1.a. To create usable voltages for 120-volt loads, _______ are usually installed. A. photovoltaic arrays B. transformers C. wind power turbines D. generators 1.b. Which grounding method is typically required of higher-voltage systems? A. Grounding through a high-impedance device B. Grounding through a low amount of resistance C. Grounding through inductors D. Grounding through surge arresters

1.a. To create usable voltages for 120-volt loads, _______ are usually installed. A. photovoltaic arrays B. transformers C. wind power turbines D. generators 1.b. Which grounding method is typically required of higher-voltage systems? A. Grounding through a high-impedance device B. Grounding through a low amount of resistance C. Grounding through inductors D. Grounding through surge arresters

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

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.58P: A single-phase two-winding transformer rated 90MVA,80/120kV is to be connected as an autotransformer...

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Similar questions

With the same transformer banks as in Problem 3.47, Figure 3.41 shows the oneline diagram of a generator, a step-up transformer bank, a transmission line, a stepown transformer bank, and an impedan load. The generator terminal voltage is 15 kV (line-to-line). (a) Draw the per-phase equivalent circuit, aounting for phase shifts for positive-sequence operation. (b) By choosing the line-to-neutral generator terminal voltage as the reference, determine the magnitudes of the generator current, transmiss ion-line current, load current, and line-to-line load voltage. Also, find the three-phase complex power delivered to the load.
Consider the oneline diagram shown in Figure 3.40. The three-phase transformer bank is made up of three identical single-phase transformers, each specified by X1=0.24 (on the low-voltage side), negligible resistance and magnetizing current, and turns ratio =N2/N1=10. The transformer bank is delivering 100 MW at 0.8 p.f. lagging to a substation bus whose voltage is 230 kV. (a) Determine the primary current magnitude, primary voltage (line-to-line) magnitude, and the three-phase complex power supplied by the generator. Choose the line-to-neutral voltage at the bus, Va as the reference Account for the phase shift, and assume positive-sequence operation. (b) Find the phase shift between the primary and secondary voltages.
Define the terms "load shedding" and "voltage regulation" in the context of power systems. How do these aspects impact the stability and reliability of an electrical grid?
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