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Partial Discharge Characteristics of Typical Defects in Generator Stator After Thermal Ageing
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Xin WANG1, Min YANG1, Yang JIN1, Xiaozhong TONG1, Hao DU2, Xiangrong CHEN2
Insulating Materials | 2021, 54(4) : 58 - 63
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Insulating Materials | 2021, 54(4): 58-63
• Insulation Technology •
Partial Discharge Characteristics of Typical Defects in Generator Stator After Thermal Ageing
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Xin WANG1, Min YANG1, Yang JIN1, Xiaozhong TONG1, Hao DU2, Xiangrong CHEN2
Affiliations
  • 1Zhejiang Key Laboratory of High-efficient Energy-saving and Pollutant Control Technology for Thermal Power Generation, Zhejiang Energy Group Research Institute Co., Ltd., Hangzhou 311121, China
  • 2Zhejiang Provincial Key Laboratory of Electrical Machine Systems, College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Published: 2021-04-20 doi: 10.16790/j.cnki.1009-9239.im.2021.04.010
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Three typical stator defect models were fabricated using the generator stators in actual operation, and then conducted accelerated thermal ageing tests. The difference on partial discharge characteristics of the three typical defects before and after ageing was studied using pulse current method. The results show that after ageing, the partial discharge inception voltage (PDIV) of the model with internal defect increases, while the PDIV of the model with slot discharge and end discharge decrease, this is because there are large number of cracks on the epoxy mica tape insulation surface due to thermal ageing. The phase resolved partial discharge (PRPD) pattern of internal discharge model is symmetrical, and the width of discharge phase becomes narrow after thermal ageing; the PRPD pattern of slot discharge model changes from hill shape to semi ellipse shape after thermal ageing, and the discharge density increases significantly; the PRPD pattern of end discharge model shows the characteristics of corona discharge, and the discharge characteristics at the positive and negative half-cycle of alternating current is obvious asymmetry.

generator stator  /  thermal ageing  /  partial discharge  /  discharge pattern
Xin WANG, Min YANG, Yang JIN, Xiaozhong TONG, Hao DU, Xiangrong CHEN. Partial Discharge Characteristics of Typical Defects in Generator Stator After Thermal Ageing[J]. Insulating Materials, 2021 , 54 (4) : 58 -63 . DOI: 10.16790/j.cnki.1009-9239.im.2021.04.010
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Article Info
doi: 10.16790/j.cnki.1009-9239.im.2021.04.010
  • Receive Date：2020-11-24
  • Online Date：2026-01-26
  • Published：2021-04-20
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History
  • Received：2020-11-24
  • Revised：2021-01-13
Funding
Affiliations
    1Zhejiang Key Laboratory of High-efficient Energy-saving and Pollutant Control Technology for Thermal Power Generation, Zhejiang Energy Group Research Institute Co., Ltd., Hangzhou 311121, China
    2Zhejiang Provincial Key Laboratory of Electrical Machine Systems, College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
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https://castjournals.cast.org.cn/joweb/jycl/EN/10.16790/j.cnki.1009-9239.im.2021.04.010
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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