Why is it preferred to use circular coils and stepped core in design of transformer?

Due to less diameter of circumcircle, the insulating material required is less. -Length per one turn is less so that amout of copper required for winding can be reduced. -Due to above reasons size, weight and cost of transformer is less with cruciform core.

What is cruciform core and reason behind it?

[′krü·sə‚fȯrm ‚kȯr] (electricity) A transformer core in which all windings are on one center leg, and four additional legs arranged in the form of a cross serve as return paths for magnetic flux.

What are the design steps for a transformer?

1. Step 1: Core Choice. Make your preliminary core choice based upon the power requirements of the application, the switching topology, and the frequency.
2. Step 2: Volt-Time Product (V-µSec) Value.
3. Step 3: Primary Turns.
4. Step 4: Turns Ratio.
5. Step 5: Secondary Turns.
6. Step 6: Primary Inductance.
7. Step 7: Air Gap.
8. Step 8: Wire Size.

What is the purpose of providing an iron core in transformer?

The purpose of the iron core is to channel the magnetic flux generated by the current flowing around the primary coil, so that as much of it as possible also links the secondary coil.

What is the significance of using cruciform in transformer core?

Cruciform shape is used in transformer core to reduce core loss, copper, in the winding, reduce core reluctance, and reduction of iron and copper losses. In a transformer, eddy current losses in the iron core are directly proportional to the core’s thickness.

What are the advantages of square core over rectangular core?

The diameter of the circumscribing circle for square / rectangular coil is larger than the diameter of stepped core of same area of cross section therefore the length of mean turns of winding is reduced in the stepped core.

Which of the following is not the purpose of iron core in a step up transformer?

4. Which of the following is not the purpose of iron core in a step-up transformer? Explanation: Helical winding is used for low voltage and high current winding of large generator transformers.

What is the main purpose of choosing stepped core transformer?

Main purpose for choosing stepped core, while designing a transformer is to reduce the amount of copper being used in windings. When we use stepped core,the copper being used in the windings can be minimized,hence overall copper loss is also minimized.

Which coil is suitable for small and low voltage transformers?

The rectangular coil is suitable for small and low voltage transformers. Why the stepped core is used in place of square core in the large rating transformer?

What happens if the diameter of the core of a transformer decreases?

On the other hand, if diameter of the core is decreased, the weight of the steel in the core is reduced; which leads to less core loss of transformer, but in the same time, this leads to increase in number of turns in the winding, means increase in copper weight, which leads to extra copper loss in transformer.

What is the difference between circular coil and rectangular coil transformer?

Generally the circular coils are preferred for distribution transformer whereas the square and stepped cores are preferred for power transformer. The cross section of the core may be rectangular for shell type transformer. The rectangular coil is suitable for small and low voltage transformers.