and the sixth control branch which are connected in parallel are electrically connected with the normally closed contact of the first normally closed switch of the power control relay, and the output ends of the fourth control branch, the fifth control branch and the sixth control branch which are connected in parallel are electrically connected with the second power end;

the fourth control branch includes a fourth lockable button and a tenth relay coil connected in series, the fifth control branch includes a fifth lockable button and an eleventh relay coil connected in series, and the sixth control branch includes a sixth lockable button and a twelfth relay coil connected in series.

3. The apparatus according to claim 2, wherein:

the error wiring switch control module further comprises a voltage loop open circuit and a voltage loop voltage drop circuit, and the error wiring switch module further comprises a voltage loop open circuit control circuit and a voltage loop voltage drop out-of-tolerance control circuit;

the voltage loop open circuit comprises a first passage of a seventh double-knife lockable button, a first passage of an eighth double-knife lockable button, a first passage of a ninth double-knife lockable button and a first passage of a tenth double-knife lockable button; the loop voltage drop sub-circuit comprises a first passage of an eleventh double-knife lockable button, a first passage of a twelfth double-knife lockable button, a first passage of a thirteenth double-knife lockable button, a first resistor, a second resistor and a third resistor;

the first end of the first passage of the seventh double-knife lockable button is electrically connected with the first phase voltage output end of the terminal block, and the second end of the first passage of the eleventh double-knife lockable button is electrically connected with the first end of the first passage of the eleventh double-knife lockable button; the second end of the first passage of the eleventh double-knife lockable button is electrically connected with the phase sequence error sub-circuit, the third end of the first passage is electrically connected with the first end of the first resistor, and the second end of the first resistor is electrically connected with the second end of the first passage of the eleventh double-knife lockable button;

The first end of the first passage of the eighth double-knife lockable button is electrically connected with the second phase voltage output end of the terminal strip, and the second end of the first passage of the eighth double-knife lockable button is electrically connected with the first end of the first passage of the twelfth double-knife lockable button; the second end of the first passage of the twelfth double-knife lockable button is electrically connected with the phase sequence error sub-circuit, the third end of the first passage is electrically connected with the first end of the second resistor, and the second end of the second resistor is electrically connected with the second end of the first passage of the twelfth double-knife lockable button;

the first end of the first passage of the ninth double-blade lockable button is electrically connected with the third phase voltage output end of the terminal block, and the second end of the first passage of the thirteenth double-blade lockable button is electrically connected with the first end of the first passage of the thirteenth double-blade lockable button; the second end of the first passage of the thirteenth double-knife lockable button is electrically connected with the phase sequence error sub-circuit, the third end of the first passage is electrically connected with the first end of the third resistor, and the second end of the third resistor is electrically connected with the second end of the first passage of the thirteenth double-knife lockable button;

the first end of the first passage of the tenth double-knife lockable button is electrically connected with the voltage zero line output end of the terminal block, and the second end of the first passage is electrically connected with the voltage zero line input end of the junction box;

the voltage loop open-circuit control circuit comprises a second passage of a seventh double-knife lockable button, a second passage of an eighth double-knife lockable button, a second passage of a ninth double-knife lockable button and a second passage of a tenth lockable button, wherein an input end of the parallel connection of the second passage of the seventh lockable button, the second passage of the eighth lockable button, the second passage of the ninth lockable button and the second passage of the tenth lockable button is electrically connected with a first power supply end, and an output end of the parallel connection is electrically connected with a negative electrode of a relay power supply;

The voltage loop voltage drop out-of-tolerance control circuit comprises a second passage of an eleventh double-cutter lockable button, a second passage of a twelfth double-cutter lockable button and a second passage of a thirteenth double-cutter lockable button, wherein an input end of the eleventh double-cutter lockable button, the second passage of the twelfth double-cutter lockable button and the second passage of the thirteenth double-cutter lockable button which are connected in parallel is electrically connected with a first power end, and an output end of the thirteenth double-cutter lockable button which is connected in parallel is electrically connected with a second power end.

