A simple system with circuit breaker-relay locations is
Chapter , Problem 10.23(choose chapter or problem)
A simple system with circuit breaker-relay locations is shown in Figure 10.49. The six transmission- line circuit breakers are controlled by zone distance and directional relays, as shown in Figure 10.50. The three transmission lines have the same positive-sequence impedance of j0.1 per unit. The reaches for zones 1, 2, and 3 are 80, 120, and 250%, respectively. Consider only three-phase faults. (a) Find the settings Zr in per unit for all distance relays. (b) Convert the settings in W if the VTs are rated 133 kV: 115 V and the CTs are rated 400: 5 A. (c) For a fault at location X, which is 10% down line TL31 from bus 3, discuss relay operations.
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