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7.9 Types of Three-Phase Transformers
7.9 Types of Three-Phase Transformers
Similarly in a three-phase transformer we also mainly find: Core, Low Voltage windings, main channel, High Voltage winding. Depending on the design features, the three-phase transformer can have three independent magnetic cores (Fig. 7.22).
Fig. 7.22 Transformer power bank. Source: Own elaboration
Other types of three-phase transformers use a single magnetic core to reduce magnetic core, reducing weight among others (Fig. 7.23).
Fig. 7.23 Three-phase core transformer. Source: From wikicommons under free to use license [18]
We can arrange a three-phase transformer, using the same components: the core, primary, and secondary windings, and insulation, but with different design (Fig. 7.24).
Fig. 7.24 Three-phase and single core transformer. Source: From wikicommons under free to use license [19]
By making the star or delta connections to the primary and secondary electrical windings, we obtain a three-phase transformer. To build the bench, three identical single-phase transformers must be used.
The main advantage of a three-phase core transformer is economical. It is important to highlight that a single housing must enclose all magnetic cores. Therefore, if we use three different housings for three single-phase transformers, we employ more iron if we only use one that contains a three-phase transformer (even if it has a larger size). The disadvantage lies in having a spare unit for replacement in case of failure. This is because it is much cheaper to have a spare fourth single-phase transformer than to duplicate a three-phase transformer.
练习题
Which of the following are the main components found in a three-phase transformer?
What is the primary advantage of using a single magnetic core in a three-phase transformer compared to using three independent magnetic cores?
Which of the following statements correctly describe the economic aspects of three-phase core transformers? (Select all that apply)
Star or delta connections to the primary and secondary electrical windings are used to obtain a three-phase transformer configuration.
To build a transformer bench, four identical single-phase transformers must be used.
Using three different housings for three single-phase transformers requires more iron than using a single larger housing that contains a three-phase transformer.
The main disadvantage of a three-phase transformer compared to a bank of single-phase transformers lies in having a ___ unit for replacement in case of failure.
A three-phase transformer can be arranged using the same components as a single-phase transformer: the core, primary and secondary windings, and ___, but with different design.
Explain why having a spare single-phase transformer is more economical than having a spare three-phase transformer for replacement purposes.
Describe how using a single magnetic core in a three-phase transformer affects iron losses compared to using three independent magnetic cores in a transformer bank.
A three-phase core transformer uses a single magnetic core design instead of three independent magnetic cores. Given that iron losses are expressed as , what is a primary advantage of this single-core design?
A transformer bank consisting of three identical single-phase transformers requires more iron material than a single three-phase core transformer of equivalent power rating, which would result in higher total iron losses since depends on the iron volume and flux density.
Which of the following statements correctly describe the trade-offs between a three-phase core transformer and a transformer bank of three single-phase transformers?
Explain how the design choice between a three-phase core transformer and a transformer bank of three single-phase transformers affects both the initial cost and the cost of maintaining spare units for replacement during the transformer's rated operating life.
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