4. A device according to claim 3, characterized in that:

each relay coil in the voltage phase sequence error control circuit, the voltage interphase short circuit control circuit and the voltage loop grounding control circuit is connected with an indicator lamp in parallel;

5. A device according to claim 3, comprising:

the error wiring switch control module further comprises a current phase sequence error control circuit, a current phase-to-phase short circuit control circuit and a current loop grounding control circuit, and the error wiring switch module further comprises a current phase sequence error circuit, a current phase-to-phase short circuit and a current loop grounding circuit;

The current phase sequence error circuit comprises three normally open switches of a thirteenth relay, three normally open switches of a fourteenth relay, three normally open switches of a fifteenth relay, three normally open switches of a sixteenth relay, three normally open switches of a seventeenth relay and three normally open switches of an eighteenth relay; the three normally open contacts of the thirteenth relay, the three normally open contacts of the fourteenth relay, the three normally open switches of the fifteenth relay, the three normally open switches of the sixteenth relay, the seventeenth relay and the eighteenth relay are respectively and electrically connected with the three-phase current output end of the terminal block, and the three normally open contacts of the thirteenth relay, the fourteenth relay, the fifteenth relay, the sixteenth relay, the seventeenth relay and the eighteenth relay are respectively and electrically connected with the three-phase current input end of the junction box; the connection corresponding relations of the static contacts of the three normally open switches of the thirteenth relay, the static contacts of the three normally open switches of the fourteenth relay, the static contacts of the three normally open switches of the fifteenth relay, the static contacts of the three normally open switches of the seventeenth relay and the static contacts of the three normally open switches of the eighteenth relay and the three-phase current input end of the junction box are different;

The current phase sequence error control circuit comprises a second knob switch, wherein the selection end of the second knob switch is electrically connected with the first power end of the error wiring switch control module, the first end of the second knob switch is electrically connected with the first end of a thirteenth relay coil, and the second end of the thirteenth relay coil is electrically connected with the second power end of the error wiring switch control module;

the second end of the second knob switch is electrically connected with the first end of the fourteenth relay coil, and the second end of the fourteenth relay coil is electrically connected with the second power supply end;

the third end of the second knob switch is electrically connected with the first end of the fifteenth relay coil, and the second end of the fifteenth relay coil is electrically connected with the second power supply end;

the fourth end of the second knob switch is electrically connected with the first end of the sixteenth relay coil, and the second end of the sixteenth relay coil is electrically connected with the second power supply end;

the fifth end of the second knob switch is electrically connected with the first end of the seventeenth relay coil, and the second end of the seventeenth relay coil is electrically connected with the second power supply end;

the sixth end of the second knob switch is electrically connected with the first end of the eighteenth relay coil, and the second end of the eighteenth relay coil is electrically connected with the second power supply end;

The current interphase short-circuit comprises a first passage of a fourteenth double-blade lockable button, a first passage of a fifteenth double-blade lockable button and a first passage of a sixteenth double-blade lockable button, wherein the first passage of the fourteenth double-blade lockable button is connected between a first phase current output end and a second phase current output end of the terminal block, the first passage of the fifteenth double-blade lockable button is connected between a second phase current output end and a third phase current output end of the terminal block, and the first passage of the sixteenth double-blade lockable button is connected between the first phase current output end and the third phase current output end of the terminal block;

the current phase-to-phase short circuit control circuit comprises a second passage of a fourteenth double-blade lockable button, a second passage of a fifteenth double-blade lockable button and a second passage of a sixteenth double-blade lockable button, and the second passage of the fourteenth double-blade lockable button, the second passage of the fifteenth double-blade lockable button and the second passage of the sixteenth double-blade lockable button are connected in parallel between the first power supply end and the second power supply end;

the current loop grounding circuit comprises a first passage of a seventeenth double-blade lockable button, a first passage of an eighteenth double-blade lockable button and a first passage of a nineteenth double-blade lockable button, wherein the first end of the first passage of the seventeenth double-blade lockable button is electrically connected with a first phase current output end of the terminal block, the first end of the first passage of the eighteenth double-blade lockable button is electrically connected with a second phase current output end of the terminal block, the first end of the first passage of the nineteenth double-blade lockable button is electrically connected with a third phase current output end of the terminal block, and the second end of the first passage of the seventeenth double-blade lockable button, the second end of the first passage of the eighteenth double-blade lockable button and the second end of the first passage of the nineteenth double-blade lockable button are all grounded;

The current loop grounding control circuit comprises a second passage of a seventeenth double-blade lockable button, a second passage of an eighteenth double-blade lockable button and a second passage of a nineteenth double-blade lockable button, and the second passage of the seventeenth double-blade lockable button, the second passage of the eighteenth double-blade lockable button and the second passage of the nineteenth double-blade lockable button are connected in parallel between the first power supply end and the second power supply end.

