(57) An onload tap-changing transformer comprises a high voltage winding (2) a low voltage
winding (1) wound on an iron core (C) a coarse tap winding (3) wound on the iron core
and connected in series with the high voltage winding, and a fine tap winding (4)
wound on the iron core and selectively connectable to the high voltage winding or
the low voltage winding by a switch (S). The conductors making up the coarse tap winding
and the conductors making up the fine tap winding are wound together, in juxtaposed
relation with each other, into at least one integrated disc winding assembly and taps
are led out of predetermined points of the fine tap winding, thereby inceasing the
capacitance between the coarse tap winding and the fine tap winding so that the transfer
voltage generated upon application of a lightning impulse and the potential difference
between the windings are reduced, thus preventing any corona or dielectric breakdown.
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