Transformer Bushings & Terminations
Standards: IEC 60137, IEEE C57.19
Oil-impregnated paper or resin bushings for HV/LV line connections, terminal plates and cable boxes up to and beyond 550 kV.
HV Porcelain Bushings
Oil-impregnated paper or resin bushings for 36–550 kV line connections.
LV Bushings
DIN-type porcelain or epoxy bushings, 1–3.6 kV, up to several kA.
Plug-in / Elbow Bushings
Dead-break separable connectors for compact and RMU-fed transformers.
Epoxy Monoblocks & Terminal Plates
Cast-resin multi-terminal blocks for distribution transformers.
Cable Boxes & Glands
Air- or oil-filled boxes terminating MV/LV cables at the tank.
Surge Arresters
Metal-oxide arresters, 12–420 kV, protecting windings from surges.
Frequently asked
Oil-impregnated-paper (OIP) bushings use a vacuum-dried paper core impregnated with oil; resin-impregnated-paper (RIP) bushings use resin-impregnated paper with no free oil, making them a common, more compact choice for sealed and GIS applications.
By rated voltage and BIL (impulse withstand), rated current, creepage/pollution class, installation orientation, altitude derating and PD limits — and by compatibility with the fluid or gas above and below the bushing.
Capacitance and tan-delta (dissipation factor) drift are early signs of moisture or contamination, so monitoring taps let operators catch problems before failure.
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