Question

For a section of a substation and a switchboard with a 500 kW motor feeder and...

For a section of a substation and a switchboard with a 500 kW motor feeder and a 1500 kVA transformer feeder at 6.6 kV operating voltage calculate:

  • The current of the transformer feeder.
  • The current of the motor feeder.

Assume power factor as 0.85 and motor efficiency as 90%.

Show all calculations.

Homework Answers

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
The 400 V, 50 kVA, 0.8 power factor leading delta connected synchronous motor has synchronous reactance...
The 400 V, 50 kVA, 0.8 power factor leading delta connected synchronous motor has synchronous reactance of 3-ohm, resistance neglected. It is supplying a 12-kW load with initial power factor of 0.86 lagging. The windage and friction losses are 2.0 kW and the core losses are 1.5 kW. Determine (a) the motor efficiency; the line current; armature current; and excitation voltage. (b) If the flux of the motor is increased by 20 percent determine the excitation voltage; armature current; and...
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...
A 100 KW (OUT PUT), 3300V, 50 Hz, 3-Phase star connected induction motor has a synchronous...
A 100 KW (OUT PUT), 3300V, 50 Hz, 3-Phase star connected induction motor has a synchronous speed of 500 rpm. The full load slip is 1.8%and full load power factor 0.85. Stator copper loss=2440W. Iron loss=3500W. Rotational losses= 1200W. calculate : The rotor copper loss The line current The full load motor efficiency.
Q4) A three-phase, 104 kW, 3300 V, 50 Hz, Y-connected induction motor delivers full output power...
Q4) A three-phase, 104 kW, 3300 V, 50 Hz, Y-connected induction motor delivers full output power to a load connected to its shaft. The full-load slip is 0.02 and full-load power factor is 0.85 lagging. If the stator copper loss is 2400 W, the stator core loss is 3500 W, and the friction and windage loss is 1200 W. Calculate: (i) The developed mechanical power. (ii) The air gap power. (iii) The rotor copper loss. (iv) The efficiency of the...
A 2300-V, 400-hp, 60-Hz, 1200rpm, Y-connected synchronous motor has a rated power factor of 0.8 leading....
A 2300-V, 400-hp, 60-Hz, 1200rpm, Y-connected synchronous motor has a rated power factor of 0.8 leading. The efficiency of the motor is 90 % at full load. The armature resistance is 0.3 Ω, and the synchronous reactance is 3.55 Ω. Answer the following questions when it is operating at full load; Question 1 What is the number of poles in this motor? 2 4 6 8 10 12 Question 2 Find the output torque in Nm.(Assume 1hp=745.7W) 1985.7 2373.6 2011.9...
A three phase, 200 kW, 2300 V, 50 Hz star (wye) connected non-salient rotor synchronous motor...
A three phase, 200 kW, 2300 V, 50 Hz star (wye) connected non-salient rotor synchronous motor has a synchronous reactance of 11 Ohms per phase. When it draws 175 kW the power angle is 10 electrical degrees. Neglect the ohmic losses. a. Determine the excitation voltage per phase. b. Calculate the supply line current. c. Determine the supply power factor. d. Draw the phasor diagram. e. By what percentage should the field current be changed to minimize the line current.
Problem 2. A three phase transformer rated at 5 MVA, 115/13.2 kV has a per phase...
Problem 2. A three phase transformer rated at 5 MVA, 115/13.2 kV has a per phase series impedance of 0.007 + j0.075 per unit (shunt parameters are ignored). The low voltage side is connected to a short distribution line which modeled by a series per phase impedance of 0.02 +j0.1 per unit on the base of 10 MVA. The line supplies a balanced three phase constant impedance load at 4 MVA, 13.2 kV with power factor of 0.85 lagging •...
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 5-kW, 220-V shunt motor has an armature resistance of 0.15 ? and a field-circuit resistance...
A 5-kW, 220-V shunt motor has an armature resistance of 0.15 ? and a field-circuit resistance of 100 ?. The motor delivers rated output power at rated voltage when its armature current is 20 A. When the motor is operating at rated voltage, the speed is observed to be 1000 r/min when the machine is loaded such that the armature current is 15 A. In order to protect both the motor and the dc supply under starting conditions, an external...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT