基于发热-散热积累模型的电动机过载保护研究  

Study on motor over-load protection based on heat accumulation-emission model

作　　者：罗建锋[1] 唐轶[1] 陈奎[1] 张丽[1] 

机构地区：[1]中国矿业大学信息与电气工程学院,江苏徐州221008

出　　处：《电力系统保护与控制》2010年第3期95-98,共4页Power System Protection and Control

摘　　要：对异步电动机发热与散热机理进行分析,利用傅氏算法建立了电机热积累-散热的动态数学模型。仿真分析该模型,证明本模型可准确连续模拟电机温升动态变化情况,对避免电动机因定子绕组,转子绕组,定子铁心温度过高而造成损坏提供最优判据。通过与传统反时限保护进行对比,验证了本模型对负载变化引起的热积累反应更准确,敏锐。并在此基础上设计了以ARM芯片LPC2131为主控单元的智能保护器,经过长时间现场运行证明了本方案的可行性。This paper analyzes heat accumulation-emission of asynchronous motor, then establishes a dynamic mathematical model by discrete Fourier transform. It can reflect dynamic changes of motor thermal accurately and continuously, so as to prevent thermal rising too high felicitously. Compared with traditional inverse-time protection, the model can reflect heat accumulation caused by load changes more accurately and more acutely. An intelligentized protector using ARM IPC2131 is designed based on the model. A long time on-site operation proves its feasibility.

关 键 词：异步电动机 发热-散热积累模型:过载保护 ARM 

分 类 号：TM772[电气工程—电力系统及自动化]