The neutral of the three phase 20 MVA, 11kV alternator is earthed through a resistance of 5 ohms, the relay is set to operate when there is an out of balance current of 1.5 A. The CTs have a ratio of 100/5. What percentage of the winding is protected against earth faults?

Q: Question 10 Not yet answered Marked out of The results from the DC test of a single phase…

A: Given the result from dc test of single phase transformer, DC Volatge, Vdc=14 V.DC Current, Idc=1.5…

Q: 2 A 1000 kVA 11 kV/400 V ONAF cooled transformer works on a cycle of 3 hours heavy load and 21 hours…

A: Given that the peak load is 140% and can only be maintained for 0.5 hours per hour of time constant,…

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: In DC generator pole core is made up of

A: In the DC generator pole core is made up?

Q: I need the answer quickly

A: Step 1   Solving for given transformer A, aA=6600440aA=15 Given low voltage side is short circuited,…

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A: The advantage and disadvantage is given below of the following : Generator reactor: Disadvantage:…

Q: B- what are the disadvantages of the auto lran

A: Note: We are authorized to answer the first question since the exact one wasn’t specified. Please…

Q: - Inter pole winding is connected in

A: Inter pole produces a counter emf to nullify reactance voltage.

Q: A three-phase uncontrolled bridge rectifier delivers power to a resistive load of 102. The output…

A:

Q: A core type transformer operates on 405/ 235 volt, 50 Hz supply. If the cross-sectional area of the…

A:

Q: What are rotor faults in alternators

A: The rotor of an alternator is directly connected with field winding of the alternator whenever there…

Q: Why transformers are rated in kVA

A: Why transformers are rated in KVA ?

Q: The following values ​​were seen in the measurements made separately by the primary and secondary of…

A: The Equivalent circuit of Transformer referred to secondary side is shown below. K=Transformation…

Q: 4- With the increase of the winding of a d.c. generator, terminal voltage wil c) Remain same a)…

A: (4)  With the increase of winding of a dc generator, the armeture resistance of winding also…

Q: If it is desired to bring alternating current out of a generator, what kind of a "take-off" system…

A: If the alternating current is required from the generator a copper or brass rings are connected at…

Q: A 100kW generator, 250V, 6 poles have a wave wound armature with 300 turns then the number of…

A: The solution can be achieved as follows.

Q: 3. When an alternator connected to a particular load the calculated voltage regulation is -10.6%.…

A:

Q: True or False Due to their shape, full-pole generators are more affected by wind and centrifugal…

A: Due to their shape, full-pole generators are more affected by wind and centrifugal forces than other…

Q: A single phase transformer is rat 2,424 V / 206 V. 60 Hz The eau

A:

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

A: Choose the correct option Which of the following is the rotor fault of alternator?

Q: 1- When 400 volts, 60HZ is applied to the transformer primary winding maximum flux in the core is---

A: We know that Emf Equation: E=4.44NBAf=4.44 Nfϕ E=v= voltage or emf N= no. of turns B=magnetic flux…

Q: Before closing the synchronism switch to connect two alternators in parallel, it is observed in a…

A: Given: A set of 3 lamps

Q: The winding data for three different alternators are as follows 1. 60 slots, four poles, span 1 to 9…

A: We will find the pitch factor in each case as shown below.

Q: In a 2 pole wave wound DC Machine has 620 conductors, the number of parallel paths is

A:

Q: 1. Why the iron losses are constant & copper losses are variable in the transformer?

A: TRANSFORMER: The transformer transfers power from one circuit to another circuit without a change…

Q: B- what are the disadvantages of the auto transformers? C-An auto transformer is used to step-down…

A: Since you have posted a question with multiple sub-parts, we will solve the first three sub-parts…

Q: A core type transformer operates on 400 / 225 volt, 55 Hz supply. If the cross-sectional area of the…

A:

Q: Transferred surge current method is used to find a. Fault in the transformer insulation b. Fault in…

A: Given  Transferred surge current method

Q: If a transformer is to be taken out for maintenance, as an engineer, outline the switching sequence…

A: Switching sequence – To turn on or off a bus bar, equipment, power plant requires expertise and…

Q: Adjustment resistance in rotor system will --------when three phase load .decrease Increase O not…

A: Adjustment resistance is also known as external resistance. Purpose of adding external resiistance…

Q: If the transformer has a turns ratio of 9.45:1, what is the phase voltage of the secondary?

A: In this question we need to find a phase voltage of secondary .

Q: core type transformer operates on 410 / 225 volt, 50 Hz supply. If the cross-sectional area of the…

A: For Transformer EMF = 4.44×frequency×Flux density×Area of core× No. of turns. Given primary voltage…

Q: 250 turns on the primary and 40 turns on the secondary winding. The primary is connected to 1500 V,…

A: We need to find secondary side emf and flux for given transformer.

Q: What way the two electrical circuits are linked in transformer to change the values of alternating…

A:

Q: choose in the given losses changes with the load in the transformer? Option 1: None of these Option…

A: Consider that the losses in the transformer are the core loss and the copper loss.

Q: What kind of protection scheme can be used in the stator winding of an Alternator for inter turn…

A: Lightening surge is very high Voltage. SF6 used to protect high voltage. For interrupt the…

Q: Q10) For the transformer shown in Figure below, determine (i) The turns ratio of the transformer…

A: A transformer has two windings - the primary and the secondary. The ratio of the number of turns in…

Q: The volts/turn of a 50Hz, 13800/460 V transformer is 6.68 Calculate the number of Primary and…

A: Given,Volts/turn limit =6.68Frequency = 50 HzVoltage across primary turns, Epri=13800 VVoltage…

Q: Refer to Figure I on Worksheet I, to answer numbers 18 through 27 based on the fact that it is a…

A: R equivalent on the secondary side of the transformer, Req=10+2401202×15      =10+60       = 70 ohm…