ings of a 40 kVA, 6 m respectively. The le- ate (i) the primary vol ced (ii) the full-load re

Q: A 75 MVA, 10 kV synchronous generator has X, = 0.4 pu. The X, value (in pu) to a base of 100 MVA, 11…

A: In this question, choose the  correct option A 75MVA, 10kV synchronous generator,  Xd = 0.4PU  The…

Q: 1, Please write down the rated voltage of the generator and the transformation ratio of each…

A:

Q: A generator is delivering power to infinite bus during post fault condition is 1.10 p.u at a power…

A: The solution can be achieved as follows.

Q: Q31. If the no load voltage of a certain generator is 210 V and the rated voltage is 200 V, then the…

A:

Q: What's the maximum primary overcurrent device rating for a 0.50 kVA (500 VA), single-phase, 240V…

A: single phase transformer: S=VpIp500=240IpIp≅2.08 Ampere

Q: Which of the following is not a boundary condition for an SLG fault on phase 'a' of a power system?…

A: Since the single line to ground fault occurs on the phase a of the system the fault current of phase…

Q: a 20kw compound generator works on full load with a terminal voltage of 230v.the armature,seriesand…

A: To calculate the generated emf when the generator  is connected short shunt

Q: 4.1Two synchronous generators need to be connected in parallel to supply a load of 10 MW.  The first…

A: The solution is given below

Q: A single phase 240V, 2.5Hp induction motor draws 12A and consumes 2.4KW. Determine motor power…

A: True power =2.5 Hp                    =2.5×746=1865 Watt Apparent power = 2400 Watt Calculate power…

Q: A power system consists of 4 synchronous generators of 200 MVA, 10 kV in parallel, each with a power…

A: A power system consist of 4 synchronous generators.V=10kV (parallel)P=200MVAF=60HzFrom empty to full…

Q: Which of the following is rotor fault of alternator? O Phase to earth O Over current O Inter turn O…

A: The rotor of the alternator which is wound by the field winding. Any single to earth fault which is…

Q: EMF/turn is constant for both primary and secondary windings. Select one: O True O False

A: Choose the correct option Emf/turn is constant for both primary and secondary winding.  Is it true…

Q: To have two alternators in parallel,

A:

Q: An altermating voltage is given by V=150 sin(400t +0.55) volts. Find (a) Peak to Peak value, (b)…

A: As per guidelines, answer to the first three sub parts can be given, please re post the complete…

Q: When a generator fails, its power output is lost, and the result is an imbalance between total load…

A:

Q: Q31. If the no load voltage of a certain generator is 210 and the rated voltage is 200 V, then the…

A: Given data, No load voltage Vnl=210 V Rated voltage Vfl=200 V

Q: The reactance of a generator is given as 0.25 pu based on the generator of 13 KV, 200 MVA. Determine…

A: Given, Reactance, Xg(old)= 0.25 pu Voltage, kV(old)= 13 kV Apparent power, MVA (old)= 200 MVA Base…

Q: Alternator A (100 kVA, 3-f, 240 V, 60 Hz, 1800 rpm) is operating in parallel with alternator B (125…

A: In this question We need to determine the pf of load. If Alternator A (100 kVA, 3-f, 240 V, 60 Hz,…

Q: what would be the minimum size feeder conductor THHW 75 degrees for four 30- amp motor generator arc…

A: To find minimum size feeder conductor THHW 75 degrees motor generator arc welders = 4 numbers  , 30…

Q: An asynchronous generator can normally be started (a) Off-line (must be disconnected from the grid)…

A: Induction generator Induction machine when used as generator then its is called as a induction…

Q: A. 2.4 C. 4.28 D. 4.57 2. A 3-phase 4-pole alternator has a single layer full-pitch winding with 8…

A:

Q: A 51 kVA load operates at 0.72 lagging power factor when connected to a 230 V, 60Hz AC source. The…

A: Steps to analyze the power factor improvement  Find the actual Active and reactive power at given…

Q: Which among these is the advantage of synchronous condensers? O The maintenance cost is low. O The…

A:

Q: Two generators operated in parallel in a generating station, as generator A has 20 KVA, 20KV, 5% ,…

