引用本文: | 徐玉琴,杨浩,李鹏.不同接地方式电缆型配电网单相接地故障下的可靠性评估[J].电力系统保护与控制,2018,46(13):41-47.[点击复制] |
XU Yuqin,YANG Hao,LI Peng.Reliability evaluation of different grounding cable networks on single-phase grounding fault[J].Power System Protection and Control,2018,46(13):41-47[点击复制] |
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摘要: |
为了对不同接地方式下电缆型配电网的可靠性进行评估,对消弧线圈接地方式和小电阻接地方式下线路发生单相接地故障时线路的跳闸率模型进行了分析,结合两种接地方式的特点分析了故障隔离和负荷转移对负荷点可靠性的影响。利用基于故障模式影响分析的最小路法分别建立了两种接地方式下负荷点的长时和短时可靠性指标计算模型。最后,对广东某市电缆型配电网的供电可靠性进行了评估。结果表明:消弧线圈接地方式比小电阻接地方式有更高的可靠性,但随着各馈线之间的联络越来越紧密消弧线圈接地方式的优势越不明显。所得结论能够为电缆型配电网中性点接地方式的选择提供理论参考。 |
关键词: 中性点接地方式 电缆型配电网 单相接地故障 可靠性评估 最小路法 |
DOI:10.7667/PSPC171024 |
投稿时间:2017-07-10修订日期:2017-09-24 |
基金项目:国家自然科学基金项目资助(51577068) |
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Reliability evaluation of different grounding cable networks on single-phase grounding fault |
XU Yuqin,YANG Hao,LI Peng |
(School of Electrical and Electronic Engineering, North China Electric Power University, Baoding 071003, China) |
Abstract: |
In order to evaluate the reliability of different grounding cable network, the tripping-rate models when single-phase fault occurs in the line under Petersen coil and low resistance grounding mode are discussed, and the influence on load point’s reliability from fault isolation and load transfer is analyzed by combining the characteristics of two grounding modes. By taking advantage of the minimal path method based on the failure mode and effect analysis, different reliability indexes in long-term and short-term are built based on grounding modes. Finally, the cable network reliability of a city in Guangdong is evaluated. The results show that the reliability of Petersen coil grounding mode is higher than that of low resistance grounding mode. But the advantages of Petersen coil grounding mode are less obvious along with the closer connection of the feeders. The conclusions could provide reference for choosing neutral point grounding modes in cable distribution network. This work is supported by National Natural Science Foundation of China (No. 51577068). |
Key words: neutral point grounding mode cable distribution network single-phase grounding fault reliability evaluation minimal path method |