基于部分放电的发展,对具有突起缺陷的直流XLPE电缆的恶化过程进行分析
Yunjie Zhou1, Shuting Yang1, Jiamin Xu1
1State Grid Shanghai Cable Company, Shanghai, China.
PloS one
|June 25, 2025
概括
高压直流 (HVDC) 电缆的内部半导体突出缺陷加快了绝缘降解. 部分放电实验揭示了后期阶段活动的增加,表明通道发展和即将发生的故障,这对HVDC电缆安全至关重要.
科学领域:
- 电气工程 电气工程
- 材料科学 材料科学 材料科学
- 电力系统 电力系统
背景情况:
- 高压直流 (HVDC) 电缆对于高效的长距离电力传输至关重要,特别是用于可再生能源的整合.
- 交联聚乙烯 (XLPE) 是一种标准的绝缘材料,但诸如突出之类的制造缺陷可能会损害其完整性.
- 这些缺陷可以启动部分放电 (PD),导致HVDC电缆绝缘的加速退化.
研究的目的:
- 为了研究在特定电压下HVDC电缆绝缘中内部半导体突出缺陷的行为.
- 分析部分放电发展的阶段及其与隔热降解的相关性.
- 提供数据,以提高HVDC电缆的设计,制造和维护协议.
主要方法:
- 在含有突出缺陷的HVDC电缆绝缘模型上进行了部分放电实验.
- 实验是在50°C的控制温度和80kV的电压下进行的,并遵守IEC 60270标准的PD测量.
- 在不同的阶段监测和分析放电过程,以了解PD活动的进展.
主要成果:
- 在实验阶段,特别是第四阶段,部分放电活动显著增加.
- 这种增加的活动与绝缘内排放通道的加速发展有关.
- 这些发现表明,突出缺陷,PD升级和绝缘断裂风险之间存在直接联系.
结论:
- 突出缺陷对高压直流电缆绝缘的长期可靠性构成重大风险.
- 了解部分放电的分阶段进展是预测和减轻绝缘故障的关键.
- 这项研究为提高HVDC输电系统的安全性和寿命提供了关键的见解.
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