TBS 250A
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FEATURES Bushing for outdoor applications in oil insulated transformers. This bushing has an epoxy resin core that ensures good mechanical performances and excellent insulation level. The external coating consists of liquid silicone rubber co-moulded on the core that guarantees excellent resistance to degradation caused by atmospheric agents (sandstorms, UV radiations, saline enviroment, industrial pollution...). The insulator is provided with an aluminium flange for fixing to no°4 M10 studs of the transformer carpentry. The electric field inside the insulator is controlled by a metal shield. This shield must normally be connected to earth by means of the cable pre-mounted on the isolator, but it can be used to pick up a voltage presence signal, using a special kit supplied separately only on request. Every bushing is supplied with:       Nickel-plated brass nuts and washers for air side connection (M12) Nuts and washers in brass for the oil side connection (M12) Cork rubber seal Screen grounding set Nickel-plated brass cap, prepared for anchoring spark-gap horns Nuts and washers (flat and split) in stainless steel for fixing to the transformer studs (M10) ROUTINE TESTS • Visual and dimensional check • Glass transition temperature • Dry power frequency withstand voltage test • Partial discharges • Dry lightning impulse withstand voltage • Bending stress test • Temperature rise test • Wet power frequency withstand voltage Lightning impulse voltage withstand Power frequency voltage withstand  good impact and shock resistance  easy and quick assembly  100% guaranteed partial discharges  NO OIL IN THE BUSHING BODY = reduced possibility of loss and consequent fire  low need of periodic cleaning Nominal current MAINTENANCE FREE !