Question: In the figure, two 220/110kV transformers supplying three loads. A three-phase fault occurred at one of the feeders with IFI-3894. A referred to 110

In the figure, two 220/110kV transformers supplying three loads. A three-phase fault occurred at one of the

In the figure, two 220/110kV transformers supplying three loads. A three-phase fault occurred at one of the feeders with IFI-3894. A referred to 110 kV side. Calculate the Ipickup, linst and TMS setting of overcurrent relays 2 and 4 of the transformer 1 (T1) if the settings of OC relay#1 are Ipickup 100% and TMS 0.1, Allow for a 125% overload for the power transformer TL Use linst 8 pickup, and OC Relay VI 13.5 curve: t = TMS Relay Ipickup (A) Tinst (A) TMS 1 1 -1 8 0.14 2 4 Source 10000MVA 220 kV Bus Oo Is 600/1 Bus P 220KV 200/1 200/1 220/110KV SOMVA Z-12.5% T2 220/110KV SOMVA 400/1 400/1 -0 110 kV Bus Bus Q 110KV 500/1

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