The reactance of a generator is given as 0.25 per-unit based on the generator’s of 18 kV, 500 MVA.  Find its per-unit reactance on a base of 20 kV, 100 MVA. a. 0.0505 b. 0.0605 c. 0.0405 d. 0.0606

Q: a) An alternating current varying sinusoidally with a frequency of 50HZ has an RMS value of 20A.…

A: Consider the sinusoidal wave to be a sine wave. The frequncy of theAC current is 50 Hz.Therefore,…

Q: In transformers, the flux lost in the air is called nd as SKW. If th

A: There are two types of flux in trabsformer, namely, Linkage flux Leakage flux

Q: Two transformersA and B are connected in parallel to a load of (2+j1.5) ohm.Their impodancon in…

A: It is given that: ZL=2+j1.5 ΩZA=0.15+j0.8ZB=0.1+j30.6EA=200 VEB=210 V

Q: Suppose for designing a diesel engine power plant you have brought a diesel engine & an 8 pole…

A: No of poles, P= 8

Q: The average power to the plant shown in the figure is 2474 kW and the power factor is 0.707 lagging.…

A:

Q: a load of 15 mva with power factor 0.86 lagging is given. Calculate the reactive power delivered by…

A: Given, A load of 15 MVA with power factor 0.86 lagging S=15 MVAso, P= 15×0.86=12.9 MW And, power…

Q: The total power drawn by the two-impedance load in parallel is 26kW at 0.98 power factor lagging, it…

A:

Q: For a power station the yearly load duration curve is a straight line from 50,000 to 4000 kw. To…

A: Capacity of Generator 1 & 2 = 20,000 kW Capacity of Generator 3 = 7000 kW Pmax = 50000 kW Pmin =…

Q: A generator supplying a load is shown in the figure. A second load is to be connected in parallel…

A: Given   fo=61 Hz    load 1:1000 kN at 08pF laggingSp=1 mw/Hz    load 2: 800kN at 0.707 PF…

Q: A synchronous generator may be represented by a voltage source of magnitude 1.7 p.u. in series with…

A: Electrical machines can be either generator or motors. They can be either Ac machines or DC…

Q: The rms value of a three-phase balanced ac voltage source is 173V. Such voltage source is used to…

A: Given        RMS value of three phase balanced ac voltage =173V   Assuming line to line voltage⇒…

Q: 17 The voltage a cross a load impedance is V = 12270° V and the current through it is I = 32-20° A…

A:

Q: The type generator field winding is supplied from the external D.C. source. O Shunt O Self excited o…

A: Seld excited generator does not require addtional power DC supply.

Q: In the system shown in Figure 1, the transformers are connected star-star with both star points…

A: It is given that: MVAbase=15XT1=XT2=XT3=0.04 pu

Q: An alternator with intemal vallage of 128, p.u. and synchronous reactance of 0.4 p.u. is connected…

A: It is given that:

Q: A 3-phase, 16 pole alternator has a star connected winding with 144 slot and 10 conductor per slot.…

A: This question belongs to electrical machine . It is based on the concept synchronous generator .…

Q: A synchronous generator has been synchronized to an infinite grid of 13.8 kV and 60 Hz. The…

A:

Q: 4.26 A single-phase load is supplied through a 34.5-kV feeder and a 34.5/2.4-kV transformer. The…

A: To solve this question We draw a equivalent circuit diagram of the given power system .

Q: Obtain the per-unit equivalent circuit for the following one-line diagram in Figure 1. Xine = 100 Q…

A:

Q: A generator at no-load operates 61 Hz, slope 1MW/Hz. Load 1= 1.0 MW and load 2=0.8MW are  connected.…

A: In this question we need to choose a correct option

Q: What are harmonic producing loads and how these loads affect the power quality

A: Harmonics are explained as the characteristics of a voltage or current waveform with relation to its…

Q: A 100 kVA, 500 V/200 V, 1-o transformer when excited at rated voltage on h.v. side, draws a no- load…

A: Given- 1-phase transformer- 100 kVA, 500 V/200 V, no load current = 3 A, Lagging power factor…

Q: Find the rms value of the induced emf per phase of a 10 pole, three phase, 50 Hz alternator with 2…

A:

Q: Describe the concept of three-phase power in electrical systems and its advantages over single-phase…

A: In this question, we need to describe the concept of three phase power in electrical system and also…

Q: Draw rough sketches showing the following: a. A current which lags the voltage by 60°. b. A current…

A: Phasors rotates in anti clockwise. Current lags the voltage means current comes after voltage.

Q: A three phase 500 MVA, 22 kV generator has winding reactance of 1.065 Ω. Find its per-unit…

A: Given,For a generator,MVA = 500kV=22Winding reactance = 1.065Ω

Q: Define the parts and functions of AC Generator -  Define the working principle of AC Generator. -…

A: AC Generator A machine that converts mechanical energy to electrical energy is called AC generator.…

Q: A synchronous generator generates 370 V at 55 Hz when the field current is 4.4A. The e.m.f generated…

A: Generated emf of the synchronous generator is proportional to is frequency and current.

Q: An alternating current varying sinusoidally with a frequency of 50 Hz has an rms value of 40 A.…

A: This is a simple question based on network analysis and simple electrical engineering. The topic is…

Q: The per unit impedance of a generator on a 60 MVA, 20 kV base is j0.09 p.u. The per unit impedance…

A: Given, Zpuold=j0.09 puMVAold=60 MVAMVAnew=100 MVAkVold=20 kVkVnew=20 kV

Q: two generators supplying a load. Generator I has a no-load frequency of 62.5 Hz and a slope Sp1 of I…

A: Part (a): Suppose the system frequency be ffl.  Generator 1 has a no-load frequency of 62.5 Hz. The…

Q: Given 1 and l2 represent the primary and secondary currents through a mutually magnetically coupled…

A:

Q: A generator is supplying a load. An incremental change in load of 4 MW requires generation to be…

A:

Q: A generating station has a maximum capacity of 100 kW and costs $300,000. The annual fixed charges…

A: This question belongs to electrical power system. It is about units generated for different load…

Q: A synchronous generator is generating 300 V at 55 Hz at a field current of 3.4A. The e.m.f generated…

A: In this answer let us try to understand the relation between the emf generated in the synchronous…

Q: A synchronous generator generates 365 V at 60 Hz when the field current is 3.9A. The e.m.f generated…

A: A synchronous generator generates 365 V at 60 Hz At he field current is 3.9A. The e.m.f generated…

Q: A three – phase 11 kV wye connected synchronous alternator has a synchronous reactance of 8 ohms per…

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.