ZuoTi.Pro
Question

A transformer has a primary rating of 480 volts and supplies 240 volts to a 7.4...

A transformer has a primary rating of 480 volts and supplies 240 volts to a 7.4 kVA load. The circuit that is connected to the primary originates from a 2-pole circuit breaker in a 277/480-volt 3 phase, 4-wire panelboard. The current measured in one of the circuit conductors connected to the breakers is 15.9 amps. The efficiency of this transformer is ___%

engineering   Electrical-Engineering   
0 0
Add a comment Improve this question Transcribed image text
Next > < Previous
Sort answers by oldest

Homework Answers

Answer #1

0 0
Add a comment
Know the answer?
Add Answer to:
A transformer has a primary rating of 480 volts and supplies 240 volts to a 7.4...
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. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions

  • When a 15 kVA 480 primary, 120-volt secondary 2-wire secondary transformer is connected to a 11.5...

    When a 15 kVA 480 primary, 120-volt secondary 2-wire secondary transformer is connected to a 11.5 kW 120-volt load, the transformer is supplying ____ amps to the load. (a.) 31.25 (B.) 54.127 (c.) 95.83 (d.) none of these

  • A single-phase 100-kVA, 2400/240-volt, 60-Hz distribution transformer is used as a step-down transformer. The load, which...

    A single-phase 100-kVA, 2400/240-volt, 60-Hz distribution transformer is used as a step-down transformer. The load, which is connected to the 240-volt secondary winding, absorbs 80 kVA at 0.8 power factor lagging and is at 230 volts. Assuming an ideal transformer, calculate the following: a) primary voltage. b) load impedance. c) load impedance referred to the primary. d) the real and reactive power supplied to the primary winding

  • 3.4 A single-phase 100-kVA, 2400/240-volt, 60-Hz distribution transformer is used as a step-down transformer. The load,...

    3.4 A single-phase 100-kVA, 2400/240-volt, 60-Hz distribution transformer is used as a step-down transformer. The load, which is connected to the 240-volt secondary wind- ing, absorbs 80 kVA at 0.8 power factor lagging and is at 230 volts. Assuming an ideal transformer, calculate the following: (a) primary voltage, (b) load impedance, (c) load impedance referred to the primary, and (d) the real and reactive power sup- plied to the primary winding.

  • Given: 100kVA single phase transformer, Z=1.5% Primary: 480V 2 wire Secondary: 120/240V 3 wire Install the...

    Given: 100kVA single phase transformer, Z=1.5% Primary: 480V 2 wire Secondary: 120/240V 3 wire Install the above transformer to serve a branch circuit panelboard. The panelboard will be located 10' from the transformer. The primary side raceway is PVC and the secondary raceway is EMT. All calculations will conform to applicable NEC regulations. The primary side, overcurrent protection device, will be chosen based on the next available standard size of the full load amps of the transformer. The secondary side,...

  • Rework problem 3.4 if the load connected to the 240-V secondary winding absorbs 110 kVA under...

    Rework problem 3.4 if the load connected to the 240-V secondary winding absorbs 110 kVA under short-term overload conditions at an 0.8 power factor leading and at 230 volts. Reference of problem 3.4 A single phase 100-kVA 2400/240-volt 60 Hz distribution transformer is used as a step down transformer. The load, which is connected to the 240-volt secondary winding, absorbs 60kVA at 0.8 power factor lagging and is at 230 volts. Assuming an ideal transformer, calculate the following: a) primary...

  • 1. If 480 volts is applied to the primary winding of a transformer which has 300...

    1. If 480 volts is applied to the primary winding of a transformer which has 300 turns in the primary winding and 15 turns in the secondary winding, the secondary voltage will be A. 0.0417 volts. C. 56.8 volts B. 24 volts. D. 9600 volts. 2. A distribution transformer with a grain-orientented steel core is highly efficent because its A. exciting current is sufficiently high. B. flux direction is parallel to the stell-rolling direction C. permeability is increased due to...

  • A three-phase Yy0 connected transformer has a nominal rating of 250 kVA and a voltage ratio...

    A three-phase Yy0 connected transformer has a nominal rating of 250 kVA and a voltage ratio 15:0.4 kV. After conducting the short-circuit test, where the secondary winding is short-circuited, it is found that the primary series resistance is 0.08 pu and the primary series impedance magnitude is 0.1pu. The effect of the parallel branch in the transformer’s equivalent circuit may be neglected. Explain what information ‘Yy0’ gives about the transformer. Draw the per-phase equivalent circuit of the transformer during the...

  • Scenario 220.53 The secondary of a 300 KVA transformer delivers power to a 180- amp, 30...

    Scenario 220.53 The secondary of a 300 KVA transformer delivers power to a 180- amp, 30 load. This is a 480 – 240 volt A-A transformer. Primary and secondary conductors are the minimum size required to serve the load. Refer to Scenario 220.53. The secondary OCPD can have a rating no greater than __amps. Select one: O a. 100 O b. 200 O c. 150 d. none of these e. 175

  • Question 2 A single-phase transformer has the following nameplate ratings: 100 kVA, 7200/240 V and 60...

    Question 2 A single-phase transformer has the following nameplate ratings: 100 kVA, 7200/240 V and 60 Hz. The following results are obtained from open-circuit and short-circuit tests: Test Open-circuit Short-circuit Voltage 7200 V 250 V Current 0.65 A 13.89 A Real Power Input 425 W 1420 W a) Determine the parameters of this transformer, all referred to the primary side. b) The secondary of this transformer is connected to a load that draws 100% of the rated power at rated...

  • (BEKG 2433/BEKP 2323) c) You are required to inspect a new purchased transformer rating as shown...

    (BEKG 2433/BEKP 2323) c) You are required to inspect a new purchased transformer rating as shown in Table Q3(c). The HV winding (primary) of the transformer is connected to the alternating power supply of 2200V and the LV winding (secondary) is connected to a load of 22 236.9", find all the values in Table 1. Table Q3(c): A typical transformer nameplate ABB transformer Volt-amperage: 50 KVA Single-phase HV winding: 2400 V LV winding: 240 V Frequency: 60 M2 Percent impedance:...

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT