CN215116503U

CN215116503U - Electric energy metering and motor protection module based on alternating current sampling

Info

Publication number: CN215116503U
Application number: CN202120983767.6U
Authority: CN
Inventors: 王�忠
Original assignee: SHANGHAI YUANKONG AUTOMATION TECHNOLOGY CO LTD
Current assignee: SHANGHAI YUANKONG AUTOMATION TECHNOLOGY CO LTD
Priority date: 2021-05-10
Filing date: 2021-05-10
Publication date: 2021-12-10
Anticipated expiration: 2031-05-10

Abstract

The utility model discloses an electric energy measurement and motor protection module based on exchange sampling is equipped with binding post at the left end of PCB silk screen printing board, and the right side is equipped with the interface, the program download mouth, USB debugging mouth and debug debugging mouth that are connected to the secondary module, and the lower extreme of PCB silk screen printing board is equipped with current transformer, zero sequence current transformer and alternating current signal sampling amplifier circuit, and the upper end of PCB silk screen printing board is equipped with voltage transformer, main control chip MCU, the LED pilot lamp to and actual record memory chip. The module has the functions of three-phase voltage, three-phase current, zero sequence/leakage, power, frequency and electric energy metering, quick-break protection, timing limit overcurrent protection, locked rotor protection, overlong starting time, three-phase current unbalance protection and I0 grounding protection; the protection action export has SPI communication interface to send secondary module, communicates through SPI interface and secondary module, and communication rate is fast, and the signal is stable.

Description

Electric energy metering and motor protection module based on alternating current sampling

Technical Field

The utility model relates to an industrial control technical field specifically is an electric energy measurement and motor protection module based on exchange sampling.

Background

In the field of domestic intelligent buildings at present, a fan water pump controller is frequently used in a fresh air conditioning system and a water supply and drainage system, and programs are preset in the intelligent controller, so that the linkage intelligent control of air and water can be realized simply and conveniently. However, the lack of monitoring protection for abnormal operation of the motor in the power plant results in damage and operational failure of the motor. Therefore, in order to solve the problems of motor protection and metering, a module which is simple and convenient to operate, economical and practical in price and stable in operation needs to be developed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an electric energy measurement and motor protection module based on exchange sampling possesses that communication rate is fast, advantages such as signal stability, price economy benefit, operation are stable to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides an electric energy measurement and motor protection module based on exchange sampling, includes PCB silk screen printing board, the left end of PCB silk screen printing board is equipped with binding post, and the right side of PCB silk screen printing board is equipped with interface, the procedure that is connected to the secondary module and downloads mouth, USB debugging mouth and debug the mouth, the lower extreme of PCB silk screen printing board is equipped with current transformer, zero sequence current transformer and alternating current signal sampling amplifier circuit, the upper end of PCB silk screen printing board is equipped with voltage transformer, main control chip MCU, LED pilot lamp to and actual record memory chip.

Preferably, the model of the main control chip MCU is: STM32F103CBT 6.

Preferably, the PCB screen printing plate model is as follows: motor _ LON _ electric, PCB silk screen printing board adopts double-deck board, single face welding components and parts, and forceful electric power district and weak spot district do the separation.

Preferably, the wiring terminals are distributed on a PCB screen printing plate and are connected with four three-phase voltage and zero line terminals, six current transformer input terminals and one zero sequence or leakage access terminal through a PIN12 plug-in terminal.

Preferably, the interface on the right side of the PCB screen printing plate is an SPI communication and module power supply interface and is used for being connected to a secondary module.

Preferably, the program downloading port on the right side of the PCB screen printing plate is a program upgrading port for upgrading a module program by a PC (personal computer) end.

Preferably, the USB debugging port on the right side of the PCB screen printing plate is a module debugging interface and is used for reading and setting the module parameters by a PC (personal computer) end or other handheld modules.

Preferably, the LED indicator lamp on the upper end of the PCB screen printing plate is a module operation indicator and is respectively used for power indication, alarm, trip, communication and reset indication.

Compared with the prior art, the beneficial effects of the utility model are as follows:

the electric energy metering and motor protecting module based on alternating current sampling has the advantages that the measurement of three-phase voltage, three-phase current, zero sequence/leakage, power, frequency and electric energy metering, quick-break protection, timed-limit overcurrent protection, locked rotor protection, overlong starting time, three-phase current unbalance protection and I0 grounding protection are realized; the protection action outlet is provided with an SPI communication interface to send to the secondary module, and the LED indication is used for indicating the running state, the communication state, the trip indication and the alarm indication of the module; the SPI interface is communicated with the secondary module, so that the communication speed is high and the signal is stable.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a three-phase voltage isolation circuit of the present invention;

FIG. 3 shows a three-phase current isolation circuit of the present invention

FIG. 4 shows the zero sequence/leakage isolation circuit of the present invention

FIG. 5 is a three-phase voltage conditioning circuit of the present invention;

fig. 6 is a three-phase current conditioning circuit of the present invention;

fig. 7 is a zero sequence/leakage current conditioning circuit of the present invention;

fig. 8 is a reference voltage circuit of the present invention;

fig. 9 is a frequency conditioning circuit of the present invention;

FIG. 10 shows a main chip and peripheral circuitry of the present invention;

fig. 11 is a USB communication circuit of the present invention;

fig. 12 is an LED indicating circuit according to the present invention.

