Central Power Researoh lnstitute B a n g a l o r e -560 094
India.Abstract-Delta connected capacitor banks employed for power factor improvement are normally switched in and out using antiparallel thyristors. The configuration requires six thyristors which increase the total cost of the system.A novel scheme is presented by which thyristors with antiparallel diodes and one resistor will be sufficient t o switch in the delta connected capacitor bank with minimum surge current. The resistor supplies only the initial charging current to the capacitors and hence can be of reasonably low wattage. Extensive simulation results have been presented in justification of the scheme.
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