Surge arrester
First Claim
Patent Images
1. A surge arrester comprising:
- (a) a stack of a plurality of cylindrical varistor blocks of metal oxide, said varistor blocks being arranged end-to-end in their axial direction between two end electrodes;
(b) an elongated, electrically-insulating outer casing of rubber or other polymeric material surrounding said stack;
(c) at least one compression member of insulating material interconnecting said end electrodes for providing contact pressure between said varistor blocks and said end electrodes; and
(d) a bursting-preventive bandage radially surrounding said varistor stack, said bandage consisting of a continuously wound insulating fibre embedded in thermosetting resin and having openings for pressure relief in case of internal short circuit in the surge arrester.
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Abstract
A surge arrester includes a stack of varistor blocks (10), for example of zinc oxide, arranged between two end electrodes (11, 12) in an elongated insulating casing (23) of polymeric material, for example silicone rubber. The varistor blocks and the electrodes are axially surrounded by compression loops (14-17) of insulating material for providing the necessary contact pressure between the different elements (10, 11, 12) in the varistor stack. The varistor stack (10) and the compression loops are radially surrounded by a bursting-preventive bandage (21) of insulating material with openings (22) for pressure relief in case of internal short circuit in the surge arrester.
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11 Claims
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1. A surge arrester comprising:
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(a) a stack of a plurality of cylindrical varistor blocks of metal oxide, said varistor blocks being arranged end-to-end in their axial direction between two end electrodes; (b) an elongated, electrically-insulating outer casing of rubber or other polymeric material surrounding said stack; (c) at least one compression member of insulating material interconnecting said end electrodes for providing contact pressure between said varistor blocks and said end electrodes; and (d) a bursting-preventive bandage radially surrounding said varistor stack, said bandage consisting of a continuously wound insulating fibre embedded in thermosetting resin and having openings for pressure relief in case of internal short circuit in the surge arrester. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification