Abstract: Generating stations, transmission lines and the distribution systems are the main components of an electrical power system. Generating station and a distribution system are connected through transmission lines.A Power system network may suffer from faults, fault may occur on synchronous generator, bus bar, transmission line, transformer or load. It is important to take precaution for protection of Power system network against faults.It is often seen that during experimentation in the laboratory, circuits are burned out due to excessive current and overload. To prevent this from happening we designed a low cost protection system against over load and excessive current, for this we used electro-magnetic relay in conjunction with IC-LM324 and a 555 timer and designed a circuit in which, when excessive current flows it get disconnected thus keeping the circuit safe.Since in the above circuit the relay has to reset manually after every tripping, we designed another circuit which is reset automatically using the same IC-LM324 and a 555 timer only this time 555 timer works as a pulse sequencer. This acts a phase shifter, which when overload trips and continue to work with the previous load before overload fault occurs by drawing supply from a different phase thus the circuit keeps on working even after fault occurs.
Keywords: Low cost, overload, protection, solution, over current, over voltage.
Title: Low Cost Solution for Overload Protection
Author: AVIK BOSE
International Journal of Electrical and Electronics Research
ISSN 2348-6988 (online)
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