Detection device and method for distinguishing branches with capacitive or resistive instantaneous ground fault

Abstract

The invention discloses a detection device for distinguishing branches with a capacitive or resistive instantaneous ground fault. The device comprises an insulation monitoring device, a module monitoring device and a current transformer; the insulation monitoring device is connected with a positive bus, a negative bus of a direct current system and the ground respectively; the current transformeris connected with each branch of the direct current system; and the insulation monitoring device and the current transformer are both connected with the module monitoring device. The invention furtherdiscloses a detection method for distinguishing the capacitive and resistive instantaneous ground fault branches, the method comprises the steps of: the module monitoring device acquiring current data through the current transformer connected to the branch, locating a branch with the instantaneous ground fault according to a variation rule, and distinguishing whether a capacitive or a resistive instantaneous ground fault occurs on the branch circuit by combining with the information of the insulation monitoring device. According to the detection device and the method for distinguishing branches with the capacitive and resistive instantaneous ground fault, the branches with capacitive and resistive instantaneous ground fault can be rapidly and accurately detected and distinguished, and themethod can be widely applied to the field of power systems.

Description

technical field [0001] The invention relates to a DC system fault detection technology, in particular to a detection device and method for distinguishing capacitive and resistive instantaneous grounding fault branches. Background technique [0002] At present, during the operation of the substation DC power system, short-term ground faults often occur, that is, instantaneous ground faults, which affect the normal operation of the substation DC power system. In order to ensure the reliable operation of the DC power system of the substation, it is very necessary for the maintenance staff to discover and detect the branch circuits with potential failures in time. [0003] However, due to the short time of fault occurrence, the existing detection methods basically rely on manual operation, and most online insulation monitoring devices may not be able to detect the occurrence of faults, let alone support for instantaneous ground faults. Road judgment and positioning. Therefore,...

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Problems solved by technology

[0003] However, due to the short time of fault occurrence, the existing detection methods basically rely on manual operation, and most online insulation monitoring devices may not be able to detect the occurrence of faults, let alone support for instantaneous ground faults. Road judgment and positioning

Therefore, this will not only increase the workload of the staff, but also inefficiency

In addition, the existing detection methods cannot troubleshoot hidden troubles

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