Dielectric and Electrical Insulation Properties of PTFE/PP for HTS Power Apparatus Application

2020 IEEE 3rd International Conference on Dielectrics (ICD) Pub Date : 2020-07-05 DOI:10.1109/ICD46958.2020.9342017

M.Y. Wang, B. Du, X.T. Han, Z.X. Liu, Y. Li, Y. Zhang, Jin Li, Z.L. Li, C. Han, Z. Hou

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引用次数: 1

Abstract

Polypropylene laminated paper (PPLP) and liquid nitrogen (LN2) is widely used as insulation and coolant, respectively, in high-temperature superconducting (HTS) cable. Dielectric loss of PPLP plays an important role in the loss of HTS transmission system. In this paper, polytetrafluoroethylene (PTFE) filter papers were chosen to take place of Kraft paper (KP) in composite insulation system. Two layers of PTFE filter paper and one layer of polypropylene (PP) film were processed into sandwich structure through hot-press method. Experimental results show that the dielectric loss can be cut to half by replacing KP with PTFE filter in AC HTS transmission system. The trap level of PTFE/PP composite insulation is shallower. The surface discharge voltage of PTFE/PP is higher than that of PPLP. PTFE/PP also has stronger ability of resisting partial discharge and shows higher partial discharge inception voltage than PPLP does. And the breakdown voltage of PTFE/PP composite insulation is higher than that of PPLP, which mainly due to the stronger resistance to discharge.

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高温超导电力设备用聚四氟乙烯/聚丙烯的介电绝缘性能

在高温超导电缆中，聚丙烯层压纸(PPLP)和液氮(LN2)分别被广泛用作绝缘和冷却剂。PPLP的介电损耗在高温超导传输系统的损耗中占有重要的地位。本文选用聚四氟乙烯(PTFE)滤纸代替牛皮纸(KP)用于复合绝缘系统。采用热压法将两层PTFE滤纸和一层聚丙烯(PP)薄膜加工成夹层结构。实验结果表明，在交流高温超导传输系统中，用聚四氟乙烯滤波器代替KP滤波器可使介质损耗降低一半。聚四氟乙烯/聚丙烯复合绝缘的疏水层较浅。PTFE/PP的表面放电电压高于PPLP。PTFE/PP抗局部放电能力更强，局部放电起始电压比PPLP高。PTFE/PP复合绝缘的击穿电压高于PPLP，这主要是由于PTFE/PP复合绝缘的抗放电能力更强。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2020 IEEE 3rd International Conference on Dielectrics (ICD)

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