Surge voltage protector for use in power transmission systems

摘要

The invention relates to a surge voltage protector ( 1 ) which comprises a discharge current path with at least one varistor block ( 4 a, 4 b, 4 c). In order to prevent the varistor blocks ( 4 a, 4 b, 4 c) from bursting when an inner error is produced and an electric arc connected thereto is created, a coating ( 9, 9 a, 9 b, 9 c) is applied in the region of the outer covering area of at least one varistor block ( 4 a, 4 b, 4 c), said coating being made of a substance which triggers an electric flashover when a critical temperature of the varistor blocks ( 4 a, 4 b, 4 c) is exceeded.