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Method to prevent non-faulty phase bus differential protection from misoperation during line reclosing

A technology of bus differential protection and reclosing, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as non-faulty phase bus differential protection misoperation, non-faulty phase bus differential protection misoperation, etc., to avoid protection misoperation , to avoid the effect of impact

Active Publication Date: 2016-01-20
STATE GRID CORP OF CHINA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the above problems and provide a method for preventing misoperation of non-faulty phase busbar protection during line reclosing, which effectively solves the problem of misoperation of non-faulty phase busbar protection during line reclosing

Method used

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  • Method to prevent non-faulty phase bus differential protection from misoperation during line reclosing
  • Method to prevent non-faulty phase bus differential protection from misoperation during line reclosing
  • Method to prevent non-faulty phase bus differential protection from misoperation during line reclosing

Examples

Experimental program
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Effect test

Embodiment

[0028] Embodiment: (taking 110kV Dongcheng Substation as an example)

[0029] The present invention analyzes the examples of solving misoperation of non-faulty phase busbar protection during line reclosing, and demonstrates the detection method for finding faults, determining the cause of misoperation of non-faulty phase busbar protection, and establishing a reasonable index system work done.

[0030] 110kV Dongcheng substation line 8.4km single-phase ground short circuit occurs, when the line circuit breaker recloses to a permanent fault, the secondary current waveform of the line is seriously distorted, which leads to II differential protection malfunction, resulting in power outage of substation II bus Major accident. The occurrence of the fault not only cuts off the equipment and interrupts the normal power generation and power supply work, but also has a very serious impact on the safe and stable operation of the local power grid.

[0031] After the fault occurred, a la...

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Abstract

The invention relates to a method for preventing healthy phase bus-bar differential protection mal-operation during a circuit reclosing period. The method comprises one of the following measures: (1), optimizing secondary system indexes for changing TA for the bus into 5P20, and enabling a value TA which is 8 times of the rated current to be far from 10% of error curve edge; (2), arranging a high-low constant value action area for differential protection; (3), adding harmonic restraining criteria to take up anti-saturation measures in logic and adding the harmonic restraining criteria, wherein the harmonic restraining coefficient is less than 0.1; and (4), and replacing power frequency differential logic by power frequency variable differential logic when the added power frequency variable comprehensive criterion bus generates external faults.

Description

technical field [0001] The invention relates to a method for preventing misoperation of non-faulty phase bus difference protection during line reclosing, and belongs to the technical field of electric power system relay protection. Background technique [0002] In recent years, the 110kV Dongcheng Substation, Qingdao Power Plant, etc. have experienced several single-phase ground short circuits. When the line circuit breaker overlaps to a permanent fault, the bus differential or line differential protection operates, and the circuit breaker trips, resulting in a large area of ​​equipment. In the case of a major power outage, the occurrence of the fault not only cuts off the relevant equipment, but also affects the stable operation of the power grid. [0003] For example, a single-phase ground short circuit occurred in the 110kV Dongcheng substation line. When the line circuit breaker reclosed to a permanent fault, the secondary current waveform of the line was seriously disto...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/22H02H7/26
Inventor 张青青苏治韦良付燕荣
Owner STATE GRID CORP OF CHINA
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