What is a shell transformer
Three-phase transformer structure
A three-phase transformer is used to transmit a large amount of power. The three-phase transformer is required to build up and reduce the voltages at different stages of a network. The three-phase transformer is constructed in two ways.
- Three separate single-phase transformers are suitably connected for three-phase operation.
- A single three-phase transformer that combines the cores and windings of all three phases into a single structure.
The three single-phase transformers can be used as a three-phase transformer if their primary and secondary windings are connected together. The three-phase transformer supply has many advantages compared to three single-phase units as it takes up very little space and is also much smaller, smaller and cheaper. The three-phase transformer is mainly classified into two types; H. The core type transformer and the shell type transformer.
Core type three phase transformer
Imagine a three phase core type transformer at an angle of 120 ° to each other as shown in the figure below. When the balanced three-phase sinusoidal voltages are applied to the windings, the fluxes are φaφb and φc So wants to be sinusoidal and balanced. When the three legs that carry these rivers are combined, the total flow in the merged leg becomes zero. This leg can therefore be removed as it does not contain any river. This structure is not suitable for the core.
Shell-type three-phase transformer
The shell type 3-phase transformer can be constructed by stacking three single-phase shell transformers as shown in the following figure. The winding direction of the central unit b is opposite to that of the units a and c. When the system is aligned with the phase sequence a-b-c, the flow is also balanced
So see; Three transformer connections.
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