• Dr.Kola Sambangi Sambaiah
• Malatesh Akkur

Power system is a wide area of research. Power’s systems protections are the part within power system. Power system protection basically means to protect the equipments like generator, transformer, transmission line, motor etc. from fault. The equipments that used for protection of power system are fuses, isolator, relay, circuit breaker etc. In this research two systems are considered one is radial system and other is ring system. Both systems are calculated for fault where relay arrangement has been shown. After the fault on system, primary relay and back up relay trip setting has been done according to level of fault. In this research for radial system it is found that relay R5 is the primary relay trip in 0.10 second which is connected with the circuit breaker 5 and back up relays operate after .30 second. Similarly, for ring system it is found that relay R5 is the primary relay trip in 0.10 second which is connected with the circuit breaker 5 and back up relays operate after .30 second.

Circuit breaker (CB), Protection System, Primary Relay, Backup relay, Radial System, Ring System.

"Time Analysis of Primary and Backup Relay", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 2, page no.207-211, February-2019, Available :http://www.jetir.org/papers/JETIREV06033.pdf

"Time Analysis of Primary and Backup Relay", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 2, page no. pp207-211, February-2019, Available at : http://www.jetir.org/papers/JETIREV06033.pdf