[1]符金伟,史常凯,范闻博,等.采样频率对于配网故障指示器录波误差影响分析[J].电瓷避雷器,2020,(02):153-161.[doi:10.16188/j.isa.1003-8337.2020.02.025]
 FU Jinwei,SHI Changkai,FAN Wenbo,et al.Influence of Sampling Frequency on Recording Error of Distribution Network Fault Indicator[J].,2020,(02):153-161.[doi:10.16188/j.isa.1003-8337.2020.02.025]
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采样频率对于配网故障指示器录波误差影响分析()
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《电瓷避雷器》[ISSN:1006-6977/CN:61-1281/TN]

卷:
期数:
2020年02期
页码:
153-161
栏目:
避雷器
出版日期:
2020-04-25

文章信息/Info

Title:
Influence of Sampling Frequency on Recording Error of Distribution Network Fault Indicator
作者:
符金伟1 史常凯1 范闻博1 李柏奎1 刘 鹏2 赵子敬2
(1.中国电力科学研究院有限公司,北京100192; 2.郑州大学电气工程学院,郑州450001)
Author(s):
FU Jinwei1 SHI Changkai1 FAN Wenbo1 LI Baikui1 LIU Peng2 ZHAO Zijing2
(1.China Electric Power Research Institute, Beijing 100192, China; 2.College of Electrical Engineering,Zhengzhou 450001,China.)
关键词:
故障指示器 录波装置 采样频率 暂态零序电流峰值 故障条件
Keywords:
fault indicator wave recording device sampling frequency transient zero sequence current peak fault condition
DOI:
10.16188/j.isa.1003-8337.2020.02.025
摘要:
录波装置采样频率是影响配网故障指示器采集波形准确性的关键指标,定量分析采样频率造成的录波误差是提高小电流接地系统单相接地故障选线和定位的准确性的基础。本文采用Matlab建立具有五回出线的10 kV配网小电流接地系统模型; 计算单相接地故障时,录波装置不同采样频率对应的零序电流录波暂态误差; 并分析不同接地过渡电阻、故障点距离、故障时刻相角等因素下,录波装置采样频率对零序电流录波暂态误差的影响规律。计算结果表明,随着过渡电阻的提高,采样频率所造成的幅值误差也相应增大; 当过渡电阻为1 kΩ时,采样频率需达到6 kHz,暂态录波误差低于10%。故障点距离母线越近,采样频率不同造成暂态误差越大; 故障点距离母线4 km以内时,采样频率需达到6 kHz,暂态录波误差低于10%。随着故障相位角的增加,暂态录波误差越大,当采样频率达到3 kHz时,任意故障相角下暂态零序电流峰值误差能够降到10%以内。结合国家电网配电线路故障指示器入网检测大纲故障录波暂态性能中最大峰值瞬时误差应不大于10%的要求,建议配网故障指示器采样频率达到6 kHz及以上。
Abstract:
The sampling frequency of the recording device is a key index that affects the waveform acquisition accuracy of the fault indicator of the distribution network. In this paper, Matlab is used to establish the model of 10 kV distribution network small current grounding system with five-loop outgoing lines. The transient errors of zero-sequence current recording corresponding to different sampling frequencies are calculated for single-phase earth fault. The influence of sampling frequency of recording device on transient error of zero-sequence current recording is analyzed under different grounding transition resistance, fault point distance and fault time phase angle. The results show that the amplitude error caused by sampling frequency increases with the increase of transition resistance. When the transition resistance of 1 kΩ sampling frequency should be 6 kHz, transient wave record error is less than 10%. The closer the fault point is to the bus, the bigger the transient error will be due to different sampling frequency. When the fault point is within 4 km from the bus, the sampling frequency should reach 6 kHz and the transient recording error should be less than 10%. With the increase of the fault phase angle, the transient recording error increases. When the sampling frequency reaches 3 kHz, the peak value error of the transient zero-sequence current at any fault phase angle can be reduced to less than 10%. In accordance with the demands specified innational grid power distribution line fault indicator program, the transient performance offault wave recording should be no greater than 10% of the maximum error of the instantaneous peak; It is recommended that the distribution network fault indicator reaches 6 kHz sampling frequency and above.

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备注/Memo

备注/Memo:
收稿日期:2019-10-23作者简介:符金伟(1988—),女,硕士,工程师,电力系统自动化
更新日期/Last Update: 2020-04-25