are used to compensate for the idling output which occurs with an inductive consumer such as an induction furnace. At 50 Hz, approx. 4.5x the level of the effective output is needed as the condenser output, if the system is being oper- ated at 250 Hz, approx. 7.5x the level needs to be taken into account, and for sys- tems operating at 500 Hz, the figure is approx. 11x the effective output.
500 Hz – 1,000 kW – 11,000 kVar 250 Hz – 1,000 kW – 7,500 kVar 50 Hz – 1,000 kW – 4,500 kVar
Mains frequency condensers are as a rule air-cooled, while medium-frequency condensers from approx. 100 Hz are produced as water-cooled units.