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Power factor correction (PFC) is a process of negotiating the unwanted effects of electric loads that create a power factor less than one. Power factor correction may be applied either by an electrical power transmission utility to enhance the efficiency of transmission network. In this paper three transformers of different ratings have been used which acts as inductive load each of which produce different power factor variation. The power factor of the supply line is directly monitored by the Power Meter which is connected in parallel to the supply line. The value of the capacitance (capacitor bank) required for correcting the power factor variation due to each transformer and their combination is found out separately. Capacitor bank for the respective load is triggered by using PLC, which connects the capacitor bank parallel to the load and thereby bringing the power factor near to unity. This paper represents the most effective automatic power factor improvement and monitoring by using static capacitors which will be controlled by a PLC with very low cost although many existing systems are present which are expensive and difficult to manufacture. In this study, many small rating capacitors are connected in parallel and a reference power factor is set as standard value into the PLC. Suitable number of static capacitors is automatically connected according to the instruction of the PLC to improve the power factor close to unity. Some tricks such as using resistors instead of potential transformer and using one of the most low cost PLC SIEMENS S7-200 CPU215 DC/DC/DC which also reduce programming complexity that make it most economical system than any other controlling system.
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