Test evaluation method and system of frequent-switching capacitive current switch equipment

Abstract

The invention discloses a test evaluation method and system of frequent-switching capacitive current switch equipment. The method comprises steps that a C2-level standard test on to-be-evaluated switch equipment is carried out; the ratio of the cumulative arc energy in A switching pre-breakdown processes in the test to the average arc energy of a single switching in the actual operation conditionis calculated, and the reliable switching number of the switch equipment in the actual operation condition corresponding to B short arc breaks without severe breakdown in the test is further calculated; X cycle margin tests for the switch equipment are continuously carried out on the basis; if the switch equipment reliably breaks, the switch equipment is determined to satisfy the reliable switching frequency required by the actual operation condition; a closing resistor is added to a break to improve service life of a contact head of the switch equipment in the C2-level standard test. The method is advantaged in that whether the switch equipment can meet long-term safe operation demands in engineering can be verified.

Description

technical field [0001] The invention relates to the field of electrical equipment testing, and more specifically, to a test evaluation method and system for switching equipment that frequently switches on and off capacitive currents. Background technique [0002] In the development process of switchgear such as circuit breakers, the capacitive current switching capacity is an important factor affecting the structure of the interrupter and the opening / closing speed. The UHV power grid has a large power adjustment range, and the AC filter bank or reactive power compensation capacitor bank has a large capacity and frequent switching. When the switchgear closes the capacitor bank or the AC filter bank, the closing inrush current is large. Although the capacitive current value is not large during the breaking process, the recovery voltage of the breaking current is high, which is prone to heavy breakdown and causes serious overshooting. voltage, causing great harm to the system....

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problem that the current test and evaluation method in the background technology is difficult to verify whether the switchgear can meet the requirements of frequent operation during operation, the present invention provides a test and evaluation method and system for switchgear that frequently opens and closes capacitive current; The above method and system put forward the equivalent theoretical method for the number of opening and closing tests in the C2 level test and operating conditions, and take the standard C2 level test in the type test as a reference, combined with the number of operations required for field operation, design the C2 The level margin test is used to verify the safe operation performance of the switchgear. The test evaluation method of the switchgear that frequently opens and closes the capacitive current includes:

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