In the figure: 1. PCB silk screen printing board; 2. a wiring terminal; 3. a current transformer; 4. a zero sequence current transformer; 5. an interface; 6. a program download port; 7. a USB debug port; 8. debug port; 9. an LED indicator light; 10. a memory chip; 11. the main control chip MCU; 12. an alternating current signal sampling amplifying circuit; 13. a voltage transformer; .

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-12, an electric energy metering and motor protecting module based on ac sampling includes a PCB screen printing plate 1, a wiring terminal 2 is disposed at the left end of the PCB screen printing plate 1, an interface 5 connected to a secondary module, a program downloading port 6, a USB debugging port 7 and a debug debugging port 8 are disposed at the right side of the PCB screen printing plate 1, a current transformer 3, a zero sequence current transformer 4 and an ac signal sampling amplifying circuit 12 are disposed at the lower end of the PCB screen printing plate 1, and a voltage transformer 13, a main control chip MCU11, an LED indicator lamp 9 and an actual record storage chip 10 are disposed at the upper end of the PCB screen printing plate 1.

In the above embodiment, the model of the main control chip MCU11 is: STM32F103CBT 6; the model of the PCB screen printing plate 1 is as follows: the method comprises the following steps that (1) a Motor _ LON _ electronic screen printing plate 1 is a double-layer plate, components are welded on one side, and a strong electric area is separated from a weak electric area; the wiring terminals 2 are distributed on the PCB screen printing plate 1 and are connected with four three-phase voltage and zero line terminals, six current transformer input terminals and a zero sequence or leakage access terminal through PIN12 plug-in terminals; the interface 5 on the right side of the PCB screen printing plate 1 is an SPI communication and module power supply interface and is used for being connected to a secondary module; the program downloading port 6 on the right side of the PCB screen printing plate 1 is a program upgrading port and is used for upgrading a module program by a PC (personal computer) end; the USB debugging port 7 on the right side of the PCB screen printing plate 1 is a module debugging interface and is used for reading and setting module parameters by a PC (personal computer) end or other handheld modules; the LED indicator lamp 9 at the upper end of the PCB screen printing plate 1 is a module operation indicator and is respectively used for power supply indication, alarm, trip, communication and reset indication.

Referring to fig. 2, in the present embodiment, the AC220V voltage signal passes through the voltage transformer 13 to generate an AC signal of AC 1V.

Referring to fig. 3, in the present embodiment, the current of AC5A passes through the current transformer 3 to generate AC0.25V AC signal.

Referring to fig. 4, in the present embodiment, the current of AC5A passes through the zero sequence current transformer 4 to generate AC0.25V AC signal.

Referring to fig. 5, in the present embodiment, the voltage signal of AC1V passes through the three-phase voltage conditioning circuit to generate an AC signal with 1.65V as the symmetry axis.

Referring to fig. 6, in the present embodiment, the voltage signal of AC0.25V passes through the three-phase current signal conditioning circuit to generate an ac signal with 1.65V as the symmetry axis.

Fig. 7 shows a zero sequence/leakage current conditioning circuit in this embodiment.

Referring to fig. 8, in the present embodiment, after the voltage of 3.3V is divided by 2 resistors with the same size, a voltage of 1.65V is generated, and then the voltage passes through the emitter follower circuit and then outputs a more stable reference circuit of 1.65V, which is used to raise the level of the ac signal.

Referring to fig. 9, in this embodiment, after the voltage signal is raised by 1.65V, the voltage signal is an ac signal with 1.65V as a symmetry axis, and 1.65V is a zero crossing point of the ac signal.

The working principle is as follows: this electric energy measurement and motor protection module based on interchange sampling, with the module embedded to the secondary module in, fix PCB silk screen printing board 1 through the fixed orifices of four angles departments, external voltage, electric current, zero sequence/leakage signal insert to binding post 2 on, the signal of telecommunication is through mutual-inductor electromagnetic coupling back, through signal conditioning circuit, sends the signal to main control chip MCU11 and carries out the ADC and gather.

The main control chip MCU11 acquires signals, calculates the voltage, current, frequency, power, electric energy and other electrical parameters, caches the electrical parameters in a register, and the secondary module can read the electrical parameters through a spi interface; voltage, current, zero sequence and leakage parameters can be calculated by one cycle.

