Question

A submarine has a 3-phase, Y-connected, 2- pole, 60Hz synchronous generator rated to deliver 1687.5 kVA...

A submarine has a 3-phase, Y-connected, 2- pole, 60Hz synchronous generator rated to deliver 1687.5 kVA at a FP = 0.8 lagging with a line voltage of 450-V. The machine stator resistance RS = 0.004 ?. The synchronous reactance is Xs=0.08 ?. The actual system load on the machine draws 900 kW at FP = 0.6 lagging. Assume that a voltage regulator has automatically adjusted the field current so that the terminal voltage is its rated value. Mechanical losses are 100 kW. Use Van as the voltage reference.

a. Determine the reactive and apparent power delivered by the generator.  

b. Find the current delivered by the generator

c. What is the overall efficiency?

Engineering   Electrical-Engineering   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A three-phase, 9,375 kVA, 13.8 kV, 4-pole, 60 Hz, Y-connected synchronous generator has a synchronous reactance,...
A three-phase, 9,375 kVA, 13.8 kV, 4-pole, 60 Hz, Y-connected synchronous generator has a synchronous reactance, Xs = 17.9, and is connected to an infinite bus at rated voltage. If the rotational and electrical losses are negligivle, what is Ia, Ef, delta, theta, Tdrive, Phasor diagram, and power flow diagram (label completely with numerical values for, A) the machine as a generator; the prime-throttle is opened and If is adjusted so that the machine delivers rated kVA, 0.8 pf lagging,...
A synchronous generator 480-V, 50-Hz, Y-connected, six-pole has a power rating of 50 kVA at pf...
A synchronous generator 480-V, 50-Hz, Y-connected, six-pole has a power rating of 50 kVA at pf 0.8 lagging. The synchronous Reactance Generator is 1.0 Ω per-phase. This Generator is connected to the 45 kW steam turbine. The friction loss and the core generators are respectively 1.5 kW and 1.0 kW. Question : Draw a Capability curves!
A 3-phase, 1.2 MVA, Y-connected, 6.6 KV, 6-poles, 60 HZ, synchronous generator has a synchronous reactance...
A 3-phase, 1.2 MVA, Y-connected, 6.6 KV, 6-poles, 60 HZ, synchronous generator has a synchronous reactance of 30W and negligible resistance. The generator is connected to an infinite bus at 6.6 KV and 60 Hz. a)Determine the excitation voltage (Ea) when the machine is delivering rated power at o.8 PF lagging. b)The field excitation current is increased by 10% without changing the power input from the prime mover. Find the stator current (Ia), the power factor and the reactive power...
A 50-Hz, two-pole, 825 kVA, 2300 V, three-phase synchronous machine has a synchronous reactance of 7.47...
A 50-Hz, two-pole, 825 kVA, 2300 V, three-phase synchronous machine has a synchronous reactance of 7.47 and achieves rated open-circuit terminal voltage at a field current of 147 A. c. For a constant load power of 700 kW, write a MATLAB script to plot the terminal current as a function of field current. For your plot, let the field current vary between a minimum value corresponding to a machine loading of 825 kVA, leading power factor, and a maximum value...
A 3- phase, 2 pole Y-connected synchronous machines has a line-line voltage of 6,000V in 60Hz...
A 3- phase, 2 pole Y-connected synchronous machines has a line-line voltage of 6,000V in 60Hz power line, has an armature reactance of 2ohms/ phase and negligible armature resistance. Compute the following A) In case of generating action if the line current is 385 A at a leading power factor of 0.8, the armature voltage per phase is 3464V, Compute the voltage per phase and power angle. B) Draw the phasor diagram. C) If the losses in the machine is...
3) A three-phase, nozzle, 4-pole cylindrical pole synchronous generator feeds a 400 Volt, 50Hz conversion center....
3) A three-phase, nozzle, 4-pole cylindrical pole synchronous generator feeds a 400 Volt, 50Hz conversion center. The synchronous reactance of the synchronous generator is 0.72 Ove armature resistance is neglected. The relation between the pole voltage E 'induced in the induction of the synchronous generator and the excitation current, is selected as E, = 824. In this working environment of the synchronous generator, a.) On the consumer screen, find the excitation current (U), load values, internal phase values, the moment...
A three-phase wye-connected (Y) synchronous generator is operating at Ea = 8.OLO° kV (lineneutral) and has...
A three-phase wye-connected (Y) synchronous generator is operating at Ea = 8.OLO° kV (lineneutral) and has synchronous reactance of X~ = 1.0 fl . The generator is connected to a threephase delta-wye connected step-down transformer that is constructed from three individual single-phase transformers. Each the single-phase transformers has rated power of 200 kVA has a turns ratio of 4:1 where the rated primary voltage of 8.0 kV and a rated secondary of 2.0 kV and a per-unit series reactance of...
A 1200 kVA, 2.3 kV, 3-phase, star - connected alternator has a resistance of 0.401 /phase...
A 1200 kVA, 2.3 kV, 3-phase, star - connected alternator has a resistance of 0.401 /phase and a synchronous reactance of 3.21 /phase. If the generator is supplying a load at a power factor of 0.8 lagging and at rated KVA, calculate the change in line voltage at the output terminals of the generator if the load is suddenly disconnected. Assume the speed and the excitation current is to remain unchanged.
A 200kVA, 480v, 50Hz, star connected synchronous generator with a rated field current of 5A was...
A 200kVA, 480v, 50Hz, star connected synchronous generator with a rated field current of 5A was tested at rated speed and the following data were taken: 1. The open circuit terminal voltage of the generator was 540v at rated field current. 2. The short circuit line current was 300A at rated current. 3. With the machine at standstill, a dc voltage of 10v was applied between two of the generator terminals, a current of 25A was measured. Determine the values...
A three-phase Wye-connected synchronous generator is rated 3600 rpm, 200kVA, 480V, 60 Hz. The generator’s armature...
A three-phase Wye-connected synchronous generator is rated 3600 rpm, 200kVA, 480V, 60 Hz. The generator’s armature winding resistance is RA = 0.03Ω and the synchronous reactance XS is 0.25Ω. The rotational losses are 6kW, the core losses are 4kW, and the stray losses are 1% of the output real power. The generator is delivering 200kVA power at 0.85 pf lagging at rated voltage. Taking the phase voltage at the output as a reference, answer the following questions. How many poles...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT