Surge voltage protector for use in power transmission networks
AssigneeSiemens Aktiengesellschaft
InventorsBernd Kruska, Kai Steinfeld
Life of this patent
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Abstract
The invention relates to a surge voltage protector (1) which comprises a discharge current path with at least one varistor block (4a, 4b, 4c). In order to prevent the varistor blocks (4a, 4b, 4c) from bursting when an inner error is produced and an electric arc connected thereto is created, a coating (9, 9a, 9b, 9c) is applied in the region of the outer covering area of at least one varistor block (4a, 4b, 4c), said coating being made of a substance which triggers an electric flashover when a critical temperature of the varistor blocks (4a, 4b, 4c) is exceeded.
Claims7
A surge arrester for use in electrical power transmission systems, comprising:
- a discharge current path which has at least one varistor block, the varistor block having two contact regions and a casing region, wherein a coating, which serves to initiate an electric flashover in event of a critical temperature of the varistor block being exceeded, is arranged in at least one part region of the casing region of the at least one varistor block.
Dependencies are inferred from the claim text.