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Fault Identification Method Based on Current Half Cycle Absolute Value Integral Differential Type of Ratio Braking Characteristics

A technology of ratio braking characteristics and absolute value integration, which is applied in the direction of measuring electricity, electrical components, measuring electrical variables, etc., can solve problems such as complex judgment methods, poor reliability, and short fault component time

Active Publication Date: 2016-04-13
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems of short time, complex judging methods and poor reliability of the fault components in the existing differential protection measures mentioned in the background technology, the present invention proposes a current half cycle absolute value integral differential fault with ratio braking characteristic recognition methods

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  • Fault Identification Method Based on Current Half Cycle Absolute Value Integral Differential Type of Ratio Braking Characteristics
  • Fault Identification Method Based on Current Half Cycle Absolute Value Integral Differential Type of Ratio Braking Characteristics
  • Fault Identification Method Based on Current Half Cycle Absolute Value Integral Differential Type of Ratio Braking Characteristics

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Embodiment Construction

[0046] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0047] figure 1 It is an action characteristic diagram of the fault discrimination method of the ratio braking type current half cycle absolute value integral differential protection provided by the present invention. figure 1 The horizontal axis represents the braking current, and the vertical axis represents the operating current, and the unit of both is kiloampere (kA). The two-segment broken line in the first quadrant constitutes the boundary between the action area and the braking area of ​​the ratio brake fault identification method, and the broken line is completely determined by the minimum operating current ε, the braking coefficient f and the action equation. Among them, if the point described by the brakin...

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Abstract

The invention discloses a fault identification method for an electric current semi-cycle absolute value integral differential formula of ratio restrain characteristics, and belongs to the technical field of power system relay protection. On the basis of defining an electric current semi-cycle absolute value integral differential current and braking current, the fault identification method for the electric current semi-cycle absolute value integral differential protection of the ratio restrain characteristics is structured, setting principles of related definite values are given out, and the method for achieving the protection on sampling values utilizing a microcomputer is give out. The fault identification method for the electric current semi-cycle absolute value integral differential formula of the ratio restrain characteristics is simple, meets the requirements of sensitivity and reliability, and has strong practical values.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a current half-cycle absolute value integral differential fault identification method of a ratio braking characteristic. Background technique [0002] The principle of differential protection is based on Kirchhoff's current law. The protection principle is simple, not affected by system oscillation, and has natural phase selection ability. With the rapid development of new technologies such as computers, communications, and synchronous sampling, relay protection researchers have made full use of the advantages of new technologies such as data processing capabilities, logic computing capabilities, and data storage capabilities, and have improved and improved the specific implementation technologies of protection principles. Perfect to improve the overall performance of the protection and constantly explore new protection principles. Unde...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00G01R31/02H02H7/26
Inventor 戴志辉焦彦军
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)