作者机构：
[刘志峰; 朱志平; 石纯; 黄赵鑫] Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha, 410114, China
作者机构：
[Longbiao T.; Zhiping Z.; Qiang Y.; Lei Y.] School of Chemical and Biological Engineering, Changsha University of Science and Technology, Changsha, 410014, China;[Chunlei Z.] Datang Central-China Electric Power Test Research Institute, Zhengzhou, 450001, China
通讯机构：
School of Chemical and Biological Engineering, Changsha University of Science and Technology, Changsha, China
摘要：
Recently, a kind of 110-kV transformer resistance decline defect was found during our routine preventive test of transformers in the Guangdong power grid. The number of defective transformers reached thirty. This phenomenon seriously threatened the safe and steady operation of the power grid. The analysis and treatment of this resistance decline defect were carried out. The key reason for this defect was confirmed. The insulating characteristics of insulating oil decreased. Aminopyrine is a kind of medicine used as an antipyretic analgesic. However, it was seldom investigated by the electric power industry. Aminopyrine as a potential contaminant was found to be present in insulating oils of transformers causing insulation resistance decline defect. Herein, the analysis process of defective insulating oils was introduced. The determination and quantitative detection of aminopyrine were performed using a gas chromatography-mass spectrometer, in which the highest concentration of aminopyrine in insulating oil was determined to be nearly 100 mg/kg. The source of aminopyrine was surveyed. Moreover, the impact mechanism between aminopyrine and insulating property of transformer oil was discussed. Finally, we found adsorption was effective for this defect. To date, this method has been applied to solve this defect in the Guangdong power grid. (c) 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
关键词：
degree of polymerization(DP);metal material;microstructure;oil-paper insulation;thermal aging
摘要：
This study investigated the influence of the main metal materials of transformers on the oil-paper insulation performance. Ten types of insulating specimens were subjected to accelerated thermal aging at 120°C. Some aging parameters, including oil acid number, furfural content and degree of polymerization (DP) of insulating paper, were measured and compared. At the same time, we conducted frequency domain spectroscopy, X-ray diffraction, scanning electron microscopy and energy dispersive spectrometry on the insulating paper. The following conclusions were drawn: silicon lamination slightly deteriorates the insulating oil, copper increases the acidity and accelerates the production of furfural, metal materials can decrease DP of insulating paper and the effect of copper is greater than that of silicon lamination. During thermal aging, the dielectric dissipation factor of insulating paper increases and the carbon content of insulating paper increases. Metal materials can significantly increase the dielectric dissipation factor and carbon content of insulating paper and the effect of copper is greater than that of silicon lamination.
摘要：
When tested as the cathode material for potassium-ion batteries, K2V3O8 delivers a highly reversible capacity of over 100 mA h g-1 in the voltage range of 1.5-4.5 V with 73% capacity retained after 50 cycles. Charge-discharge is achieved by a nontopotactic process between K2V3O8 and KV3O8 (DeltaV approximately -23.4%), causing the slow capacity decay.
作者机构：
[王灯; 朱志平] Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemical and Biological Engineering, Changsha University of Science & Technology, Changsha;410114, China;[张丽; 苏伟; 陈天生; 范圣平] Electric Power Research Institute of Guangdong Power Grid Co., Ltd., Guangzhou;510080, China;[王灯; 朱志平] 410114, China
通讯机构：
[Zhu, Z.] H;Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, China
作者机构：
[曹颉; 朱志平; 王灯; 张俞] School of Chemistry and Biological Engineering, Changsha University of Science & Technology, Changsha;410114, China;[曹颉; 朱志平; 王灯; 张俞] 410114, China
通讯机构：
School of Chemistry and Biological Engineering, Changsha University of Science & Technology, Changsha, China
作者机构：
[乔越; 朱志平; 杨磊; 刘志峰] Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha, 410004, China
通讯机构：
Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha, China
通讯机构：
Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha, China
