软起动器具有哪些保护功能？
What protection functions do soft starters have
（1）过载保护功能：软起动器引进了电流控制环，因而随时跟踪检测电机电流的变化状况。通过增加过载电流的设定和反时限控制模式，实现了过载保护功能，使电机过载时，关断晶闸管并发出报警信号。
(1) overload protection function: the soft starter introduces the current control ring, thus tracking and detecting the change of the motor current at any time. By increasing the overload current setting and anti time control mode, overload protection function is realized, so that when the motor is overloaded, the thyristor is turned off and the alarm signal is sent out.
（2）缺相保护功能：工作时，软起动器随时检测三相线电流的变化，一旦发生断流，即可作出缺相保护反应。
(2) lack of phase protection function: when working, the soft starter detects the change of three phase line current at any time. As soon as the current breaks down, the phase protection reaction can be made.
（3）过热保护功能：通过软起动器内部热继电器检测晶闸管散热器的温度，一旦散热器温度超过允许值后自动关断晶闸管，并发出报警信号。
(3) overheating protection function: the temperature of the thyristor radiator is detected through the internal thermal relay of the soft starter. Once the radiator temperature exceeds the allowable value, the thyristor can be shut off automatically, and the alarm signal is sent out.
（ 4 ）其它功能：通过电子电路的组合，还可在系统中实现其它种种联锁保护。
(4) other functions: through the combination of electronic circuits, other interlocking protection can be realized in the system.
