35kv surge arrester power frequency continuous current interrupting ability test device and method

Abstract

The invention provides a testing device and method for a power frequency follow current interruption capability of a 35kV lightning protector. The testing device comprises a charging unit CHA, a powerfrequency power supply P, an impact current unit ICG, a control unit C, a protection reactor L2, a current detection unit and a voltage detection unit. According to the device provided by the invention, standard 4 / 10 impact current is output through the ICG and 35kV rated network voltage is generated through an LC topological circuit; the standard 4 / 10 impact current and the 35kV rated network voltage are applied to two ends of the 35kV lightning protector in a time sharing manner through phase control of the control unit, and the power frequency follow current interruption capability of the35kV lightning protector is verified. According to the device provided by the invention, a high-voltage impact current source is electrically connected with the power frequency power supply through aninsulating matching design; the device has the advantages of small occupied area, low testing cost, capability of ensuring the testing success rate by a one-button start function and the like.

Description

technical field [0001] The invention relates to a power frequency continuous current interruption capability test of a lightning arrester, in particular to a test device and method for a power frequency continuous current interruption capability of a 35kV lightning arrester. Background technique [0002] Developed countries have carried out long-term research on the power frequency continuous current interruption capability test of power line arresters. At present, a large-scale test device for testing the power frequency continuous current interruption capability of line arresters has been developed. The device integrates lightning impulse and power frequency power supply to simulate The actual working condition of the line arrester in the hanging network operation is struck by lightning, but its synchronous control method is realized by controlling the closing and opening of the circuit breaker through a single-chip microcomputer or PLC control system, which costs a lot of ...

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Problems solved by technology

[0002] Developed countries have carried out long-term research on the power frequency continuous current interruption capability test of power line arresters. At present, a large-scale test device for testing the power frequency continuous current interruption capability of line arresters has been developed. The device integrates lightning impulse and power frequency power supply to simulate The actual working condition of the line arrester in the hanging network operation is struck by lightning, but its synchronous control method is realized by controlling the closing and opening of the circuit breaker through a single-chip microcomputer or PLC control system, which costs a lot of money and equipment space; at the same time, it is necessary to test the circuit breaker separately The inherent closing time, opening time and ignition time of the ignition device, etc., need to be precisely controlled and executed according to a certain sequence to ensure the success of the test, and the test failure rate is relatively high; The current power supply is controlled synchronously with the lightning impulse voltage of hundreds of kilovolts. How to avoid the electromagnetic interference of high-frequency high-current magnetic fields and high-amplitude and fast-rising electromagnetic pulses during electromagnetic compatibility design is a key technology. Interference causes false triggering of the synchronous control circuit, resulting in test failure, and even serious equipment failure and personal injury

[0003] The existing technology involves the design of the power frequency power supply formed by the use of the LC oscillating circuit, which does not consider whether the LC parameter configuration can provide enough energy for the power frequency power supply, the control of the loop impedance for the attenuation degree of the power frequency power supply, etc., and these two points are very important for verification The conclusion criterion of the arrester's power frequency freewheeling current interrupting ability test is of great significance

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