Direct selling 55kW auto starting cabinet, internally connected with QZB auto transforme

  The self coupling decompression starting box is applicable to the three-phase squirrel cage induction motor with AC 380V (660V) power to 300 (500) kW
It is used for step-down starting
The step-down method of autotransformer is used to improve the impact on the power grid when the motor is started Starting performance
When the self coupling decompression starting box starts the motor, the starting current of the power incoming line shall not exceed 3 ~ 4 times of the rated current of the motor, and its maximum starting time is 2 minutes (including the sum of one or several consecutive starting times)
If the sum of continuous starting time 98 has reached 2 minutes, the cooling time of starting shall not be less than 4 hours before starting again
Therefore, this product is only used for long-term intermittent starting, Not suitable for use under frequent operating conditions

product mix
This product is a box type protective structure, which is composed of autotransformer, AC contactor, intelligent digital display motor protector (time relay, time relay) and other components
For products of 75kW and below, it adopts automatic control mode
Products of 80kW and above have manual and automatic control modes, which are switched by change-over switch
The intelligent digital display motor protector can automatically adjust and control the starting time within 0 ~ 240 seconds, The autotransformer is equipped with two groups of taps with rated voltage of 60% (65%) and 80%, which are connected to 60% (65%) taps when leaving the factory
If the user needs to use large starting torque, it can be connected to 80% taps, and has overload, phase failure and voltage loss protection

technical specifications
  1
Current setting value of motor protector and thermal relay of starting box: for those with 75kW and below, the setting current of protector is equal to or slightly greater than the rated current of motor, but shall not be greater than 1
05 times of the setting current of motor

2
For those above 115KW, the setting current is equal to the rated current of the motor multiplied by the transformation ratio of the current transformer in the control box

 
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