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4.7. Consider a three-phase, 12.47 kV system supplying a 600 kVA load, pf 0.8 lagging. Determine...
5.3. Given a 600 kVA 12.47 kV 0.85 pf lagging three-phase load: a. Compute the corresponding...
5.3. Given a 600 kVA 12.47 kV 0.85 pf lagging three-phase load: a. Compute the corresponding complex power. b. Compute the corresponding wye and delta complex impedances Answers: a) S3p - (510 j316.1)kVA,S10 (170 +j105.4)kVA b) Zy (220.3+1 36.5), (660.9j409.5)2
A three-phase load of 15 kVA with a PF of 0.8 lagging is connected in parallel...
A three-phase load of 15 kVA with a PF of 0.8 lagging is connected in parallel with a three-phase load of 36 kW at 0.6 PF leading. The line-line voltage is 2000V. a) Find the total complex power and power factor. Is it inductive or capacitive? b) How much kVAR is needed to make the PF unity? c) What is the magnitude of the current going into the total load?
3. A 12.47 kV feeder provides service to an unbalanced wye-connected load specified to be: Phase ...
Response: Me neither :/
3. A 12.47 kV feeder provides service to an unbalanced wye-connected load specified to be: Phase a: 1000 kVA, 0.9 lagging power factor Phase b: 800 kVA, 0.95 lagging power factor Phase c: 1100 kVA, 0.85 lagging power factor a) Compute the initial load currents assuming that 60% of the load is complex power, 25% constant current, and 15% constant impedance. b) Determine the currents at the start of the second iteration if the load voltages...
Three single-phase transformers rated at 250 kVA, 7200 V/600 V, 60 Hz, are connected in wye- delta on a 12.47 kv, 3-phase line. If the load is 450 kVA, calculate: a. The currents in the incoming a...
Three single-phase transformers rated at 250 kVA, 7200 V/600 V, 60 Hz, are connected in wye- delta on a 12.47 kv, 3-phase line. If the load is 450 kVA, calculate: a. The currents in the incoming and outgoing transmission lines b. The currents in the primary and secondary windings 1. sratod t 200 w 3o0 v/6oO V 60 Hz are used to raise the
Three single-phase transformers rated at 250 kVA, 7200 V/600 V, 60 Hz, are connected in wye-...
4- - a 3-phase load of 500 MVA ,120 KV at 0.8 p.f lagging find: -...
4- - a 3-phase load of 500 MVA ,120 KV at 0.8 p.f lagging find: - The magnitude of line current I Line – Three-phase (real) power Pload - Phase a |1ine) = ? 30, 500 MVA, 0.8 pf lagging line-to-line Phaseb Phasec
A three-phase feeder has line voltage of 13.8 kV and supplies load of 7000 kVA at...
A three-phase feeder has line voltage of 13.8 kV and supplies load of 7000 kVA at power factor of 0.8 lagging. Find: The feeder current in A, real power in kW and Reactive power in kVAr. The capacitor size in kVAr to improve the power factor to 0.98. The feeder power in kW and kVA and current in A, after installing the capacitor bank.
A 1500-kVA, 6.6 kV, 50 Hz, 6-pole, three-phase, star-connected synchronous generator has a resistance 0.5Q/phase and a...
A 1500-kVA, 6.6 kV, 50 Hz, 6-pole, three-phase, star-connected
synchronous generator has a resistance 0.5Q/phase and a synchronous
reactance of 5Q/phase. The generator is supplying its rated power
at its rated voltage and at a power factor lagging. The rotational
loss is 2 kW. Calculate:
(a) the power developed,
(b) the power angle,
(c) the voltage regulation, and
(d) the shaft torque.
A 1500-kVA, 6.6 kV, 50 Hz, 6-pole, three-phase, star-connected synchronous generator has a resistance 0.50/phase and a synchronous...
1, Two balanced three-phase loads are in parallel. Load 1 draws 10 kW at 0.8 PF...
1, Two balanced three-phase loads are in parallel. Load 1 draws 10 kW at 0.8 PF lagging Load 2 draws 20 kVA at 0.6 PF leading a. b. The loads are supplied by a balanced three-phase 480 Vu source. (a) Draw the power triangle for the combined load. (b) Determine PF of the combined load. (c) Determine the magnitude of the line current from the source. (d) Y-connected inductors are now installed in parallel with the combined load. What value...
(30) Assume that a distribution substation, shown below, has a 4000 kVA 69/12.47 kV LTC 4)...
