数字式发电机反时限过流保护研究  

Study of Digital Protection for Generator's Inverse-Time Overcurrent

作　　者：郑华[1] 陆于平[2] 

机构地区：[1]国电南京自动化股份有限公司,江苏南京210003 [2]东南大学电气工程系,江苏南京210096

出　　处：《电力自动化设备》2000年第3期19-21,共3页Electric Power Automation Equipment

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.

关 键 词：数字式发电机 反时限过流保护 继电器 

分 类 号：TM310.73[电气工程—电机]