CN112051459A - Phase checking method and charged display with double phase checking functions - Google Patents
Phase checking method and charged display with double phase checking functions Download PDFInfo
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- 239000004973 liquid crystal related substance Substances 0.000 claims description 26
- 230000009977 dual effect Effects 0.000 claims description 11
- 230000006911 nucleation Effects 0.000 claims description 6
- 238000010899 nucleation Methods 0.000 claims description 6
- 238000005086 pumping Methods 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 description 11
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- 230000000295 complement effect Effects 0.000 description 2
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- 238000007689 inspection Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
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- 230000033228 biological regulation Effects 0.000 description 1
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- G01R29/18—Indicating phase sequence; Indicating synchronism
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a phase checking method and an electrified display with double phase checking functions, wherein the electrified display comprises a pumping type capacitive sensor, a voltage detection device, a voltage comparison module, a microcontroller module, an alarm lamp, a three-phase electrified display lamp and a three-phase checking hole; and (3) subtracting the voltage reference value measured by the reference charged display from the comparison voltage value measured by the branch charged display, wherein the same phase is obtained if the displayed phase difference value is 0 or 360 degrees, otherwise, the phases are different and the phase sequence has problems, so that the phase relation can be intuitively obtained in real time, and the purpose of phase checking is achieved.
Description
Technical Field
The invention belongs to the technical field of power equipment detection, and particularly relates to a phase checking method and a charged display with dual phase checking functions.
Background
The existing nuclear phase operation test for medium and low voltage distribution networks mainly comprises a primary nuclear phase and a secondary nuclear phase. The primary nuclear phase has the characteristics of clear and direct test results, convenience in operation and the like, and is widely applied to nuclear phase work of overhead lines. However, in order to improve the insulation capability and the insulation level of the equipment and increase the safety of the equipment in use, the electrical equipment in the application places of the ring main unit such as the distribution network switch, the demarcation room and the like gradually develops into a totally enclosed form. Because the whole electrical equipment has no exposed point which can be used for connecting the primary phase checking device during the live operation, the function of the primary phase checking cannot be realized, and only a secondary phase checking mode can be adopted. However, the accuracy and reliability of the secondary nuclear phase are easily affected directly by the wiring correctness of the equipment, the operation regulation of operators and the like. The irregular operation may cause a problem of wrong judgment of the phase checking result. If an error occurs in the phase checking process, serious consequences such as current overload and motor reversal can occur between different devices in the operation process.
The reasons for causing the error in judging the phase checking result of the system line or the electrical equipment are many, and mainly include the aspects of method error, error of a phase checking device, wiring error of a device and a line body and the like in the phase checking process of field operation and maintenance personnel. However, the current commercial high-utilization charged displays lack intuitiveness and visibility in reflecting the phase-to-phase relationship between different electrical devices. Meanwhile, the phase checking means adopted in the current field operation and maintenance process is single, the whole device can only complete the phase checking operation through the three-phase checking hole arranged on the panel and by means of external equipment such as a phase checking instrument, and the correctness of the phase checking result cannot be verified in time. Once the phase checking result has a deviation, operation and maintenance personnel are required to power off the related equipment, disassemble the ring main unit again, check the cable or overhead line connected with the upstream and the downstream and the device body one by one according to the source, and finally determine the position of the opposite phase sequence by adopting a mode of gradually reducing the problem range. The whole operation and verification process needs to consume a large amount of time and energy, the workload of operation and maintenance personnel on-site operation is greatly increased, and the long-time power failure of related users can also cause economic loss to a certain degree. Meanwhile, the device does not have a self-checking function, and in the process of actually checking phase errors on site, the problems that whether the wiring of the body of the live display device is correct or not cannot be directly judged and timely corrected, the site phase checking mode is single, the phase checking result cannot be directly and timely verified and the like cannot be solved, and therefore certain limitation exists in the practical use.
Disclosure of Invention
The invention aims to provide a phase checking method and a charged display with double phase checking functions, and aims to solve the problems that in the prior art, a field phase checking mode is single, and a phase checking result cannot be directly and timely verified.
