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故障电流冲击下高温超导电缆磁-热耦合特性数值计算与分析

DOI: 10.13334/j.0258-8013.pcsee.2015.12.031, PP. 3176-3181

Keywords: 冷绝缘高温超导电缆,故障电流,电流分布,温度分布,磁热耦合计算,YBCO

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Abstract:

冷绝缘高温超导(colddielectrichightemperaturesuperconducting,CDHTS)电缆在电力系统输电运行中,不可避免地会受到故障电流的冲击。在故障持续时间内,超导电缆产生大量热量,导致温度升高,从而使超导电缆由超导态向正常态转变,对超导电缆载流性能产生影响。通过建立故障电流下超导电缆等效电路模型与热传导模型,提出了超导电缆在故障电流冲击时的各层电流瞬态分布解析算法,通过耦合电磁计算与传热分析模型,提出了超导电缆故障电流冲击下的温度分布数值计算法。最后,对110kV/3kA冷绝缘高温超导电缆在25kA、持续3s故障电流冲击时的电流分布和温度分布情况进行了计算分析。结果表明:在故障时间内,伴随导体层温度逐渐上升,各个导体层电流呈下降趋势,各层的温度在92K前后上升速率不再相同,铜骨架承受近96%的故障电流,分流作用明显。分析结果为设计故障电流冲击下超导电缆的故障保护策略提供了参考依据,对保障超导电缆的稳定运行具有指导意义。

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