CP TD1 Reference Manual V 1.44
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Oil-filled
A bushing where the space between the major insulation or the conductor, and
the inside surface of a protective weather casing is filled with insulating oil.
Oil-immersed
A bushing composed of major insulators that are totally immersed in a bath of
insulating oil.
Oil-impregnated paper-insulated
A bushing where the internal structure is made of cellulose material impregnated
with oil.
Resin-bonded paper-insulated
A bushing where cellulose material bonded with resin provides the major
insulation.
Solid, ceramic
A bushing where a ceramic or other similar material provides the major
insulation.
Gas insulated
A bushing that contains compressed gas like SF6 or mixtures of SF6 with other
gasses i.e. N2. This type is frequently used for circuit breaker bushings.
7.3 Bushing Troubles
About 90 percent of all preventable bushing failures are caused by moisture
entering the bushing through leaky gaskets or other openings. Periodic
inspection and diagnostic measurements can prevent most outages due to
bushing failures. High-voltage bushings may explode with considerable violence
and cause extensive damages to adjacent equipment. Flashovers may be
caused by deposits of dirt on the bushings, particularly in areas where there are
contaminants such as salts or conducting dusts in the air. These deposits should
be removed by periodic cleaning. In [4.3] bushings faults, possible reasons and
methods of detection are explained (Table 7-1).
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