(30) Assume that a distribution substation, shown below, has a 4000 kVA 69/12.47 kV LTC 4) transformer feeding a three-phase four-wire 12.47 kV distribution system. The transformer has a reactance of 0.065 pu. Assume that fault impedance is 40 Q and that the maximum and minimum power generations of the system are 600 and 360 MVA, respectively. Use 1 MVA as the three-phase power base: a) Under the maximum (system) power generation conditions, determine the available three- phase, L-L, and...
(30) Assume that a distribution substation, shown below, has a 4000 kVA 69/12.47 kV LTC 4)...
(30) Assume that a distribution substation, shown below, has a 4000 kVA 69/12.47 kV LTC 4) transformer feeding a three-phase four-wire 12.47 kV distribution system. The transformer has a reactance of 0.065 pu. Assume that fault impedance is 40 Q and that the maximum and minimum power generations of the system are 600 and 360 MVA, respectively. Use 1 MVA as the three-phase power base: a) Under the maximum (system) power generation conditions, determine the available three- phase, L-L, and...
5.3. Given a 600 kVA 12.47 kV 0.85 pf lagging three-phase load: a. Compute the corresponding complex power. b. Compute the corresponding wye and delta complex impedances Answers: a) S3p - (510 j316.1)kVA,S10 (170 +j105.4)kVA b) Zy (220.3+1 36.5), (660.9j409.5)2
Response: Me neither :/
3. A 12.47 kV feeder provides service to an unbalanced wye-connected load specified to be: Phase a: 1000 kVA, 0.9 lagging power factor Phase b: 800 kVA, 0.95 lagging power factor Phase c: 1100 kVA, 0.85 lagging power factor a) Compute the initial load currents assuming that 60% of the load is complex power, 25% constant current, and 15% constant impedance. b) Determine the currents at the start of the second iteration if the load voltages...
Three single-phase transformers rated at 250 kVA, 7200 V/600 V, 60 Hz, are connected in wye- delta on a 12.47 kv, 3-phase line. If the load is 450 kVA, calculate: a. The currents in the incoming and outgoing transmission lines b. The currents in the primary and secondary windings 1. sratod t 200 w 3o0 v/6oO V 60 Hz are used to raise the
Three single-phase transformers rated at 250 kVA, 7200 V/600 V, 60 Hz, are connected in wye-...
4- - a 3-phase load of 500 MVA ,120 KV at 0.8 p.f lagging find: - The magnitude of line current I Line – Three-phase (real) power Pload - Phase a |1ine) = ? 30, 500 MVA, 0.8 pf lagging line-to-line Phaseb Phasec
A 1500-kVA, 6.6 kV, 50 Hz, 6-pole, three-phase, star-connected
synchronous generator has a resistance 0.5Q/phase and a synchronous
reactance of 5Q/phase. The generator is supplying its rated power
at its rated voltage and at a power factor lagging. The rotational
loss is 2 kW. Calculate:
(a) the power developed,
(b) the power angle,
(c) the voltage regulation, and
(d) the shaft torque.
A 1500-kVA, 6.6 kV, 50 Hz, 6-pole, three-phase, star-connected synchronous generator has a resistance 0.50/phase and a synchronous...
1, Two balanced three-phase loads are in parallel. Load 1 draws 10 kW at 0.8 PF lagging Load 2 draws 20 kVA at 0.6 PF leading a. b. The loads are supplied by a balanced three-phase 480 Vu source. (a) Draw the power triangle for the combined load. (b) Determine PF of the combined load. (c) Determine the magnitude of the line current from the source. (d) Y-connected inductors are now installed in parallel with the combined load. What value...
(30) Assume that a distribution substation, shown below, has a 4000 kVA 69/12.47 kV LTC 4) transformer feeding a three-phase four-wire 12.47 kV distribution system. The transformer has a reactance of 0.065 pu. Assume that fault impedance is 40 Q and that the maximum and minimum power generations of the system are 600 and 360 MVA, respectively. Use 1 MVA as the three-phase power base: a) Under the maximum (system) power generation conditions, determine the available three- phase, L-L, and...
(30) Assume that a distribution substation, shown below, has a 4000 kVA 69/12.47 kV LTC 4) transformer feeding a three-phase four-wire 12.47 kV distribution system. The transformer has a reactance of 0.065 pu. Assume that fault impedance is 40 Q and that the maximum and minimum power generations of the system are 600 and 360 MVA, respectively. Use 1 MVA as the three-phase power base: a) Under the maximum (system) power generation conditions, determine the available three- phase, L-L, and...
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