In order to realize the purpose, the following technical scheme is adopted:
a nuclear phase method comprising:
installing a charged display at the position of an incoming line switch of the ring main unit as a reference charged display, and taking a voltage magnitude value of the ring main unit measured by the reference charged display as a voltage reference value;
respectively installing a charged display as a branch charged display at other ring main units needing nuclear phase operation, and taking the voltage value of the ring main unit measured by the branch charged display as a comparison voltage value;
and (3) subtracting the comparison voltage value from the voltage reference value, wherein the comparison voltage value is in phase if the phase difference value is 0 or 360 degrees, otherwise, the phase is different and the phase sequence has problems.
Furthermore, when the phases are different and the phase sequence has problems, an alarm is given.
Furthermore, the reference charged display and the branch charged display both comprise liquid crystal display screens, the voltage reference value is displayed on the liquid crystal display screen of the reference charged display, and the branch voltage value and the difference result between the comparison voltage value and the voltage reference value are displayed on the liquid crystal display screen of the branch charged display.
The other technical scheme of the invention is as follows:
a charged display with dual nucleation capability for use in the nucleation method of claim 1, comprising:
the voltage-extracting type capacitance sensor is used for extracting the voltage of a line to be detected and is connected to the display wiring terminal row through a lead;
the voltage detection device is used for obtaining a voltage value of the line to be detected according to the voltage extracted by the voltage-extracting type capacitance sensor and sending the voltage value to the microcontroller module;
the voltage comparison module is used for making a difference between voltage values detected by two electrified displays arranged at different positions of a line to be detected and sending the voltage difference value to the microcontroller module;
and the microcontroller module is used for displaying the voltage value of the line to be detected by the voltage detection device and the voltage difference value detected by the two electrified displays arranged at different positions of the line to be detected on the liquid crystal display screen.
Furthermore, the intelligent alarm device also comprises an alarm lamp, wherein the alarm lamp is connected with the microcontroller module and used for alarming.
Further, the display device comprises an electrified display shell, wherein the liquid crystal display device, the three-phase nuclear phase hole, the three-phase electrified display lamp and the alarm lamp are all arranged on the front surface of the electrified display shell.
Further, the display terminal block is installed inside the electrified display shell.
Furthermore, an outlet hole and an inlet hole are arranged at the top of the electrified display shell; the incoming line of the pumping-type capacitive sensor enters the electrified display from the incoming line hole and is connected with the display wiring terminal row; and the outgoing line of the display wiring terminal row is led out from the outgoing line hole and is connected into the voltage comparison module of another electrified display.
Further, still include the electrified display lamp of three-phase, the electrified display lamp of three-phase with display binding post row connects for show that the circuit that awaits measuring is whether electrified, and when electrified, the electrified display lamp of three-phase is bright.
And further, the display device also comprises a three-phase nuclear phase hole, wherein the three-phase nuclear phase hole is connected with the display connecting terminal row and is used for connecting external nuclear phase equipment.
Compared with the prior art, the invention has the following technical effects:
according to the invention, the liquid crystal display screen arranged on the display module can realize visual display of the voltage magnitude values collected by the charged displays in different ring main units. The voltage collected by the capacitive sensor at the incoming line switch is selected as a voltage reference value, and the voltage reference value is compared with a voltage phase angle applied to a looped network cabinet for interconnection of switch cabinets or multipath power supply, so that the phase relation can be visually obtained in real time, and the purpose of phase checking is achieved.
The invention can realize the automatic phase checking function in different ring main units, and can achieve the phase checking function without other external equipment. The realization of the automatic nuclear phase function greatly reduces the workload of field operation and maintenance personnel, improves the working efficiency and shortens the time required by power generation.
The internal nuclear phase function of the invention can form double guarantee with the external nuclear phase, and the two can be verified mutually, thus greatly improving the accuracy of the secondary nuclear phase result.
The nuclear phase alarm lamp is arranged on the display panel of the electrified display, and when the phase sequence or the phase between the ring main units has deviation, the alarm lamp can be lightened, and on-site operation and maintenance personnel can be prompted to check and correct.
