文档介绍：第 35 卷第 11 期中国电机工程学报 Jun. 5, 2015
2015 年 6余量，进而改善其空间电荷
unchanged, but the amount was significantly reduced. Under
特性。
HVDC, samples not degassed accumulated large amounts of
heterocharges near two electrodes. Besides, charge amount 关键词：空间电荷；交联副产物；交联聚乙烯；脱气处理
increased significantly as the electric field was strengthened. 0 引言
The internal space charge accumulation in samples degassed
was significantly reduced. In low electric field, there were only 电力传输电缆是一种成本低且运行可靠的供
few homocharges near two electrodes. As the electric field 电装置。聚乙烯作为电缆常用的绝缘材料，具有电
increased, heterocharges gradually became dominant. It 气性能优良、可加工性好、含湿量低、耐化学腐蚀
indicates that, under DC electric field, heterocharges mainly 和低温柔软性能好等优点。后期交联聚乙烯的出
come from the dissociation of cross-linked by-products in 现，进一步改善了绝缘材料的性能，它利用交联效
XLPE. And the higher the electric field is, the more ionic 应来大幅提高其耐热、机械和力学性能。常用的交
charges accumulate. Degassing treatment can effectively
联方式有硅烷交联、高能辐照交联及过氧化物交
reduce the amount of cross-linked by-products in XLPE, so it
联，其中最广泛应用的是过氧化物交联法。用有机
can improve the space charge characteristics.