Over-voltage limiter for transformer

摘要

An over-voltage limiting device includes a voltage dependent resistor (1) connected in parallel with at least one part-winding (14) of a transformer. The voltage dependent resistor (1) is formed of a number of mutually-abutting resistance discs (20) in part-stacks (2-5), arranged approx. as rings. More specifically, the number of part-stacks equals or exceeds three, with each part-stack designed as at least two ZnO-elements as resistance disks (20).