摘要
为了确保差动保护在变压器正常运行或区域外故障时不误动、区内故障时能够灵敏正确地动作,对Y_0/△-1变压器差动保护补偿算法进行分析,证明2种常规相位补偿方式中的去零序处理会对保护灵敏度造成影响,提出利用变压器中性点零序电流构成的差动保护是一种较为完善的保护方式。通过一起实际案例分析结果表明:应用中应重点关注保护装置的相位补偿方法;幅值补偿是基于基准侧而言的,所以在差动保护中基准侧的明确是至关重要的,对于整定计算非常必要;具有正确、完善的相位补偿和幅值补偿才可确保变压器差动保护不误动、不拒动。
In order to avoid transformer differential protection misoperation when a fault occurs outside the normal operation region and sensitively operate in the region, the paper analyzes Y0/△-1 compensation algorithm for the transformer differential protection, points out that the impacts of suppressing the zero sequence component on the protection sensitivity occur in two kinds of conventional phase compensation modes, and proposes transformer neutral point zero sequence current based differential protection, which is a perfect method. Combined with a practical case, the paper focuses on the phase compensation methods for the protection device in application. It is key to amplitude compensation to determine the benchmark-side in the differential protection, which is necessary for setting calculation. The accurate phase and amplitude compensation makes the correct action rate of the transformer differential protection higher.
作者
赵曙伟
ZHAO Shuwei(Suzhou Nuclear Power Research Institute, Shenzhen 518120, China)
出处
《智慧电力》
2017年第10期95-100,共6页
Smart Power
关键词
变压器
差动保护
不平衡电流
相位补偿
幅值补偿
零序电流
transformer
differential protection
unbalanced current
phase compensation
amplitude compensation
zero sequence current
