Design And Construction Of Microcontroller Based Overcurrent Relay

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DESIGN AND CONSTRUCTION OF MICROCONTROLLER BASED OVERCURRENT RELAY Siddhartha Yedida, Huseyin R Hiziroglu Electrical and computer Engineering Department, Kettering University Flint, Michigan, 48504 Abstract— Over-current in a power system is a situation when a larger than rated electric current exists through a conductor, leading to excessive generation of heat, and the risk of fire or damage to equipment Possible causes for over-current include short circuits, excessive load, incorrect design, or a ground fault. This paper presents the design and implementation of a microcontroller-based overcurrent relay for safe, reliable and efficient operation of power systems. Automated overcurrent protection is done by programming a Arduino (microcontroller) with standard ABB moderately inverse relay characteristics where the relay operates automatically in a permissible time whenever there is an over-current (abnormal or fault condition) in a power system [2]. Keywords— Current tap setting (CTS), time-dial setting (TD), Electromechanical relay (EMR), Primary current (Ip), Secondary current (Is), Pick-up current (Ipc), Multiple of Current tap setting (ki), Operation time (t) I. INTRODUCTION Present power system is in need of a high level of redundancy and reliable protection devices along with the periodic maintenance to keep the system healthy. In these circumstances, there is a need for an efficient protection

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