26/35kV及以下电压等级聚丙烯电缆绝缘厚度优化  

Optimization of Insulation Thickness for Polypropylene Cables of 26/35 kV and Lower Voltage Grades

作　　者：公维来 杨建华 周雁 GONG Weilai;YANG Jianhua;ZHOU Yan(Shanghai Electric Power Group Transmission and Distribution Equipment Co.,Ltd.,Shanghai 200042,China;Shanghai Huapu Cable Co.,Ltd.,Shanghai 201111,China)

机构地区：[1]上海电气集团输配电装备有限公司,上海200042 [2]上海华普电缆有限公司,上海201111

出　　处：《电线电缆》2025年第2期24-30,共7页Wire & Cable

摘　　要：聚丙烯绝缘材料具有优良的电气性能及可循环再利用等特点,被认定为下一代电缆绝缘材料。为了进一步提升聚丙烯电缆的性能并延长使用寿命,文中分析了聚丙烯电缆相校于现行交联聚乙烯电缆绝缘厚度减薄的可行性。针对聚丙烯电缆,在其运行温度下开展寿命指数试验和逐级击穿试验,确定聚丙烯绝缘材料在不同电压试验下的耐受电场强度,进而对中压聚丙烯电缆绝缘厚度进行优化设计。将26/35kV、8.7/10kVPP电缆绝缘厚度分别减薄至8.5mm和3.5mm,并对绝缘厚度优化后的聚丙烯电缆进行型式试验;试验结果表明,绝缘厚度优化后的聚丙烯电缆可靠性满足要求,同时绝缘厚度的减薄可进一步提高聚丙烯电缆的载流量。Polypropylene(PP)insulation material is recognized as the next generation of cable insulation material due to the excellent electrical properties and recyclability.In order to further enhance the performance and service life,feasibility of reducing insulation thickness of PP cables relative to cross-linked polyethylene(XLPE)cables was analyzed.Withstand field strength of PP insulation material under different voltages was determined at operation temperature through step-by-step breakdown test and life index test.By the tests mentioned above,optimization for insulation thickness of medium voltage PP cables was carried out.Insulation thickness of 8.5 mm and 3.5 mm were proposed for 26/35 kV and 8.7/10 kV PP cables respectively,and type tests on PP cables with optimized insulation thickness were conducted.Results showed that reliability of cables with optimized insulation thickness met the requirements.Besides,current carrying capacity of PP cables could be increased after thickness reduction.

关 键 词：聚丙烯电缆 寿命指数 最大电场强度 绝缘厚度 

分 类 号：TM247[一般工业技术—材料科学与工程]