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高压电器  2015 

220 kV四回高压电缆同相2根并联敷设方式优化研究

DOI: 10.13296/j.1001-1609.hva.2015.12.005, PP. 25-32

Keywords: 高压电缆, 四回同相2根并联, 护套环流, 电流分布, 不均匀系数, 敷设方式

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Abstract:

为了研究220kV四回高压电缆同相2根并联的最优敷设方式,笔者根据高压单芯电缆的等值电路模型,通过软件编程,计算分析了220kV四回高压电缆同相2根并联在“品字形”、“水平交叉”敷设方式下的芯线电流、电流分布的不均匀系数以及护套环流。在此基础上,提出了一种优化的敷设方式,即采用“品字形―水平交叉”复合式的敷设方式,并与前两种方式进行分析、比较。结果表明在“品字形”敷设方式中,具有电流分布不均匀系数大而护套环流小的特点;在“水平交叉”敷设方式中,具有电流分布不均匀系数小而护套环流很大的特点;在优化后的“水平交叉―品字形”复合式敷设方式中,兼具电流分布不均匀系数小和护套环流小的优点。尤其是当电缆按相序BCAABC排列效果最优,电流分布的不均匀系数的最大值为1.0410,最小值仅为1.0103。护套环流的最大值为61.89A,最小值仅为9.14A。

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