Patent ID: 7369390
Filing Date: 2008-05-06
Classification: H01C

Abstract:
1. A gas-insulated surge arrester, comprising an encapsulation of electrically conductive material that is filled with an insulating gas and aligned along an encapsulation axis, an insulator that is held on the encapsulation and serves for supporting at least one current conductor that can be connected to high voltage, at least a varistor column which is arranged in the encapsulation, is fixed on a mounting plate of the encapsulation, is aligned along the encapsulation axis, and comprises a pre-assembled unit with varistor characteristics having at least two electrodes and a first stack of varistors that is arranged between the two electrodes, as well as at least a first loop-shaped clamp that is supported on the two electrodes and that clamps together the first varistor stack, and a field control element which is electrically connected to the at least one current conductor and which is extended into a space arranged between the first stack of varistors and the encapsulation, wherein the field control element and a first plug-type contact of a plug connection are held on the current conductor of the insulator, wherein a high-voltage electrode of the varistor column that is connected in an electrically conductive fashion to the current conductor via the plug connection contains a second plug-type contact of the plug connection, and wherein the plug connection is configured such that an expansion of the varistor column during operation is compensated by a sliding movement of the second plug-type contact.