Improvement of single-phase grounding fault detection for small resistance grounding systems based on steady-state monitoring information in the substation
| Autor: | LIU Jian, ZHU Qingsong, WANG Yizhao, ZHANG Zhihua, CHEN Jieyu |
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| Jazyk: | čínština |
| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Zhejiang dianli, Vol 42, Iss 4, Pp 1-8 (2023) |
| Druh dokumentu: | article |
| ISSN: | 1007-1881 20230400 |
| DOI: | 10.19585/j.zjdl.202304001 |
| Popis: | In order to use the existing hardware sources to improve the line selection performance of single-phase grounding fault of small resistance grounding systems， a method for line selection of single-phase grounding fault based on the global steady-state monitoring information of the substation automation system is investigated. The zero-sequence voltage of the busbar and the zero-sequence current of each line in the case of single-phase grounding faults are deduced. The ratio of zero-sequence current of lines with single-phase grounding faults to that of non-fault lines under extreme conditions is analyzed. Moreover， the line selection method of single-phase grounding fault is proposed. The zero-sequence current is used as the starting criterion for line selection of single-phase grounding fault， and the setting principle of zero-sequence principle is introduced to calculate the maximum transition resistance that can be started under the setting value of zero-sequence current. An example is given to illustrate the proposed method， and the results show that the steady-state monitoring information of the substation automation system can remarkably improved the detection performance of single-phase grounding fault of small resistance grounding systems. |
| Databáze: | Directory of Open Access Journals |
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