设计了一套在0.1 MPa氦气和空气环境下测试绝缘系统电气绝缘性能的试验装置,完成了0.1 MPa气压下氦气和空气中主氦风机驱动电机绝缘系统模型的局部放电起始电压(PDIV)、起晕电压、匝间冲击、绝缘电阻和工频击穿电压对比试验。试验结果表明:在0.1 MPa气压下,绝缘系统在氦气环境下的部分绝缘性能较空气中大幅下降,氦气环境下绝缘系统的PDIV值约为空气中的50%,起晕电压值约为空气中的20%~25%, 闪络(击穿)电压约为空气中的50%。

A test apparatus that testing for the electrical insulation properties of the insulation systems under 0.1 MPa helium and air environment respectively was designed. Partial discharge inception voltage (PDIV), corona inception voltage, interturn impact, insulation resistance and power frequency breakdown voltage of insulation system model for helium circulator drive motor under 0.1 MPa helium and air environment respectively were tested. Test showed that some insulating properties of the insulation system in helium environment dropped significantly compared with that in the air environment at 0.1 MPa pressure, PDIV of insulation system in helium environment is about 50% of that in the air environment, corona inception voltage of insulation system in helium environment is about 20% to 25% of that in the air environment, flashover breakdown voltage of insulation system in helium environment is about 50% of that in the air environment.

TM305.2