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  • Thanks to Energy or KVA rationing by the Electrical Authorities to the industry, the industry concentrates now more on KVA than the KW consumed.
  • The above instance shows each of your loads above 50 HP is to be compensated by external capacitor, if the industry wants maximum production for the given KVA sanction.
  • In practice, the safety of the electrical distribution is ensured provided the motor’s lagging current is always higher than the correcting capacitor’ s leading current.
  • A 50 HP motor when compensated by the capacitor can reduce the electrical distribution KVA burden by 17 % and this is the chance now the industry should think of implementing this correction now. That is we are maximizing the KW consumption for the given KVA.
  • To assess the electrical distribution losses, power factor at load end is the practical tool.
  • The industry checks the capacitor for its efficiency by measuring its input current.  It is wrong but the capacitor is to be checked for its output only for the given input current. If it is much more or less than the rated current, then the capacitor is not an asset to the industry but its liability.
  • To check the capacitor for its output on the given load, the power factor at the incoming of load must increase when capacitor is switched on the running load. For the same running load, the power factor must decrease at the incoming of load when the same capacitor is switched OFF. The amount of increase / decrease in power parameters like KW, KVA, KVAR, and PF indicates the rating of the capacitor.
  • Best operating Practice in the industry – The user has provided capacitor at the motor Delta contactor outgoing end or at motor terminals, but we have to add one more timer and MCB between capacitor contactor & motor contactors. This timer will delay the capacitor to come on line after the motor starts by 20 sec. This avoids same instant starting of motor and capacitor. Motor inrush current is around 6 times the rated current. Whereas capacitor inrush current is around 12 times the rated current. Capacitor is there at motor end to reduce the motor burden and not to aggravate  starting spikes in distribution network.
  • Please check have you compensated your motor at load end & checked working OK?

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