Core Construction
Transformers employ basically two types of core construction techniques.
Core type: In core-type construction, the transformer winding surrounds the laminated core. The coils can be cylindrical, flat, or disk shaped. They can be arranged to fit around the rectangle or square cross section of the core, as shown in Figure 5.1. Core-type construction provides a single-path magnetic circuit through the magnetic core. Most small distribution transformers are of this construction.
Shell type: In shell-type construction, the magnetic core surrounds the wind- ings, as shown in Figure 5.2. The primary and secondary windings may be interspaced side by side or circularly stacked one above the other. Some large power transformers have this form of construction. One advantage of the shell type is that it offers a separate path for the zero-sequence currents through the core, as compared to the core type in which the zero-sequence path exists only through the transformer tank and end connections.
Core Construction
Transformers employ basically two types of core construction techniques.
Core type: In core-type construction, the transformer winding surrounds the laminated core. The coils can be cylindrical, flat, or disk shaped. They can be arranged to fit around the rectangle or square cross section of the core, as shown in Figure 5.1. Core-type construction provides a single-path magnetic circuit through the magnetic core. Most small distribution transformers are of this construction.
Shell type: In shell-type construction, the magnetic core surrounds the wind- ings, as shown in Figure 5.2. The primary and secondary windings may be interspaced side by side or circularly stacked one above the other. Some large power transformers have this form of construction. One advantage of the shell type is that it offers a separate path for the zero-sequence currents through the core, as compared to the core type in which the zero-sequence path exists only through the transformer tank and end connections.
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