In a laboratory there is a special equipment with a three-phase symmetrical load with three resistances each of R = 33 ‌Ω. Phase voltage Uf =289 V and frequency f = 50 Hz. a) Calculate main voltage b) Calculate the power that develops in the machine at Y connection . c) Calculate the current in each individual resistor in Y connection

In a laboratory there is a special equipment with a three-phase symmetrical load with three resistances each of R = 33 ‌Ω. Phase voltage Uf =289 V and frequency f = 50 Hz. a) Calculate main voltage b) Calculate the power that develops in the machine at Y connection . c) Calculate the current in each individual resistor in Y connection

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter2: Fundamentals

Section: Chapter Questions

Problem 2.30P: Figure 2.26 shows three loads connected in parallel across a 1000-V(RMS),60Hz single-phase source....

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Figure 2.26 shows three loads connected in parallel across a 1000-V(RMS),60Hz single-phase source. Load 1: Inductive load, 125kVA,0.28PF lagging. Load 2: Capacitive load, 10kW,40kvar. Load 3: Resistive load, 15kW. (a) Determine the total kW, kvar, kva, and supply power factor. (b) In order to improve the power factor to 0.8 lagging. a capacitor of negligible resistance is connected in parallel with the above loads. Find the kvar rating of that capacitor and the capacitance in F. Comment on the magnitude of the supply current after adding the capacitor.
For the circuit shown in Figure 2.24, compute the voltage across the load terminals.
In a specially designed three-phase water heater there are three resistances of 150.0 each. Water heater is connected to mains voltage 850 V. a) Determine the phase voltage b) Determine the effect developed in the whole water heater in case of Y-connection. c) Determine the power developed in the entire water heater at D connection.
A 415 V, 50 Hz, 3-phase supply is connected to a star-connected balanced load.Each phase of the load consists of a resistance of 25  and inductance 100mH,connected in series. Calculate (a) phase voltage, (b) the line current drawn from thesupply, and (c) the power dissipated.
Consider a house that has a 120V mains with mains frequencyof 60hz and a service current of 100A, which follows the safety standards of theresidential facilities.(a) Calculate the maximum power capacity.(b) Within the safety limit, the following devices can all operate at the sametime? If yes, what is the total power consumed? If not, what happens if all devicesare turned on at the same time and suggest a solution to the problem?- 4800W clothes dryer.- 400W washing machine.- 1200W dishwasher.- 1000W iron.- 860W air conditioning.- 150W color television.- 110W stereo sound.- 2400W electric stove.- 1200W microwave oven.- 1800W cooler.(c) Assuming that 60% of the maximum power were used daily, what is the total costper month for a kWh value of 10 cents?(d) Sketch the waveform, determine the phase difference and calculate the rms values of thefollowing waveforms: v(t) = 60 sin(wt + 20) and i(t) = 12 sin(wt - 20).
2.1 Two power stations, A and B, are synchronized at 66 kV. They are inter-connected by a transmission line with an inductive reactance of 6.7-Ω and resistance of 3.5-Ω per phase. The voltage of power station A is advanced with an angle of 10.5 degrees with respect to the voltage of power station B. The loading of power station B has a real power of 200 MW. The respective loads of the two power stations are as follows: Power station A: 165 MVA at a power factor of 0.819 lagging. Power station B: The reactive power consumed by the load is 155 Mvar. *Round off to two decimal places to every question 15.The active power loss within the interconnector (MW). 16.The reactive power loss within the interconnector (MVar). 17.The final loading of power station A (MVA) and it's angle
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A factory has the following load with power factor of 0.9 lagging in each phase. Red phase 40 A, yellow phase 50 A and blue phase 60 A. If the supply is 400 V, three phase, four-wire, calculate:(a) the current in the neutral(b) the total active power.(c ) Draw a phasor diagram for phase and line quantities. Assume that, relative to the current in the red phase, the current in the yellow phase lags by 120° and that in the blue phase leads by 120°.5.
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This wind farm needs a 250 km connection laid to Sommerville. The choice is either a 3 phase system or a bipolar dc system at 400 kV and ±400 kV at the receiving end respectively. (i) The 3-phase system has resistive losses per phase of 0.1 Ω/km. Calculate the system losses (in watts) when delivering 0.8 GW. (ii) The bipolar dc system has resistive losses of 0.1 Ω/km. Calculate the system losses (in watts) when delivering 0.8 GW. (iii) Calculate the efficiencies of the two systems. (iv) Comment on which system you would choose to use and why.
A 3-, 400-V symmetrical supply feeds a star-connected load consisting of non-reactive resistors of 3, 4 and 5 connected to the R. Y and 8 lines respectively. The phase sequence is RYB. Calculate (1) the load star point potential (i) current in each resistor and power dissipated in each resistor.