Method, device and system for testing capacitive current

Abstract

The invention provides a capacitance current testing method, device and system. The method comprises the steps that a testing terminal of a voltage output module of the capacitance current testing device is electrically connected with an a phase terminal of an electrified indicating device of a switch cabinet, and an earth terminal of the voltage output module of the capacitance current testing device is electrically connected with an earth terminal of the electrified indicating device of the switch cabinet; a pilot frequency voltage signal is output; a testing module acquires a phase currentof the voltage output module; the testing terminal of the voltage output module of the capacitance current testing device is respectively and electrically connected with a b phase terminal and c phaseterminal of the electrified indicating device of the switch cabinet, and b phase current and c phase current of the voltage output module are respectively acquired; direct earth capacitance of each phase is calculated; and direct earth capacitance current is calculated according to the direct earth capacitance of each phase. The capacitance current testing method, device and system have the advantages that a test loop is simple, the direct earth capacitance of each phase of a power system can be respectively calculated, power failure is not needed, and the safety is high. The capacitance current testing method, device and system are applied to the capacitance current test of different earth-free systems.

Description

technical field [0001] The present disclosure relates to the technical field of electric power systems, in particular to a method, device and system for testing capacitive current. Background technique [0002] In the neutral point ungrounded system, when the line is single-phase grounded, the current flowing through the fault point is the capacitive current generated by the line-to-ground capacitance. Most of the faults in the neutral point ungrounded system are caused by the excessive capacitive current when the line is single-phase grounded, and the arc is not easy to self-extinguish. my country's power system stipulates that when the capacitive current of the 10kV and 35kV systems is greater than 30A and 10A, an arc suppression coil should be installed to compensate the capacitive current. In order to determine the compensation capacity of the arc suppression coil, a capacitive current test should be carried out. In addition, in order to verify whether ferromagnetic res...

AI Technical Summary

Problems solved by technology

[0004] Embodiments of the present invention provide a capacitive current testing method, device and system to solve the problems of cumbersome operation and poor safety in the prior art

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