The electrified display can provide more visual and accurate phase sequence and phase relation data for field operation and maintenance personnel, and can automatically complete the function of internal phase checking without performing phase checking operation. The external nuclear phase hole and the internal nuclear phase function complement each other and verify each other, so that the time and the times of extra power failure inspection caused by a nuclear phase result error can be effectively reduced, and phase data with higher reference value is provided for operations such as loop closing and reversing in the actual operation process.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a perspective view of a charged display provided in an embodiment of the present invention;
FIG. 2 is a top view of a charged display according to an embodiment of the present invention;
FIG. 3 is an electrical connection diagram of a phase checking method according to an embodiment of the present invention, in which the phase sequence is normal;
FIG. 4 is an electrical connection diagram of a nuclear phase method according to an embodiment of the present invention, in which phase A and phase C are connected in opposite directions;
wherein: the display screen comprises a 1-liquid crystal display screen, a 2-three-phase electrified display lamp, a 3-three-phase nuclear phase hole, a 4-alarm lamp, a 5-three-phase wire inlet hole and a 6-three-phase wire outlet hole.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
The embodiment of the invention provides a phase checking method and a charged display with double phase checking functions, and aims to solve the problems that an original charged display is single in phase checking method and cannot strictly ensure the correctness of a phase checking result, so that the charged display can directly display the phase relation among different ring main units and has multiple functions of automatic phase checking, autonomous inspection and the like. The electrified display designed in the invention is mainly suitable for electrical equipment with functions of double-circuit power supply or interconnection switch and the like, and is arranged on a wire inlet cabinet or an interconnection switch cabinet in a ring main unit.
(1.1) As shown in FIGS. 1 to 2, a charged display having a dual nuclear phase function, comprising:
the pumping type capacitive sensor is arranged on an incoming line or an outgoing line of a cable or an overhead line and the like of the ring main unit, extracts a part of voltage value through induction, and is connected to a display wiring terminal row through a lead.
The voltage detection device is used for obtaining a voltage value of the line to be detected according to the voltage extracted by the voltage-extracting type capacitance sensor and sending the voltage value to the microcontroller module;
the voltage comparison module is used for making a difference between voltage values detected by two electrified displays arranged at different positions of a line to be detected and sending the voltage difference value to the microcontroller module;
the microcontroller module is used for displaying the voltage value of the line to be detected by the voltage detection device and the voltage difference value detected by the two electrified displays arranged at different positions of the line to be detected on the liquid crystal display screen 1;
the alarm lamp 4 is connected with the microcontroller module; the alarm lamp 4 may be an LED lamp mounted on the housing of the live display, or may be a virtual alarm lamp on the liquid crystal display screen 1.
Electrified display lamp 2 of three-phase, electrified display lamp 2 of three-phase with display binding post row connects for show that the circuit that awaits measuring is whether electrified, and when electrified, electrified display lamp 2 of three-phase is bright.
And the three-phase nuclear phase hole 3 is connected with the display wiring terminal row and used for connecting external nuclear phase equipment to perform external nuclear phase.
The display device is characterized by further comprising an electrified display shell, wherein the liquid crystal display device, the three-phase nuclear phase hole 3, the three-phase electrified display lamp 2 and the alarm lamp 4 are all installed on the front face of the electrified display shell. The display terminal block is installed inside the electrified display shell.
The top of the electrified display shell is provided with a three-phase wire outlet hole 6 and a three-phase wire inlet hole 5; the incoming line of the pumping-type capacitive sensor and the wiring of a reference electrified display both enter the electrified display of the phase to be checked from the three-phase incoming line hole 5 and are connected with the wiring terminal row corresponding to the display; and the outgoing line of the display wiring terminal row is led out from the three-phase outgoing line hole 6 and is connected to a voltage comparison module of another electrified display, and is connected with the corresponding electrified display needing phase checking operation.
(1.2) another technical scheme of the invention is as follows:
a method of nucleation, the method being an internal nucleation, comprising: an electrified display installed at the wire inlet position of the ring main unit serves as a reference electrified display, and a voltage magnitude value of the ring main unit measured by the reference electrified display serves as a voltage reference value;
respectively installing live-line displays as branch live-line displays at other ring main units which are connected with a communication switch or two-way or multi-way power supply in a demarcation box in the same switch needing nuclear phase operation, and taking the voltage value of the ring main unit measured by the branch live-line displays as a comparison voltage value;
the comparison voltage value is differed from the voltage reference value, the result is displayed on a liquid crystal display panel 1 corresponding to the electrified display, if the displayed phase difference value is 0 or 360 degrees within a certain error allowable range, the phase is the same phase, otherwise, the phase is different, the phase sequence has problems, and an alarm is given;
it should be noted that in an abnormal operation mode, if the position of the incoming line switch changes, the reference charged display and the branch charged display may exchange roles to ensure that the internal nuclear phase function can work normally.
