Direct current test system and test voltage acquisition method

Abstract

The invention discloses a DC test system and a test voltage acquisition method, and the DC test system comprises a primary system and a secondary system. The primary system comprises a high-voltage alternating-current isolating switch QS, an opening high-voltage alternating-current circuit breaker QF1, a closing high-voltage alternating-current circuit breaker QF2, a step-down transformer, a rectifier cabinet, a series-parallel conversion unit, a pre-stage impedance unit, a low-voltage direct-current circuit breaker QF3, a test station and a post-stage impedance unit which are sequentially connected in series, and the tail end of the post-stage impedance unit is grounded; the rectifier cabinet rectifies an input alternating current power supply into a direct current power supply and outputs the direct current power supply to the low-voltage direct current circuit breaker QF3, two sides of the low-voltage direct current circuit breaker QF3 are respectively connected with the secondary system through optical fibers, and the front end of the data acquisition system acquires test voltage signals in the period from closing of the closing high-voltage alternating current circuit breaker QF2 to closing of the low-voltage direct current circuit breaker QF3 through optical fibers. And the voltage signals are transmitted to the data acquisition system host and the industrial personal computer for signal identification, processing and display.

Description

technical field [0001] The invention relates to the technical field of switching electrical appliances detection, in particular to a DC test system and a test voltage collection method. Background technique [0002] In recent years, with the development of DC transmission technology and distributed energy, the advantages of DC power supply have become more prominent, which has further promoted the development of DC electrical appliances. Various switching appliances such as DC circuit breakers, DC contactors, and DC fuses have been used in DC. system. Short-circuit test, on-off test, and electrical life test are important type tests for DC switching devices. In DC tests, voltage, current, and time constant are important test parameters. Among them, the current can be collected by shunts, Hall sensors, etc., and the time constant can be Calculated and read out in waveform graph. Since there is no DC circuit breaker with high breaking capacity, the capacity of the low-voltag...

AI Technical Summary

Problems solved by technology

Because there is no DC circuit breaker with high breaking capacity, the capacity of the low-voltage closing switch is insufficient, and it is impossible to independently control the on and off of the test power supply. In the large-capacity DC test, the power supply cannot be directly controlled on the DC side. The AC side controls the power on and off, which makes it relatively difficult to realize the voltage acquisition in the DC test

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