金属颗粒对绝缘油流注发展特性的影响研究

变压器在制造、运行和维修等过程中,其内部绝缘油难免会引入金属颗粒,为探究金属颗粒对油纸绝缘性能的影响,文中搭建并调试了油纸绝缘雷电冲击放电试验平台等,开展了金属颗粒对绝缘油流注发展特性影响试验研究,研究了不同浓度金属颗粒对绝缘油流注起始电压与发展过程中形态的影响,并通过COMSOL仿真平台进行验证。结果表明,金属颗粒会促进油中流注的起始与发展过程,流注停止长度和发展速度与颗粒浓度呈正相关,而绝缘油流注起始电压与击穿电压与颗粒浓度呈负相关,金属颗粒的引入会使得流注形态更加发散。分析认为油中金属颗粒与流注的相互作用是降低流注起始电压,加速流注发展,进而降低绝缘油击穿电压的主要原因。

Influence of metal particles on the development characteristics of insulating oil

In the process of manufacture, operation and maintenance of transformer, metal particles will inevitably be introduced into its internal insulation oil. In order to explore the influence of metal particles on the insulation performance of oil-paper, this paper builds a test platform for debugging lightning impulse discharge of oil-paper insulation, and carries out experimental research on the influence of metal particles on the development characteristics of oil-paper insulation. In this paper, the difference of initial voltage and development process of streamer with different concentrations of metal particles is studied and verified by COMSOL simulation platform. The results show that metal particles can promote the beginning and development of the streamer. The length and speed of stop and development of streamer are positively correlated with particle concentration, while the starting voltage and breakdown voltage of insulating oil streamer are negatively correlated with particle concentration. The analysis shows that the interaction between metal particles in oil and streamer is the main reason to reduce the starting voltage of streamer, accelerate the development of streamer, and then reduce the breakdown voltage of insulating oil.