Abstract: This paper focuses on monitoring and protection of three phase devices using PIC microcontroller and RF transmitter and receiver. Large scale industries very often face the problems of overvoltage, undervoltage, overcurrent, overheating, and earth fault in 3 phases. Hence in order to avoid above mentioned faults, we can protect our 3 phase devices by using various methods. One of the classical approaches is to use contactors, voltage and current relays. But this method is not so popular these days because of the advance features of computers and microcontrollers. The system which we have proposed is a microcontroller based hardware system which will keep track of parameter such as overvoltage, undervoltage, over temperature, earth fault and single phasing. The system is also interfaced using RF module to computer software which will continuously display the values of the parameters. This system is capable to auto restart itself as the parameters recovers.

Keywords: PIC microcontroller, faults, CC2500, overtemperature, singlephasing, monitoring, overvoltage, undervoltage, earth fault.