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Insulation mode selection of 500 kV double-circuit transmission line in China
Author(s): 
Pages: 40-42
Year: Issue:  3
Journal: ELECTRIC POWER

Keyword:  500kV双回线路雷击跳闸绝缘方式;
Abstract: 对我国500kV同塔双回线路,曾有采用平衡绝缘方式和不平衡绝缘方式2种不同意见.调查我国500kV同塔双回平衡高绝缘方式线路雷击跳闸次数表明,雷击单回跳闸率为0.019次/(100km·a),远低于我国500kV单回线的雷击跳闸率0.136次/(100km·a),雷击双回同时跳闸率为零,平衡高绝缘方式的雷电性能是令人满意的.参照国内外的运行经验,并考虑我国光纤分相电流差动保护的开发和运行,分析了2种绝缘方式的利弊.认为我国500kV同塔双回线路绝缘宜采用平衡高绝缘方式,不宜采用不平衡绝缘方式.采用减小或增大10%的绝缘子片数的不平衡绝缘方式既削弱了一侧的工频绝缘水平,又因不平衡度太小而起不到作用.
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