| 引用本文: | 张乃刚,张加胜,郑长明,等.基于零序电流幅值分布相似性的小电流接地故障定位方法[J].电力系统保护与控制,2018,46(13):120-125.[点击复制] |
| ZHANG Naigang,ZHANG Jiasheng,ZHENG Changming,et al.Fault section location based on similarity of zero sequence current amplitude distribution in non-solidly-earthed network[J].Power System Protection and Control,2018,46(13):120-125[点击复制] |
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| 摘要: |
| 小电流接地系统发生单相接地故障后，故障点前后的暂态零序电流波形存在明显差异，一段时间内幅值分布差别大；而故障点上、下游同侧的暂态零序电流波形相似度高，幅值分布差别小。根据各检测点暂态零序电流在故障发生后一段时间内幅值分布的相似性关系确定故障区段，定义幅值分布差异系数，以表征不同检测点之间暂态零序电流幅值分布的相似性。分别计算各区段两侧检测点的幅值分布差异系数，选择幅值分布差异系数最大值对应的区段为故障区段。该方法只用到线路上暂态零序电流信号，故障信号获取方便；只需上传检测点幅值分布序列，数据传输量小。 |
| 关键词: 小电流接地系统 零序电流 幅值分布 相似性 故障区段 |
| DOI：10.7667/PSPC170963 |
| 投稿时间：2017-06-27修订日期：2017-11-08 |
| 基金项目:中央高校基本科研业务费专项资金项目资助 (16CX06051A) |
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| Fault section location based on similarity of zero sequence current amplitude distribution in non-solidly-earthed network |
| ZHANG Naigang,ZHANG Jiasheng,ZHENG Changming,DING Li,ZHANG Guocheng |
| (College of Information and Control Engineering, China University of Petroleum, Qingdao 266580, China) |
| Abstract: |
| The waveforms of transient zero sequence current before and after the fault point is obviously different when single-phase earth fault occurs in non-solid-earthed system, difference of amplitude distribution over a period of time is big. But waveforms of transient zero sequence current on the same side of fault point’s upstream and downstream is similar, and the difference of amplitude distribution over a period of time is small. The fault section is determined by similarity relations of the amplitude distribution of transient zero sequence current over a period of time after fault, and the difference coefficient of amplitude distribution is defined to characterize the similarity of amplitude distribution of transient zero sequence current in different testing points. Firstly, it calculates the amplitude difference coefficients of both sides of the testing point in every sections, and then, the fault section is determined by the corresponding maximum amplitude difference coefficient. The signals of transient zero sequence current can only be used in this method, and the fault signal is easy to obtain. Simply uploading the detection point amplitude distribution sequence, it has small data transmission. This work is supported by Fundamental Research Funds for the Central Universities (No. 16CX06051A). |
| Key words: non-solid-earthed system zero sequence current amplitude distribution similarity fault section |
