Multi-winding to suit specific needs & L.T. Transformers for generating
Stations. Upto 10 MVA ,3 Phase , Upto 33Kv , ONAN / ONAF / OFAF /OFWF
Cooling A power transformer characterized by inner and outer low voltage
winding sections and a high voltage winding section disposed there
between. The low voltage windings are comprised of a plurality of
pancake coils, and the high voltage winding are comprised of a plurality
of conductor strands spirally wound for a plurality of coil layers. The
low and high voltage winding sections are laterally spaced with the low
voltage windings disposed in side-by-side positions and adjacent to the
high voltage windings. The high voltage windings having a smaller turn
height than the low voltage windings and having conductor strands of
smaller gauge than the pancake coils of the low voltage windings.
The high reliability of these transformers ensures maximum availability,
lower maintenance costs and reduced life-cycle costs. Our ultimate goal
is to exceed our customers' expectations continually by delivering the
highest quality services. Power transformers comply with our quality
policy by:Consistent management focus on quality;Continually improving
the effectiveness of our Quality Management System;Understanding our
customers goals and embracing them.
A Power transformer is an electrical device that transfers energy
between two or more circuits through electromagnetic induction.
A varying current in the transformer's primary winding creates a
varying magnetic flux in the core and a varying magnetic field impinging
on the secondary winding. This varying magnetic field at the secondary
induces a varying electromotive force (EMF) or voltage in the secondary
winding. Making use of Faraday's Law in conjunction with high magnetic
permeability core properties, transformers can thus be designed to
efficiently change AC voltages from one voltage level to another within
Transformers range in size from RF transformers less than a cubic
centimeter in volume to units interconnecting the power grid weighing
hundreds of tons. A wide range of transformer designs is encountered in
electronic and electric power applications.
Generation of electrical power in low voltage level is very much cost
effective. Hence electrical power is generated in low voltage level.
Theoretically, this low voltage level power can be transmitted to the
receiving end. But if the voltage level of a power is increased,
the electric current of the power is reduced which causes reduction in
ohmic or I2R losses in the system, reduction in cross sectional area of
the conductor i.e. reduction in capital cost of the system and it also
improves the voltage regulation of the system. Because of these, low
level power must be stepped up for efficient electrical power
transmission. This is done by step up transformer at the sending side of
the power system network. As this high voltage power may not be
distributed to the consumers directly, this must be stepped down to the
desired level at the receiving end with the help of step down
transformer. These are the uses of electrical power transformer in
the electrical power system.
Two winding transformers are generally used where ratio between
high voltage and low voltage is greater than 2. It is cost effective to
use auto transformer where the ratio between high voltage and
low voltage is less than 2. Again three phase single unit transformer is
more cost effective than a bank of three single phase transformer unit
in a three phase system. But still it is preferable to use than the
later where power dealing is very large since such large size of three
phase single unit power transformer may not be easily transported from
manufacturer's place to work site.