基于油色谱分析的变压器复合绝缘缺陷多指标综合权重评估方法  

Multi-index and Comprehensive Weighted Assessment Method for Transformer Compound Insulation Defects Based on Dissolved Gases Analysis

作　　者：王学磊 李庆民[2] 杨芮[2] 高树国[3] 

机构地区：[1]国网山东省电力公司电力科学研究院,济南250061 [2]华北电力大学高电压与电磁兼容北京市重点实验室,北京102206 [3]国网河北省电力公司电力科学研究院,石家庄050021

出　　处：《高电压技术》2015年第11期3836-3842,共7页High Voltage Engineering

基　　金：国家自然科学基金(51477051);北京市自然科学基金(3142018)~~

摘　　要：电力变压器的绝缘缺陷经常是多种缺陷类型的复合,且存在不确定性和模糊性,而现有诊断方法一般无法有效地诊断或评估复合绝缘缺陷。因此引入模糊理论,结合实际绝缘缺陷案例,研究了评估变压器复合绝缘缺陷严重程度的方法。首先基于油色谱综合诊断方法,采用模糊向量改善判据编码边界的绝对化问题,引入模糊逻辑实现复合绝缘缺陷的模糊综合诊断,从而提出了表征绝缘缺陷发生可能性大小的发生概率权重;然后,根据复合绝缘缺陷的模糊综合诊断方法统计分析实际变压器缺陷案例,提出了表征各缺陷类型诊断准确率差异的可靠性权重;最后,综合发生概率权重、可靠性权重等信息,建立了多指标综合权重评估变压器复合绝缘缺陷严重程度的新方法。实例分析表明,与传统诊断方法相比,基于多指标综合权重的评估方法正确率高达91.7%,具有更高的准确度与可靠性,可取得较好的应用效果。Accompanied by uncertainty and fuzziness, it is hard to diagnose and evaluate compound insulation defects by using present diagnostic approaches. Hence, we introduced the fuzzy theory to develop a method for evaluating com- pound insulation defects based on a case study of practical insulation defect. Firstly, on the basis of the comprehensive diagnosis methods of oil chromatogram, we used fuzzy vectors to relieve the absolutes of criterion boundaries, adopted fuzzy logics to achieve the fuzzy comprehensive diagnosis of compound insulation defects, and proposed to use occur- rence probability weight to represent the possibility of insulation defect happening. Secondly, after analyzing a practical case of transformer defect using the fuzzy comprehensive diagnostic method, we adopted reliability weight to characterize the diagnostic accuracy for different defect types. Finally, taking both the occurrence probability weight and the reliability weight into consideration, we obtained a multi-index method with comprehensive weights for assessing the severity of compound insulation defects in transformers. According the assessment results of several transformer faults, accuracy of the proposed method reaches 91.7%. It is more accurate and more reliable in comparison with conventional dissolved gases analysis （DGA） methods.

关 键 词：变压器 油中溶解气体分析 复合缺陷 发生概率权重 可靠性权重 模糊逻辑 

分 类 号：TM41[电气工程—电器]