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相电流差突变量选相在混压同塔输电线跨电压故障中的适应性分析

, PP. 118-126

Keywords: 跨电压故障,单相跨单相接地,混压同塔四回线,复合序网图,选相,相电流差突变量

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Abstract:

混压同塔四回线易发跨电压故障。对方向或距离纵联保护而言,故障选相非常重要。以弱电强磁的混压同塔四回线系统中单相跨单相接地故障为例,提出了一种将混压同塔四回线路进行完全解耦的复合序网图故障分析方法,并分析在此工况下与实际中所用的简化计算方法下相电流差突变量之间的差异,最后得到相电流差突变量选相适应性与两系统电源电动势相角之间的关系。分析表明,当电源电动势相角之差在不同的范围内时,相电流差突变量选相适应性不同,给出了不同适应性情况下分别对应的相角范围。最后,利用PSCAD软件建立了一个500kV/220kV同塔四回线路模型,验证了理论分析的可靠性。

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