CN218181000U

CN218181000U - Monitoring circuit for power compensation capacitor

Info

Publication number: CN218181000U
Application number: CN202222508415.2U
Authority: CN
Inventors: 李刚; 岳良; 黄海; 刘龙
Original assignee: Shanghai Maohua Electrical Technology Development Co ltd
Current assignee: Shanghai Maohua Electrical Technology Development Co ltd
Priority date: 2022-09-21
Filing date: 2022-09-21
Publication date: 2022-12-30
Anticipated expiration: 2032-09-21

Abstract

The application provides a monitoring circuit for a power compensation capacitor, which comprises a data acquisition module, a data processing module and a data storage module, wherein the data acquisition module comprises a first phase acquisition unit, a second phase acquisition unit and a third phase acquisition unit; the first phase acquisition unit is connected with the data processing module, the second phase acquisition unit is connected with the data processing module, and the third phase acquisition unit is connected with the data processing module; the data processing module is connected with the data storage module, and the first phase acquisition unit, the second phase acquisition unit and the third phase acquisition unit are all connected with a neutral line, so that the monitoring of the power compensation capacitor is realized.

Description

Monitoring circuit for power compensation capacitor

Technical Field

The application relates to the technical field of power equipment online monitoring, in particular to a monitoring circuit for a power compensation capacitor.

Background

In the power system, user equipment can generate active power and reactive power when in use, and the active power is provided for each electric equipment for use; reactive power is useless work such as converting electric energy into a magnetic field. Excessive reactive power increases line losses, thereby reducing power supply efficiency. To improve performance, power compensation capacitors are used. The number of the power compensation capacitors used in the power system is large, the number of the power compensation capacitors accounts for about 10% -20% of the total amount of the substation equipment, and the operation reliability of the power compensation capacitors is directly related to the safe and stable operation of the power system.

At present, when fault detection is carried out on a power compensation capacitor, regular manual inspection is mainly carried out, and fault detection is mainly carried out manually through an external observation and auscultation method. The following drawbacks also exist for the above method: this approach does not allow timely discovery of aging faults in the power compensation capacitor.

In view of the above, a monitoring circuit for a power compensation capacitor is needed to solve the above problems.

Disclosure of Invention

The application provides a monitoring circuit to electric power compensating capacitor to the realization is to electric power compensating capacitor's monitoring.

The application provides a monitoring circuit for a power compensation capacitor, which comprises a data acquisition module, a data processing module and a data storage module, wherein the data acquisition module comprises a first phase acquisition unit, a second phase acquisition unit and a third phase acquisition unit; the first phase acquisition unit is connected with the data processing module, the second phase acquisition unit is connected with the data processing module, and the third phase acquisition unit is connected with the data processing module; the data processing module is connected with the data storage module, and the first phase acquisition unit, the second phase acquisition unit and the third phase acquisition unit are all connected with a neutral line.

The circuit is adopted to monitor the power compensation capacitor, so that the aging fault of the power compensation capacitor can be found in time, and the power compensation capacitor is maintained.

Optionally, the first phase acquisition unit includes a power compensation capacitor subunit, a current sensing subunit, and a voltage sensing subunit; the power compensation capacitor subunit is connected with the current sensing subunit, the current sensing subunit is connected with the voltage sensing subunit, and the voltage sensing subunit is connected with the data processing module.

By adopting the circuit, the values of the power compensation capacitors in different phases are collected, so that the aging fault is prevented.

Optionally, the power compensation capacitor subunit includes a first capacitor and a second capacitor; the current sensing subunit comprises a first current sensor and a second current sensor; the voltage sensing subunit comprises a first voltage sensor; one end of the first capacitor is connected with the line voltage of the phase A, the other end of the first capacitor is connected with the first end of the first current sensor, the second end of the first current sensor is connected with the second end of the first voltage sensor, and the third end of the first current sensor is connected with a neutral line; one end of the second capacitor is connected with the line voltage of the phase A, the other end of the second capacitor is connected with the first end of a second current sensor, the second end of the second current sensor is connected with the second end of the first voltage sensor, and the third end of the second current sensor is connected with a neutral line; the first end of the first voltage sensor is connected with the line voltage of the phase A, the third end of the first voltage sensor is connected with the neutral line, and the fourth end of the first voltage sensor is connected with the data processing module.

