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…

Q: a. prove that the circulating current value decrease with the increase in the load between the tv…

A: Two or more transformers can be linked in parallel with an existing transformer to deliver a load…

Q: Please enter your answer in the blank's: Voltage at load bus, VLoad = ° p.u. Motor apparent power,…

A: One line diagram of a three phase system  From circuit

Q: (a) A single phase, unity power factor load takes 70 A at 25 kV. Using a base voltage of 60 kV and…

A: Per unit

Q: Can three single-phase transformers be connected in Y-Y with substractive polarity, in such a way…

A: Three single-phase transformers are connected in Y-Y with subtractive polarity, such that line to…

Q: The of transformers are neglected to draw the reactance diagram. O Shunt branches O Series…

A: 1.The reactance diagram is derived from the impedance diagram only. 2. The equivalent circuit gives…

Q: Four identical alternators rated 25 MVA each has a per unit  reactance of 0.50. These alternators…

A: The solution is given below

Q: For a single phase network shown in the figure below, work in per-unit with 200 VA & 250 V as base…

A: In this question we need to find a load current of the given system.

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

A: The objective of the question is to calculate the secondary line voltage, the currents in the…

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

A: Given, The single line diagram is shown below, Where,Feeder impedance, ZF=0.003+j0.015 Ω/phaseLine…

Q: AC Power and Power Factor 1. Two loads are connected in parallel across a 13,200-volt line. Load A…

A:

Q: Three single-phase two-winding transformers,

A:

Q: Two 3-phase, 6.6 kV, star-connected alternators supply a load of 3000 kW at .f. lagging. The…

A:

Q: b. Two 1-ph transformers 6000/400V, the first 200kVA and the other is 350kVA when performing the…

A: Given  Parameters of single phase transformers.we need find the load shared by the two transformers.…

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

A: Three single-phase step up transformers rated at S1−ϕ=50 MVA, 13.2 kV/80 kV are connected in…

Q: Q.3 Power Systems - Basics of Power Syst... A power system is represented by a single line diagram…

A: Power system- Generating rating = 40 MVA, 25 KV, XG=0.2 p.u. Transformer T1 rating=33/220 KV

Q: Single phasing happens when one phase of a three phase source becomes unavailable.  True  False

A: Given  A true or false question based on single phasing condition. Please find the answer below.

Q: There is an installation with two equal triphasic loads of 300 kVA each and a power factor of 0.9…

A: The installation has a total apparent power of 600 kVA with a power factor of 0.9 lagging. The total…

Q: a transmission line has an impedance of 4 12 Ohms/phase, Find the per-unit impedance of this line on…

A:

Q: G₁: T₁: T₂: G₂: Line: Load: G₁ 90 MVA 80 MVA 80 MVA 90 MVA 20 kV 20/200 kV 200/20 kV 18 KV 200 kV…

A:

Q: A new industrial development has decided to'use two 350 kVA single-phase transformers to serve as an…

A: The explanation is as follows.

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

A:

Q: In a -ve sequence 3-phase supply,___________________ a. Y lags B by 120 degree b. both R  and Y in…

A: Given the -ve sequence of the 3-phase supply

Q: The two transformers in Scott connection supply two single phase loads at 100V. The leading load…

A:

Q: 4- For the transformers operating in parallel prove the following: a- The circulating current…

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

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

A: Given, Base MVA rating, Sbase=15 MVA Fault or short circuit MVA rating, Ssc=400 MVA Per unit…

Q: in a tie-bus arrangement as shown in figure. the reactances of the generators and reactors are 0.2…

A: We redraw the circuit on per phase per unit basis: In the circuit the fault point is connected to…

Q: Parallel Operation of Alternator. Two 3-phase 6.6 kV, star-connected alternators supply a load of…

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Q: What can you say about the flow of power as a function of time between a balanced three-phase source…

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Q: 2.21 The three-phase source line-to-neutral voltages are given by E= 10/0, E = 10/+240, and E =…

A:

Q: Power in a three phase delta system

A:

Q: Three single-phase distribution transformers, each rated for 18 kVA, 20000/220 volts, are connected…

A: Three single-phase distribution transformers are connected in a Dy three-phase bank. Rated power…

Q: System Model and Per Unit T1 Line T2 BE ji0/km BE 31.25miles 3C Impedance Load R1.jXi.-0.1+j0.5 p.u.…

A: The single line diagram is shown below: (a) The value of the base MVA and Base KV will be 30 and 13…

Q: L-type equivalent circuit and parameters for a continuous sinusoidal phase of a 5.5 kW, 1420 rpm,…

A: The slip of the three-phase ASM is calculated as shown below:  Ns=120fPP=4f=50…

Q: Differentiate Wye and Delta Connection in Three Phase System and Relate it with Computer Engineering

A: The differences between the wye and delta connection is listed in the table shown below:    Delta…

Q: In the three phase system, phase is on no load, phase b and c are shorted circuited to ground. The…

A:

Q: Two single phase transformers A and B with equal turns ratio have reactance of j3.2 and j19.2…

A:

Q: A workshop from a 231/400 V transformer center with a 3-phase and four-conductor underground cable…

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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.