OVERCURRENT PROTECTION. S.Padmini A.P (Sr.G)/EEE Dept. of EEE SRM University Page 2 ... 41 Block diagram of Definite Time over current relay. ... Microprocessor-based over current relay Microcontroller-based over current relay Digital Signal Processor (DSP)-based relays Field Programming Gate Arrays (FPGA)-based over current

Many utilities are applying microprocessor-based overcurrent relays in place of current differential relays to provide fast bus protection. In many cases, utilities do not apply bus differential protection because of

Aug 14, 2014 · Microprocessor Based Over Current Relay Current is taken from C.T. and given to I to V converter because many electronics circuit require voltage signal for operation. The A.C. voltage is converted into D.C. voltage by using rectifier.

May 28, 2018 · Figure shows the block diagram of the microprocessor-based relay. The output of the CT line is given to the input receiver block where the signal is processed. Signal processing includes overvoltage protector, rectifier, smoothing filters, auxiliary CT, …

These designs are based on 8-bit microprocessor which is suitable to be used for over current relay. This paper describes the design of such a general purpose hardware. The designed hardware has been used in microprocessor based relay for …

... overcurrent relay is the simplest form of protective relay which operates when the current in any circuit exceeds a certain predetermined value, i.e. the pick-up value. It is extensively...

A number of desired characteristics such as overvoltage, undervoltage, overcurrent, directional, impedance, reactance, and mho can be used in microprocessor-based relays. In this section, microprocessor-based overvoltage protection has been discussed.

The article considers some issues related to replacement of electromechanical relays used for protection of power facilities with microprocessor relays.

Aug 31, 2018 · In literature, Arduino Uno microcontroller was utilized for overvoltage and overcurrent protection of simple single phase-two terminal systems in [8] and for transformer protection in [7]. Differential protection of transformer technique was proposed using Arduino with GSM and voice circuit in [9].

1 - Over current Protection relay(OCR Relay): Over current relay is an element of relay which is operated after crossing preset limit value of current and time then it provides tripping signal to the circuit breaker tripping coil.