By adopting the circuit, the current sensor and the voltage sensor for each power compensation capacitor of the A phase are collected, and the voltage value and the current value of each power compensation capacitor of the A phase are monitored simultaneously.

Optionally, the second phase acquisition unit includes a power compensation capacitor subunit, a current sensing subunit, and a voltage sensing subunit; the power compensation capacitor subunit is connected with the current sensing subunit, the current sensing subunit is connected with the voltage sensing subunit, and the voltage sensing subunit is connected with the data processing module.

By adopting the circuit, the value of the power compensation capacitor of the second phase is collected, and the aging fault is prevented.

Optionally, the power compensation capacitor subunit includes a third capacitor and a fourth capacitor; the current sensing subunit comprises a third current sensor and a fourth current sensor; the voltage sensing subunit comprises a second voltage sensor; one end of the third capacitor is connected with the line voltage of the phase B, the other end of the third capacitor is connected with the first end of a third current sensor, the second end of the third current sensor is connected with the second end of the second voltage sensor, and the third end of the third current sensor is connected with a neutral line; one end of the fourth capacitor is connected with the line voltage of the phase B, the other end of the fourth capacitor is connected with the first end of a fourth current sensor, the second end of the fourth current sensor is also connected with the second end of a second voltage sensor, and the third end of the fourth current sensor is connected with a neutral line; and the first end of the second voltage sensor is connected with the line voltage of the phase B, the third end of the second voltage sensor is connected with a neutral line, and the fourth end of the second voltage sensor is connected with the data processing module.

By adopting the circuit, the current sensor and the voltage sensor are used for collecting each power compensation capacitor of the B phase, and the voltage value and the current value of each power compensation capacitor of the B phase are simultaneously monitored.

Optionally, the third phase acquisition unit includes a power compensation capacitor subunit, a current sensing subunit and a voltage sensing subunit; the power compensation capacitor subunit is connected with the current sensing subunit, the current sensing subunit is connected with the voltage sensing subunit, and the voltage sensing subunit is connected with the data processing module.

Optionally, the power compensation capacitor subunit includes a fifth capacitor and a sixth capacitor; the current sensing subunit comprises a fifth current sensor and a sixth current sensor; the voltage sensing subunit comprises a third voltage sensor; one end of the fifth capacitor is connected with the line voltage of the phase C, the other end of the fifth capacitor is connected with the first end of a fifth current sensor, the second end of the fifth current sensor is connected with the second end of a third voltage sensor, and the third end of the fifth current sensor is connected with a neutral line; one end of the sixth capacitor is connected with the line voltage of the phase C, the other end of the sixth capacitor is connected with the first end of a sixth current sensor, the second end of the sixth current sensor is connected with the second end of a third voltage sensor, and the third end of the sixth current sensor is connected with a neutral line; the first end of the third voltage sensor is connected with the line voltage of the phase C, the third end of the third voltage sensor is connected with the neutral line, and the fourth end of the third voltage sensor is connected with the data processing module.

By adopting the circuit, the current sensor and the voltage sensor are used for collecting each power compensation capacitor of the C phase, and the voltage value and the current value of each power compensation capacitor of the C phase are simultaneously monitored.

Optionally, the data processing module includes a single chip microcomputer MCU, a first resistor, a second resistor, a third resistor, a fourth resistor, a comparator, a triode, and a diode;

an AD port in the MCU is connected with the data acquisition module, an I/O1 port in the MCU is connected with one end of the third resistor, a CND port in the MCU is grounded, a VCC port in the MCU is connected with one end of the second resistor, a VCC port in the MCU is also connected with one end of the fourth resistor, and an I/O2 port in the MCU is connected with one end of the first resistor; the other end of the first resistor is connected with the anode of the input end of the comparator; the other end of the third resistor is connected with the negative electrode of the input end of the comparator; the other end of the second resistor is connected with a power supply end of the comparator, and a grounding end of the comparator is grounded; the other end of the fourth resistor is connected with a collector of the triode, the output end of the comparator is connected with a base of the triode, an emitting electrode of the triode is connected with the anode of the diode, and the cathode of the diode is grounded.

