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变压器中性点运行方式对220kV电网接地保护的影响

Journal of Jiangxi Vocational and Technical College of Electricity(2016)

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Abstract
220kV系统受负荷切换或事故处理等因素影响,需频繁对系统中变压器的中性点接地刀闸进行操作,考虑到中性点接地方式可能对220kV线路后备保护动作可靠性产生影响,故模拟220kV系统接地故障并对保护定值进行整定校验,以验证保护动作可靠性.通过对典型接线方式的220kV系统接地保护定值的整定配合,进行线路接地故障模拟并分析,证明变电站主变中性点接地运行方式的改变,对所接220kV线路接地距离保护和零序过流保护各段均不产生影响.
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