Trafo Daya tiga Fase

Based upon advanced technologies introduced from abroad and the successful experiences of leading manufacturers both domestic and abroad,the carefully made 110kV transformer series, being energy saving and
environmentally friendly, comply entirely with up-to-date National standard GB1094.1~5 and International standard IEC60076, and are proud of the following outstanding features:
Low loss, therefore significantly energy-saving. The average no-load loss is 35%
lower, and the load loss 10~20% lower, than prescribed by the present National standard
GB/T 6451.
The core laminations are made up from imported high-quality cold-rolled
grain-oriented silicon steel sheets with miter joints and without punched holes, and are
stacked without the upper yoke sheets in place. After stacking, the core is pressed
integrally and finally glued together by epoxy resin on the cut edges, so that the three
limbs and the upper and lower yokes are bonded together into a rigid, vertically
straightened entity, together with the plate-type upper and lower frame.
Zigzag directed flow of oil are provided within the windings, so that all parts of the
windings can be cooled more evenly, thus reducing the temperature rise of the windings as
a whole as well as the hot-spot temperature rise, prolonging the service life of
transformers.
The regulating winding is a separate winding, apart from the high voltage main
winding. In this way, total ampere-turn balance between windings can be obtained
irrespective of the tapping position; and the axial electrodynamic force during short circuit
can be much reduced, thus upgrading the short circuit withstand capability of the
transformer as a whole. All the windings are perfectly dried before assembly. The radial
clearances between windings and between low voltage winding and core are filled with
pre-dried vertical spacers and insulating cylinders in such a way that the windings are
tightly together radially with practically 'zero' allowance between them.
The windings of one phase are assembled into an integral phase block before placing
onto the core. The low voltage winding is wound directly on strong thick paper cylinder.
Vertical spacer strips are provided in spaces between windings and outside the outermost
winding. The radial dimensions of all windings are kept within strict tolerance, so that a
rigid winding phase block are obtained, capable of withstanding all the radial short-circuit
forces encountered in service, and the possibility of buckling of the inner winding is
obviated. Axially, the height of all windings is kept within close tolerance. Horizontal
spacers between discs of a winding are pre-densified. The assembled winding phase black
are pressed up and down by single support and pressure plates after careful adjustment of
the heights of individual windings. Axial pressures are co-ordinated with the calculated
short circuit force, so that the capability of the transformer to withstand axial short-circuit
force is much increased.