By adopting the circuit, the data acquired by the data acquisition module is subjected to analog-to-digital conversion, the preset value and the difference value are compared in the comparator, and when the difference value is greater than the preset value, the comparator outputs a high level, the triode is conducted, the diode is conducted, and the working personnel is prompted.

Optionally, the circuit further includes a transmission module, and a transmission mode of the transmission module includes any one of: zigBee, ethernet, bluetooth, and RS232.

By adopting the circuit, the transmission modes comprise a wireless mode and a wired mode, and the circuit is suitable for various occasions.

Optionally, the first current sensor includes a current collecting and transmitting plate and a current signal transmitter, the first end of the first current sensor is connected to the other end of the first capacitor, the third end of the first current sensor is connected to a neutral line, and the second end of the first current sensor is connected to the first voltage sensor.

Compared with the prior art, the invention has the beneficial effects that: the monitoring to the electric power compensation capacitor is realized through the circuit, the manual work of going to the on-site inspection electric power compensation capacitor is reduced, the real-time monitoring is carried out to the electric power compensation capacitor through the circuit, when the aging fault occurs, the staff is timely found and reminded to go to the on-site to maintain.

Drawings

Fig. 1 is a schematic structural diagram of a monitoring circuit for a power compensation capacitor according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a first phase acquisition unit of a monitoring circuit for a power compensation capacitor according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of a first phase acquisition unit structure of a monitoring circuit for a power compensation capacitor according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of a second phase acquisition unit of a monitoring circuit for a power compensation capacitor according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a second phase acquisition unit of another monitoring circuit for a power compensation capacitor according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a third phase acquisition unit of a monitoring circuit for a power compensation capacitor according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a third phase acquisition unit of a monitoring circuit for a power compensation capacitor according to an embodiment of the present application;

fig. 8 is a schematic diagram of a data processing module of a monitoring circuit for a power compensation capacitor according to an embodiment of the present application.

Reference numerals are as follows: the device comprises a data acquisition module 101, a data processing module 102, a data storage module 103, a first phase acquisition unit 201, a second phase acquisition unit 202, a third phase acquisition unit 203, a first capacitor CAP1, a second capacitor CAP2, a first current sensor CT-A1, a second current sensor CT-A2, a first voltage sensor PT-A, a third capacitor CAP3, a fourth capacitor CAP4, a third current sensor CT-B1, a fourth current sensor CT-B2, a second voltage sensor PT-B, a fifth capacitor CAP5, a sixth capacitor CAP6, a fifth current sensor CT-C1, a sixth current sensor CT-C2, a third voltage sensor PT-C, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a triode Q1 and a diode D1.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present specification, the technical solutions in the embodiments of the present specification will be clearly and completely described below with reference to the drawings in the embodiments of the present specification, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.

Furthermore, the terms "first," "second," and the like in the description and claims of this application or in the foregoing drawings are used for distinguishing between different objects and not necessarily for describing a particular sequential order, either explicitly or implicitly, including one or more of the features.

In the description of the present application, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected," "connected," or "communicatively connected" should be construed broadly, for example, "connected," "connected," or "communicatively connected" may mean not only a physical connection, but also an electrical connection or a signal connection, for example, a direct connection, i.e., a physical connection, or an indirect connection via at least one element therebetween, as long as a circuit is connected or a communication is established between two elements; signal connection may refer to signal connection through a medium, such as radio waves, in addition to signal connection through circuitry. The specific meaning of the above terms in this application will be understood to be a specific case for those of ordinary skill in the art.

In a power system, when a power compensation capacitor is subjected to fault detection, regular manual inspection is performed, and fault detection is mainly performed manually through an external observation and auscultation method. When fault detection is carried out manually, the aged fault of the power compensation capacitor cannot be found in time.

