Three-zone mho relays are used for transmission line
Chapter , Problem 10.2(choose chapter or problem)
Three-zone mho relays are used for transmission line protection of the power system shown in Figure 10.25. Positive-sequence line impedances are given as follows. Line Positive-Sequence Impedance, W 12 6 _ j60 23 4 _ j40 24 5 _ j50 Rated voltage for the high-voltage buses is 500 kV. Assume a 1500: 5 CT ratio and a 4500: 1 VT ratio at B12. (a) Determine the settings Zt1, Zt2, and Zt3 for the mho relay at B12. (b) Maximum current for line 12 under emergency loading conditions is 1400 A at 0.90 power factor lagging. Verify that B12 does not trip during emergency loading conditions.
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