6. The apparatus according to claim 5, wherein:

the miswiring switch control module further comprises a current loop open circuit control circuit and a current polarity miscontrol circuit, and the miswiring switch module further comprises a current loop open circuit and a current polarity miscontrol circuit;

the current loop open circuit comprises a nineteenth relay normally-closed switch, a twenty-second relay normally-closed switch, a twenty-first relay normally-closed switch, a twenty-second relay normally-closed switch, a twenty-third relay normally-closed switch and a twenty-fourth relay normally-closed switch;

the current polarity error circuit comprises a first normally-closed switch and a second normally-closed switch of a twenty-five relay, a first normally-closed switch and a second normally-closed switch of the twenty-six relay, and a first normally-closed switch and a second normally-closed switch of the twenty-seven relay;

The fixed contact of the nineteenth relay normally-closed switch is electrically connected with the first phase current output end of the terminal block, and the normally-closed contact of the nineteenth relay normally-closed switch is electrically connected with the normally-closed contact of the twenty-fifth relay first normally-closed switch and the normally-open contact of the twenty-fifth relay second normally-closed switch; the fixed contact of the normally-closed switch of the twenty-fifth relay is electrically connected with the first phase current input end of the terminal strip, and the normally-closed contact of the normally-closed switch of the twenty-fifth relay is electrically connected with the normally-closed contact of the second normally-closed switch of the twenty-fifth relay; the static contact of the first normally closed switch of the twenty-fifth relay is electrically connected with the current phase sequence error circuit, and the static contact of the second normally closed switch of the twenty-fifth relay is electrically connected with the first phase circuit output end of the junction box;

the static contact of the twenty-first relay normally-closed switch is electrically connected with the second phase current output end of the terminal strip, and the normally-closed contact of the twenty-first relay normally-closed switch is electrically connected with the normally-closed contact of the twenty-sixth relay and the normally-open contact of the second normally-closed switch of the twenty-first relay; the fixed contact of the twenty-second relay normally-closed switch is electrically connected with the second phase current input end of the terminal strip, and the normally-closed contact of the twenty-sixth relay normally-closed switch is electrically connected with the normally-open contact of the twenty-sixth relay normally-closed switch and the normally-closed contact of the twenty-sixth relay normally-closed switch; the static contact of the first normally closed switch of the twenty-first relay is electrically connected with the current phase sequence error circuit, and the static contact of the second normally closed switch of the twenty-first relay is electrically connected with the second phase circuit output end of the junction box;

The fixed contact of the twenty-third relay normally-closed switch is electrically connected with the third phase current output end of the terminal strip, and the normally-closed contact of the twenty-seventh relay normally-closed switch and the normally-open contact of the twenty-seventh relay normally-closed switch are electrically connected; the fixed contact of the twenty-fourth relay normally-closed switch is electrically connected with the third phase current input end of the terminal strip, and the normally-closed contact of the twenty-seventh relay normally-closed switch is electrically connected with the normally-open contact of the twenty-seventh relay normally-closed switch and the normally-closed contact of the twenty-seventh relay normally-closed switch; the static contact of the first normally closed switch of the twenty-seventh relay is electrically connected with the current phase sequence error circuit, and the static contact of the second normally closed switch of the twenty-seventh relay is electrically connected with the third phase circuit output end of the junction box;

the current loop open-circuit control circuit comprises a seventh control branch, an eighth control branch, a ninth control branch, a tenth control branch, an eleventh control branch and a twelfth control branch, wherein an input end of the seventh control branch, the eighth control branch, the ninth control branch, the tenth control branch, the eleventh control branch and the twelfth control branch after being connected in parallel is electrically connected with a normally closed contact of a second normally closed switch of the power supply control relay, and an output end of the seventh control branch, the eighth control branch, the ninth control branch, the tenth control branch, the eleventh control branch and the twelfth control branch after being connected in parallel is electrically connected with a second power supply end; the static contact of the second normally closed switch of the power supply control relay is electrically connected with the first power supply end;

