矿用典型绝缘材料击穿特性及寿命模型的研究

矿用高压电气设备的绝缘部分在实际运行过程中,往往同时经受电、热、机械和环境等因子的联合作用。这些因子将引起绝缘老化,最终导致绝缘损坏。针对这一问题,首先选取矿用高压电气设备常用的3种绝缘材料电缆用乙丙橡胶、浇注式干式变压器用环氧树脂和电机槽绝缘用DMD(dacron mylar dacron)绝缘纸为研究对象,试验中测量了3种绝缘材料的击穿特性,基于Weibull分布分析并得到了描述3种绝缘材料击穿特性的形状参数和尺度参数。利用电老化反幂函数寿命模型,得到3种绝缘材料的耐电压寿命指数。最后结合聚合物分子的致密性、分子结构对3种绝缘材料的击穿机理进行了分析。研究的内容对于矿用电气设备的绝缘结构设计以及剩余寿命评估均具有实际指导意义。

Study on Breakdown Characteristic and Life Model of Typical Insulation Materials Used in Coal Mine

Due to the electrical,thermal and mechanical stresses as well as environment,the insulation of high-voltage electrical apparatus in coal mine suffers from aging,which can lead to insulation degradation and premature failure.According to the problem mentioned above,three typical insulation materials have been selected,including ethylene propylene rubber(EPR),Epoxy resin and dacron mylar dacron(DMD)insulation paper.Their breakdown characteristics also have been measured.Then,based on the Weibull distribution,shape parameter and scale parameter have been analyzed.The voltage life indexes of three insulation materials have been calculated by mean of electrical life model.Finally,combined with the density of polymer molecules and molecular structure,the breakdown mechanisms of three kinds of insulation materials are analyzed.The research on the breakdown characteristics and life model of typical insulation materials used in high-voltage electrical apparatus of coal mine is of significant meaning to design the insulation structure and estimate the residual life.