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Method for detecting correctness of sampling value of electronic transformer

An electronic transformer and detection method technology, applied in instruments, measuring devices, measuring electrical variables, etc., can solve the problems of slow protection action, protection refusal, wrong setting, etc., to ensure the safety of the power grid, high reliability, The effect of improving reliability

Active Publication Date: 2014-01-29
长园深瑞继保自动化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest problem of voltage blocking is that the threshold of voltage criterion is not easy to choose, and the wrong setting may even cause the protection to refuse to operate; some people suggest to use waveform symmetry detection to judge the symmetry of the positive and negative half cycles of the current to detect whether the current is normal
This method is similar to the traditional detection method of transformer excitation inrush current, and its biggest disadvantage is that it leads to slower protection action

Method used

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  • Method for detecting correctness of sampling value of electronic transformer
  • Method for detecting correctness of sampling value of electronic transformer
  • Method for detecting correctness of sampling value of electronic transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Example 1, Sichuan Nanta 110kV digital substation system, using the ISA-300GO microcomputer relay protection device of Shenzhen Nanrui Technology Co., Ltd., the microprocessor of the relay protection device uses standard C language, and the software version is V1.05. The OPCT16-JFCBZW-110 electronic transformer of Zhuhai Chengrui Electric Co., Ltd. adopts the PRS-7390-1 combination unit of Shenzhen Nanrui Technology Co., Ltd.

[0073] The order for the microprocessor to calculate the difference between sampling current values:

[0074] k=(gRam_optiSam.SamDataExtractPnt*SAM_INTER_OPTI+gRam_optiSam.Dx_optiSamInter+gRam_fr.sam_interval)%(SAM_INTER_OPTI*CN_MUsamDataRec);

[0075] gRam_optiSam.Dx_optiSamInter = k% SAM_INTER_OPTI;

[0076] gRam_optiSam.SamDataExtractPnt = k / SAM_INTER_OPTI;

[0077] PntNext=(gRam_optiSam.SamDataExtractPnt+1)%(CN_MUsamDataRec);

[0078] fx1=(float)gRam_optiSam.Dx_optiSamInter / SAM_INTER_OPTI;

[0079] fx2=1.0-fx1;

[0080] gRam_optiSam.samD...

Embodiment 2

[0147] Embodiment 2, Shandong Baifenzi digital substation system, adopts the ISA-300GO microcomputer relay protection device of Shenzhen Nanrui Technology Co., Ltd., the microprocessor of the relay protection device uses standard C language, and the software version is V1.06. The OPCT16-ZFCBZW-35 combined transformer of Zhuhai Chengrui Electric Co., Ltd. adopts the PRS-7394 combination unit of Shenzhen Nanrui Technology Co., Ltd.

[0148] The order for the microprocessor to calculate the difference between sampling current values:

[0149] k=(gRam_optiSam.SamDataExtractPnt*SAM_INTER_OPTI+gRam_optiSam.Dx_optiSamInter+gRam_fr.sam_interval)%(SAM_INTER_OPTI*CN_MUsamDataRec);

[0150] gRam_optiSam.Dx_optiSamInter = k% SAM_INTER_OPTI;

[0151] gRam_optiSam.SamDataExtractPnt = k / SAM_INTER_OPTI;

[0152] PntNext=(gRam_optiSam.SamDataExtractPnt+1)%(CN_MUsamDataRec);

[0153] fx1=(float)gRam_optiSam.Dx_optiSamInter / SAM_INTER_OPTI;

[0154] fx2=1.0-fx1;

[0155] gRam_optiSam.samData...

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Abstract

The invention discloses a method for detecting the correctness of a sampling value of an electronic transformer and aims to solve the technical problem of the improvement of relay protection reliability. The method comprises the following steps that: the electronic transformer transmits the current value of a sampling point in a cyclic wave of a load current channel to a relay protection device; and a microprocessor performs difference calculation on the sampling current value, calculates the current alternating current component amplitude of a sampling point in a current period, calculates the ratio of a maximum sampling value of all sampling values obtained by difference calculation on all sampling points in a period to the calculated alternating current component amplitude of the current period and judges that the sampling value of the electronic transformer is correct when the ratio is less than 2. Compared with the prior art, the method judges the correctness of the sampling value by comparing the relation between a current sampling difference value and a calculated amplitude, so that the method has the characteristics of high reliability and no influence on the speed of relay protection action, basis is provided for relay protection, the reliability of relay protection is enhanced and the safety of a power grid is ensured.

Description

technical field [0001] The invention relates to a method for relay protection of a power system, in particular to a method for relay protection of a digital substation. Background technique [0002] With the development of smart grid, more and more digital substations are used. One of the main differences between digital substations and conventional substations is that digital substations use electronic transformers ECT to replace traditional electromagnetic transformers. In the process of applying ECT in the substation, under the interference of the on-site electromagnetic environment, ECT will occasionally output abnormal data. The direct impact of abnormal data is to cause incorrect action behavior of relay protection and reduce the reliability of power supply. Therefore, during the application of digital substation, the relay protection should deal with the possible abnormal data generated by ECT, so as to improve the reliability of relay protection. In the enterprise...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/02
Inventor 许永军李蔚凡陈锐
Owner 长园深瑞继保自动化有限公司
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