CN-121984029-A - Self-adaptive boosting reactive compensation system for field inspection of voltage transformer

Abstract

The invention provides a self-adaptive boosting reactive compensation system for field inspection of a voltage transformer, which belongs to the technical field of high-voltage equipment detection and comprises a power supply unit, a measurement control system and a data acquisition unit, wherein the power supply unit comprises a combined reactor unit, a test transformer and a voltage regulating unit and is used for applying adjustable power frequency voltage and reactive compensation to the tested voltage transformer, the measurement control system comprises a controller, the controller is configured to execute cooperative control logic and is used for controlling voltage regulating output of the voltage regulating unit, signal acquisition and transmission of the data acquisition unit and cooperative control of switching of reactors in the combined reactor unit, and the combined reactor unit comprises a plurality of groups of fixed reactors and relays corresponding to the number of the reactors, and the reactors are arranged in parallel in a predefined capacity combination. The method has the advantages that parameter measurement and compensation adjustment are synchronously completed in the boosting process, and the optimal compensation effect can be ensured to be maintained in the full voltage range.

Inventors

• WANG ZIJUN
• TIAN MINZHE
• ZHENG KE
• ZENG XINYI
• LI BINGYANG
• PENG XIAOPING
• ZHANG SHUCANG
• LIU YANG
• LIU TIANQI
• ZHANG HONGFEI
• LIU XIAOJIE
• ZHAO YUFU
• YU ZIXUAN
• ZHANG KAN
• YANG LEI
• ZHANG YUXIAO
• GAO LIMING
• LIAO TAO
• WANG PING
• JI QINGYU

Assignees

• 国网河南省电力公司营销服务中心

Dates

Publication Date

20260505

Application Date

20260206

Claims (8)

1. 1. The self-adaptive boosting reactive power compensation system for the field inspection of the voltage transformer is characterized by comprising a power supply unit (2), a measurement control system and a data acquisition unit; The power supply unit (2) comprises a combined reactor unit (3), a test transformer (4) and a voltage regulating unit (5) and is used for applying adjustable power frequency voltage and reactive compensation to the tested voltage transformer; The input winding of the voltage regulating unit (5) is connected with a transformer substation power supply, and the output winding of the voltage regulating unit is connected with the input winding of the experimental transformer (4); the measurement control system comprises a controller (1), wherein the controller (1) is configured to execute cooperative control logic for controlling the voltage regulation output of a voltage regulation unit (5), the signal acquisition and transmission of a data acquisition unit and the cooperative control of the switching of a reactor in a combined reactor unit (3); The data acquisition unit is used for acquiring electrical parameters of the system in real time and sending data to the controller (1) as a basis of reactive compensation inductance; The combined reactor unit (3) comprises a plurality of groups of fixed reactors and relays with the number corresponding to the number of the reactors, the reactors are arranged in parallel in a predefined capacity combination, and step-by-step compensation is performed at preset compensation intervals.
2. 2. The self-adaptive boosting reactive power compensation system for field inspection of a voltage transformer according to claim 1, wherein the combined reactor unit (3) integrates an electric shielding and a magnetic shielding, wherein the electric shielding is covered between a primary winding and a secondary winding by copper foil, the magnetic shielding is realized by a closed magnetic circuit iron core structure of the combined reactor unit (3), the closed magnetic circuit iron core structure comprises an annular shielding cover made of a high-permeability soft magnetic alloy material, a coil of the reactor comprises two coils arranged at different nodes based on the shape of the closed magnetic circuit iron core, and the two coils are connected in series.
3. 3. The adaptive boost reactive compensation system for field inspection of voltage transformers according to claim 1, characterized in that the data acquisition unit acquires the output voltage of the output winding of the test transformer (4) in real time And output current And transmits data to the controller (1).
4. 4. The adaptive boost reactive compensation system of claim 3, wherein the cooperative control logic of the measurement control system comprises: The voltage regulating unit (5) is controlled to output a set voltage, and the data acquisition unit is used for acquiring the output of the test transformer (4) And A value; According to the formula Calculating the equivalent capacitance of the primary loop Wherein Angular frequency based on the formula Calculating the required compensation inductance L; the controller (1) adjusts the switching of the reactor step by step at preset compensation intervals until the inductance value matches the target value 。
5. 5. A voltage transformer field inspection adaptive boost reactive compensation system according to claim 3, characterized in that the data acquisition unit comprises a sampler (6), the high-voltage side sampler (6) is connected in series with the high-voltage tail end of the test transformer (4), the data acquisition unit is used for synchronously acquiring voltage current phase and amplitude signals, and calculating a real-time phase difference between the output voltage U and the output current I as a basis for calculating compensation inductance in the adaptive reactive compensation.
6. 6. An adaptive boost reactive compensation system for field inspection of voltage transformers according to claim 1 characterized in that the combined reactor unit (3) is sealed in a container filled with SF6 gas.
7. 7. An adaptive boost reactive compensation method for field inspection of a voltage transformer, based on the adaptive boost reactive compensation system for field inspection of a voltage transformer according to claim 1, comprising: the measurement control system is used for controlling the voltage regulating unit (5) to output set voltage, and the data acquisition unit is used for acquiring the output voltage U and the output current I of the high-voltage tail end of the test transformer (4) in real time; The controller (1) calculates the equivalent capacitance C of the loop according to the formula ωC=U/I based on the collected U and I data, and then calculates the required compensation inductance L according to ωL=1/ωC; the combined reactor unit (3) is provided with a plurality of groups of reactors with fixed capacity based on a binary weight principle, and the controller (1) controls relay switching reactors in the combined reactor unit (3) to realize reactive compensation in a preset compensation range.
8. 8. The adaptive boost reactive compensation method for field inspection of voltage transformers according to claim 7, wherein the reactors are arranged in parallel with 3.125kVA, 6.25kVA, 12.5kVA, 25kVA, 50kVA capacity combinations for achieving matching of compensation ranges 0-96.875kVar, the method of controlling relay switching comprising: The controller (1) obtains a target inductance value L to be compensated according to calculation, and then the controller (1) controls a relay in the combined reactor unit to switch according to the target inductance value L so that the total inductance value of the access circuit matches the target value; The controller (1) judges and switches the reactors in sequence according to the sequence from the large capacity to the small capacity, and the specific sequence is 50kVA, 25kVA, 12.5kVA, 6.25kVA and 3.125kVA; After the switching is finished, the controller (1) monitors the compensation effect in real time through the data acquisition unit, and if the compensation deviation exceeds +/-1.5%, the compensation is performed again.

