Test loop used for direct-current switch test

Abstract

The invention relates to a test loop for a direct-current switch test. The test loop comprises a current source and a test circuit part connected with the current source, wherein the current source consists of a low-frequency oscillating loop, a closing switch, a lightning arrester and a protection ball; the output end of the low-frequency oscillating loop is connected with the closing switch andthe lightening arrester to form a loop; one end of the protection ball is connected with the high potential of the output end of the low-frequency oscillating loop through the closing switch; the other end of the protection ball is connected with the low potential of the output end of the low-frequency oscillating loop; and the test circuit part consists of a direct test loop and a synthetic testloop. The invention discloses the test loop for a direct-current switch, namely two test loops are united to examine the cut-off performance of the direct-current switch to be tested. The interactioncapacity of an electric arc and an auxiliary loop of the direct-current switch and the arc-extinguishing capacity under high critical rate of rise of on-state current (di / dt) are examined directly. The synthetic test examines the recovery voltage bearing capacity of the direct-current switch after a current is cut off.

Description

technical field [0001] The invention belongs to the technical field of high-voltage direct current switch test for direct current transmission, and relates to a test loop for detecting breaking performance of a direct current switch, in particular to a test loop for breaking or converting direct current of a direct current switch. Background technique [0002] The DC circuit breaker is one of the important equipment in the converter station of the UHV DC transmission project. Its main function is to change the operation mode of the DC system or to clear the faults on the DC side, that is, when the system fails, use the DC switch to break or Convert DC current. In order to prove that the DC switch has this ability, test its breaking performance in the laboratory. [0003] The test circuit for DC switch breaking performance detection is a circuit that simulates the actual operating conditions of the DC switch in the system. The test current can be obtained by rectifying the p...

AI Technical Summary

Problems solved by technology

[0003] The test circuit for DC switch breaking performance detection is a circuit that simulates the actual operating conditions of the DC switch in the system. The test current can be obtained by rectifying the power grid or the generator. Since the DC switch has to withstand high voltage after breaking the current, the DC power supply The voltage must reach the required voltage value, so to build such a test circuit, the investment is very large

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