A Differential Protection Method Based on Positive Sequence Admittance

A differential protection and admittance technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as protection function dependence and time system limitations, and achieve good adaptability, good selectivity, and high sensitivity Effect

Active Publication Date: 2018-02-16
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a differential protection method based on positive sequence admittance to solve the limitation that the protection function depends on the time synchronization system when the protection device accesses the sampling value in a networking manner

Method used

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  • A Differential Protection Method Based on Positive Sequence Admittance
  • A Differential Protection Method Based on Positive Sequence Admittance
  • A Differential Protection Method Based on Positive Sequence Admittance

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Embodiment Construction

[0016] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0017] Since the positive-sequence admittance of each interval is calculated from the voltage and current from the same MU, the synchronization of the voltage and current of a single interval is guaranteed, that is, the correctness of the magnitude and direction of the positive-sequence admittance measured by it is guaranteed; since the system is in normal operation Or fault operation, its positive sequence voltage and current are basically stable, so the measured positive sequence admittance of each branch is basically stable, only in the transition process from the normal state to the fault state when the fault occurs The measured positive-sequence admittance is variable, so the correctness of the protection action can be ensured by avoiding the measurement time window when the system operating state transitions through delay confirmation i...

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Abstract

The invention relates to a positive sequence admittance-based differential protection method, and belongs to the technical field of relay protection of electric power engineering. According to the positive sequence admittance-based differential protection method, whether a protected object is broken down or not is identified according to positive sequence admittances of branches of the protected object and the size and direction characteristics of Y<cd>; when the positive sequence admittances of the protected object and the Y<cd> are greater than a set value and the Y<cd> and the admittances of the projected object are in-phase, a fault is judged as an internal fault; and an action is protected after time constant value delay is conformed, so that a differential protection on the protected equipment is achieved. A handclap can be reliably identified according to the principle that the positive sequence admittances of the branches and the size of the Y<cd> are significantly different when the system normally runs and the system is broken down, so that the positive sequence admittance-based differential protection method has the advantages of good selectivity, high sensitivity, high reliability and good adaptivity.

Description

technical field [0001] The invention relates to a differential protection method based on positive sequence admittance, which belongs to the technical field of electric power engineering relay protection. Background technique [0002] The sampling value data (SV) between the process layer devices of the smart substation adopts the DL / T860.92 (IEC61850-9-2) protocol point-to-point or networking transmission mode, although the networking transmission mode conforms to the networked and multi-interval information of the smart substation Sharing and simplifying the process layer network structure and other development directions, but the synchronization of SVs at different intervals depends on the time synchronization system. Since the protection device is not required to rely on the external time synchronization system to realize its protection function, the protection function of the relay protection device is limited when the SV is obtained by networking, so it is very necessa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 刘星孟乐胡宝李俊刚朱若松薛建民冯林涛郭晓宁崔龙卫常彦彦胡源奇
Owner STATE GRID CORP OF CHINA
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