Q2. For each set of voltages state whether or not the voltages form the balanced 3-phase set. If the set is balanced, state whether the phase sequence is positive or negative. If the set is not balanced explain why. a) va = 48 cos(314t 45°) V, vp = 48 cos (314t 165°) V, ve = 48 cos (314t + 75°) V. b) va 188 cos(250t + 60°) V, 188 cos 250t V, 188 cos (250t 60°) V. c) va = 426 cos 100r V, U 3D 462 cos(100t + 120°) V, ve = 426 cos(100t 120°) V. d) va 1121 cos (2000t 20°) V, %3D | = 1121 sin (2000t 50°) V, - 1121 cos (2000r + 100°) V.

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Fault Analysis

In an electrical engineering system, a fault is an abnormal electric current flowing through the system, and fault analysis is the study of these faults. For instance, a short-circuit is a fault where the live wire touches the ground or neutral wire. If a circuit is interrupted by a failure of a current-carrying wire then an open circuit fault occurs. The open-circuit faults are also called series faults. One or more phases or ground may be involved in a three-phase fault or may occur only between two phases. Current flows into the earth in case of a ground fault or earth fault. For most situations, the prospective short circuit current of a fault that is predictable can be calculated. To limit the loss of service because of a failure, the protective devices can detect fault conditions and operate circuit breakers and also other devices. All phases equally can be affected in a poly-phase system which is known as symmetric electrical fault. The asymmetric fault becomes more complicated to analyze if only some phases are affected. By using methods such as symmetrical components, the power system analysis of these types of faults is often simplified. The main objective of power system protection is to design, detect, and interrupt power system faults.