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基于零序导纳变化的灵活接地系统接地故障方向判别算法
Dicrimination Algorithm of Grounding Fault Direction Based on Variation of Zero-sequence Admittance in Flexible Grounding System
- 电力系统自动化-方正平台 2020年44卷第17期 页码：88-94
- 作者机构：
1.国网湖北省电力有限公司电力科学研究院，湖北省武汉市 430077
2.中国石油大学（华东）新能源学院，山东省青岛市 266580
3.山东科汇电力自动化股份有限公司，山东省淄博市 255087
- 作者简介：
杨帆(1982—)，男，博士，高级工程师，主要研究方向：配电运检及故障检测与诊断技术。E-mail：yangf_82@163.com
金鑫(1995—)，男，硕士研究生，主要研究方向：配电网接地故障检测与诊断。E-mail：jinxin@s.upc.edu.cn
沈煜(1983—)，男，硕士，高级工程师，主要研究方向：配电网运行分析、状态管控和智能化。E-mail：totoshenyu@163.com
薛永端(1970—)，男，通信作者，博士，教授，博士生导师，主要研究方向：配电网接地方式与接地故障自愈技术、配网自动化技术。E-mail：xueyd70@126.com
- 基金信息：国家自然科学基金资助项目(51477184)
DOI：10.7500/AEPS20191208002
中图分类号：收稿日期：2019-12-08，
修回日期：2020-05-04，
网络出版日期：2020-06-15，
纸质出版日期：2020-09-10
- 稿件说明：
移动端阅览
杨帆,金鑫,沈煜等.基于零序导纳变化的灵活接地系统接地故障方向判别算法[J].电力系统自动化,2020,44(17):88-94.
YANG Fan,JIN Xin,SHEN Yu,et al.Dicrimination Algorithm of Grounding Fault Direction Based on Variation of Zero-sequence Admittance in Flexible Grounding System[J].Automation of Electric Power Systems,2020,44(17):88-94.
杨帆,金鑫,沈煜等.基于零序导纳变化的灵活接地系统接地故障方向判别算法[J].电力系统自动化,2020,44(17):88-94. DOI： 10.7500/AEPS20191208002.
YANG Fan,JIN Xin,SHEN Yu,et al.Dicrimination Algorithm of Grounding Fault Direction Based on Variation of Zero-sequence Admittance in Flexible Grounding System[J].Automation of Electric Power Systems,2020,44(17):88-94. DOI： 10.7500/AEPS20191208002.
摘要
目前灵活接地系统的接地保护大多直接采用小电阻接地系统的定时限零序过电流保护，存在高阻接地时保护灵敏度不足以及故障信息利用不充分等问题。通过分析灵活接地系统发生单相接地故障时，并联小电阻投入前后故障点上、下游及健全线路的零序测量导纳特征，发现并联小电阻投入前后故障点下游及健全线路的零序测量导纳不变，模值比为1，而故障点上游线路零序测量导纳的模值比远大于1，基于此提出了基于零序导纳变化的灵活接地系统接地故障方向判别算法。数字仿真和现场试验数据表明，该方法准确率高，不易受线路参数和过渡电阻等因素影响，可与定时限零序过电流保护配合使用，能满足现场实用要求。
Abstract
At present
grounding fault protection of most flexible grounding system directly adopts the zero-sequence time-limit overcurrent protection of traditional low-resistance grounding system
which has problems including insufficient protection sensitivity and insufficient utilization of fault information when grounding via high-resistance. When single-phase grounding fault occurs in flexible grounding system
the characteristics of zero-sequence admittance measurement of healthy lines
upstream and downstream line of the fault point before and after switch-in of parallel small resistance are analyzed. It is found that the zero-sequence admittance measurement of healthy lines and the downstream line of the fault point remain unchanged
and the modulus ratio of admittance before and after switch-in of parallel resistance is 1
while the ratio of the upstream line of the fault point is much greater than 1. Based on this
a discrimination algorithm of grounding fault direction based on variation of zero-sequence admittance in flexible grounding system is proposed. Digital simulation and field experiment data show that this method has high accuracy
and it will not be easily affected by factors such as line parameters and transition resistance. The proposed method can be used in conjunction with zero-sequence time-limit overcurrent protection
which can meet practical field requirements.
关键词
Keywords
references
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