The embodiment of the application provides a schematic diagram of a monitoring circuit structure of a power compensation capacitor; as shown in fig. 1, the circuit includes a data acquisition module 101, a data processing module 102, and a data storage module 103, wherein the data acquisition module 101 includes a first phase acquisition unit 201, a second phase acquisition unit 102, and a third phase acquisition unit 203; the first phase acquisition unit 201 is connected with the data processing module 102, the second phase acquisition unit 202 is connected with the data processing module 102, and the third phase acquisition unit 203 is connected with the data processing module 102; the data processing module 102 is connected with the data storage module 103, and the first phase acquisition unit (201), the second phase acquisition unit (202) and the third phase acquisition unit (203) are all connected with a neutral line.

All include electric power compensation capacitor in data acquisition module 101, gather electric power compensation capacitor's voltage and electric current, with the signal transmission who gathers to data processing module 102 in, supply the circuit in data processing module 102 to judge, if the signal of gathering takes place ageing failure, remind the staff to go to maintain through the diode.

In a possible embodiment, fig. 2 is a schematic structural diagram of a first phase acquisition unit of a monitoring circuit for a power compensation capacitor provided in an embodiment of the present application, and referring to fig. 2, the first phase acquisition unit 201 includes a power compensation capacitor subunit 301, a current sensing subunit 302, and a voltage sensing subunit 303;

the power compensation capacitor subunit 301 is connected to the current sensing subunit 302, the current sensing subunit 302 is connected to the voltage sensing subunit 303, and the voltage sensing subunit 303 is connected to the data processing module 102.

In addition, fig. 3 is a schematic diagram of a first phase acquisition unit of a monitoring circuit for a power compensation capacitor according to an embodiment of the present application; referring to fig. 3, the power compensation capacitance subunit 301 includes a first capacitance CAP1 and a second capacitance CAP2; the current sensing subunit 302 includes a first current sensor CT-A1 and a second current sensor CT-A2; the voltage sensing subunit 303 includes a first voltage sensor PT-a; one end of a first capacitor CAP1 is connected with the line voltage of the phase A, the other end of the first capacitor CAP1 is connected with a first end of a first current sensor CT-A1, a second end of the first current sensor CT-A1 is connected with a second end of a first voltage sensor PT-A, and a third end of the first current sensor CT-A1 is connected with a neutral line; one end of a second capacitor CAP2 is connected with the line voltage of the phase A, the other end of the second capacitor CAP2 is connected with a first end of a second current sensor CT-A2, a second end of the second current sensor CT-A2 is connected with a second end of a first voltage sensor PT-A, and a third end of the second current sensor CT-A2 is connected with a neutral line; the first end of the first voltage sensor PT-A is connected with the line voltage of the phase A, the third end of the first voltage sensor PT-A is connected with the neutral line, and the fourth end of the first voltage sensor PT-A is connected with the data processing module 102.

The circuit principle is as follows: the first capacitor CAP1 and the second capacitor CAP2 are power compensation capacitors in the phase A, data acquisition is carried out on the power compensation capacitors in the phase A, each power compensation capacitor is connected with a current sensor in series, and the current of a single power compensation capacitor is acquired; the current sensor is connected with the voltage sensor, and when the power supply of the voltage sensor is turned on, the current sensor connected with the voltage sensor is powered on at the same time, so that the voltage sensor and the current sensor can start to work at the same time; because the resistance generated by the current sensor is negligible, the voltage sensor CT-a collects the voltage between the phase a and the ground, that is, the voltage of the power compensation capacitor. And outputting the collected voltage or current to the data processing module 102 through the fourth end of the first voltage sensor PT-a.

The first current sensor CT-A1 comprises a current collecting and transmitting plate and a current signal transmitter, converts detected current into an electric signal which meets the standard according to a certain rule and outputs the electric signal to the current collecting and transmitting plate, the current collecting and transmitting plate outputs the electric signal to the data processing module 102, and the data processing module 102 tests the input current.

In a possible embodiment, fig. 4 is a schematic structural diagram of a second phase collecting unit of a monitoring circuit for a power compensation capacitor provided in an embodiment of the present application, and referring to fig. 4, a second phase collecting unit 202 includes a power compensation capacitor subunit 401, a current sensing subunit 402, and a voltage sensing subunit 403; the power compensation capacitance subunit 401 is connected to the current sensing subunit 402, the current sensing subunit 402 is connected to the voltage sensing subunit 403, and the voltage sensing subunit 403 is connected to the data processing module 102.

