A commercial Building, 60hz, Three Phase System, 230V with total highest Single Phase Ampere Load of 1,088 Amperes, plus the three-phase load of 206Amperes including the highest rated of a three-phase motor of 25HP, 230V, 3Phase, 68Amp Full Load Current. Determine the Following through showing your calculations. The Size of THHN Copper Conductor (must be conductors in parallel, either 2 to 5 sets),TW Grounding Copper Conductor in EMT Conduit. b. The Instantaneous Trip Power Circuit Breaker Size c. The Transformer Size d. Generator Size

A commercial Building, 60hz, Three Phase System, 230V with total highest Single Phase Ampere Load of 1,088 Amperes, plus the three-phase load of 206Amperes including the highest rated of a three-phase motor of 25HP, 230V, 3Phase, 68Amp Full Load Current. Determine the Following through showing your calculations. The Size of THHN Copper Conductor (must be conductors in parallel, either 2 to 5 sets),TW Grounding Copper Conductor in EMT Conduit. b. The Instantaneous Trip Power Circuit Breaker Size c. The Transformer Size d. Generator Size

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 3.56P: Three single-phase two-winding transformers, each rated 3kVA,220/110volts,60Hz, with a 0.10 per-unit...

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Three single-phase two-winding transformers, each rated 3kVA,220/110volts,60Hz, with a 0.10 per-unit leakage reactance, are connected as a three-phase extended autotransformer bank, as shown in Figure 3.36(c). The low-voltage winding has a 110 volt rating. (a) Draw the positive-sequence phasor diagram and show that the high-voltage winding has a 479.5 volt rating. (b) A three-phase load connected to the low-voltage terminals absorbs 6 kW at 110 volts and at 0.8 power factor lagging. Draw the per-unit impedance diagram and calculate the voltage and current at the high-voltage terminals. Assume positive-sequence operation.
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