16. Three single phase step up transformers rated at 40 MVA, 13.2 kV/80 kV are connected in delta-wye on a 13.2 kV transmission line. If they feed a 90 MVA load, the secondary line voltage is a. 80 kv b. 13.2 kV ww C. 139 kV d. 22.83 kV

Q: 3. The single-line diagram of a three-phase power system is as shown in Figure Al-3. Impedances are…

A: According to the question we have to find the value of voltage across buses 2 and 1 with the help of…

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Q: A three-phase, 230 V, 72 kVA, 0.9 pf (lagging) load is supplied by three 29 kVA, 1330/230 V, 60 Hz…

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Q: Three single-phase two-winding transformers,

A:

Q: Three single-phase step-up transformers rated at 50 MVA, 13.2 kV/80 kV are connected in delta-wye on…

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Q: Example 60 MVA, 13.8 kV a balance three phase load with 0.8 lagging power factor. Determine for the…

A:

Q: At a certain location in an electric system, the available fault MVA is 400. A 15 MVA, 34.5 kV/6.24…

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A:

Q: In a three-phase system the per-unit phase voltages are Van = 0.9220° , Vin 0.9Z – 100° , Von…

A:

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.