In addition, fig. 5 is a schematic structural diagram of a second phase acquisition unit of a monitoring circuit for a power compensation capacitor according to an embodiment of the present application; referring to fig. 5, the power compensation capacitance subunit 401 includes a third capacitance CAP3 and a fourth capacitance CAP4; the current sensing subunit 502 includes a third current sensor CT-B1 and a fourth current sensor CT-B2; the voltage sensing subunit 403 includes a second voltage sensor PT-B; one end of a third capacitor CAP3 is connected with the line voltage of the phase B, the other end of the third capacitor CAP3 is connected with a first end of a third current sensor CT-B1, a second end of the third current sensor CTB1 is connected with a second end of a second voltage sensor PT-B, and a third end of the third current sensor CT-B1 is connected with a neutral line; one end of a fourth capacitor CAP4 is connected with the line voltage of the phase B, the other end of the fourth capacitor CAP4 is connected with the first end of a fourth current sensor CT-B2, the second end of the fourth current sensor CT-B2 is also connected with the second end of a second voltage sensor PT-B, and the third end of the fourth current sensor CT-B2 is connected with a neutral line; the first end of the second voltage sensor PT-B is connected with the line voltage of the phase B, the third end of the second voltage sensor PT-B is connected with a neutral line, and the fourth end of the second voltage sensor PT-B is connected with the data processing module 102.

The circuit principle is as follows: the third capacitor CAP3 and the fourth capacitor CAP4 are power compensation capacitors in the phase B, and are used for acquiring data of the power compensation capacitors in the phase B, and each power compensation capacitor is connected with a current sensor in series to acquire the current of a single power compensation capacitor; the current sensor is connected with the voltage sensor, and when the power supply of the voltage sensor is turned on, the current sensor connected with the voltage sensor is powered on at the same time, so that the voltage sensor and the current sensor can start to work at the same time; because the resistance generated by the current sensor is negligible, the voltage sensor CT-B collects the voltage between the phase B and the ground, namely the voltage of the power compensation capacitor. And outputting the collected voltage or current to the data processing module 102 through the fourth terminal of the second voltage sensor PT-B.

In a possible embodiment, fig. 6 is a schematic structural diagram of a third phase collecting unit of a monitoring circuit for a power compensation capacitor provided in an embodiment of the present application; referring to fig. 6, the third phase acquisition unit 203 includes a power compensation capacitance subunit 601, a current sensing subunit 602, and a voltage sensing subunit 603; the power compensation capacitor subunit 601 is connected with the current sensing subunit 602, the current sensing subunit 602 is connected with the voltage sensing subunit 603, and the voltage sensing subunit 603 is connected with the data processing module 602.

In addition, fig. 7 is a schematic structural diagram of a third phase acquisition unit of a monitoring circuit for a power compensation capacitor provided in an embodiment of the present application; referring to fig. 7, the power compensation capacitance subunit 601 includes a fifth capacitance CAP5 and a sixth capacitance CAP6; the current sensing subunit 602 includes a fifth current sensor CT-C1 and a sixth current sensor CT-C2; the voltage sensing subunit 603 includes a third voltage sensor PT-C; one end of a fifth capacitor CAP5 is connected with the line voltage of the phase C, the other end of the fifth capacitor CAP5 is connected with the first end of a fifth current sensor CT-C1, the second end of the fifth current sensor CT-C1 is connected with the second end of a third voltage sensor PT-C, and the third end of the fifth current sensor CT-C1 is connected with a neutral line; one end of a sixth capacitor CAP6 is connected with the line voltage of the phase C, the other end of the sixth capacitor CAP6 is connected with the first end of a sixth current sensor CT-C2, the second end of the sixth current sensor CT-C2 is connected with the second end of a third voltage sensor PT-C, and the third end of the sixth current sensor CT-C2 is connected with a neutral line; the first end of a third voltage sensor PT-C is connected with the line voltage of the phase C, the third end of the third voltage sensor PT-C is connected with a neutral line, and the fourth end of the third voltage sensor PT-C is connected with the data processing module 102.

