Development Rules of Accelerated Degradation of Oil-Paper Insulation between Turns in Transformer Windings Induced by Partial Discharge
Cheng Yangchun1, Wei Jinqing1, Li Chengrong2, Rong Zhihai1, Wang Guangzhen1, Ma Zhenli1
1. Beijing Key Laboratory of High Voltage and Electromagnetic Compatibility North China Electric Power University Beijing 102206 China; 2. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China
Abstract：Tests based on the inter-turn partial discharge model are conducted to study the development rules of oil-paper insulation material defects generated by partial discharge in power transformers and its possible correlation with the characteristics of partial discharge. The constant voltage is adopted in this series of tests. High voltage is applied on the inter-turn electrode specimens with different time length in different groups of tests. Real-time detection is conducted to record conventional impulse current signals from partial discharge. After tests, insulation tapes were stripped from inter-turn electrodes lay by layer. In this way, the statistical laws about the development rules of the carbon channels generated by accelerated degradation between turns are acquired. The results show that the development of the carbon channels generated by accelerated degradation under a high constant voltage can be divided into three basic stages: growth, stagnation, and breakdown. The pulse repetition rate and the summation of pulse amplitude per second can reflect the insulate degradation development state of the inter-turn oil paper system. Based on these results, the severity of partial discharge in the oil-paper insulation can be assessed accurately.
程养春, 魏金清, 李成榕, 荣智海, 王广真, 马振丽. 局部放电作用下变压器匝间油纸绝缘加速劣化规律[J]. 电工技术学报, 2015, 30(18): 203-212.
Cheng Yangchun, Wei Jinqing, Li Chengrong, Rong Zhihai, Wang Guangzhen, Ma Zhenli. Development Rules of Accelerated Degradation of Oil-Paper Insulation between Turns in Transformer Windings Induced by Partial Discharge. Transactions of China Electrotechnical Society, 2015, 30(18): 203-212.
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2015, Vol. 30 