A:

Q: Three phase alternators are invariably connected in star so as to  a. Reduce the size of stator…

A:

Q: Question 4 A star connected neutral grounded 3-phase synchronous generator consists of 0.1 p.u of…

A: In this question we need to find a zero sequence reactance of genrator

Q: 3- Calculate the percentage of winding protected for a three phase/ 20 kV alternator against zere…

A: Given :   CTratio=9005=180 Line voltage is given VL=20 KV Phase voltage is given by…

Q: A single phase alternator has a rated output of 500 KVA at a terminal voltage of 3300 V. The stator…

A:

Q: The reactance of a generator is given as 0.55 pu based on the generator of 21 KV, 350 MVA. Determine…

A:

Q: A star connected Alternator excitation voltage and terminal voltages per phase respectively are 180V…

A: Alternator: It is used to convert the mechanical energy to electrical power in the form of…

Q: The neutral of the three phase 20 MVA, 11kV alternator is earthed through a resistance of 5 ohms,…

A: Given: The neutral of the three phase 20 MVA, 11kV alternator is earthed through a resistance of 5…

Q: Alternator A (10OkVa, 3 phase, 240V, 60HZ, 1800rpm) is operating in parallel with alternator B…

A: For Alternator A,100kVa, 3-ϕ, 240V, 60Hz, 1800rpmFor Alternator B,125kVa, 3-ϕ, 240V, 60Hz, 1800rpm

Q: riving torque is increased by 25%. Draw the correspon

A:

Q: The winding data for three different alternators are as follows I. 60 slots, four poles, span 1 to…

A: Pitch factor can be calculated using the formula below cos aplha / 2

Q: A 40 kVA, single-phase transformer has 400 turns on the primary and 100 turns on the secondary. The…

A:

Q: Two 800kW alternators A and B operating in parallel. The speed regulation of A is 100% to 103% from…

A: Solve the problem

Q: Fae number of parallel paths and the number of series conductrs required for a given kW reting are…

A: Number of parallel path and number of series conductor are required to?

Q: A three phase power system has a fault level of 500 MVA and Sg = 100 MVA at a 132 kV busbar. What is…

A: Given, A three phase power system has SB=100 MVAVB=132 kV Fault level is 500 MVA.

Q: A 50 cycle, 11 kV, 3 phase alternator with earthed neutral has a reactance of 5 ohms per phase and…

A: It is given that: f=50 cyclesV=11kVXL=5ohmC=0.01μF

Q: A 3.3 kV/110 V, 50 Hz, single-phase trans- former is to have an approximate e.m.f. per turn of 22 V…

A: The emf per turn of the transformer is 22 V,  E1N1=E2N2=22 (a) From the rating of the transformer,…

Q: The following information is given in connection with an alternator slot = 144; poles = 8; speed =…

A: Whole Coiled:- When we distribute the all coils over the whole armature periphery, then the armature…

Q: imary winding is connected o be applied at normal freq rough it when the secondary conner loss

A:

Q: The reactance of a generator is given as 0.1 pu based on the generator of 17 KV, 300 MVA. Determine…

A: In this question per unit impedance given on some Mva and kv..We have to find new ou impedance on…

Q: The following information is given in connection with an alternator slot = 144; poles = 8; speed=…

A:

Q: A 3-phase 33 kV, 37.5 MVA alternator is connected to a earth fault on one phase at the remote end.…

A:

Q: Quèstion 6 Which of the following is not a boundary condition for an SLG fault on phase 'a' of a…

A: For single line to ground fault on phase 'a'  all the fault current flows through phase a. And no…

Q: Exercise 1: 4/iv If a 4-pole d.c. generator supplies a total current of 50A, what will be the…

A: As per guidelines we are supposed to solve only one question (i.e first question) . So I request you…

Q: 7. An inductive load is shared by two identical synchronous generators A and B equally, if the…

A: When two Identical alternators A and B are sharing an inductive load equally. And if the excitation…

Q: The reactance of a generator is given as 0.7 pu based on the generator of 15 KV, 200 MVA. Determine…

A: In this question , generator pu reactance 0.7 pu  is given on 200MVA and 15 KV .. we have to find…

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.