A 100 MVA, 33 kV,3 phase synchronous generator was subjected to different type of faults. The fault current are as follows LG fault=4500 A LL fault = 2800 A 3 phase fault = 2100 A The generator neutral is solidly grounded. The value of the zero sequence reactance of the generator is

Q: In the following 3-phase power system, the voltage at point a is initially 0.95 pu, and the motor is…

A: In this question we need to find a fault current of the given system when a ground fault occurs at…

Q: A fault occurs at bus 4 of the network shown in Figure Q3. Pre-fault nodal voltages throughout the…

A: x=1y=7Note: reactance of element right to bus 4 is not given. Hence we will not consider that in…

Q: An 22 kV, 200 MVA alternator is grounded through a resistor of 5 Ω. The CT's have a ratio 2000/ 10.…

A:

Q: A 25 MVA, II kV generator has X"d=0.2 p.u. X2 = 0.3p.u. and X0=0.1 p.u. Tht neutral of generator is…

A:

Q: b) A fault occurs at bus 2 of the network shown in Figure Q3. Pre-fault nodal voltages throughout…

A:

Q: A 3 phase fault occurs at bus 1. Fault impedance Z, =j0.2 p.u. Z,, = 0.07286 p.u. Then the fault…

A: In this answer we will try to find out the fault current at bus-1 as shown below. Fault current is…

Q: ence components of the fault current are as Ipositive 12 p.u., Inegative and Izero The type of fault…

A: SOLVE ABOVE QUES

Q: Q.3 When a line-to-ground fault occurs, the current in faulted phase 'a' is 100A. The zero-sequence…

A:

Q: A 50 MVA, 11 KV three-phase alternator was subjected to a different types of faults. The fault…

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.