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The relay is very important part of a power system to protect the electrical power system from the disturbances. The new proposed relay is overcurrent relay OCR that be used to protect the devices from any increasing of setting current. The new designs of OCR based on embedded system that used to emulate two characteristics: Instantaneous and Definite Time, The Instantinious work directly without any wait when the current exceed the max current that causes system damage, the other type is working when the passing current exceeded the setting current and at the same time the current continuous in a period of time. The proposed circuit which is used with three-phase power system load depending on the Arduino Mega as a main controller of OCR. The experimental results showed the reliability, sensitivity and flexibility under different operation conditions. This relay was tested on the modern electric system from (Audubon company) to several cases and the results showed the efficiency of the proposed OCR to protect the system.

Design and Implementation a New Real Time Overcurrent Relay Based on Arduino MEGA