A three-phase positive sequence Y-connected source supplies 12 kVA with a power factor of 0.75 lagging...

A three-phase positive sequence Y-connected source supplies 12 kVA with a power factor of 0.75 lagging to a parallel combination of a Y-connected load and a Δ-connected load. The Y-connected load uses 6 kVA at a power factor of 0.6 lagging and has an a-phase current of 12∠−30∘A

Part A: Find the complex power per phase of the Δ-connected load. (VA)

Part B: Find the magnitude of the voltage. (Volts)

Expert Solution

Manojponduru answered 3 months ago

Q1. A station supplies 250 kVA at a lagging power factor (p.f) of 0·8. A synchronous...

Q1. A station supplies 250 kVA at a lagging power factor (p.f) of 0·8. A synchronous motor is connected in parallel with the load. If the combined load is 250 kW with a lagging p.f. of 0.9, determine : (i) the leading kVAR taken by the motor. (ii) kVA rating of the motor. (iii) p.f. at which the motor operates. Q2. A factory consists of the following (i) An induction motor of 150 h.p with 0.7 p.f lagging and 80%...

1) A 25 kVA transformer supplies a load of 12 kW at power factor of 0.6...

1) A 25 kVA transformer supplies a load of 12 kW at power factor of 0.6 lagging. How much kVA can be added before the transformer is at rated load a)when the added load is at 1.0 pf? b)when the added load is at 0.866 pf leading?

Table 1 Load Rating Power Factor Lighting 41.1kW 0.7 Lagging Lights 12.2 kVa 0.67 Lagging Ventilation...

Table 1 Load Rating Power Factor Lighting 41.1kW 0.7 Lagging Lights 12.2 kVa 0.67 Lagging Ventilation fans 9 kVa 0.7 lagging Heat pump 18 kW 0.707 Lagging misc equipment 11.3 kVa 0.55 lagging peak charging demand 209 kW unity Calculate the following for the car park using the data from Table 1: a) the maximum real power demand P (kW) b) maximum reactive power demand Q (kVAr) c) the total apparent power demand S (kVA) d) also, calculate the maximum...

A 280-V, 3Ø AC power system, Y-connected three-phase generator connected through a three-phase transmission line to...

A 280-V, 3Ø AC power system, Y-connected three-phase generator connected through a three-phase transmission line to a Y-connected load. The transmission line has an impedance of (0.02+j0.4) Ω/phase, and the load has an impedance of (4+j3) Ω per phase. Determine the;(a)line current (IL) at the load [2Marks] (b)line and phase voltage of the load[2 Marks](c)active power, reactive and apparent power [2 Marks](d) power factor and specify whether it is lagging or leading. [4 Marks]

A balanced positive-sequence wye-connected 60-Hz three-phase source has line-to-line voltages of VL = 440 V rms....

A balanced positive-sequence wye-connected 60-Hz three-phase source has line-to-line voltages of VL = 440 V rms. This source is connected to a balanced wye-connected load. Each phase of the load consists of a 0.5-H inductance in series with a 50-? resistance. Assume that the phase of Van is zero. A) Find the line-to-neutral voltage phasor Van. Enter your answer using polar notation. Express argument in degrees. B) Find the line-to-neutral voltage phasor Vbn. Enter your answer using polar notation. Express...

A balanced three-phase delta-connected load is connected to a balanced three-phase delta-connected source via a transmission...

A balanced three-phase delta-connected load is connected to a balanced three-phase delta-connected source via a transmission line. The line-line voltage for the source is 100∟0° V/phase and the impedance of load is (27 + j18) Ω/phase. The transmission line has an impedance of (1 + j4) Ω/line. a) Draw the complete schematic of the power system showing the location of wattmeters. (Two-Wattmeter system is considered for this problem). Phase “a” could be considered as a reference phase. b) What must...

2.A n+400-k VA, 2300+n- 230+n-v, 60-hz transformer supplies a 0.8 lagging power-factor load whose KVA Is...

2.A n+400-k VA, 2300+n- 230+n-v, 60-hz transformer supplies a 0.8 lagging power-factor load whose KVA Is adjustable from no load to 120 percent rated KVA. The percent resistance, percent reactance, and percent core loss are m+1.56, m+3.16, and m+0.42 respectively. For 2 KVA increments of load, tabulate and plot the efficiency of the transformer from no load to 120 percent rated load. Use Matlab n=20 m=.2

An unbalanced three-phase wye-connected and grounded load is connected to a balanced three-phase four-wire source. The...

An unbalanced three-phase wye-connected and grounded load is connected to a balanced three-phase four-wire source. The load impedances are Za = 14+j3 Ω , Zb = 5-j24Ω and Zc =1+j14 Ω and the phase a line voltage has an effective value of 18 Kv: use line-to-neutral voltage of phase A as a reference. Find the line and neutral current, also find the reactive power delivered to load and power factor.

480 V, 200 kVA, 08 PF lagging, 60 Hz two pole Y connected synchronous generator has...

480 V, 200 kVA, 08 PF lagging, 60 Hz two pole Y connected synchronous generator has a synchronous reactance of 0.25 Ω and an armature resistance of 0.03 Ω. At 60 Hz, its friction and windage losses are 6 kW, and its core losses are 4 kW. The field circuit has a dc voltage of 200 V, and the maximum IF is 10 A. The resistance of the field circuit is adjustable over the range from 20 to 200 Ω....

Consider two equal non sallent pole three phase 60 cycle Y connected 6600 volt 10000-kva synchronous...

Consider two equal non sallent pole three phase 60 cycle Y connected 6600 volt 10000-kva synchronous generators, each wuth an effective resistance of 0.063 ohm per phase and a synchronous reactance of 1.52 ohm per phase. Assume that the resistances and reactances of the generators are constant. These generators in parallel carry an inductive load of 18000 kva at 0.9 power factor. (a) find the excitation voltages of the generators and their power angles when they share the kw load...

Question