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Overload and differential protection of motor for K institutions with motor

May 07, 2019

The motor of the K institutions with motor is a comprehensive protection for the motor. When it is used, the motor has overload, phase loss, stall, short circuit, over voltage, under voltage, leakage, three-phase unbalance, overheating, bearing wear, stator and rotor eccentricity. When the axial yaw is bouncing, it is alarmed or protected; the device that protects the motor is the motor protector, including the thermal relay, the electronic protector and the intelligent protector. The large and important motors generally adopt intelligent protection devices.


Overload protection of motor for K mechanism


The coil of the motor for the K mechanism is usually wound by a very thin copper wire, and the ability to withstand current is poor. When the motor load is large or the motor is stuck, the current flowing through the coil will increase rapidly, and the temperature of the motor will rise sharply, and the copper wire winding will be easily burned. If the polymer PTC thermistor can be connected in series with the motor coil, it will provide timely protection when the motor is overloaded to prevent the motor from being burnt. The usual protection circuit is shown below. The thermistor is usually placed near the coil so that the thermistor is more susceptible to temperature and makes the protection more efficient and effective.


Differential protection of motor for K mechanism


Motor differential protection with differential quick-break protection and dual ratio differential protection with or without second harmonic braking. It can be used for three-side differential current input (three-turn), with simulation of voltage and current of primary equipment. Complete and powerful acquisition function of quantity and switch quantity, equipped with standard RS485 and industrial CAN communication port, and realize three-turn main change differential protection, two-turn main change differential protection, two-turn distribution differential protection, power generation through reasonable configuration Protection and measurement and control functions such as differential protection, motor differential protection and non-electricity protection.