Power transformers are used in the power system to change the voltage levels to a level suitable for generation, or transmission or distribution. They are three-phase transformers, and can either be constructed as a single-unit or a bank of three single-phase units. In a hydro power station, a number of synchronous generators are used to generate electricity at 17.5 kV. The voltage is stepped up to 330 kV for transmission by parallel connected three-phase transformers. Each three-phase transformer consists of a bank of three single-phase units with each unit rated 100 MVA, 50 Hz, 330/17.5 kV. (a) With good reasons, explain the most suitable connection of the windings on the high-voltage side and the low-voltage side of each three-phase transformer, respectively. (b) What are the advantages of using a bank of single-phase transformers for each three-phase unit? (c) What are the disadvantages of using a bank of single-phase transformers for each three-phase unit?
Power transformers are used in the power system to change the voltage levels to a level suitable for generation, or transmission or distribution. They are three-phase transformers, and can either be constructed as a single-unit or a bank of three single-phase units. In a hydro power station, a number of synchronous generators are used to generate electricity at 17.5 kV. The voltage is stepped up to 330 kV for transmission by parallel connected three-phase transformers. Each three-phase transformer consists of a bank of three single-phase units with each unit rated 100 MVA, 50 Hz, 330/17.5 kV. (a) With good reasons, explain the most suitable connection of the windings on the high-voltage side and the low-voltage side of each three-phase transformer, respectively. (b) What are the advantages of using a bank of single-phase transformers for each three-phase unit? (c) What are the disadvantages of using a bank of single-phase transformers for each three-phase unit?
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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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![QUESTION TWO
Power transformers are used in the power system to change the voltage levels to a level suitable for
generation, or transmission or distribution. They are three-phase transformers, and can either be
constructed as a single-unit or a bank of three single-phase units.
In a hydro power station, a number of synchronous generators are used to generate electricity at 17.5 kV.
The voltage is stepped up to 330 kV for transmission by parallel connected three-phase transformers. Each
three-phase transformer consists of a bank of three single-phase units with each unit rated 100 MVA 50 Hz,
330/17.5 kV.
(a) With good reasons, explain the most suitable connection of the windings on the high-voltage side and the
low-voltage side of each three-phase transformer, respectively.
(b) What are the advantages of using a bank of single-phase transformers for each three-phase unit?
(c) What are the disadvantages of using a bank of single-phase transformers for each three-phase unit?
(d) At a certain time, the load on one transformer (three-phase) was measured to be 200 MW at a power
factor of 0.8 lagging.
(1) Calculate the line current, and the phase current on the high-voltage side of the transformer.
(ii) Calculate the line current, and the phase current on the low-voltage side of the transformer.
(e) Due to fallure of one single-phase transformer, the two remaining single-phase trarsformers are
connected in open-delta (V-V). What is the maximum load that the V-V connected transformer can
supply without being over-loaded?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F5aea65da-032c-4646-ab74-c0eb3075ea35%2F454f444f-73f4-4fb0-b970-1015fb322ce6%2Fabyag7_processed.jpeg&w=3840&q=75)
Transcribed Image Text:QUESTION TWO
Power transformers are used in the power system to change the voltage levels to a level suitable for
generation, or transmission or distribution. They are three-phase transformers, and can either be
constructed as a single-unit or a bank of three single-phase units.
In a hydro power station, a number of synchronous generators are used to generate electricity at 17.5 kV.
The voltage is stepped up to 330 kV for transmission by parallel connected three-phase transformers. Each
three-phase transformer consists of a bank of three single-phase units with each unit rated 100 MVA 50 Hz,
330/17.5 kV.
(a) With good reasons, explain the most suitable connection of the windings on the high-voltage side and the
low-voltage side of each three-phase transformer, respectively.
(b) What are the advantages of using a bank of single-phase transformers for each three-phase unit?
(c) What are the disadvantages of using a bank of single-phase transformers for each three-phase unit?
(d) At a certain time, the load on one transformer (three-phase) was measured to be 200 MW at a power
factor of 0.8 lagging.
(1) Calculate the line current, and the phase current on the high-voltage side of the transformer.
(ii) Calculate the line current, and the phase current on the low-voltage side of the transformer.
(e) Due to fallure of one single-phase transformer, the two remaining single-phase trarsformers are
connected in open-delta (V-V). What is the maximum load that the V-V connected transformer can
supply without being over-loaded?
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