The power range of transformers have many and varied applications, some of which
include ground and pole mounted transformers for rural electrification projects, power
distribution to industrial, commercial and housing developments, also industrial supply
transformers for furnaces, mining and computer installations.
Construction across the whole range is based on a core of interleaved, cold rolled,
grain orientated steel laminations, securely held between top and bottom clamps, by means
of clamping bolts and tie rods. This serves a dual purpose of securing the windings in
place, and of transferring the load from the bottom to the top clamps when the core and
windings are lifted.
The transformer windings are designed to meet mechanical, thermal, and electrical
requirements. Windings are wound with either paper covered or synthetic varnish covered
copper wire, insulation between layers, windings and earth screen is based upon the flash
withstand test level as indicated by BS 171 (IEC 76) and BS EN 60076 part 1 & 2 1997.
The core and windings are then baked in an oven to drive out any moisture and varnish
vacuum impregnated in class "H" varnish, and replaced in the oven until the
varnish has baked hard.
A choice of terminations are then available depending upon customers' requirements and
practical practices. The enclosures if required are manufactured in house from mild sheet
steel and come complete with detachable plates or conduit entries, lifting lugs or
eyebolts, and base mounted channels for anchoring to the floor. Other equipment can be
fitted if requested by the customer i.e. volt and ammeters, switches, circuit breakers
etc. Before dispatch all transformers are submitted to routine tests as specified in BS
171 (IEC 76) and BS EN 60076 part 1 & 2 1997.
