Improvement on Condition Assessment Model for Oil-paper Insulation  

作　　者：LA Yuan SHI Xuetao CAO Wen HE Baosheng KE Chunjun WU Kai LONG Hongyu 

机构地区：[1]Electric Power Research Institute of Guangdong Power Grid Corporation, Guangzhou 510080, China [2]State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China [3]Electronic Information College, Xi'an Polytechnic University, Xi'an 710048, China [4]Postdoctoral Workstation of Chongqing Electric Power Corporation, Chongqing 401123, China

出　　处：《高电压技术》2013年第8期1974-1980,共7页High Voltage Engineering

基　　金：Project supported by National Basic Research Program of China (973 Program) (2011CB 209404)

摘　　要：Identification of the aging condition and the failure probability of oil-paper insulation in transformer is important for improving the reliability of electric power transmission system and applying life cycle cost (LCC) management to electrical equipment. Based on data obtained in a series of multi-accelerated-aging experiments, two approaches for calculating failure probability of oil-paper insulation were compared in aspects of degree of polymerization (DP) and condition ranking. In the experiments, mineral oil and cellulose paper are sub- jected to electrical and thermal stresses, and several parameters, including dissolved gases’ volume fraction, furfural content, moisture content, and degree of polymerization, are measured after the aging process. Results show that weight of carbon oxide, which has a close relationship with cellulose paper degradation, is much higher in DP model than in condition ranking model. Moreover, it is concluded that DP model is more practically accurate than condition ranking model, because aging of cellulose paper rather than mineral oil is the key and critical factor of oil-paper insulation aging.Identification of the aging condition and the failure probability of oil-paper insulation in transformer is important for improving the reliability of electric power transmission system and applying life cycle cost （LCC） management to electrical equipment. Based on data obtained in a series of multi-accelerated-aging experiments, two approaches for calculating failure probability of oil-paper insulation were compared in aspects of degree of polymerization （DP） and condition ranking. In the experiments, mineral oil and cellulose paper are sub- jected to electrical and thermal stresses, and several parameters, including dissolved gases＇ volume fi＇action, furfural content, moisture content, and degree of polymerization, are measured after the aging process. Results show that weight of carbon oxide, which has a close relationship with cellulose paper degradation, is much higher in DP model than in condition ranking model. Moreover, it is concluded that DP model is more practically accurate than condition ranking model, because aging of cellulose paper rather than mineral oil is the key and critical factor of oil-paper insulation aging.

关 键 词：油纸绝缘 评估模型 绝缘状态 老化实验 寿命周期成本 电力传输系统 失效概率 纤维素 

分 类 号：TM406[电气工程—电器] TM31