液氮温度下菱格点胶薄膜绝缘特性  

Insulation characteristics of DPF at liquid nitrogen temperature

作　　者：张肖杰[1,2] 王银顺[1,2] 代常会[1,2] 李肖[1,2] 程远[1,2] 郑志强[1,2] 

机构地区：[1]华北电力大学新能源电力系统国家重点实验室,北京102206 [2]华北电力大学高电压技术与电磁兼容北京市重点实验室,北京102206

出　　处：《低温工程》2012年第5期15-18,27,共5页Cryogenics

基　　金：国家自然科学基金(51077051)项目资助

摘　　要：选用商用绝缘材料DPF(菱格点胶薄膜)进行液氮温度(77 K)下的工频击穿,雷电击穿和迭层效应试验研究,并与常温(25 K)下进行对比。单面菱格点胶薄膜是由PET薄膜一面加菱形环氧树脂涂层构成。实验表明,液氮温度下单层菱格点胶薄膜击穿场强为135.6 kV/mm,由于迭层效应的影响,随着绝缘厚度的增加,击穿场强逐渐减小并达到饱和。由实验可知在高电压等级下的绝缘厚度很小,可以有效减小绝缘占空率,为其在高温超导电力装置绝缘中的潜在应用提供参考。One experimentally studied alternative current （AC） breakdown, lightning impulse break- down and stacked effect characteristics of the commercial insulation material KREMPEL-DPF at liquid nitro- gen temperature（77 K）, which compared with at room temperature（25 K）. The material is a PET-film with a diamond pattern epoxy resin coating on one side. Experimental results showed that the breakdown strength of monolayer DPF was 135.6 kV/mm. With the thickness of insulation increasing, the breakdown strength gradually decreases and finally reaches saturation due to stacked effect resulting from multi-layers. The pre- liminary design thickness of the insulation at high voltage class is very small which can effectively reduce the insulation space. The results provide a potential reference for the insulation of HTS power devices.

关 键 词：液氮 绝缘 击穿 冲击 迭层效应 

分 类 号：TB64[一般工业技术—制冷工程] TB66