Disadvantages Zero-sequence overcurrent elements 1. provide outstanding resistive fault coverage 2. are easy to set, understand, and visuakze 3. are not affected by load flow because the load current has very litle impact on the zero-sequence current magnitude 4. are not affected by phase-to-phase connected load (ie, delta-wye transformers) OTrue O False QUESTION 2 Advantages Negative-sequence overcurrent elements: 1. provide outstanding resistive fault coverage 2 provide better resistive fault ooverage than zero-sequence overcurrent elements for faults at the end of long ines are insensitive to zero-sequence mutual coupling associated with parallel transmission ine applications O True O False QUESTION 3 If the X1 terminal sits diagonally across from the H1 terminal, the transformer has additive polarity O True O False

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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.