The circuit principle is as follows: the fifth capacitor CAP5 and the sixth capacitor CAP6 are power compensation capacitors in the C phase, and when data acquisition is performed on the power compensation capacitors in the C phase, each power compensation capacitor is connected in series with one current sensor to acquire the current of a single power compensation capacitor; the current sensor is connected with the voltage sensor, and when the power supply of the voltage sensor is turned on, the current sensor connected with the voltage sensor is powered on at the same time, so that the voltage sensor and the current sensor can start to work at the same time; because the resistance generated by the current sensor is negligible, the voltage sensor CT-C collects the voltage between the C phase and the ground, namely the voltage of the power compensation capacitor. And outputting the collected voltage or current to the data processing module 102 through the fourth terminal of the third voltage sensor PT-C.

In a possible embodiment, fig. 8 is a schematic diagram of a data processing module of a monitoring circuit for a power compensation capacitor according to an embodiment of the present application, and refer to fig. 8; the data processing module 102 comprises a single chip microcomputer MCU, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a comparator, a triode Q1 and a diode D1; an AD port in the MCU is connected with the data acquisition module 101, an I/O1 port in the MCU is connected with one end of a third resistor R3, a CND port in the MCU is grounded, a VCC port in the MCU is connected with one end of a second resistor R2, the VCC port in the MCU is also connected with one end of a fourth resistor R4, and an I/O2 port in the MCU is connected with one end of a first resistor R1; the other end of the first resistor R1 is connected with the anode of the input end of the comparator; the other end of the third resistor R3 is connected with the negative electrode of the input end of the comparator; the other end of the second resistor R2 is connected with a power supply end of a comparator, and a grounding end of the comparator is grounded; the other end of the fourth resistor R4 is connected with the collector of the triode Q1, the output end of the comparator is connected with the base of the triode Q1, the emitting electrode of the triode Q1 is connected with the positive electrode of the diode D1, and the negative electrode of the diode D1 is grounded.

The circuit principle is as follows: analog signals acquired by the data acquisition module 101 are input from an AD port of the single-chip microcomputer MCU, and the acquired analog signals are converted into digital signals in the single-chip microcomputer MCU; the digital signal output by the R1 and the digital signal output by the R3 are calculated in the comparator, and the difference between the digital signal output by the R1 and the digital signal output by the R3 is compared with the signal output by the R2; the output signal may be one of a current or a voltage. When the difference value is larger than the signal output by the R2, the comparator outputs high level, the triode Q1 is conducted, the diode D1 is conducted, and the R4 has a protection effect on the triode Q1 and the diode D1. When the difference value is smaller than the signal output by the R2, the comparator outputs a low level, the triode Q1 is not conducted, and the diode D1 is not conducted. The values of the power compensation capacitors on the A phase, the B phase and the C phase are collected, collected signals are input into the data processing module to be processed, the processed data are transmitted in a wired or wireless mode, the signals are converted in the data processing module, and whether the output signals are high level or not is judged through the comparator. And when the high level is reached, the triode is conducted, and after the triode is conducted, the diode is conducted, which represents that the aging fault exists in the currently collected power compensation capacitor.

Fig. 8 is only a circuit diagram for collecting signals of the single-phase power compensation capacitor, and when the signals of the a-phase, B-phase and C-phase power compensation capacitors are collected, a circuit diagram of a data processing module is required to be provided for each of the a-phase, B-phase and C-phase power compensation capacitors, which will not be described in detail herein. When the circuit compensation capacitor of the phase A is monitored, the diode is conducted, the program fault of the power compensation capacitor of the phase A is indicated, and the position of the power compensation capacitor with the fault can be positioned according to whether the diode is conducted or not.

In a possible embodiment, the circuit further includes a transmission module, and a transmission mode of the transmission module includes any one of: zigBee, ethernet, bluetooth, and RS232. After the data processing module 102 processes the acquired data, the data can be transmitted to the data storage module 103 in a wireless manner such as ZigBee or Bluetooth; the data may also be transmitted to the data storage module 103 by a wired method such as RS232. The specific transmission mode is mainly based on the actual situation.

