A New Method for Stator Ground Fault Protection with Voltage Injection on Large Hydro Generators Grounded by Arc Suppression Coils
For stator ground fault protection of large hydro-generators grounded with arc suppression coil at neutral point, the conventional method is to inject 20 Hz signal from the instrument coil attached to the arc suppression coil. In order to improve the effect of the protection and to overcome the diff...
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| Format: | Article |
| Language: | zho |
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State Grid Energy Research Institute
2021-12-01
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| Series: | Zhongguo dianli |
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| Online Access: | https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202010102 |
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| author | Lang ZHOU Jianzheng LIU Qixue ZHANG Bo ZHONG Lin GUI |
| author_facet | Lang ZHOU Jianzheng LIU Qixue ZHANG Bo ZHONG Lin GUI |
| author_sort | Lang ZHOU |
| collection | DOAJ |
| description | For stator ground fault protection of large hydro-generators grounded with arc suppression coil at neutral point, the conventional method is to inject 20 Hz signal from the instrument coil attached to the arc suppression coil. In order to improve the effect of the protection and to overcome the difficulties caused by the increase of stator-to-ground capacitance, a new method is proposed to inject the 20 Hz signal from the resistor in series with the arc suppression coil. The proposed method is compared with the conventional one in terms of the 20 Hz equivalent circuit viewed from the injection port, and the corresponding calculation method for transition resistance is also studied. Taking a generator of Tianshengqiao-Ⅱ Hydro Power Station as the research object, an arc suppression coil based on the parameters of the real generators’ arc suppression coil is customized for test, and the stator ground fault experiment is conducted on a dynamic simulation generator to test the effectiveness of the two methods. The results of the experiment show that, compared with the conventional method, the proposed new method has the maximum measured ground fault transition resistance increasing from 5.6 kΩ to 20 kΩ with an error within ±6%. |
| format | Article |
| id | doaj-art-2a817024ca7f43b7943ba20ecb93490e |
| institution | OA Journals |
| issn | 1004-9649 |
| language | zho |
| publishDate | 2021-12-01 |
| publisher | State Grid Energy Research Institute |
| record_format | Article |
| series | Zhongguo dianli |
| spelling | doaj-art-2a817024ca7f43b7943ba20ecb93490e2025-08-20T02:06:21ZzhoState Grid Energy Research InstituteZhongguo dianli1004-96492021-12-01541211212010.11930/j.issn.1004-9649.202010102zgdl-54-07-zhoulangA New Method for Stator Ground Fault Protection with Voltage Injection on Large Hydro Generators Grounded by Arc Suppression CoilsLang ZHOU0Jianzheng LIU1Qixue ZHANG2Bo ZHONG3Lin GUI4State Key Laboratory of Control and Simulation of Power System and Generation Equipments(Department of Electrical Engineering, Tsinghua University), Beijing 100084, ChinaState Key Laboratory of Control and Simulation of Power System and Generation Equipments(Department of Electrical Engineering, Tsinghua University), Beijing 100084, ChinaNR Electric Co., Ltd., Nanjing 211102, ChinaTianshengqiao Hydropower Plant, Tianshengqiao II Hydropower Co., Ltd., Xingyi 562400, ChinaState Key Laboratory of Control and Simulation of Power System and Generation Equipments(Department of Electrical Engineering, Tsinghua University), Beijing 100084, ChinaFor stator ground fault protection of large hydro-generators grounded with arc suppression coil at neutral point, the conventional method is to inject 20 Hz signal from the instrument coil attached to the arc suppression coil. In order to improve the effect of the protection and to overcome the difficulties caused by the increase of stator-to-ground capacitance, a new method is proposed to inject the 20 Hz signal from the resistor in series with the arc suppression coil. The proposed method is compared with the conventional one in terms of the 20 Hz equivalent circuit viewed from the injection port, and the corresponding calculation method for transition resistance is also studied. Taking a generator of Tianshengqiao-Ⅱ Hydro Power Station as the research object, an arc suppression coil based on the parameters of the real generators’ arc suppression coil is customized for test, and the stator ground fault experiment is conducted on a dynamic simulation generator to test the effectiveness of the two methods. The results of the experiment show that, compared with the conventional method, the proposed new method has the maximum measured ground fault transition resistance increasing from 5.6 kΩ to 20 kΩ with an error within ±6%.https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202010102large generatorstator ground fault protectionvoltage injectionarc suppression coiltransition resistance |
| spellingShingle | Lang ZHOU Jianzheng LIU Qixue ZHANG Bo ZHONG Lin GUI A New Method for Stator Ground Fault Protection with Voltage Injection on Large Hydro Generators Grounded by Arc Suppression Coils Zhongguo dianli large generator stator ground fault protection voltage injection arc suppression coil transition resistance |
| title | A New Method for Stator Ground Fault Protection with Voltage Injection on Large Hydro Generators Grounded by Arc Suppression Coils |
| title_full | A New Method for Stator Ground Fault Protection with Voltage Injection on Large Hydro Generators Grounded by Arc Suppression Coils |
| title_fullStr | A New Method for Stator Ground Fault Protection with Voltage Injection on Large Hydro Generators Grounded by Arc Suppression Coils |
| title_full_unstemmed | A New Method for Stator Ground Fault Protection with Voltage Injection on Large Hydro Generators Grounded by Arc Suppression Coils |
| title_short | A New Method for Stator Ground Fault Protection with Voltage Injection on Large Hydro Generators Grounded by Arc Suppression Coils |
| title_sort | new method for stator ground fault protection with voltage injection on large hydro generators grounded by arc suppression coils |
| topic | large generator stator ground fault protection voltage injection arc suppression coil transition resistance |
| url | https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202010102 |
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