摘要
传统发电机反时限过流保护认为发电机短时过负荷呈绝热特性 ,过负荷产生的额外热量全部用于定子绕组温升 ,不考虑其散热 ,因此在动作特性上比较保守 ,不能很好地反应热积累过程。在精确分析发电机过负荷热模型的基础上 ,根据定子绕组热平衡过程 ,充分考虑绕组的散热影响 ,提出了新型数字式反时限过流保护判据 ,克服了传统反时限过流保护的缺点 。
Conventional generator's inverse time overcurrent protection assumes that generator overload in short time is adiabatic and its extra quantity of heat is used for a rise in temperature of stator winding with lack considering the heat dissipation, so the trip time of conventional criterion is shorter. After analyzing the heat model with generator overloading precisely, a new criterion for generator's inverse time over current protection is presented based on winding's thermal balance process,it overcomes the shortage of convention criterion, improving the protection's performance.
出处
《电力自动化设备》
EI
CSCD
2000年第3期19-21,共3页
Electric Power Automation Equipment
关键词
数字式发电机
反时限过流保护
继电器
digital protection
inverse-time overcurrent
generator protection
