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电网技术  2011 

HVDC工程交/直流滤波器高压电容器不平衡保护的判据研究

, PP. 229-234

Keywords: 高压直流输电,滤波器,高压电容器,电容器不平衡保护

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Abstract:

为检测电容器内部元件的损坏故障,高压直流输电(highvoltageDCtransmission,HVDC)工程中交直流滤波器的高压电容器通常采用H形接线或分支接线形式,进而配置电容器不平衡保护作为反映该类故障的主保护。然而一些HVDC工程中电容器不平衡保护仍存在隐患。为此分别针对上述2种接线形式的电容器,定量推导了单个支路电容器的故障发展过程中及2个支路电容器均有电容元件击穿时的不平衡电流及相应过电压倍数。分别对2种接线的电容器不平衡保护提出了实用的判据,并探讨了相应的整定计算原则及动作策略。

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