Through the embodiment, the utility model has the following advantages that the monitoring of the power compensation capacitor is realized through the circuit, and the manual work for on-site inspection of the power compensation capacitor is reduced; the power compensation capacitor is monitored in real time through the circuit, and when an aging fault occurs, a worker is timely found and reminded to go to the site for maintenance; the data collected every time are stored, so that the maintenance period of the power compensation capacitor can be conveniently adjusted through historical data collection.

While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or technical improvements to the market, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the invention is defined by the appended claims.

Claims

1. A monitoring circuit for a power compensation capacitor, characterized in that the circuit comprises a data acquisition module (101), a data processing module (102) and a data storage module (103), wherein the data acquisition module (101) comprises a first phase acquisition unit (201), a second phase acquisition unit (202) and a third phase acquisition unit (203);

the first phase acquisition unit (201) is connected with the data processing module (102), the second phase acquisition unit (202) is connected with the data processing module (102), and the third phase acquisition unit (203) is connected with the data processing module (102); the data processing module (102) is connected with the data storage module (103), and the first phase acquisition unit (201), the second phase acquisition unit (202) and the third phase acquisition unit (203) are all connected with a neutral line.

2. The monitoring circuit according to claim 1, wherein the first phase acquisition unit (201) comprises a power compensation capacitance subunit (301), a current sensing subunit (302), and a voltage sensing subunit (303);

the power compensation capacitor subunit (301) is connected with the current sensing subunit (302), the current sensing subunit (302) is connected with the voltage sensing subunit (303), and the voltage sensing subunit (303) is connected with the data processing module (102).

3. The monitoring circuit according to claim 2, wherein the power compensating capacitive subunit (301) comprises a first capacitance (CAP 1) and a second capacitance (CAP 2); the current sensing subunit (302) comprises a first current sensor (CT-A1) and a second current sensor (CT-A2); the voltage sensing subunit (303) comprises a first voltage sensor (PT-A);

one end of the first capacitor (CAP 1) is connected with the line voltage of the phase A, the other end of the first capacitor (CAP 1) is connected with the first end of a first current sensor (CT-A1), the second end of the first current sensor (CT-A1) is connected with the second end of a first voltage sensor (PT-A), and the third end of the first current sensor (CT-A1) is connected with a neutral line;

one end of the second capacitor (CAP 2) is connected with the line voltage of the phase A, the other end of the second capacitor (CAP 2) is connected with the first end of a second current sensor (CT-A2), the second end of the second current sensor (CT-A2) is connected with the second end of a first voltage sensor (PT-A), and the third end of the second current sensor (CT-A2) is connected with a neutral line;

the first end of the first voltage sensor (PT-A) is connected with the line voltage of the phase A, the third end of the first voltage sensor (PT-A) is connected with a neutral line, and the fourth end of the first voltage sensor (PT-A) is connected with the data processing module (102).

4. The monitoring circuit according to claim 1, wherein the second phase acquisition unit (202) comprises a power compensation capacitance subunit (401), a current sensing subunit (402) and a voltage sensing subunit (403);

the power compensation capacitor subunit (401) is connected with the current sensing subunit (402), the current sensing subunit (402) is connected with the voltage sensing subunit (403), and the voltage sensing subunit (403) is connected with the data processing module (102).

5. The monitoring circuit according to claim 4, wherein the power compensating capacitance subunit (401) comprises a third capacitance (CAP 3) and a fourth capacitance (CAP 4); the current sensing subunit (502) comprises a third current sensor (CT-B1) and a fourth current sensor (CT-B2); the voltage sensing subunit (403) comprises a second voltage sensor (PT-B);

one end of the third capacitor (CAP 3) is connected with the line voltage of the phase B, the other end of the third capacitor (CAP 3) is connected with the first end of a third current sensor (CT-B1), the second end of the third current sensor (CTB 1) is connected with the second end of a second voltage sensor (PT-B), and the third end of the third current sensor (CT-B1) is connected with a neutral line;

