Problem 1) In the 2-bus radial system seen 12.47 kV on the right, relay 1 isprim

Question

Problem 1) In the 2-bus radial system seen 12.47 kV on the right, relay 1 isprimary protection for bus 1 and relay is (n CTR 100/5 CTR2 2005 backup for bus 1 and primary for bus 2. Both relays are of type L-3 MVA. 5 MVA CO-8, with characteristics given 900 A 1500 A in tertbook, figure 10.12 figure. Bus voltage, load short circuit currents and Tratios are given on the Assume a o 3 sec time delay as a margin between relays, and 6 cycles for breaker operation Assume same power factor for the two loads.

Explanation / Answer

At Normal Loading

Primary current I2= 5000/12.47= 393.7 A

I2secondary= 5*393.7/200= 9.84A

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