The reference charged display and the branch charged display respectively comprise a liquid crystal display screen 1, the voltage reference value is displayed on the liquid crystal display screen 1 of the reference charged display, and the branch voltage value and the difference value result of the comparison voltage value and the voltage reference value are displayed on the liquid crystal display screen 1 of the branch charged display.
(II) the present invention will be further explained with reference to specific embodiments.
When the nuclear phase operation between different ring main units in the same switch or a demarcation box is carried out, the switch 1-1 ring main unit is a wire inlet cabinet, the upper end of a live display on the ring main unit of the switch 1-1 is provided with three-phase wire outlet holes 6, the three wires are connected with the live display in the ring main unit which needs the nuclear phase verification subsequently (the switch 2-1 is used in a two-way power supply occasion, and the switch 1-2 or other appointed switching ring point switch equipment is used in a communication switch occasion), the phasor value of the voltage collected by the live display of the switch 1-1 is transmitted to the voltage comparison module of other live displays and is compared with the voltage phase value on the live display of a destination end.
And taking the voltage value acquired by the reference charged indicator corresponding to the incoming line end as a voltage reference value capable of carrying out phase comparison, and obtaining the relative relation of the voltage phases between the ring main units with different incoming line sources under the same demarcation box or the switch by taking the phase difference between the comparison voltage value extracted by the sensors of the branch charged indicators in different ring main units and the voltage reference value of the incoming line switch. On the premise of allowing a certain error margin, if the displayed phase difference value is about 0 or 360 degrees, the phase is the same phase, otherwise, the phase difference and the phase sequence between the corresponding switch circuits are regarded as different and have problems.
Meanwhile, the electrified display is also provided with the liquid crystal display screen 1, and the difference value of the voltage magnitude and the phase position of each ring main unit to be phase-checked and the reference ring main unit is reflected on the liquid crystal display screen 1, so that operation and maintenance personnel can read out the relative voltage phase value of the same phase among different ring main units in the most direct mode, and the purpose of automatic phase checking is further achieved.
As shown in fig. 3 and 4, the voltage of the liquid crystal display panel 1 is also obtained from the voltage collected by the pumped voltage capacitance sensor (in fig. 3 and 4, only the liquid crystal display panel 1 with the display at the switch 1-1 is shown), so that the liquid crystal display panel 1 can normally display information such as phase relationship between different switches even when the switches are not closed.
As shown in fig. 3 and 4, the alarm lamp 4 is disposed on the live display of the present invention, and the alarm lamp 4 may be an LED lamp mounted on the housing of the live display, or may be a virtual alarm lamp integrated on the liquid crystal display (in fig. 3 and 4, only the alarm lamp 4 of the live display at the switch 1-1 is shown, and at this time, the alarm lamp 4 is a solid LED lamp). On the premise of allowing a certain error margin, if the displayed phase difference value is about 0 or 360 degrees, the phase difference value is the same phase, otherwise, the phase difference value and the phase sequence between corresponding switch circuits are regarded as different phases and have problems, an alarm lamp 4 of the device can be turned on to prompt operation and maintenance personnel to check the error reason of the phase sequence or the phase sequence in time, corresponding adjustment and error correction are carried out, and field personnel are prompted to strictly forbid operations such as closing a loop or switching back a brake when the alarm lamp 4 is turned on. The configuration of the alarm lamp 4 can help an operator to quickly find the equipment phase checking problem in the simplest and most direct mode, direct direction guidance is provided for timely correcting the wiring error problem of a line or a device and the like, and the alarm lamp has important practical value for reducing the occurrence of power failure accidents caused by loop closing failure.
The display panel of the charged display still remains the external three-phase nuclear phase hole 3, so that the charged display is ensured to have dual functions of an internal nuclear phase and an external nuclear phase. The two nuclear phase modes complement each other and verify each other, so that the correctness and the reliability of a nuclear phase result are improved to the maximum extent, and the problems that the nuclear phase mode of field operation and maintenance personnel is single, the judgment error exists in secondary nuclear phase and the like are effectively solved.
