- Problem 2 Relay R In Fig 1 Is One Of The Idmt Phase Overcurrent Relay Of Three Overcurrent And One Earth Fault Scheme 1 (45.7 KiB) Viewed 68 times
PROBLEM 2: Relay R in Fig. 1 is one of the IDMT phase overcurrent relay of three overcurrent and one earth fault scheme
-
- Site Admin
- Posts: 899603
- Joined: Mon Aug 02, 2021 8:13 am
PROBLEM 2: Relay R in Fig. 1 is one of the IDMT phase overcurrent relay of three overcurrent and one earth fault scheme
PROBLEM 2: Relay R in Fig. 1 is one of the IDMT phase overcurrent relay of three overcurrent and one earth fault scheme having normal inverse characteristic. It is connected on 132 kV transmission line with its normal plug setting range 50-200% of 1 A in step of 25%. The time dial setting (TDS) range of relay R is 0.1 to 1 s in steps of 0.05 s. The CT ratio is 500/1 A. If load on the 132 kV line is 100 MW with 0.98 power factor then determine plug setting (PS) of the relay R. Further, if phase-to-phase fault occurs at 50 km from the relay with a magnitude of 4000 A, determine its time of operation using standard relay formula. Assume set value of TDS of relay R is 0.5. 500/1A 132 kV line R Fault Fig. 1 Single line diagram of a portion of power system network