At present, a large number of AC asynchronous motors are used in industrial and mining enterprises, most of which adopt direct starting mode. Direct starting is the simplest way to start, starting the motor through the knife or contactor directly connected to the power grid. The advantage of direct starting is that the starting equipment is simple and the starting speed is fast, but the harm of direct starting is great: (1) power grid impact: Excessive starting current (no-load starting current up to 4 to 7 times the rated current, starting with load up to 8 to 10 times or greater), will cause the grid voltage drop, affect the normal operation of other electrical equipment, may also cause undervoltage protection action, resulting in harmful tripping of equipment. At the same time, too large starting current will make the motor winding heat, thus accelerating insulation aging, affecting the life of the motor; (2) mechanical impact: excessive impact torque often causes the motor rotor cage bar, end ring fracture and stator end winding insulation wear, resulting in breakdown, shaft distortion, coupling, transmission gear damage and belt tear; (3) Impact on production machinery: pressure sudden change in the starting process often causes damage to the pump system pipeline and valve, shortening the service life; It affects the transmission accuracy and even the normal process control. All these pose a threat to the safe and reliable operation of the equipment, but also cause excessive starting energy loss, especially when the frequent start and stop is even more so.
In order to solve the above problems, we developed the high voltage motor soft starter . Each phase is composed of a series of connected thyristor components, and the voltage on the stator side of the motor is slowly increased during starting to achieve the purpose of voltage reduction starting. The perfect motor protection function ensures that the motor can be protected in time when the fault such as lack of phase, phase current imbalance, overvoltage and undervoltage occurs during the starting process.
Using the motor soft starter to control the starting of the motor can effectively solve the above problems caused by direct starting.
Post time: Nov-11-2023