The electrical strength of vacuum insulation system is usually limited by the flashover phenomenon across the surface of insulator in vacuum. Multilayer high gradient insulator technology, a new insulator structure, is reported to perform higher breakdown electric field strength than conventional insulators. 真空中沿面闪络现象是制约真空设备耐压强度的一个重要因素,采用多层高梯度绝缘技术,比传统绝缘结构能显著提高击穿场强。
The insulation characteristic of insulator in vacuum is researched in the process of the high voltage breakdown along the insulator surface in vacuum, which is called vacuum surface flashover. 绝缘子的真空表面绝缘特性研究真空下的高压沿绝缘子表面击穿物理过程,称真空表面闪络过程。
The present paper through to equipment the and so on generator, transformer, circuit breaker, isolator, line insulator insulation breakdown appraised that, has analyzed each kind of equipment implementation condition examination technical plan, and briefed my factory practical application situation. 本论文通过对发电机、变压器、断路器、隔离开关、线路绝缘子等设备的绝缘故障评估,分析了各种设备实施状态检测的技术方案,并介绍了我厂的实际应用情况。
At an electric field near a high-voltage conductor with a solid insulator, whose average value of intensity is less than the dielectric breakdown strength of the air, micro-discharge can start from contact points owing to triple junction effect. 绝缘支持的高电压导体近旁电场,即使其平均场强低于空气绝缘破坏场强,也会因三重点效应,在接触点发生微小放电。
The partial discharge ( PD) is produced because there is uneven electric field in the part of insulator, and when there is high partial electric field, which will lead to dielectric breakdown within the local area of the insulator or the electrical discharge phenomena. 局部放电的产生就是由于绝缘体内部存在分布不均匀的电场,而当有过高的局部电场作用时,就会导致绝缘介质内部局部区域内的击穿或者电气放电现象。