漆包线绝缘层局部放电及电击穿过程机理与潜在风险分析

Mechanism and potential risk analysis of partial discharge and electrical breakdown on enamelled wire insulation layer

为了准确识别漆包线品质下降的潜在风险,本文研究了表面导电状态对漆包线电绝缘性能的影响,并观察总结了漆包线的电击穿规律。结果表明:表面导电能力提升会使漆包线的局部放电起始电压显著下降,漆包线电击穿大部分情况并不在漆包线的贴合位置,而是随机出现在相邻的两处漆包线电绝缘薄弱点。在漆包线生产、运输、装配过程中要避免表面接触盐类物质,控制装配过程的环境湿度,避免绝缘材料表面电荷传递影响电机整体绝缘性能。

In order to identify the potential risk of enamelled wire quality degradation,the influence of surface conductivity on the electrical insulation performance of enamelled wire was studied,and the electrical breakdown law of enamelled wire was also observed and analyzed.The results show that with the increase of surface conductivity of enamelled wire,the partial discharge(PD)inception voltage decreases significantly.Most of the electrical breakdown does not occur at the bonding position of enamelled wire,but randomly occurs at the weak points of electrical insulation at two adjacent enamelled wire.In the process of production,transportation,and assembly of enameled wire,it is necessary to avoid surface contact with salt substances,and control the environmental humidity during the assembly process,and avoid the surface charge transfer of insulating materials affecting the overall insulation performance of the motor.