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a) Discuss two (2) advantages and disadvantages of using three single-phase transformers instead of a composite three-phase transformer?

a) Discuss two (2) advantages and disadvantages of using three single-phase transformers instead of a composite three-phase transformer?

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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The university has privately contracted your company to rewire the mechanical workshop in the Faculty of Engineering. During a site visit, you observed that the building receives a 400V, 60HZ, star-connected, three-phase supply from the utility. There are also several three-phase equipment in the workshop including bench lathes, drill presses and welding machines that require a 230V three-phase supply. You have decided to utilize three single-phase, dry type transformers to step down the building's incoming supply to a 230V, delta-connected supply for the equipment. All the three-phase machinery can be modelled as an equivalent balanced three-phase star- connected load with a resistance and inductance of 0.52 and 0.16mH respectively per phase. Some preliminary calculations and analysis are required before starting the wiring design. a) Discuss two (2) advantages and disadvantages of using three single-phase transformers instead of a composite three-phase transformer? b) Draw a labelled diagram of the entire three phase system clearly showing all known voltages (phase and line values) and the three phase configurations of all components. c) Assuming the transformer is ideal and lossless and that all neutrals are grounded, calculate: i) The phase voltages of the star-connected load ii) The line currents between the transformer and load iii) The phase currents in the transformer secondary windings iv) The total apparent power supplied to the load
Transcribed Image Text:The university has privately contracted your company to rewire the mechanical workshop in the Faculty of Engineering. During a site visit, you observed that the building receives a 400V, 60HZ, star-connected, three-phase supply from the utility. There are also several three-phase equipment in the workshop including bench lathes, drill presses and welding machines that require a 230V three-phase supply. You have decided to utilize three single-phase, dry type transformers to step down the building's incoming supply to a 230V, delta-connected supply for the equipment. All the three-phase machinery can be modelled as an equivalent balanced three-phase star- connected load with a resistance and inductance of 0.52 and 0.16mH respectively per phase. Some preliminary calculations and analysis are required before starting the wiring design. a) Discuss two (2) advantages and disadvantages of using three single-phase transformers instead of a composite three-phase transformer? b) Draw a labelled diagram of the entire three phase system clearly showing all known voltages (phase and line values) and the three phase configurations of all components. c) Assuming the transformer is ideal and lossless and that all neutrals are grounded, calculate: i) The phase voltages of the star-connected load ii) The line currents between the transformer and load iii) The phase currents in the transformer secondary windings iv) The total apparent power supplied to the load
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