摘要
Abstract
Lightning or arc grounding overvoltage often cause damage on components in high voltage power distribution cabinet or even explosion , which is the main cause of equipment damage in substation. Once the failure occurs, it will result in widespread and long-time blackout. Current protection modes of arc suppres-sion and lightning protection measures are improved by searching for failure reason of arc suppression cabinet and analyzing the principle of arc suppression. After installing zero-sequence current transformer on substation incoming cable, it can be determined whether arc grounding happens inside or outside the substation depend-ing on the direction of zero-sequence current in case of single-phase arc grounding. For arc grounding over-voltage inside the substation, arc suppression controls are adopted; for that outside the substation, alarming measures are employed. Thus, the unnecessary arc suppression control as well as the metal grounding times of system caused by arc suppression control can be reduced.关键词
雷电波/单相弧光接地/弧光过电压/消弧控制/零序电流Key words
lightning wave/single-phase arc grounding/arc-overvoltage/arc suppression control/zero-se-quence current signal分类
信息技术与安全科学
