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Method, device and system for testing capacitive current

A capacitive current and testing device technology, applied in the field of power systems, can solve problems such as cumbersome operation and poor safety

Active Publication Date: 2020-02-07
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method, device and system for testing capacitive current
  • Method, device and system for testing capacitive current

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Embodiment Construction

[0032] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described The embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0033] Please refer to Figure 1-4 , which are the electrical wiring diagram of a capacitive current testing system based on the live indicator device of the switchgear provided in the embodiment of the present application, the electrical equivalent circuit diagram of A relative to ground capacitance measurement, and the electrical equi...

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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 of thecurrent 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; electrically connecting the grounding terminal o of the capacitive current testing device with the grounding terminal of the switch cabinet electrified indication device; electrically connecting a current transformer of each phase between the capacitor of a corresponding electrified indication sensor and the capacitor of a switch cabinet electrified display device; outputting an abnormal-frequency current signal; acquiring an abnormal-frequency voltage and an abnormal-frequency current corresponding to each phase of the an abnormal-frequency current signal; calculating the ground capacitance of each phase ofa neutral point ungrounded system; according to the ground capacitance of each phase, calculating to obtain the ground capacitance current. According to the invention, 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 condition of power outage is not required and the safety is high. The methodcan 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/52G01R19/00
CPCG01R19/0092G01R31/50
Inventor 刘红文王科李昊
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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