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High-sampling-rate method for sampling value differential protection of multi-section type self-adaption transformer

A technology of differential protection and high sampling rate, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of unfavorable popularization and application, large motion blur area, low sensitivity, etc., and achieve high sensitivity, good quick action, and reliability sex high effect

Active Publication Date: 2014-02-12
NARI TECH CO LTD +1
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the traditional sampling value differential protection has problems such as large action ambiguity area and low sensitivity, which can only be used as a supplement to phasor differential protection with limited effect and is not conducive to popularization and application.

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  • High-sampling-rate method for sampling value differential protection of multi-section type self-adaption transformer
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  • High-sampling-rate method for sampling value differential protection of multi-section type self-adaption transformer

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Embodiment Construction

[0043] The present invention will be further described below in conjunction with the accompanying drawings.

[0044] The transformer sampling value differential protection proposed by the present invention includes two sections, one section is a fast section with fixed parameters, and the other section is a sensitive section with adaptive parameters. The way of logic OR gate, that is, if any one or both of the fast-acting section and the sensitive section are in action, the sampling value differential protection will trip; otherwise, the sampling value differential protection will not operate. The specific flow chart is as follows: figure 1 As shown, the implementation steps are as follows:

[0045] The first step is to perform high-speed sampling of the three-phase current on each side of the transformer, and the number of sampling points N for each power frequency cycle is not less than 40 points;

[0046] In the second step, a differential algorithm is performed on the cur...

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Abstract

The invention discloses a high-sampling-rate method for sampling value differential protection of a multi-section type self-adaption transformer. The method comprises the steps of performing high-speed sampling on three-phase currents on every side of the transformer; performing one-point difference algorithm processing on three-phase current sampling currents of every side of the transformer and compensating current amplitudes; calculating a sampling value differential current and a sampling value braking current of the transformer; performing logical discrimination of a sampling value differential protection quick-action section; performing logical discrimination of a sampling value differential protection sensitive section; and performing discrimination of sampling value differential total logic. According to the high-sampling-rate method for sampling value differential protection of the multi-section type self-adaption transformer, the problem that an existing sampling value differential protection method is large in action fuzzy area and low in sensitivity, the rapidity and the sensitivity are simultaneously met on the premise that the selectivity and the reliability are improved, and the method is good in application prospect.

Description

technical field [0001] The invention relates to a multi-stage self-adaptive high sampling rate transformer sampling value differential protection method suitable for a microcomputer protection device, which belongs to the technical field of relay protection of electric power systems. Background technique [0002] In the early 1990s, for the research on microcomputer relay protection in power system, in the traditional microcomputer transformer protection, conventional phasor differential protection has been widely used and has mature operation experience, but in the anti-excitation inrush current of transformer There are some defects in aspects such as CT saturation and CT saturation. In view of this phenomenon, in recent years, the concept of sampling value differential protection has been proposed. What we usually call sampled value differential protection is to differentially judge the discrete sampled values ​​collected by the microcomputer protection at each moment. It...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/045
Inventor 江卫良郝后堂史泽兵郑作伟顾志飞
Owner NARI TECH CO LTD
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