Choosing correct coils for transformer

Energy efficient transformer manufacturers in India, Rajasthan Powergen use as rectangular and elliptical coils as they work for certain standard applications and their construction requires high volume manufacturing processes.

Rectangular windings will suit your demand if you have a standard distribution transformer which is subjected to limited available fault currents and is equipped with protection devices, subject to stable loading with little or no variation, or is a small to medium sized transformer with star connected primary and secondary winding.

Round coil design will work when the transformer is "exposed" to higher levels of fault currents, repeated events, high current requirements with lower designed disturbances like motor starting. You should then buy a round coil design with a layer wound and one with robust bracing encompassing heavy duty pressure plates as they add axial stability to balance the strong physical forces which are experienced during faults.

Round cores utilise miter cut, cruciform cores while wound cores are used with rectangular or elliptical coils. Cruciform cores comprise of multiple width laminations which present a round cross-section and largely fill the core window in the round coils when assembled. Round coils with a cruciform core give superior resistance to radial forces to which the transformer is subjected during faults and severe duty cycles.

The round coil construction has improved cooling which helps dissipate short circuit thermal effects after the fault has cleared and the transformer resumes normal loading. The improved cooling is a result of round coil construction as unlike wound cores, cruciform cores together with specially designed upper and lower pressure plates let the cooling fluid to flow throughout the coils thereby reducing hot spots in the insulation system, which in turn leads to longer transformer shelf life. The use of latest and modern technologies in the manufacturing of transformers allows to attain the high quality standards.

When you plan to purchase larger transformers like 10 MVA and above, or higher BIL levels, 350 kV BIL and above, you should also take into account buying disc-wound, round coils. The disc-wound design has all the benefits of layer wound round coils with miter cut cruciform cores with additional and mechanical strength and transient fault withstand capability.

In addition to this, disc construction reduces electrical stresses within the coil which is caused by switching surges, lightening strikes, and voltage disturbances which frequently occur in the network at higher voltage levels and seen by larger transformers.

The energy efficient transformer manufacturers in India, Rajasthan Powergen prefer round coil design as it is best suited for most substation applications, all station transformer applications, and for high-risk distribution transformer applications with an overall lower total cost of ownership. Buy the desired transformer for all your needs from the leading transformer manufacturer in India, Rajasthan Powergen. The company offers energy efficient, low losses transformers that are eco-friendly, shock proof, free from humming sound and has several other useful features. Rajasthan Powergen offers wide range of transformers to meet the growing demands of energy all over the world.