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Indication method and device of short circuit and ground fault of power distribution network

A technology of line short circuit and ground fault, applied in the fault location, measuring device, measuring electricity and other directions, can solve the problem of low correct action rate, and achieve the effect of improving the correct action rate, improving the reliability of power supply, and judging direct and reliable

Inactive Publication Date: 2008-12-10
福建省福州电业局
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Problems solved by technology

This kind of fault judgment device, especially for the distribution network system with arc suppression coil installed at the neutral point, has a low correct action rate of the product

Method used

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  • Indication method and device of short circuit and ground fault of power distribution network
  • Indication method and device of short circuit and ground fault of power distribution network
  • Indication method and device of short circuit and ground fault of power distribution network

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with embodiment accompanying drawing

[0021] figure 1 Among them, C is a current sensor, V is a voltage sensor, X is a current signal converter, Y is a voltage signal converter, P is a current transient starting circuit, N is a voltage transient starting circuit, M is a single-chip microcomputer control system, D is Fault indication circuit, S is the power supply circuit. The connection relationship is that the magnetic circuit of the CT-type current sensor C surrounds a certain wire of the overhead line of the distribution network, and the current signal of the wire output by the secondary winding is connected to the input terminal of the current signal converter X, and the current signal converter X Convert the sampled current signal into a voltage signal acceptable to the single-chip control system M, and send it to the A / D channel 1 of the single-chip control system M, the input terminal Vx of th...

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Abstract

The invention discloses a method and a device for indicating the short circuit of lines and earth fault of distribution network. The method provided by the invention is the method which adopts the instantaneous variation of current and voltage to start circuits. The device provided by the invention is the device which adopts the instantaneous variation of current and voltage to start circuits. The method and the device provided by the invention have the advantages that the technical proposal that the instantaneous variation of current and voltage is used to start circuit can improve the rate of the correct action of the device and shorten the failure searching time, thereby improving the reliability of the power supply of the distribution network system. The invention provides the method for directly measuring the overhead line to earth voltage, so that the earth fault of lines can be distinguished more directly and reliably.

Description

technical field [0001] The invention relates to a detection method and device for an electric power system, in particular to an indication method and an indication device for indicating a short circuit and a grounding fault of a distribution network line. Background technique [0002] In the 10kV distribution network power system, short-circuit and ground faults are the main faults of the distribution network lines. These faults affect the system and cause a certain range of power outages. If the fault can be detected and repaired in time in the system, the downtime of the faulty equipment will be shortened, and the operating efficiency and power supply reliability will be improved. At present, there have been discussions on short-circuit and ground fault indicators, such as the patent ZL99122276.8 single-phase ground fault display method of power supply line and the instrument used, which introduces the method of comparing the grounding instant capacitive current and the fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02G01R31/08
Inventor 叶丹
Owner 福建省福州电业局
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