摘要
详述了一次区外接地故障引起发电机匝间保护动作的过程,介绍了匝间保护装置的动作原理及各项定值的计算整定;通过对保护实际动作情况、故障录波数据的分析,重点研究了区外接地故障情况下,纵向零序电压中基波及三次谐波分量的变化规律,结合保护装置的原理、定值设置,指出了用定子绕组三次谐波的变化量去制动基波的变化量的保护原理值得进一步探讨,同时分析了目前保护存在的几个问题;通过计算分析,得到了区外接地故障发生前后负序功率的变化曲线,提出了定子匝间保护的改进建议。
This paper details how the inter-turn protestions of the generator is actuated due to a grounding failure outside the primary power area, introduces the operation theories of the protections and the ways to calculate and set the ratings, It focuses on performing research on the variation discipline of the basic wave and the third harmonci component in the longitudinal zero-sequence voltage under condition of grounding failure outside the area through analysis of the actual operation conditions and on the basis of the failure waveform recorder data. It points out the theory that supports to use the variation of the stator windings＇ third harnomin wave to brake the variation of the basic wave needs further discussion in accordance with the theories and rating settings of the protections, analyzes some problems existing currently in the protections, works out the negative-sequence power variation curve before and after the occurrence of grounding failure outside the area and finally presents some suggestion about improvement of the stator inter-turn protections.
出处
《继电器》
CSCD
北大核心
2007年第16期11-14,共4页
Relay
关键词
发电机匝间保护
纵向零序电压
接地故障
generator interturn protection
longitudinal zero-sequence voltage
ground fault