Description

Self-adaptive boosting reactive compensation system for field inspection of voltage transformer Technical Field The invention belongs to the technical field of high-voltage equipment detection, and particularly relates to a self-adaptive boosting reactive power compensation system for field inspection of a voltage transformer. Background The voltage transformer is a key metering device for electric quantity settlement, and the accurate and reliable metering of the voltage transformer is a basis for guaranteeing fairness and fairness of electric power transaction. The field verification of the voltage transformer is a foundation for guaranteeing safe and stable operation and fair electric quantity transaction of the electric power system, the voltage transformer for trade settlement is incorporated into the national forced verification instrument catalogue, and the voltage transformer is required to be subjected to the first verification and the periodic verification on site according to the national verification rules; under complex scenes such as GIS transformer substation, the primary loop distributed capacitance is greatly different and difficult to accurately estimate, the conventional method is difficult in the process of adjusting the inductance value of the reactor, repeated testing and estimation are often needed, the workload is heavy, potential safety hazards exist, an effective self-adaptive compensation mechanism is lacking in the prior art, the cooperative control of boosting and adjusting sense cannot be realized, and the safety and efficiency of detection work are restricted. Disclosure of Invention In view of the defects in the prior art, the invention provides a self-adaptive boosting reactive compensation system for field inspection of a voltage transformer, which aims to solve the technical problems and adopts the technical scheme that the self-adaptive boosting reactive compensation system comprises a power supply unit, a measurement control system and a data acquisition unit; The power supply unit comprises a combined reactor unit, a test transformer and a voltage regulating unit, and is used for applying adjustable power frequency voltage and reactive compensation to the tested voltage transformer; the input winding of the voltage regulating unit is connected with a transformer substation power supply, and the output winding of the voltage regulating unit is connected with the input winding of the experimental transformer; the measurement control system comprises a controller, wherein the controller is configured to execute cooperative control logic for controlling the cooperative control of voltage regulation output of a voltage regulation unit, signal acquisition and transmission of a data acquisition unit and switching of a reactor in a combined reactor unit; the data acquisition unit is used for acquiring electrical parameters of the system in real time and sending data to the controller as a basis of reactive compensation inductance; The combined reactor unit comprises a plurality of groups of fixed reactors and relays with the number corresponding to that of the reactors, the reactors are arranged in parallel in a predefined capacity combination mode, and step-by-step compensation is conducted at preset compensation intervals. Further, the combined reactor unit integrates an electric shielding and a magnetic shielding, wherein the electric shielding is formed by covering a space between a primary winding and a secondary winding through copper foil, the magnetic shielding is realized through a closed magnetic circuit iron core structure of the combined reactor unit, the closed magnetic circuit iron core structure comprises an annular shielding cover made of a high-permeability soft magnetic alloy material, a coil of the reactor comprises two coils arranged at different nodes based on the shape of the closed magnetic circuit iron core, and the two coils are connected in series. Further, the data acquisition unit acquires the output voltage of the output winding of the test transformer in real timeAnd output currentAnd transmitting the data to the controller. Further, the cooperative control logic of the measurement control system includes: The voltage regulating unit is controlled to output set voltage, and the data acquisition unit is used for acquiring the output of the test transformer AndA value; According to the formula Calculating the equivalent capacitance of the primary loopWhereinAngular frequency based on the formulaCalculating the required compensation inductance L; The controller adjusts the switching of the reactor step by step at preset compensation intervals until the inductance value matches the target value 。 Further, the data acquisition unit comprises a sampler, the sampler is connected in series with the high-voltage tail end of the test transformer, the data acquisition unit is used for synchronously acquiring voltage current phase and amplitude signals, and ca