Introduction to Microprocessor Based Relays Electronics Project:


Due to advancements in microprocessor technologies the switch from conventional to microprocessor based relays has increased. By use of microprocessor technologies the cost of maintenance has decreased. This paper discusses the design and working of microprocessor based relays for ac motors.

Brief into working process:

These are provided with data acquit ion systems which control the ac input. Memory modules maintain the relay algorithms which switch the relays according to the specified algorithms. Contact inputs are provided to control the relays and contact outputs are used for controlling the other equipment. The sampler converts the voltage and current inputs to digital quantity and provides it to the microprocessor.  For controlling ac motors they are fed to motor protective relays which protect them from open phase and reverse phase voltages. Motor protectective relays can control the overload conditions and over current time elements. Motor protective relays are designed based on sine wave form and the distortions occurring can be easily controlled. By connecting a advance phase capacitor the harmonics generated in the circuit can be controlled.

Advantages and Applications:

By use microprocessor based relays the switching can be obtained at higher rates with low maintenance   cost. The time taken for restoration is very less when bugs occur. It has low installation process and provides a controllable and reliable output. These protect he motors from break failures an fuse blown situations. By using the microprocessor based relays the faults can be easily identified and restored immediately.

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