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Block Diagram of Thyristor switched RPC System.In addition to not being able to achieve the desired power factor it is also possible

that the use of fixed compensation can also result in leading power factor undercertain load conditions. This is also unhealthy for the installation as it can result inover voltage, saturation of transformers, etc. It is therefore necessary to automaticallyvary without manual intervention, the compensation to suit the load requirements.Some loads (such as welding equipments, injection moulding equipment, starting oflarge induction motors, traction loads) which demand, under certain operatingconditions, large amount of reactive power for very short duration of time. Thyristorswitched automatic power factor correction system (Fig) is used in this applicationwhich have a response time in milliseconds. In this system, it is possible to switch incapacitors such that the inrush transient currents are totally eliminated. In additionthe capacitors can be switched repetitively intent any limits since, there is no needfor allowing discharge of the capacitor before it is switched in.

EXPERT SYSTEMS AND SOLUTIONS48, North Street, Aranarai, Perambalur, Tamil Nadu, India.Email ID: expertsyssol@yahoo.com,Website: www.researchprojects.infoPhone: 9952749533,THYRISTOR SWITCHED REACTIVE POWER COMPENSATION