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仅利用零序电流的谐振接地系统接地故障方向算法
Grounding Fault Direction Algorithm Using Zero-sequence Current in Resonant Grounding System
- 电力系统自动化-方正平台 2020年44卷第9期 页码：164-170
- 作者机构：
1.中国石油大学（华东）新能源学院，山东省青岛市 266580
2.国网江西省电力有限公司南昌供电分公司，江西省南昌市 330000
3.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
4.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：
金鑫(1995—)，男，硕士研究生，主要研究方向：配电网故障检测与诊断。E-mail：jinxin@s.upc.edu.cn
薛永端(1970—)，男，通信作者，教授，博士生导师，主要研究方向：配电网自动化及其故障检测、智能电网自愈技术。E-mail：xueyd70@126.com
彭振华（1972—），男，硕士，高级工程师，主要研究方向：配电网自动化、智能电网技术应用。E-mail：pengzh3398@163.com
- 基金信息：国家自然科学基金资助项目(51477184)
DOI：10.7500/AEPS20190319001
中图分类号：收稿日期：2019-03-19，
修回日期：2019-09-06，
网络出版日期：2020-04-01，
纸质出版日期：2020-05-10
- 稿件说明：
移动端阅览
金鑫,薛永端,彭振华等.仅利用零序电流的谐振接地系统接地故障方向算法[J].电力系统自动化,2020,44(9):164-170.
JIN Xin,XUE Yongduan,PENG Zhenhua,et al.Grounding Fault Direction Algorithm Using Zero-sequence Current in Resonant Grounding System[J].Automation of Electric Power Systems,2020,44(9):164-170.
金鑫,薛永端,彭振华等.仅利用零序电流的谐振接地系统接地故障方向算法[J].电力系统自动化,2020,44(9):164-170. DOI： 10.7500/AEPS20190319001.
JIN Xin,XUE Yongduan,PENG Zhenhua,et al.Grounding Fault Direction Algorithm Using Zero-sequence Current in Resonant Grounding System[J].Automation of Electric Power Systems,2020,44(9):164-170. DOI： 10.7500/AEPS20190319001.
摘要
由于多数终端难以获得零序电压或三相电压信号，限制了暂态功率方向法在小电流接地故障定位、多级保护、分界技术的应用。分析了谐振接地系统单相接地时故障点上游与下游的零序电流工频分量、暂态主谐振分量以及衰减直流分量与故障初相角的关系，发现可利用零序电流工频分量作为零序电压的极化相量，进一步识别故障方向。当零序电流工频分量初相位分别在(－45°
75°)或(135°
255°)以内，暂态主谐振分量初相位分别在(－30°
30°)或(150°
210°)以内时
或者衰减直流分量与工频分量幅值之比大于预设门槛时，故障方向为正，否则故障方向为负。仿真和现场实际故障数据验证了算法的正确性。
Abstract
Most distribution terminals are difficult to obtain zero-sequence voltage or three-phase voltage signals. So the application of transient power direction method in fault location
multi-level protection and demarcation of single-phase grounding fault in resonant grounding system is limited. The relationship of the initial phase angle with different components of zero-sequence current of fault points on upstream and downstream
with single-phase grounding fault in resonant grounding system
is analyzed. The components could be power frequency component
transient main resonance component or decaying DC component. It is found that the power frequency component of zero-sequence current can be used as the polarization phasor of the zero-sequence voltage
to further identify the fault direction using zero-sequence current only. The fault direction is positive
when the phase of power frequency component is within (-45°
75°) and the phase of transient main resonant component is within (-30°
30°)
or the phase of power frequency component is within (135°
255°) and the phase of transient main resonant component is within (150°
210°)
or the ratio of the amplitudes of decaying DC component to power frequency component is greater than the preset threshold. Otherwise
the fault direction is opposite. Both the simulation and the field fault data verify the correctness of the proposed method.
关键词
Keywords
references
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