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POWER FACTOR MEASUREMENT AND CONTROL It is used to measure and control Power factor usingPIC16F877. It consists of Current Transformer, Potential Transformer, Precision Rectifier, bridge Rectifier, Micro controller unit, Keypad and Liquid crystal Display. Maintaining of power factor in between 0.8 to 1 is the industrial standard, by using this system we can maintain that standard with the help capacitor bank. Current Transformer: Purpose of Current transformer is to sensing of current with respect to load. Main property of the current transformer is change in secondary voltage with respect to load current in primary. Potential Transformer: Main property Potential Transformer is change in secondary voltage with respect to Primary voltage. It is used to step down voltage process because normally in the circuit we will use low voltage device. Precision Rectifier: Output of current Transformer voltage is less than 0.7 voltage due to can't rectified by normal rectifier, if rectify below 0.7 voltage used in Precision Rectifier. The output is connected to the one of the Exclusive OR gate input. Micro controller unit: To control of all part of this unit used in Micro controller unit,power factor value set in the unit throughout keypad and present power factor value displayed through Liquid crystal display. Capacitor Bank: If you need power factor value is increased, the capacitor bank connected with load. The capacitor bank in each capacitor connected with load via Relay.