The rating of generator is expressed in terms of kVA      Select one: True False

Q: What is the per unit impedance of a 50 MVA, 13.8 kV, 1% impedance transformer if the base is change…

A:

Q: Determine the short-circuit current ISC3,0.4kV for a 3-phase short- circuit fault at F. Give your…

A: For calculation of the short circuit current is made easier by dividing the transmission line into…

Q: The reactance of a generator is given as 0.4 per unit based on the generator's nameplate rating of…

A: As per the guidelines I have to do a maximum of 1 question so I request you to submit the remaining…

Q: Two single-phase 11,000/400 V transformers have kVA ratings of 200 kVA and 100 kVA respectively. The…

A:

Q: A 30 MVA 11 kV generator has a reactance of 0.10p.u.on its own base. Determine the per-unit…

A: Given: For the generator Sbold=30 MVAVbold=11 kVXpuold=0.1 puSbnew=50000 KVA=50 MVAVbnew=33 kV

Q: Two 70 kW single-phase transformers are connected in parallel. The impedances of the first and…

A:

Q: A-Give the answer of the following: 1. what functions are performed by instrument transformers. 2.…

A: (1) Consider the function performed by the instrument transformer as follows:

Q: 7.05 Three 30:1 step down transformers are connected wye-delta for stepping down th 132,000-volt…

A: Given, KVA rating = 5000 KVAtransformer ratio = 30:1  (step down Xer)V1L = 132 KVV2L =?KVA =? VP1…

Q: Generator Load I Load 2

A:

Q: Transformer-1 is in parallel with Transformer-2. T-1 T-2 150 kVA, 1Ø 300 kVA, 1Ø 6600/240 V 6600/240…

A: Transformer 1 : ST1 =150 kVA Z1 =0.02425∠62.9 Transformer 2 : ST2 =300 kVA Z2 =0.01067∠62.9   We…

Q: 9. Two alternators each having 4% speed regulation are working in parallel. Alternator 1 is rated 12…

A: Given that two alternators are in parallel. Speed regulation of alternator is 0.04. R in pu=0.04 For…

Q: SHOW COMPLETE SOLUTION! ASAP!! two single-phase transformers are connected open-delta and deliver a…

A: Transformer: It is a static device and is used to step up and step down the voltage level while…

Q: Load duration curve Hours 0 500 2000 4500 6000 8760 Mw 50 Load 50 35 30 20 |15 there are two (2) -40…

A: Rating of each generator = 40 MW Energy = power X time Plant load factor = Actual energy generated…

Q: Power losses in a transmission line can be decreased by stepping up the voltage using transformer.…

A: We need to tell about whether given statement is true or false.

Q: Why transformers are rated in kVA

A: Why transformers are rated in KVA ?

Q: Q1 (а) In Figure Q1(a), four identical 10 MVA, 11 kV, 50 Hz three-phase generators, A, B, C and D,…

A:

Q: Refer to Figure 8-31 to answer the following questions.   Assume that a line voltage of 12,470volts…

A: Analyze the given circuit, we will observe that: The primary winding of the Transformer is Delta…

Q: Connect three single-phase transformers in Y-Y, with subtractive polarity, so that the line-to-line…

A: Given: Connect three single-phase transformers in Y-Y, with subtractive polarity, so that the…

Q: 5.10 The zero sequence current of a generator for line to ground fault is /2.4 p.u. Then the current…

A: we need to determine current through through neutral.

Q: Question 6 What is phase angle of voltage induced in primary and secondary windings of transformers…

A: Given  Phase voltage of primary and secondary due to mutual flux is

Q: Which statement is wrong ? High load factor of a generating equipment Ogives more profit to owner…

A: LOAD FACTOR :-                           The Load Factor is defined as a ratio of the average load…

Q: Two transformers are to be operated in parallel such that they share load in proportion to their KVA…

A: Given: Two transformers are to be operated in parallel with share load to their kVA ratings. Rating…

Q: Equal area criterion is used for ______________ analysis of power system. a. Transient stability…

A:

Q: Instrument transformers can measure and of transmission lines. а. Frequency , current b. Voltage,…

A: Instrument transformer are known as current transformer and potential transformer

Q: Two 70 kW single-phase transformers are connected in parallel. The impedances of the first and…

A: The Given Two 70kW 1ϕ Transformer are connected in parallel. The 1st and 2nd transformer are 0.6+j6Ω…

Q: Calculate the availability if a generator unit whose failure rate is given as 0.0011failures per…

A: In this question we need to find a availability of a genrator for the given condition.

