A HIGH VOLTAGE FIBRE REINFORCED BUSHING HAVING A LENGTHWISE WEAKENING ENSURING CONTROLLED RUPTURE AT INTERNAL OVERPRESSURE

摘要

The present invention relates to an insulator unit for a high voltage apparatus. The insulator unit comprises a tubular part (2b) made of composite material including fibers arranged in at least two different directions, and two end fittings (3a-b) connected to the tubular part. The tubular part and the end fittings form an enclosure for enclosing a voltage carrying part and a medium for insulating the voltage carrying part. The tubular part comprises an intermediate section (12b) provided with at least one weakening (40) arranged along the length of the intermediate section. The tubular part is designed to be able to withstand a specified type test pressure and to rupture at a certain overpressure above the specified type test pressure.