Method, device and system for testing capacitive current

Abstract

The invention provides a method, a device and a system for testing the capacitive current. The method comprises the following steps: respectively and electrically connecting the test terminals m of the current output module of a capacitive current testing device with the a-phase terminal, the b-phase terminal and the c-phase terminal of a switch cabinet electrified indication device; electricallyconnecting the grounding terminal o of the current output module of the capacitive current testing device with the grounding terminal of the switch cabinet electrified indication device; controlling the high-frequency voltage module of the capacitive current testing device to output an abnormal-frequency current signal; acquiring the abnormal-frequency voltage of the current output module of the capacitive current testing device under the abnormal-frequency current; according to the abnormal-frequency current signal and the abnormal-frequency voltage of the current output module under the abnormal-frequency current, calculating to obtain the total ground capacitance of a neutral point ungrounded system; and calculating to obtain the ground capacitive current according to the total ground capacitance. According to the method, the test loop is simple. The ground capacitance of each phase of the power system, relative to the ground, can be calculated respectively. Meanwhile, the conditionof power outage is not required and the safety is high. The method can be used for testing the capacitive currents of ungrounded 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

Images