Detecting that any phase current value of three-phase current is greater than a set quick-break current value, the duration time is greater than set quick-break protection time, the quick-break protection trip is allowed, and the trip flag bit is subjected to OR operation of 0x 00000001; the secondary module reads a trip mark bit and operation 0x00000001 through the SPI interface to protect the trip action.

After the motor is started, detecting that any phase current value of three-phase current is greater than a set fixed time limit protection current value, the duration time is greater than set fixed time limit protection time, the fixed time limit protection trip is allowed, the conditions are met, and tripping mark bits are subjected to OR operation of 0x 00000002; the secondary module reads the tripping marking position and the operation 0x00000002 is true through the SPI interface, and tripping action is protected.

After the motor is started, detecting that any phase current value of three-phase current is greater than 1.2 times of a set inverse time limit protection current value, the duration time is greater than the set inverse time limit protection time, the inverse time limit protection trip allowance meets the conditions, and performing trip marking bit OR operation on 0x 00000004; the secondary module reads the tripping marking position and the operation 0x00000004 is true through the SPI interface, and tripping action is protected.

After the motor is started, detecting that any phase current value of three-phase current is greater than a set locked rotor protection current value, the duration time is greater than set locked rotor protection time, locked rotor protection tripping is allowed, the conditions are met, and tripping mark positions are subjected to OR operation of 0x 00000008; the secondary module reads the tripping mark bit and the operation 0x00000008 is true through the SPI interface, and the tripping action is protected

Detecting starting current, delaying the starting time for overlong time, detecting that the phase current value of any one of three-phase current is larger than a set overlong starting time protection current value, protecting tripping permission for overlong starting time to meet the conditions, and performing tripping marking bit OR operation on 0x 00000010; the secondary module reads the tripping marking position and the operation 0x00000010 is true through the SPI interface, and tripping action is protected.

When the three-phase current unbalance degree is larger than a set value and the duration time is larger than a three-phase current unbalance degree time set value, the three-phase current unbalance degree allows protection tripping, the above conditions are met, and a tripping mark bit is subjected to OR operation of 0x 00000020; the secondary module reads the tripping marking position and the operation 0x00000020 is true through the SPI interface, and tripping action is protected.

Detecting that the zero sequence/electric leakage is larger than a set zero sequence/electric leakage protection current value, the duration is larger than the set zero sequence/electric leakage protection time, the zero sequence/electric leakage protection trip allowance meets the conditions, and performing trip marking bit or operation on 0x 00000040; the secondary module reads the tripping marking bit and the operation 0x00000040 is true through the SPI interface, and the tripping action is protected.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an electric energy measurement and motor protection module based on exchange sampling, includes PCB silk screen printing board (1), its characterized in that: the left end of PCB silk screen printing board (1) is equipped with binding post (2), and the right side of PCB silk screen printing board (1) is equipped with interface (5), the procedure that is connected to the secondary module and downloads mouth (6), USB debugging mouth (7) and debug debugging mouth (8), the lower extreme of PCB silk screen printing board (1) is equipped with current transformer (3), zero sequence current transformer (4) and alternating current signal sampling amplifier circuit (12), the upper end of PCB silk screen printing board (1) is equipped with voltage transformer (13), main control chip MCU (11), LED pilot lamp (9) to and actual record memory chip (10).

2. The ac sampling-based electric energy metering and motor protecting module according to claim 1, wherein: the type of the main control chip MCU (11) is as follows: STM32F103CBT 6.

3. The ac sampling-based electric energy metering and motor protecting module according to claim 1, wherein: the PCB silk screen printing board (1) model is: the Motor _ LON _ electric PCB screen printing plate (1) is a double-layer plate, components are welded on one side, and a strong electric area and a weak point area are separated.

4. The ac sampling-based electric energy metering and motor protecting module according to claim 1, wherein: the wiring terminals (2) are distributed on the PCB screen printing board (1) and are connected with four three-phase voltage and zero line terminals, six current transformer input terminals and a zero sequence or leakage access terminal through PIN12 plug-in terminals.

5. The ac sampling-based electric energy metering and motor protecting module according to claim 1, wherein: and the interface (5) on the right side of the PCB screen printing plate (1) is an SPI communication and module power supply interface and is used for being connected to a secondary module.

6. The ac sampling-based electric energy metering and motor protecting module according to claim 1, wherein: and the program downloading port (6) on the right side of the PCB screen printing plate (1) is a program upgrading port and is used for upgrading a module program by a PC (personal computer) end.

7. The ac sampling-based electric energy metering and motor protecting module according to claim 1, wherein: and the USB debugging port (7) on the right side of the PCB screen printing plate (1) is a module debugging interface and is used for reading and setting the module parameters by a PC (personal computer) end or other handheld modules.

8. The ac sampling-based electric energy metering and motor protecting module according to claim 1, wherein: and the LED indicator lamp (9) at the upper end of the PCB screen printing plate (1) is a module operation indicator and is respectively used for power indication, alarm, tripping, communication and reset indication.