变压器用酯类绝缘液浸渍纸系统模拟低温热故障下的DGA分析  

DGA analysis on ester insulating liquid impregnated paper system for transformer under simulated low temperature thermal fault

作　　者：马耀翔 王远 潘可欣 宋浩永 王炜 徐阳[1] MA Yaoxiang;WANG Yuan;PAN Kexin;SONG Haoyong;WANG Wei;XU Yang(State Key Laboratory of Electrical Insulation and Power Equipment,Xi′an Jiaotong University,Xi′an 710049,China;Guangzhou Power Supply Bureau,Guangdong Power Grid Co.,Ltd.,Guangzhou 510000,China)

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,陕西西安710049 [2]广东电网有限责任公司广州供电局,广东广州510000

出　　处：《绝缘材料》2023年第3期84-92,共9页Insulating Materials

基　　金：南方电网公司科技项目(GZHKJXM20170063)。

摘　　要：变压器用环境友好绝缘液的应用近年得到了快速发展,天然酯、合成酯和改性酯等绝缘液成为变压器新型绝缘材料研究的热点。随着其在110 kV及以上变压器中的推广应用,矿物油填充变压器的溶解气体分析(DGA)故障诊断方法对酯类绝缘液填充变压器不再适用,亟需针对酯类绝缘液提出新的故障分析与诊断的方法。本文将设计的考虑铜油温差的热故障模拟系统用于低温热故障试验,以大豆基天然酯、菜籽基天然酯、山茶籽基天然酯、合成酯和棕榈基改性酯5种绝缘液为研究对象,对比分析了其在200℃和300℃低温热故障时纯绝缘液和绝缘液浸渍纤维素纸绝缘系统下的油中溶解气体实验结果,并讨论了IEC三比值法和Duval五边形法两种判据方法的适用性。结果表明:IEC三比值法仍适用于天然酯、合成酯的200℃和300℃低温热故障判定;Duval五边形法能够用于天然酯的低温热故障判定,经修正调整可对合成酯进行判定,但是改性酯的DGA判定结果与矿物油、天然酯判据规律不一致,基于矿物油的Duval五边形法不适用于棕榈基改性酯的低温热故障判定。The environment-friendly insulating fluid for transformer has developed rapidly in recent years, insulating liquids such as natural ester, synthetic ester, and modified ester have become the research focus of new insulating material for transformer. With their applications in 110 kV and above transformers, the dissolved gas analysis(DGA) fault diagnosis method of mineral oil filled transformer is no longer suitable for the ester insulating liquid filled transformer. In this paper, a thermal fault simulation system with temperature difference between copper and liquid was designed to simulate the low temperature thermal fault. The soybean, rapeseed, camellia based natural ester, synthetic ester, and palm based modified ester insulating liquids were used as research object, the experimental results of dissolved gas in pure liquid and liquid-paper insulating system under 200℃ and 300℃ low temperature thermal fault were analyzed, and the applicability of the IEC ratio method and Duval pentagon method were discussed. The results show that the IEC ratio method is still applicable to 200℃and 300℃ low temperature thermal fault diagnosis of natural esters and synthetic ester. The Duval pentagon method can be used to recognize the low temperature thermal fault of natural esters and synthetic ester after adjustment. However, the DGA results of modified ester are inconsistent to those of mineral oil and natural esters, and the Duval pentagon method based on mineral oil is not suitable for the low temperature thermal fault diagnosis of palm based modified ester.

关 键 词：变压器 酯类绝缘液 低温热故障 溶解气体分析 故障判定 

分 类 号：TM214[一般工业技术—材料科学与工程]