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Determine the required load resistance to operate the transformer of Q3(b) at maximum efficiency when operating from a 230 V, 50 Hz supply. Indicate any approximations made as part of the calculations. A 3 phase delta/delta transformer steps 690 V up to 11 kV and has a total rating of 1.5 MVA. Determine the currents in the primary and secondary transformer windings (assuming 100% efficiency). Calculate the maximum MVA rating when the transformer operates in Open Delta configuration. Parameter Value Unite

Determine the required load resistance to operate the transformer of Q3(b) at maximum efficiency when operating from a 230 V, 50 Hz supply. Indicate any approximations made as part of the calculations. A 3 phase delta/delta transformer steps 690 V up to 11 kV and has a total rating of 1.5 MVA. Determine the currents in the primary and secondary transformer windings (assuming 100% efficiency). Calculate the maximum MVA rating when the transformer operates in Open Delta configuration. Parameter Value Unite

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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voltage and current) for the following changes to the transformer design or losses, regulation, no load current etc) and/or operating limits (maximum Q3 (a) Indicate the relevant changes in transformer performance (output voltage, operating conditions: A reduction in the number of secondary turns (i) (ii) An increase in the primary winding wire diameter. (iii) A decrease in the cross sectional area of the iron core (iv) An increase in the electrical supply frequency. The Open Circuit and Short Circuit results for a single phase transformer are shown in Table Q3b1 and Table Q3b2 respectively. From these results determine the turns ratio and equivalent circuit parameters for this (b) transformer. Determine the required load resistance to operate the transformer of Q3(b) (c) at maximum efficiency when operating from a 230 V, 50 Hz supply. Indicate any approximations made as part of the calculations. (d) A 3 phase delta/delta transformer steps 690 V up to 11 kV and has a total rating of 1.5 MVA. Determine the currents in the primary and secondary transformer windings (assuming 100% efficiency). Calculate the maximum MVA rating when the transformer operates in Open Delta configuration. Parameter Value Units Vp 230 V 0.87 Pp V 50 24 Table Q3b1 Parameter Value Units Vp 17 V A Pp 40 W Table Q3b2
Transcribed Image Text:voltage and current) for the following changes to the transformer design or losses, regulation, no load current etc) and/or operating limits (maximum Q3 (a) Indicate the relevant changes in transformer performance (output voltage, operating conditions: A reduction in the number of secondary turns (i) (ii) An increase in the primary winding wire diameter. (iii) A decrease in the cross sectional area of the iron core (iv) An increase in the electrical supply frequency. The Open Circuit and Short Circuit results for a single phase transformer are shown in Table Q3b1 and Table Q3b2 respectively. From these results determine the turns ratio and equivalent circuit parameters for this (b) transformer. Determine the required load resistance to operate the transformer of Q3(b) (c) at maximum efficiency when operating from a 230 V, 50 Hz supply. Indicate any approximations made as part of the calculations. (d) A 3 phase delta/delta transformer steps 690 V up to 11 kV and has a total rating of 1.5 MVA. Determine the currents in the primary and secondary transformer windings (assuming 100% efficiency). Calculate the maximum MVA rating when the transformer operates in Open Delta configuration. Parameter Value Units Vp 230 V 0.87 Pp V 50 24 Table Q3b1 Parameter Value Units Vp 17 V A Pp 40 W Table Q3b2
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