The role of soft starter for high voltage motor

- Aug 29, 2019-

The function of soft starter of high-voltage motor: 3-10kv three-phase ac asynchronous motor or synchronous motor cannot be started directly at full voltage when starting. If the full voltage starting current can reach 5~7 times of the rated current, the following risks will occur:

  1. Cause voltage fluctuation of the power grid and affect the operation of other equipment in the power grid;Use the motor soft starter to effectively reduce the starting current, has no impact on the power grid and surrounding electrical equipment;

  2. 2. Large current produces great impact force on the winding and rotating squirrel cage of the motor stator, which will cause loose clamping, coil deformation, and broken squirrel cage bars, etc. In soft start, the impact force will be greatly reduced due to the small maximum current.

  3. For the damage to mechanical equipment, the starting torque when starting directly at full pressure is about 2 times of the rated torque. Such a large torque is suddenly added to the static mechanical equipment, which will accelerate the wear of gears and even make teeth, accelerate the wear of belts and even break the belts, accelerate the wind blade fatigue and even break the wind blade, and so on.Soft start torque will not exceed the rated torque, the above disadvantages can be completely overcome.

To sum up, when using soft start, the above hazards are almost eliminated, so the soft start cabinet has soft start, reduce the starting current, make the motor achieve smooth and stable starting, protect the life of the motor, maintain the life of other electrical equipment, and maintain the starting current below 2.5 times of the rated current;

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