Taking a communication switch cabinet in a certain most common switch as an example, an electrical connection diagram corresponding to a live display adopted by the invention is shown in fig. 3, power supply sources of a switch 1-1 and a switch 1-2 belong to different lines respectively, and a phase checking operation is required before a loop closing or reversing mode operation is carried out. The voltage vector value collected by the charged display in the switch 1-1 is transmitted to the charged display of the subsequent interconnection switch 1-2 through the outgoing line of the charged display, and other switches which are the same as the switch 1-1 in the bus are selected as auxiliary verification. And the voltage comparison module compares and calculates the difference between the voltage comparison module and the voltage magnitude value acquired by the electrified display on the corresponding ring main unit, so that the vector relation of the three phases of the electrified display ABC of other to-be-checked switch cabinets relative to the voltage of the electrified display of the switch 1-1 can be obtained. And the relative relation of the phase angle is directly displayed on the display screen of each electrified display, so that the direct observation and collection of the phase relation of different ring main units are realized, and the purpose of internal phase checking is achieved.
Assuming a possible wiring error of a system, the electrical connection structure thereof is shown in fig. 4. The switch 1-1 and the switch 1-2 of the switch belong to two different power supply points respectively, the phase sequence of the incoming line of the switch 1-1 is ABC, but the wiring of the phase A and the phase C in the electrified display is reversely connected, namely the actual phase displayed by the electrified display of the switch 1-1 is CBA; the phase of the incoming line of the switch 1-2 is CBA, when the two are subjected to phase checking by using a phase checking device, because the problem of reverse connection of phase sequences occurs at the same time, the checking result of the phase checking device is displayed to be in phase, the judgment of the wiring sequence of the equipment is correct, namely, the problem of wiring errors existing in the actual field cannot be verified by using the phase checking device. However, once the two power supply points are operated in a loop closing or reversing mode, the problem of phase mismatch is exposed, which directly causes the current in the system to suddenly increase greatly, and the relay protection device acts to jump off the fault position, thereby causing accidents such as power failure and the like, and seriously affecting the power supply reliability of the system.
Assuming that the wrong connection mode shown in FIG. 4 occurs, the phase angle of the voltage collected by the electrified display of the switch 1-1 is θA1、θB1、θC1And the reference phasor value is used as a reference phasor value of voltage and is transmitted to the interconnection switch 1-2 and the switch 1-3 which is on the same bus as the switch 1-1 through a wire along the routing position of the bus. The selection switches 1-3 are used to make an auxiliary verification of the phasing result. The phase angles of the voltages collected by the electrified displays corresponding to the rest of the ring main units are theta in sequenceA2、θB2、θC2，θA3、θB3、θC3. And carrying out difference comparison on the voltage phase value and the reference voltage phase value which are respectively acquired, so as to obtain the relative phase relation of different switches relative to the switch 1-1, namely:
although beta isA21、βB21、βC21Three phase angle relationships showed the phase sequence was correct, but at validation of βA31、βB31、βC31The phase angle relationship of (2) will cause a large degree of angular deviation of 0 or 360 °, and the deviation occurs between A, C phases, so that the problem of phase sequence error between A, C phases of the switch 1-1 can be found by judgment, and needs to be solved and corrected in time. Meanwhile, because the nuclear phase of the switch 1-1 has a problem, the problem that the A, C phases of the switch 1-2 are also dislocated can be inferred, namely the problems of wiring errors of a live display of the switch 1-1 and incoming line phase sequence errors of the switch 1-2 which cannot be detected by only a nuclear phase instrument before are solved, and the problems can be directly detected after the invention is used, namely the internal nuclear phase function is completed. When the actually measured phase sequence of the same-phase electrified display is different and the phase angle difference has certain deviation, the alarm lamp 4 arranged on the display panel can be lightened, and the automatic alarm can prompt the field operator. In this case, when the connection is wrong, the A, C-phase alarm lamp 4 on the live display panel of the corresponding switch 1-3 is turned on, and the B-phase alarm lamp 4 is not turned on, which reflects that the phase sequence of A, C two phases of the two switches and A, C two phases of the switch 1-1 are in problem, and further checking and timely correcting are required. Before the correction is completed, operations such as loop closing are not allowed, otherwise faults such as two-phase short circuit can occur.