one end of the fourth capacitor (CAP 4) is connected with the line voltage of the phase B, the other end of the fourth capacitor (CAP 4) is connected with the first end of a fourth current sensor (CT-B2), the second end of the fourth current sensor (CT-B2) is also connected with the second end of a second voltage sensor (PT-B), and the third end of the fourth current sensor (CT-B2) is connected with a neutral line;

the first end of the second voltage sensor (PT-B) is connected with the line voltage of the phase B, the third end of the second voltage sensor (PT-B) is connected with a neutral line, and the fourth end of the second voltage sensor (PT-B) is connected with the data processing module (102).

6. The monitoring circuit according to claim 1, wherein the third phase acquisition unit (203) comprises a power compensation capacitance subunit (601), a current sensing subunit (602), and a voltage sensing subunit (603);

the power compensation capacitor subunit (601) is connected with the current sensing subunit (602), the current sensing subunit (602) is connected with the voltage sensing subunit (603), and the voltage sensing subunit (603) is connected with the data processing module (102).

7. The monitoring circuit according to claim 6, wherein the power compensation capacitance subunit (601) comprises a fifth capacitance (CAP 5) and a sixth capacitance (CAP 6); the current sensing subunit (602) comprises a fifth current sensor (CT-C1) and a sixth current sensor (CT-C2); the voltage sensing subunit (603) comprises a third voltage sensor (PT-C);

one end of the fifth capacitor (CAP 5) is connected with the line voltage of the phase C, the other end of the fifth capacitor (CAP 5) is connected with the first end of a fifth current sensor (CT-C1), the second end of the fifth current sensor (CT-C1) is connected with the second end of a third voltage sensor (PT-C), and the third end of the fifth current sensor (CT-C1) is connected with a neutral line;

one end of the sixth capacitor (CAP 6) is connected with the line voltage of the phase C, the other end of the sixth capacitor (CAP 6) is connected with the first end of a sixth current sensor (CT-C2), the second end of the sixth current sensor (CT-C2) is connected with the second end of a third voltage sensor (PT-C), and the third end of the sixth current sensor (CT-C2) is connected with a neutral line;

the first end of the third voltage sensor (PT-C) is connected with the line voltage of the phase C, the third end of the third voltage sensor (PT-C) is connected with the neutral line, and the fourth end of the third voltage sensor (PT-C) is connected with the data processing module (102).

8. The monitoring circuit according to claim 1, wherein the data processing module (102) comprises a single-chip microcomputer MCU, a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a comparator, a triode (Q1) and a diode (D1);

an AD port in the MCU is connected with the data acquisition module (101), an I/O1 port in the MCU is connected with one end of the third resistor (R3), a CND port in the MCU is grounded, a VCC port in the MCU is connected with one end of the second resistor (R2), a VCC port in the MCU is also connected with one end of the fourth resistor (R4), and an I/O2 port in the MCU is connected with one end of the first resistor (R1);

the other end of the first resistor (R1) is connected with the anode of the input end of the comparator; the other end of the third resistor (R3) is connected with the negative electrode of the input end of the comparator; the other end of the second resistor (R2) is connected with a power supply end of the comparator, and a grounding end of the comparator is grounded; the other end of the fourth resistor (R4) is connected with a collector of the triode (Q1), the output end of the comparator is connected with a base of the triode (Q1), an emitting electrode of the triode (Q1) is connected with the positive electrode of the diode (D1), and the negative electrode of the diode (D1) is grounded.

9. The monitoring circuit of claim 1, further comprising a transmission module, wherein the transmission mode of the transmission module comprises any one of: zigBee, ethernet, bluetooth, and RS232.

10. The monitoring circuit according to claim 3, wherein the first current sensor (CT-A1) comprises a current collecting and transmitting plate and a current signal transmitter, a first end of the first current sensor (CT-A1) is connected with the other end of the first capacitor (CAP 1), a third end of the first current sensor (CT-A1) is connected with a neutral line, and a second end of the first current sensor (CT-A1) is connected with the first voltage sensor (PT-A).