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电网技术  2014 

绝缘子串并联保护间隙的爆轰气流灭弧方法

DOI: 10.13335/j.1000-3673.pst.2014.05.036, PP. 1358-1365

Keywords: 并联保护间隙,后续工频电弧,爆轰气流,快速灭弧,雷击跳闸,数值模型,灭弧实验

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Abstract:

输电线路绝缘子串并联保护间隙受雷击闪络后无法主动快速地熄灭后续工频电弧,不能有效地阻止雷击跳闸。研究了一种主动式、快速地爆轰气流灭弧装置,装置安装于并联间隙电极之间,当雷击并联间隙形成工频电弧时,装置受到雷电流信号触发同步产生爆轰气流,能够以远小于继保装置的最快响应时间熄灭后续工频电弧,从而避免继保装置动作,有效地阻止雷击跳闸。建立了爆轰气流灭弧的数值模型,通过仿真分析得到近似理想状态下的爆轰气流灭弧时间为0.08ms以内;灭弧实验证明爆轰气流在0.4ms以内熄灭电弧,两者得到的灭弧时间均远小于继保装置的最快响应时间,其误差在可接受范围内,由此验证了爆轰气流灭弧的有效性和可靠性。

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