摘要
常规电动机保护采用放大定值倍数躲开启动过程,在启动完成后,定值恢复正常,此时配合反时限保护功能,继电器能够快速的动作于故障,但对于电机频繁过载后的过热保护问题,常规反时限继电器无法实现该保护功能。结合在宝钢的实践应用,通过分析热过负荷的数学模型和实现原理,结合仿真对比,给出了相关时间参数的计算以及过载保护的解决方法。
Motor protection commonly enlarges the value of current set to stand the process of start, after the completion of start, the value of current set returns to normal. This time with inverse time-current characteristic protection, relay can trip on the fault rapidly. But if the motor over loads frequently, inverse time-current characteristic is commonly unable to protect motor. Based on the application in Shanghai Baosteel, through analyzing the model of thermal overload and the principle of implement, and contrast to simulation, this paper gives a method of computing relevant time parameters and overload protection solution.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2009年第8期107-109,113,共4页
Power System Protection and Control
关键词
电动机
热模型
过载保护
motor
thermal model
overload protection
