SHORT CIRCUIT CAPABILITY
In
Order to reverent deformation under short-circuit forces,
solid insulator end blocks and rings are used. Windings are
compressed under top and bottom clamping members with the help
of tie rods. The axial end thrust under fault condition is
minimized by the suitable balance to the ampere-turns over the
length of windings. In case of bigger transformers, the HV
taping leads are taken out from two positions to balance the
short circuit forces in a much better way. At tesla each and
every component used in transformer undergoes a series of
stringent checks and controls at each stage of manufacturing
and it is ensured that strict technical & qualitative
specifications are adhered to. Utmost care is taken while
manufacturing and assembling every component of a transformer.
The main process line of a transformer is:
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CORE: The
core is constructed from lamination of imported cold rolled , grain oriented
, low loss electrical steel . The cores are assembled in jigs prior
to tapping and clamping in a manner that reduces vibration and
inherent varnish, which is both oil and heat resistant and complete core, is
connected to the clamps to ensure that it is effectively earthen.The core legs are
surely bound with heavy duty insulating tape and the yokes are firmly
clamped between folded steel channels. Tops & bottoms clamps are
secured to each other by means of tie rods, which serve the dual purpose
of securing the windings in the place and of transferring the load form
the bottom to the top, clamps when the core and windings are lifted. This
prevents any tensile stress being setup in the core legs, which could
adversely affect the iron losses.
WINDING:
Transformers windings, or Coils are designed to meet three
fundamental requirements, mechanical;, Thermal & electrical;. .
They are cylindrical in shape and are wound concentrically. Both
H.V.& L.V. windings are wounds with adequate brazing and
securing tapes in order to achieve a strong and self-supporting
structure. Inter layer ducts are provided to ensure low temperature
gradient between windings and oils and thus any hot spot temperature
is kept to minimum. This insures that the rate of insulation
deterioration is minimized and high life expectancy is
achieved.
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