Q: The zero sequence current of a generator for line to ground fault is j2.4 p.u. Then the current…

A: Given data, Zero sequence current is given Iao=j2.4 pu

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

A:

Q: 1. (a) Which parameter is the most important in case of determining the rating of a circuit breaker…

A: (a)  In a power system, the rating of a circuit breaker is usually defined by its capacity to handle…

Q: 36 slot 4 pole 3 phase alternator winding pg7 slot electrical angle by which the winding is quality…

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

Q: The reactance of a generator is given as 0.2 per unit based on the generator's nameplate rating of…

A:

Q: Q-1 Why Transformers rating in KVA. And not in KW?

A: As per the guidelines, we supposed to answer one question at a time so please ask other questions…

Q: Two single-phase transformers, one of 100 kVA and the other of 50 KVA are connected in parallel to…

A: Given data, Rating of transformer S1=100 KVA, S2=50 KVA Resistances are given 2% and 5% Reactance's…

Q: For transformers ratings are always given in kVA, not in kW because         1-It is conventional…

A: Since the power factor of load is not known, transformer ratings are always given in KVA and they…

Q: In Ring main system, the primaries of distribution transformers form a loop. The loop circuit starts…

A: We need to tell about the given statement is true or false.

Q: A 39.6 kV, 6 MVA star connected alternator has a reactance of 1.5 ohm per phase and negligible…

A: % of winding unprotected is given by           =I'RV×100where,I' = Operational current limit…

Q: 1) The condition for parallel operation of two 1-Ø transformers is that they should have the same A)…

A: Conditions for parallel operation of transformer: 1. The polarities of the transformers must be the…

Q: For the same alternator the ratio of rated kva, when connected as a three phase winding alternator…

A: Solution: When connected to single-phase winding, Let the number of turn/Phase=N Phase Spread…

Q: The plant capacity of a 3Ø generating station consists of two 10,000 KVA alternators of reactance…

A:

Q: what are the advantages and Disadvantages Connecting transformers 3 Phase between (delta to Star)

A: Star to delta connection. In this connection, the start connection is at the primary side and the…

Q: What is Per Unit System? In the given picture, would there be any difference in calculation of the…

A: Per Unit System Per unit, the system is a simple approach to solve large generation, transmission,…

Q: I. 1. Please research on the following items: Instrument Transformers A. Current Transformers ➤…

A: Given data, A) Current transformers:- Its operation, its types, and its applications. B) Voltage…

Q: X₂=0.1 1 XL +03 Soto X₁ = 0.2 X = 0.1 X = 0.1 Above is the one-line diagram of a simple power…

A: For the given one-line diagram of a simple power system. Each generator is represented by an emf…

Q: The reactance of a generator is given as 0.4 per unit based on the generator's nameplate rating of…

A: Reactance of the Generator = 0.4 at  100kV and 200MVA  Find the at base of 50kV and 100MVA

Q: 36. The essential condition for parallel opearation of two 1- transformers is that they should have…

A: In this question,  We need to choose the correct options What is the essential condition for the…

Q: What would be the total single phase 120kVA capacity that could be used with the transformers size…

A: Given:Rating of the single phase transformer = 1.5 kVATransformer is connected with a 120 kVA load.

Q: Consider a 3-phase, 35 kV transformers with N1:N2 = 150:900. Calculate the secondary line voltage on…

A:

Q: A generator is rated 100 MVA, 22 kV. Its Y connected windings have a reactance of 1.1 per unit. Find…

A: Per unit value is the ratio of actual value to the base value. Given:

Q: 2) A single phase transformer is rated 110/440 V, 2.5 KVA. The impedance measured from the low…

A: Given data : Rating of transformer 110/440V 2.5KVA Impedance measured at low voltage side,…

Q: 3.5 kva 220/110 volts single phase transformer has measured impedance referred to the high side of…

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.