CN-224216835-U - On-load tap-changer testing device

Abstract

The application relates to an on-load tap changer testing device which comprises a tested branch, a harmonic current source branch, a follow current branch and a sampling trigger loop, wherein the harmonic current source branch comprises a high-voltage harmonic source and an adjustable multi-winding step-up transformer, the follow current branch comprises a bypass resistor and an energy absorption unit for rapidly absorbing and consuming impact energy at the moment of switching of a tap changer, and the sampling trigger loop comprises an optical fiber trigger solid-state relay and a high-speed acquisition card. According to the application, through effective combination of all the components, the on-load tap-changer testing device can effectively simulate the complex harmonic environment in a large-scale power grid, comprehensively and accurately test the performance of the on-load tap-changer, and provide reliable technical support for the operation and maintenance of power equipment. The problem that the existing testing device cannot accurately simulate the complex harmonic environment in actual operation, so that a testing result is inaccurate and potential fault hidden trouble of the on-load tap-changer cannot be timely found is effectively solved.

Inventors

• DU SIPING
• ZHAO QIAN

Assignees

• 武汉港瑞电气有限公司

Dates

Publication Date

20260508

Application Date

20250710

Claims (6)

1. 1. The on-load tap changer testing device comprises a tested branch circuit (1), a harmonic current source branch circuit (2), a follow current branch circuit (3) and a sampling trigger loop (4), and is characterized in that the harmonic current source branch circuit (2) comprises a high-voltage harmonic source (21) and an adjustable multi-winding step-up transformer (22), the follow current branch circuit (3) comprises a bypass resistor (31) and an energy absorption unit (32) for rapidly absorbing and consuming impact energy at the moment of switching of the tap changer, and the sampling trigger loop (4) comprises an optical fiber trigger solid-state relay (41) and a high-speed acquisition card (42).
2. 2. An on-load tap-changer testing device according to claim 1, characterized in that the high-voltage harmonic source (21) is of modular design for combining modules according to different test requirements for generating specific harmonic currents.
3. 3. An on-load tap-changer testing device according to claim 1, wherein the energy absorbing unit (32) is a superconducting energy storage unit for fast response and absorbing energy when the tap-changer switches.
4. 4. An on-load tap-changer testing device according to claim 1, wherein the high-speed acquisition card (42) acquires current, vibration, acoustic emission signals simultaneously.
5. 5. An on-load tap-changer testing device according to claim 1, characterized in that the testing device is provided with an electromagnetic interference filter (5).
6. 6. The on-load tap-changer test device of claim 1 wherein the test device housing is made of a conductive shielding material.

Description

On-load tap-changer testing device Technical Field The application relates to the technical field of power equipment detection, in particular to a testing device for an on-load tap-changer. Background With the development of a flexible direct current technology, the working condition that the on-load tap-changer is switched with harmonic current is increasingly prominent, and the on-load tap-changer of the converter station needs to frequently act under complex working conditions of multiple harmonic superposition. The harmonic wave superposition can lead to the shortening of half cycle wave of transfer current, and meanwhile, the zero crossing gradient di/dt is increased, so that great challenges are presented to the transfer current capacity of the vacuum arc extinguishing chamber, and the fault rate is raised, so that higher requirements are presented to the reliability of the tap switch, IEC and GB are established on the basis of the conventional direct current research, but the requirements of load switching test with harmonic current are not presented, and therefore, the harmonic switching test is required to be carried out on the converter transformer vacuum on-load tap switch so as to ensure the application performance of the device. Particularly in large-scale power grids, an on-load tap changer of a power transformer is a key device for guaranteeing voltage stability and electric energy quality, and the working state of the on-load tap changer directly influences the safe operation of the power grid. In the related art, the chinese patent application with the application number CN202322565891.2 proposes an on-load tap-changer testing device. The on-load tap changer testing device comprises a tested branch, a harmonic current source branch and a follow current branch which are connected in parallel on the tested branch, wherein a 12kV power supply bus generates target current through a current limiting inductor L, the target current flows back to the power supply bus to form a testing loop after being subjected to a tested switch on the tested branch, the harmonic current source branch comprises a low-voltage harmonic source HS and a step-up transformer T, the follow current branch comprises a bypass resistor R, a sampling trigger loop is connected to the harmonic current source branch, and the sampling loop is connected to the tested branch. According to the on-load tap-changer testing device, the test requirement of di/dt is met by outputting multiple harmonic combinations through a low-voltage harmonic source, and then the voltage output is lifted in a boosting mode, so that the switch performance test under different voltage classes is realized. The related technology has the following defects that the low-voltage harmonic source HS injects harmonic current through the step-up transformer T, if the step-up transformer T adopts a multi-winding transformer, the step-up transformer T can regulate output to a certain extent, but for a large-scale power grid power transformer, the load characteristic is complex, the required harmonic wave type and amplitude range are wide, the existing low-voltage harmonic source cannot generate enough intensity and diversified harmonic wave, the complex harmonic wave environment in actual operation is difficult to simulate, the test result is inaccurate, and potential fault hidden trouble of the on-load tap-changer cannot be timely found. Disclosure of utility model The application provides a testing device for an on-load tap-changer, which aims to solve the problems that an existing testing device cannot accurately simulate a complex harmonic environment in actual operation, so that a testing result is inaccurate and potential fault hidden trouble of the on-load tap-changer cannot be timely found. The application provides a testing device for an on-load tap-changer, which adopts the following technical scheme: The on-load tap changer testing device comprises a tested branch, a harmonic current source branch, a follow current branch and a sampling trigger loop, and is characterized in that the harmonic current source branch comprises a high-voltage harmonic source and an adjustable multi-winding step-up transformer, the follow current branch comprises a bypass resistor and an energy absorption unit for rapidly absorbing and consuming impact energy at the switching moment of a tap changer, and the sampling trigger loop comprises an optical fiber trigger solid-state relay and a high-speed acquisition card. Furthermore, the high-voltage harmonic source adopts a modularized design and is used for combining modules according to different test requirements to generate specific harmonic currents. Furthermore, the energy absorption unit is a superconducting energy storage unit and is used for rapidly responding and absorbing energy when the tapping switch is switched. Furthermore, the high-speed acquisition card synchronously acquires current, vibration and acoustic emissi