干式空心电抗器匝间绝缘考核方法研究

Research on Inter-Turn Insulation Test Method for Dry-Type Air-Core Reactor

研究了电力系统中应用普遍的干式空心电抗器的匝间绝缘特性。首先,建立典型干式空心电抗器的仿真模型,分析计算了额定工作条件下电抗器内部匝间电场分布;其次,提出了干式电抗器线圈的波过程等效电路,仿真分析了雷电冲击试验下,干式空心电抗器匝间电场分布;针对目前常用的匝间过电压考核匝间绝缘的方法,仿真计算了干式空心电抗器的波过程和匝间电位分布。结果表明现有两种试验方法存在考核效果不全面的问题,最终认为感应耐压试验是最有意义的考核干抗匝间绝缘的试验方法。

The insulation characteristic of dry-type air-core reactor in electric power system was researched in. Firstly,the simulation model of a typical dry-type air core reactor is established,and the electric field distribution between the internal reactors under the rated operation conditions is analyzed and calculated. Then,the wave process equivalent circuit of dry-type air-core reactor was proposed,the electric field distribution was simulated and analyzed under lightening impulse test. Aiming at the co mmonly used method of inter-turnover voltage to evaluate the inter-turn insulation,the wave process and the inter-turn potential distribution of the dry-type air core reactor are simulated. The results show that the existing two test methods have the problem of incomplete evaluation. Finally,the induction withstand voltage test is considered as the most meaningful test method for evaluating dry anti-turn insulation.