Therefore, the invention can be verified to completely realize the autonomous internal nuclear phase function, and the phase relation between different switches under the same shutter or demarcation box can be read directly through the voltage phase value presented on the liquid crystal panel on the electrified display without any external equipment. Meanwhile, once an error occurs in internal wiring, an alarm indicator lamp on a display panel of the electrified display is turned on, and on-site operation and maintenance personnel can directly analyze the switch position of the wiring error without rechecking, so that power failure detection is pertinently completed, and the problems of phase sequence errors and the like are timely corrected. The invention is also suitable for the nuclear phase work of the ring main unit with two-way or multi-way power supply.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (10)
1. A nuclear phase method, comprising:
installing a charged display at the position of an incoming line switch of the ring main unit as a reference charged display, and taking a voltage magnitude value of the ring main unit measured by the reference charged display as a voltage reference value;
respectively installing a charged display as a branch charged display at other ring main units needing nuclear phase operation, and taking the voltage value of the ring main unit measured by the branch charged display as a comparison voltage value;
and (3) subtracting the comparison voltage value from the voltage reference value, wherein the comparison voltage value is in phase if the phase difference value is 0 or 360 degrees, otherwise, the phase is different and the phase sequence has problems.
2. The nuclear phase method according to claim 1, characterized in that an alarm is given when the phase sequence is problematic and the phases are different.
3. The nuclear phase method according to claim 1, wherein the reference charged display and the branch charged display each include a liquid crystal display, the voltage reference value is displayed on the liquid crystal display of the reference charged display, and the branch voltage value and the result of the difference between the comparison voltage value and the voltage reference value are displayed on the liquid crystal display of the branch charged display.
4. A charged display with dual nucleation capability for use in the nucleation method of claim 1, comprising:
the voltage-extracting type capacitance sensor is used for extracting the voltage of a line to be detected and is connected to the display wiring terminal row through a lead;
the voltage detection device is used for obtaining a voltage value of the line to be detected according to the voltage extracted by the voltage-extracting type capacitance sensor and sending the voltage value to the microcontroller module;
the voltage comparison module is used for making a difference between voltage values detected by two electrified displays arranged at different positions of a line to be detected and sending the voltage difference value to the microcontroller module;
and the microcontroller module is used for displaying the voltage value of the line to be detected by the voltage detection device and the voltage difference value detected by the two electrified displays arranged at different positions of the line to be detected on the liquid crystal display screen.
5. The electrified display with dual nuclear phase function of claim 4, further comprising a warning lamp connected to the microcontroller module for warning.
6. The electrified display with the dual nuclear phase function of claim 4, further comprising an electrified display shell, wherein the liquid crystal display device, the three-phase nuclear phase hole, the three-phase electrified display lamp and the alarm lamp are all arranged on the front surface of the electrified display shell.
7. The charged-with-display with dual nuclear phase function as claimed in claim 6, wherein said display terminal block is mounted inside said charged-with-display case.
8. The charged display with dual nuclear phase function according to claim 7, wherein an outlet hole and an inlet hole are arranged on the top of the charged display shell; the incoming line of the pumping-type capacitive sensor enters the electrified display from the incoming line hole and is connected with the display wiring terminal row; and the outgoing line of the display wiring terminal row is led out from the outgoing line hole and is connected into the voltage comparison module of another electrified display.
9. The live display with the dual nuclear phase function according to claim 4, further comprising a three-phase live display lamp, wherein the three-phase live display lamp is connected with the display terminal strip and used for displaying whether a line to be tested is live or not, and when the line to be tested is live, the three-phase live display lamp is turned on.
10. The charged display with dual nuclear phase function according to claim 4, further comprising a three-phase nuclear phase hole connected with said display terminal row for connecting an external nuclear phase device.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113740685A (en) * | 2021-09-23 | 2021-12-03 | 南京尚华电力科技有限公司 | Ring main unit partial discharge detection method based on coupling capacitance technology |
| CN113917220A (en) * | 2021-10-09 | 2022-01-11 | 广东电网有限责任公司 | Three-phase live display, cable line phase sequence monitoring and checking device and method |
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| CN113917220A (en) * | 2021-10-09 | 2022-01-11 | 广东电网有限责任公司 | Three-phase live display, cable line phase sequence monitoring and checking device and method |
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