The winding cab be of any type (i) spiral (ii)
crossover (iii) helical (iv) disc, designed
to withstand the optimum electrical, mechanical,
dynamic and thermal stresses depending upon
the current and voltage. The coils are wound
with electrolytic grade high conductivity, annealed
wire and strips covered with high quality insulation.
All coils are reinforced, insulated to withstand
the effect of short circuits and impulse voltage
shocks. Cooling ducts are provided to minimize
the hotspot temperature and temperature gradient
between winding and oil.
Insulation and Oil
The insulation material like pre-compressed
boards, blocks, corrugated cylinders, Bakelite
tube, insulating tapes, empire sleeves, glass
sleeves varnish, epoxy bushing, porcelain bushing
etc. are used of best quality to ensure long
life to the transformers. Oil used as a coolant
and insulating medium is of the best quality
conforming to IS: 335. Before filling into Filtration
Plant’ and tested to ensure free from
moisture and dust.
Tank and Radiator
The tanks are made from premium quality mild
steel sheets, plates and pipes by electrical
welding. Proper bracing and stiffeners are provided
for robust construction. The tank are tested
at specific pressure for leakage at joints/welds.
Sufficient cooling radiators are provided for
maximum dissipation of heat during extreme ambient
temperatures. The radiators are made from best
grade pressed steel fins or elliptical tubes.
Tank surface exposed to atmosphere is painted
with two coats of red oxide paint to provide
maximum resistance to corrosion and two coats
of epoxy based anti-corrosive enamel paint.
Surface in contact with oil is treated with
two coats of ‘Oil and Heat Resistant Paint’.
This paint has more effective resistance compared
to ordinary enamel paint against corrosion and
Various vector groups can be provided as per
Our transformers are designed for maximum temperature
rise at full rated load 40 degree c/50 degree
c for oil/winding for aluminium wound transformers
and 45 degree C/55 degree C for copper wound
Our transformers are designed for overloading
excess than normal rating as per IS:6600.
Fitting and Accessories
Standard fitting recommended in IS 2026-1977
are provided. Extra fittings like buchholzrelay,
dial type thermometer, winding temperature indicator,
marshalling box, H.V. & I.V. cable boxes,
PRV and OSP are provided as per the requirement
of the customers.