The seventh control leg includes a twenty-eighth lockable button and a nineteenth relay coil connected in series, the eighth control leg includes a twenty-first lockable button and a twenty-first relay coil connected in series, and the ninth control leg includes a twenty-second lockable button and a twenty-first relay coil connected in series; the tenth control branch comprises a thirteenth lockable button and a twenty-second relay coil connected in series; the eleventh control branch comprises a twenty-fourth lockable button and a twenty-third relay coil connected in series; the twelfth control branch includes a twenty-fifth lockable button and a twenty-fourth relay coil connected in series;

the current polarity error control circuit current loop open circuit control circuit comprises a thirteenth control branch circuit, a fourteenth control branch circuit and a fifteenth control branch circuit, wherein an input end of the thirteenth control branch circuit, the fourteenth control branch circuit and the fifteenth control branch circuit after being connected in parallel is electrically connected with a first power supply end, and an output end of the thirteenth control branch circuit, the fourteenth control branch circuit and the fifteenth control branch circuit after being connected in parallel is electrically connected with a second power supply end;

the fourteenth control leg includes a twenty-eighth lockable button and a twenty-fifth relay coil connected in series, the fifteenth control leg includes a twenty-seventh lockable button and a twenty-sixth relay coil connected in series, and the sixteenth control leg includes a twenty-eighth lockable button and a twenty-seventh relay coil connected in series.

7. The apparatus according to claim 6, comprising:

each relay coil in the current phase sequence error control circuit, the current loop open-circuit control circuit and the current polarity error control circuit is connected with an indicator lamp in parallel;

each button in the current interphase short circuit control circuit and the current loop grounding control circuit is connected with an indicator lamp in series.

8. The apparatus according to claim 7, wherein:

the error wiring switch control module also comprises an auxiliary circuit;

the auxiliary circuit comprises a seventh relay second normally open switch, an eighth relay second normally open switch, a ninth relay second normally open switch, a tenth relay second normally open switch, an eleventh relay second normally open switch, a twelfth relay second normally open switch, a nineteenth relay normally open switch, a twenty-second relay normally open switch, a twenty-first relay normally open switch, a twenty-second relay normally open switch, a twenty-third relay normally open switch, a twenty-fourth relay normally open switch, a twenty-fifth relay normally open switch, a twenty-sixteen relay normally open switch, a twenty-seventh relay normally open switch, a second normally closed switch of the protection relay, a protection relay coil, a first indicator lamp and a second indicator lamp;

The auxiliary circuit comprises a seventh relay second normally open switch, an eighth relay second normally open switch, a ninth relay second normally open switch, a tenth relay second normally open switch, an eleventh relay second normally open switch, a twelfth relay second normally open switch, a nineteenth relay normally open switch, a twenty-second relay normally open switch, a twenty-first relay normally open switch, a twenty-second relay normally open switch, a twenty-third relay normally open switch, a twenty-fourth relay normally open switch, a twenty-fifth relay normally open switch, a twenty-sixteen relay normally open switch and a twenty-seventh relay normally open switch which are connected in parallel, wherein the input end is electrically connected with the first power end, the output end after being connected in parallel is electrically connected with the first end of the protection relay coil,

the fixed contact of the second normally closed switch of the protective relay is electrically connected with the first power end, the normally closed contact is electrically connected with the first end of the second indicator lamp, and the normally open contact is electrically connected with the first end of the first indicator lamp; the second end of the protective relay coil, the second end of the first indicator light and the second end of the second indicator light are all electrically connected with the second power supply end.

9. The apparatus according to claim 8, wherein:

Each indicator light, each button and each knob switch of the error wiring switch control module are integrated on the middle layer board;

the terminal strip, the junction box and the electric energy meter are arranged on the surface layer panel, the surface layer panel is provided with a window area, the middle layer panel corresponds to the window area of the surface layer panel, and the window area is provided with a movable cover plate;

the other devices of the error wiring switch control module, the power supply module and the error wiring switch module are arranged on a bottom panel.