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Thanks to jbartos, Marke & electripete - I appreciate all your input, and will definitely get a "Alternating Current Machines" by M.G. Say. The softstart stack is in the process, the cables are being laid and hopefully everything will be in place by the end of the month. I will...

Thanks to jraef, aolalde and Marke. The idea was to use a multi-stage resistor. If the formula : R= (0.11)V/I applies to a single stage resistor, how do i calculate a resistor for eg. a) 0 - 30% speed, b) 31 - 60% speed and c) 61 - 100% Speed / Short circuit. We have a speed monitoring sensor...

Thanks skoqsqurra for the comments. I will contact consultants in our area for inputs. Regards BartholomeusNel

We are about to install a WRIM onto a Ball Mill in a reduction Plant.The intended motor has a rating of 446A, 525V (Stator) and 320A, 600V (Rotor). A 22kV, 415kVA transformer is allocated to solely supply this motor. We would like to start the motor as 'soft' as possible to reduce stresses on...