A method and system for relay protection from surge disturbance

A technology of relay protection and protection action, which is applied in the direction of emergency protection circuit devices, parts of emergency protection devices, electrical components, etc., can solve problems such as economic losses, affecting power supply and production safety, power failure accidents, etc., and achieve improved wave resistance The ability to surge disturbance, significant practical significance, and the effect of enhancing reliability

Inactive Publication Date: 2019-01-15
清能华控科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Surge disturbance may affect the analog quantity sampling of the relay protection device, causing the abnormal mutation of the sampling data. If the necessary processing is not carried out, it will affect the calculation of the effective value of the analog quantity, which may lead to the relay protection based on the effective value judgment. Misoperation, causing power outage accidents, affecting power supply and production safety, resulting in serious consequences such as major economic losses
However, for protection malfunctions that may be caused by surge disturbances, the method of increasing the fixed value of the inherent time is often used to deal with it. Although the reliability of the relay protection device is enhanced, the quick action is lost.

Method used

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  • A method and system for relay protection from surge disturbance

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Experimental program
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Effect test

Embodiment 2

[0053] Preferred embodiment 2, a system for relay protection to avoid surge disturbance, including:

[0054] Cache module: cache sampled data in real time. In this example, the cache length is 20 sampled data.

[0055]Judgment module: judge that the sampled data is disturbed. Take out the latest three sampling data in turn, and record them as P1, P2 and P3 respectively; calculate the variation of the sampling value V21 and V32, where V21=P2-P1, V32=P3-P2; if the signs of V21 and V32 are opposite, and both If the absolute values ​​are greater than the preset sample value variation threshold, then the sampled data P2 is considered to be abnormal; otherwise, the sampled data P2 is considered to be normal.

[0056] Correction module: Correction of disturbed data. When the sampling data P2 is abnormal, calculate the mean value Pa=(P1+P3) / 2, and replace P2 with Pa.

[0057] Full-wave Fourier algorithm module: use full-wave Fourier algorithm to calculate the effective value and ma...

Embodiment 3

[0060] Preferred embodiment three, a computer program for implementing a method for relay protection to avoid surge disturbance, the method for relay protection to avoid surge disturbance includes the following steps:

[0061] Step 1: Cache the sampling data in real time, and the cache length should not be less than 20ms.

[0062] Step 2: Judging that the sampled data is disturbed. Take out the latest three sampling data in turn, and record them as P1, P2 and P3 respectively; calculate the variation of the sampling value V21 and V32, where V21=P2-P1, V32=P3-P2; if the signs of V21 and V32 are opposite, and both If the absolute values ​​are greater than the preset sample value variation threshold, then the sampled data P2 is considered to be abnormal; otherwise, the sampled data P2 is considered to be normal.

[0063] Step 3: Correction of disturbed data. When the sampling data P2 is abnormal, calculate the mean value Pa=(P1+P3) / 2, and replace P2 with Pa.

[0064] Step 4: Us...

Embodiment 4

[0067] Preferred Embodiment 4. An information and data processing terminal implementing a method for relay protection to avoid surge disturbance. The method for relay protection avoiding surge disturbance includes the following steps:

[0068] Step 1: Cache the sampling data in real time, and the cache length should not be less than 20ms.

[0069] Step 2: Judging that the sampled data is disturbed. Take out the latest three sampling data in turn, and record them as P1, P2 and P3 respectively; calculate the variation of the sampling value V21 and V32, where V21=P2-P1, V32=P3-P2; if the signs of V21 and V32 are opposite, and both If the absolute values ​​are greater than the preset sample value variation threshold, then the sampled data P2 is considered to be abnormal; otherwise, the sampled data P2 is considered to be normal.

[0070] Step 3: Correction of disturbed data. When the sampling data P2 is abnormal, calculate the mean value Pa=(P1+P3) / 2, and replace P2 with Pa.

...

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Abstract

The invention discloses a method and a system for relay protection to avoid surge disturbance, belonging to the technical field of power system relay protection. The data damaged by surge disturbanceis judged and corrected to eliminate adverse effects. At least comprise that following step: step 1: real-time buffering sampling data; The cache length shall not be less than 20ms; 2, jud that disturbed sample data; 3, correct that disturbed data; 4, calculate that effective value by adopting a full-wave Fourier algorithm and jud the protection logic; 5, calculate that effective value by adoptinga half-wave Fourier algorithm and judging the protection logic; Step 6: Judge the protection action. By adopting the technical proposal, the invention improves the ability of the relay protection device to resist the surge disturbance, and simultaneously enhances the reliability and the speed of the relay protection device.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a method and system for relay protection to avoid surge disturbance. Background technique [0002] Surge disturbance may affect the analog quantity sampling of the relay protection device, causing the abnormal mutation of the sampling data. If the necessary processing is not carried out, it will affect the calculation of the effective value of the analog quantity, which may lead to the relay protection based on the effective value judgment. Misoperation, causing power outage accidents, affecting power supply and production safety, resulting in serious consequences such as major economic losses. However, for protection malfunctions that may be caused by surge disturbances, the method of increasing the fixed value of the inherent time is often used to deal with it. Although the reliability of the relay protection device is enhanced, the qu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H1/04
CPCH02H1/04
Inventor 尹明铉成怀宁杨新超
Owner 清能华控科技有限公司
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