Implementation Of Solid State Relays For Power System Protection
Nidhi Verma, Kartik Gupta, Sheila Mahapatra
KEYWORDS: Load, Microcontroller, opto-isolator, Relay, Software, Solid State Relays, Zero voltage switching
ABSTRACT: This paper provides the implementation of solid state relays for enhancement of power system protection. Relays are an essential part of the power systems and are responsible for the control of any overload voltage or current and protection of the devices from these parameters. The main function of the relay is to constantly monitor the parameter to be controlled and if it exceeds the percentage range set by the controller then it sends a signal to the circuit breaker to break the connection and isolate the faulty part. Solid state relays are preferred over mechanical relays and in this paper relay functioning is done with the help of opto-coupler. Controlling of opto- coupler is done with the help of microcontroller. Circuit operates through Zero Voltage Switching leading to reduction in harmonics. The implementation of relay circuit offers minimal delay time which enables better time response for protection.
 Three phase solid state relays – POWERSEM- www.powersem.net
 Anil Kumar Reddy. K, Sirisha. S.,”A ZVS DC-DC CONVERTER WITH SPECIFIC VOLTAGE GAIN FOR INVERTER OPERATIONUSED FOR 3-PHASE INDUCTION MOTOR OPERATION” International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering, Vol. 2, Issue 8, August 2013
 Why use solid state relays? - www.crydom.com
 Claude E. Shannon, “A symbolic analysis of relay and switching circuits”, book, IEEE press
 Kevin R. Sullivan, “Understanding relays”- autoshop101.com
 Relay Systems, by I. T. Monseth and P. H. Robinson, McGraw-Hill Book Co., New York, 1935.
 Relays, National Plastic Heater Sensor and Control Co., www.nphheaters.com
 Solid state relays- www.omega.com