Question

A 10-kVA, 250 / 100-V, 50-Hz single-phase transformer gave the following open and short circuit test...

A 10-kVA, 250 / 100-V, 50-Hz single-phase transformer gave the following open and short circuit test results:
Open circuit test: 250 V, 2.6 A, power factor: 0.3 on HV side.
Short circuit test: 18 V, 80 A, input power: 240 W on HV side.
Calculate the following:
4.1 The equivalent circuit parameters of the transformer. (6)
4.2 The efficiency at full load unity power factor. (NB the test current is not at full load) (6)
4.3 The load at which maximum efficiency occurs (4)
4.4 The maximum efficiency at unity power factor (2)
4.5 The voltage regulation for a lagging power factor of 0.8

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
Determine the transformer equivalent circuit components referred to the LV side and sketch the equivalent circuit....
Determine the transformer equivalent circuit components referred to the LV side and sketch the equivalent circuit. Calculate the transformer voltage regulation at full load with load power factor of 0.9 lagging. Below is the test result which can be used to determine the value of the components for the equivalent circuit. Power of the transformer = 1 kVA Open circuit test: LV winding Voltage = 110 V LV side ammeter = 690 mA LV side wattmeter = 18 W HV...
A 525 V to 110 V, 50 Hz, single phase transformer has a no-load current on...
A 525 V to 110 V, 50 Hz, single phase transformer has a no-load current on the HV side, of 0,5 A at a power factor of 0.36 lagging. Answer the following questions regarding this transformer: 3.1 If a load current of 24 A flows on the LV side, at a power factor of 0.8 lagging, find the value of the primary current and the power factor.   State the assumption and sketch the phasor diagram representing this situation.    (10) 3.2...
A 2.2 KVA, 440---220 V, 60 Hz, step-down transformer has the following parameters: Rp= 3.0 Ω,...
A 2.2 KVA, 440---220 V, 60 Hz, step-down transformer has the following parameters: Rp= 3.0 Ω, Xp= 4.0 Ω, Rs= 2.5 Ω, Xs= 2.0 Ω, Rc= 60 KΩ, and Xm = 15 KΩ. The transformer is operating at full load with a power factor of 0.707 lagging. The magnetizing branch impedance can be ignored. a) Draw the transformer’s equivalent T-circuit, b) Find the equivalent winding impedance referred to the high side, c) Calculate the primary and secondary currents, d) Determine...
A 20 kVA single phase transformer 4800/480V has primary resistance and reactance of 5Ω and 15Ω...
A 20 kVA single phase transformer 4800/480V has primary resistance and reactance of 5Ω and 15Ω respectively, while the resistance and reactance of secondary winding is 0.1Ω and 0.15 Ω respectively. Calculate: (i) The parameter referred to primary side of transformer and draw the equivalent circuit (ii) The approximate value of secondary voltage at full load power factor of 0.8 lagging if 4.8kV primary supply
A 250/125 V, 5 kVA single phase transformer has primary resistance of 0.2 ohm and reactance...
A 250/125 V, 5 kVA single phase transformer has primary resistance of 0.2 ohm and reactance of o.75 ohm. The secondary resistance is 0.05 ohm and reactance of o.2 ohm. Determine its regulation while supplying full load on 0.8 leading pf
Transformer Specifications S = 100 kVA 4800 – 240 V 60 Hz Core Loss = 0.5%...
Transformer Specifications S = 100 kVA 4800 – 240 V 60 Hz Core Loss = 0.5% Resistance = 1.5% Reactance = 3.4% It is operating at rated conditions with an 80% power factor. a. Determine the efficiency at the rated load. b. Determine the efficiency at 70% of the rated load and 80% power factor.
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 single phase transformer rated at 3000 KVA, 69kV, 60 Hz has a total internal impedance...
A single phase transformer rated at 3000 KVA, 69kV, 60 Hz has a total internal impedance Zp of 127ohm, referred to the primary side. Calculate: a) primary and secondary currents b) voltage regulation from no load to full load for 2000 kW resistive load, knowing that the primary voltage supply is fixed at 69 kV. c) primary and secondary currents if the secondary is accidentally short circuited.
Plate values ​​of a three-phase transformer are given below: 1600 kVA, 15 kV / 400 V,...
Plate values ​​of a three-phase transformer are given below: 1600 kVA, 15 kV / 400 V, 50 Hz, io = 1.2%; ukN = 6%, idle losses 2450 W, rated copper losses of power 14500 W; Dy5. a) Calculate primary and secondary line and phase currents. b) Secondary at 75% load in power factor with 0.85 inductance and 0.85 capacity calculate the voltage separately. Compare and interpret the results. capacity at what time of day can the upload be seen? To...
Plate values ​​of a three-phase transformer are given below: 1600 kVA, 15 kV / 400 V,...
Plate values ​​of a three-phase transformer are given below: 1600 kVA, 15 kV / 400 V, 50 Hz, io = 1.2%; ukN = 6%, idle losses 2450 W, rated copper losses of power 14500 W; Dy5. a) Calculate primary and secondary line and phase currents. b) Secondary at 75% load in power factor with 0.85 inductance and 0.85 capacity calculate the voltage separately. Compare and interpret the results. capacity at what time of day can the upload be seen? To...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT