What is the cruciform core?

[′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 is the magnetic core in transformer?

A magnetic core is a piece of magnetic material with a high magnetic permeability used to confine and guide magnetic fields in electrical, electromechanical and magnetic devices such as electromagnets, transformers, electric motors, generators, inductors, magnetic recording heads, and magnetic assemblies.

What are the advantages of stepped core?

Stepped cores in transformer are used to reduce iron in core , copper in winding , better utilization of magnetic field and reduction of iron and copper losses . Eddy current losses in iron core are proportionate to thickness of core or a conductor .

What is spiral core transformer?

The spiral core transformer is a type of transformer which employs the newest development in core construction. The core is assembled of a continuous strip or ribbon of transformer steel wound in the form of a circular or elliptical cylinder. Such construction allows the core flux to follow the grain of the iron.

What is a cruciform shape?

Cruciform is a term for physical manifestations resembling a common cross or Christian cross. The label can be extended to architectural shapes, biology, art, and design.

What are the disadvantages of stepped core?

What are the disadvantages of stepped cores? With large number of steps a large number of different sizes of laminations have to be used. This results in higher labor charges for shearing and assembling different types of laminations.

Which are the advantages of amorphous core transformer?

Advantages of Amorphous Metal Transformers (AMT) Lower no-load loss. As the no-load loss is lower, the temperature rise of transformer is lower. Better harmonic wave tolerances. Potential for lower total cost of ownership.

What are the different types of core in transformer?

Usually, these two coils are subdivided into several coils in order to reduce the creation of flux. Core – The transformer core is used to provide a controlled path for the magnetic flux generated in the transformer.

What is core and shell type transformer?

In core type transformer both the primary and the secondary windings are placed on the side limbs whereas, in shell type transformer, the windings are placed on the central limbs of the transformer. The core type transformer has two magnetic circuits whereas the shell type transformer has one magnetic circuit.

What is the difference between stepped core transformer and cruciform transformer?

A cruciform core uses two stepped core, while as the transformer size increases more number of steps are used which reduces length of mean turn and consequently I 2 R losses. But stepped construction needs extra cost as different size laminations as required, also time and labour required for assembly increases.

What are the advantages of using a cruciform core?

Though the cost of manufacturing of such a cruciform core is much greater, but the circular coils that are used are easier to wind and provide more mechanical strength, especially when short-circuit occurs. Other advantages of using cruciform core are,high space factor and reduced mean length of turns resulting in reduced copper loss.

Which type of core is used in shell type transformer?

In shell type transformer usually simple rectangular core is used. It is common practice to increase yoke cross section by 15 to 20 percent than that of the limb area of transformer which uses hot rolled steel.

What type of transformer coils are used in Transformers?

Core type Transformers: The coils used are form-wound and are of the cylindrical type. The general form of these coils may be circular or oval or rectangular. In small size core type transformers, a simple rectangular core is used with cylindrical coils which are either circular or rectangular in form.