Three‐phase isolated power transformer based novel structure for power distribution system and new theoretical/practical judgement criteria in detecting high‐impedance earth faults
Abstract Single phase‐earth faults are the most frequent faults likely to occur but hard to identify in distribution system, especially in a neutral un‐effectively grounded system. To address this issue, this paper innovatively proposes a typical distribution system structure, in which it only intro...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2023-09-01
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| Series: | IET Renewable Power Generation |
| Subjects: | |
| Online Access: | https://doi.org/10.1049/rpg2.12812 |
| _version_ | 1797693132691734528 |
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| author | Hua Zhang Xueneng Su Longjiang Li Xin Ning Rui Zhang Cheng Long Shilong Li Yiwen Gao |
| author_facet | Hua Zhang Xueneng Su Longjiang Li Xin Ning Rui Zhang Cheng Long Shilong Li Yiwen Gao |
| author_sort | Hua Zhang |
| collection | DOAJ |
| description | Abstract Single phase‐earth faults are the most frequent faults likely to occur but hard to identify in distribution system, especially in a neutral un‐effectively grounded system. To address this issue, this paper innovatively proposes a typical distribution system structure, in which it only introduces one three‐phase isolated power transformer (PT)‐based subnetwork division mode that can effectively limit the zero‐sequence current flow from other sound lines. Second, following the qualitative discussions about the effect of the proposed structures on power supply reliability and probability of bushfires caused by high impedance earth faults (HIEFs), a novel detecting judgement criterion merely using vector‐based variation via pre‐fault and post‐fault zero‐sequence voltage is mathematically formulated. In general, the proposed structure takes into account the the fault current suppression while manifesting fault feature at the same time, and in contrast with current detecting methods, vectorized form can present a wider exploring space and a higher identifying sensitivity, especially in detecting HIEFs. Numerical simulations and field tests validate the effectiveness and adaptability of the proposed detecting approach towards single phase‐earth fault identification field. |
| first_indexed | 2024-03-12T02:38:09Z |
| format | Article |
| id | doaj.art-3e8b50c922674eee9aefdddb566aea0e |
| institution | Directory Open Access Journal |
| issn | 1752-1416 1752-1424 |
| language | English |
| last_indexed | 2024-03-12T02:38:09Z |
| publishDate | 2023-09-01 |
| publisher | Wiley |
| record_format | Article |
| series | IET Renewable Power Generation |
| spelling | doaj.art-3e8b50c922674eee9aefdddb566aea0e2023-09-04T09:41:28ZengWileyIET Renewable Power Generation1752-14161752-14242023-09-0117122997301010.1049/rpg2.12812Three‐phase isolated power transformer based novel structure for power distribution system and new theoretical/practical judgement criteria in detecting high‐impedance earth faultsHua Zhang0Xueneng Su1Longjiang Li2Xin Ning3Rui Zhang4Cheng Long5Shilong Li6Yiwen Gao7State Grid Sichuan Electric Power Research Institute ChengduChinaState Grid Sichuan Electric Power Research Institute ChengduChinaState Grid Sichuan Power Supply Company ChengduChinaState Grid Sichuan Electric Power Research Institute ChengduChinaState Grid Sichuan Electric Power Research Institute ChengduChinaState Grid Sichuan Electric Power Research Institute ChengduChinaState Grid Sichuan Electric Power Research Institute ChengduChinaState Grid Sichuan Electric Power Research Institute ChengduChinaAbstract Single phase‐earth faults are the most frequent faults likely to occur but hard to identify in distribution system, especially in a neutral un‐effectively grounded system. To address this issue, this paper innovatively proposes a typical distribution system structure, in which it only introduces one three‐phase isolated power transformer (PT)‐based subnetwork division mode that can effectively limit the zero‐sequence current flow from other sound lines. Second, following the qualitative discussions about the effect of the proposed structures on power supply reliability and probability of bushfires caused by high impedance earth faults (HIEFs), a novel detecting judgement criterion merely using vector‐based variation via pre‐fault and post‐fault zero‐sequence voltage is mathematically formulated. In general, the proposed structure takes into account the the fault current suppression while manifesting fault feature at the same time, and in contrast with current detecting methods, vectorized form can present a wider exploring space and a higher identifying sensitivity, especially in detecting HIEFs. Numerical simulations and field tests validate the effectiveness and adaptability of the proposed detecting approach towards single phase‐earth fault identification field.https://doi.org/10.1049/rpg2.12812distribution systemhigh impedancepower supply reliabilityzero‐sequence currentzero‐sequence voltage |
| spellingShingle | Hua Zhang Xueneng Su Longjiang Li Xin Ning Rui Zhang Cheng Long Shilong Li Yiwen Gao Three‐phase isolated power transformer based novel structure for power distribution system and new theoretical/practical judgement criteria in detecting high‐impedance earth faults IET Renewable Power Generation distribution system high impedance power supply reliability zero‐sequence current zero‐sequence voltage |
| title | Three‐phase isolated power transformer based novel structure for power distribution system and new theoretical/practical judgement criteria in detecting high‐impedance earth faults |
| title_full | Three‐phase isolated power transformer based novel structure for power distribution system and new theoretical/practical judgement criteria in detecting high‐impedance earth faults |
| title_fullStr | Three‐phase isolated power transformer based novel structure for power distribution system and new theoretical/practical judgement criteria in detecting high‐impedance earth faults |
| title_full_unstemmed | Three‐phase isolated power transformer based novel structure for power distribution system and new theoretical/practical judgement criteria in detecting high‐impedance earth faults |
| title_short | Three‐phase isolated power transformer based novel structure for power distribution system and new theoretical/practical judgement criteria in detecting high‐impedance earth faults |
| title_sort | three phase isolated power transformer based novel structure for power distribution system and new theoretical practical judgement criteria in detecting high impedance earth faults |
| topic | distribution system high impedance power supply reliability zero‐sequence current zero‐sequence voltage |
| url | https://doi.org/10.1049/rpg2.12812 |
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