The Rapid-Development-Type Discharge Failure and Its Damage Characteristics to Oil-Paper Insulation
Wei Yiheng1, Yang Lijun1, Xu Zhiren1, Yang Xu2, Liu Yi2
1. State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing 400044 China; 2. State Grid Electric Power Research Institute Wuhan Nari Co. Ltd Wuhan 430074 China
Abstract：The insulation field strength of UHV transformers is close to the design limit, and the process of breakdown caused by partial discharge under high field strength has the characteristic of rapid development. There were many cases of “rapid development type” discharge failure frequently occurred in the delivery and handover tests of UHV transformers, only a few minutes from partial discharge generation to main insulation breakdown or near breakdown, which caused great hidden dangers to the operation of UHV transformers. In order to explore the forming reason of the “rapid development type” discharge failure and its damage characteristics to oil-paper insulation, this paper studied the U-t characteristic curve and electric life model of oil-paper insulation under extremely non-uniform electric field, and proposed to use U-t characteristic curve to distinguish between “ordinary type” and “rapid development type” discharge failures. The results indicate that under extremely non-uniform electric field, the electrical life U-t characteristic of oil-paper insulation follows IPM (inverse power model). The voltage tolerance index n in IPM of different electric field regions can be used as the basis for distinguishing the two types of discharge. From the damage marks of oil-paper insulation, the “rapid development type” discharge has similarities and respective characteristics with the “ordinary type” discharge. Both discharges produce corona discharge and gliding spark discharge, accompanied by white spots and gas generation. The difference is that the “rapid development type” discharge develops fast and the damage to pressboard is serious, which will produce bright discharge channel and dendritic carbon marks on the surface of pressboard, while the “ordinary type” discharge develops relatively slowly and has less damage to the pressboard, only dotted carbon marks are produced at the tip of the needle. Dendritic carbon marks are the main feature of the “rapid development type” discharge failure, which can be divided into two stages of rapid growth and slow growth, and conforms to the growth law of electrical tree in insulation materials. This paper can provide a reference for distinguishing between the “rapid development type” and the “ordinary type” discharge failures, and lay a foundation for mastering the “rapid development type” discharge failure rules and effective early warning and diagnosis.
魏意恒, 杨丽君, 徐治仁, 杨旭, 刘诣. “快速发展型”放电故障及其对油纸绝缘的损伤特性[J]. 电工技术学报, 2022, 37(4): 1020-1030.
Wei Yiheng, Yang Lijun, Xu Zhiren, Yang Xu, Liu Yi. The Rapid-Development-Type Discharge Failure and Its Damage Characteristics to Oil-Paper Insulation. Transactions of China Electrotechnical Society, 2022, 37(4): 1020-1030.
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