Two 7970-V:230-V single-phase transformers with impedance with respect to their secondaries of 1.5 +j3 and 2 + j4.5 ohms are connected in parallel to a 7900-V source. Their secondaries are supplying a common load of 30+ j40 ohms. A. What is the magnitude of the voltage across the load in volts? (2 decimal places) B. What is the magnitude of the total current supplied by the 7900-V source in amperes? (3 decimal places) C. What is the efficiency of the parallel transformers combined in percent? (1 decimal place)
Two 7970-V:230-V single-phase transformers with impedance with respect to their secondaries of 1.5 +j3 and 2 + j4.5 ohms are connected in parallel to a 7900-V source. Their secondaries are supplying a common load of 30+ j40 ohms. A. What is the magnitude of the voltage across the load in volts? (2 decimal places) B. What is the magnitude of the total current supplied by the 7900-V source in amperes? (3 decimal places) C. What is the efficiency of the parallel transformers combined in percent? (1 decimal place)
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 3.26P: A bank of three single-phase transformers, each rated 30MVA,38.1/3.81kV, are connected in Y- with a...
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Three-Phase Transformers
Three-segment transformers are a type of transformer used to transform voltages of electrical systems into three ranges. Two type transformers are shell-type transformer and core type transformer. In brief, it could be described because of the exquisite kinds of configurations.
Transformer
Ever since electricity has been created, people have started using it in its entirety. We see many types of Transformers in the neighborhoods. Some are smaller in size and some are very large. They are used according to their requirements. Many of us have seen the electrical transformer but they do not know what work they are engaged in.
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![Two 7970-V:230-V single-phase transformers with impedance with respect to their secondaries
of 1.5 + j3 and 2 + j4.5 ohms are connected in parallel to a 7900-V source. Their secondaries are
supplying a common load of 30 + j40 ohms.
A. What is the magnitude of the voltage across the load in volts? (2 decimal places)
B. What is the magnitude of the total current supplied by the 7900-V source in amperes? (3
decimal places)
C. What is the efficiency of the parallel transformers combined in percent? ( 1 decimal
place)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2dcb9451-ab99-40ce-a2dc-b7a39604dfac%2F3fedcedd-57b9-4c48-931c-15dee2022322%2F0r8anesn_processed.png&w=3840&q=75)
Transcribed Image Text:Two 7970-V:230-V single-phase transformers with impedance with respect to their secondaries
of 1.5 + j3 and 2 + j4.5 ohms are connected in parallel to a 7900-V source. Their secondaries are
supplying a common load of 30 + j40 ohms.
A. What is the magnitude of the voltage across the load in volts? (2 decimal places)
B. What is the magnitude of the total current supplied by the 7900-V source in amperes? (3
decimal places)
C. What is the efficiency of the parallel transformers combined in percent? ( 1 decimal
place)
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