Limit condition test system of alternating current switching device

Abstract

The invention discloses a limit working condition test system for an alternating current switching device, belongs to the technical field of industrial test equipment, and solves the problems of large power grid impact, high cost and low control precision of the conventional test system during the limit working condition test of the alternating current switching device. When the bidirectional direct current power supply works in the forward direction, the super capacitor C is charged, the super capacitor C provides a direct current side power supply for the DC / AC alternating current power supply for inversion, power supply characteristics of a power grid are simulated, on and off of the first switch K1 and the second switch K2 are controlled through the main control unit, and the electrical life, connection fault current and bearing short-circuit current of an alternating current switching device are tested. The device is completely disconnected with the power grid in the testing process under the limit working condition, has no impact on the power grid, provides a safe and reliable testing environment, meets the safety test under the condition of low power grid capacity, does not need a power grid special line, is low in cost, and solves the problem of limitation of the testing environment.

Description

technical field [0001] The invention belongs to the technical field of industrial testing equipment, and relates to an extreme working condition testing system of an AC switching device. Background technique [0002] AC electrical switches, such as AC relays, AC contactors, AC circuit breakers and other switching devices, are widely used in various industrial fields. The traditional testing method of AC electrical switches is to use the power grid to directly provide the AC test environment, through the way of power grid dedicated lines Take power directly, add AC voltage regulator and resistance-inductive load for testing, and use switches and fuses to achieve hard shutdown under live conditions. [0003] For switching devices such as AC relays, AC contactors, and AC circuit breakers, the arc extinguishing ability of the contacts of the switching device under test, the connection test performance under fault current, and the withstand capacity under short-circuit current ar...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to design a test system for extreme working conditions of AC switching devices, so as to solve the problems of the existing test system, such as large impact on the power grid, high cost and low control precision.

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