ong-termoverheataging deterioration;in addition,also havegood thermal conductivity,hightidelightningresistance and high mechanical strengthand

Insulating materialrole is in theelectrical equipmentin theelectric potentialdifferentlive partsisolated.Theinsulating material is firstshould have highinsulationresistanceand compressive strength,and can avoid theoccurrence ofleakage current,breakdownaccident.The secondheat resistantperformance is better,avoid

绝缘材料的作用是在电气设备中把电势不同的带电部分隔离开来。因此绝缘材料首先应具有较高的绝缘电阻和耐压强度,并能避免发生漏电、击穿等事故。其次耐热性能要好,避免因长期过热而老化变质;此外,还应有良好的导热性、耐潮防雷性和较高的机械强度以及工艺加工方便等特点。根据上述要求,常用绝缘材料的性能指标有绝缘强度、抗张强度、比重、膨胀系数等。