船用三相异步电动机的保护

Protection for Three Phase Marine Asynchronous Motor

介绍了船用三相异步电动机的保护与控制关系,以及船用三相异步电动机的各种保护装置。电动机保护主要有两大类:采用电流检测型的有热继电器,带有热-磁脱扣的电动机保护用断路器,电子式和固态继电器,带电子式脱扣的电动机保护用断路器及软起动器;直接检测电动机绕组温度的温度检测型有双金属片温度继电器、热保护器、检测线圈和轴承铂热电阻传感器等。指出不管采用何种保护装置,必须考虑过载保护装置与电动机、过载保护装置与短路保护装置的协调配合。

The relationship between protection for three phase marine asynchronous motor and how to control as well as all kinds of protection device was introduced. There are two main protection： one of them is thermal relay detecting by current, this relay include circuit breaker controlled by thermal magnetic tripping, electronic and solid- state relay and circuit breaker controlled by electronic tripping and the soft starter. The other protection device is kind of detecting the temperature of winding directly including temperature relay with double metal plate, thermal protection device, platinic resistance sensor and so on, end of article sum up all kinds of protection device, whichever protection device is chose, first of all considering the coordination between overload protection device and protection for motor, between overload protection device and protection for motor must be considered.