Abb Research Ltd.

Abb Technology Ag

Abb Schweiz Ag

Bernhard Doser

Felix Greuter

Daniel Müller

Peter Dubach

Lars Liljestrand

Walter Schmidt

Elisabeth Lindell

Daniel Neeser

Jakob Rhyner

Dieter Fuechsle

Josef Lehmann

Lutz Gebhardt

Marlene Ljuslinder

Nils Weiss

Denis Buergi

Ate Postma

A multi-terminal surge arrester which includes an active part extending along a longitudinal direction of the surge arrester, a first electrode resting against a first end of the active part, and a second electrode resting against a second end of the active part, which second end opposes the first end in the longitudinal direction of the surge arrester. The surge arrester further includes an insulating fixing device mechanically connecting and fixing the first electrode and the second electrode, and an insulating housing arranged around the active part. The active part includes at least two metal-oxide based varistor elements and a further electrode arranged between the at least two varistor elements, which further electrode provides an externally accessible electrical connection. Therein, the surge arrester is adapted for being insulated by surrounding air.

Multi-terminal surge arrester

Exemplary embodiments are directed to a device with overvoltage protection that includes a varistor which can be connected by a first connection via a first line to high-voltage potential in a circuit arrangement, while a second connection is connected to ground via a second line. Furthermore, an additional impedance is provided, which can be connected between the second connection and ground or the first connection and the high voltage, or is mounted fixed in this position. The corresponding line can be interrupted by a switching arrangement. In order to test the withstand voltage of the circuit arrangement, at least one of the first and second line is interrupted and an additional impedance is inserted. A test voltage is applied to the circuit arrangement. After the overvoltage test, the interruption in at least one of the first and second lines is removed again.

Device with overvoltage protection and method for its testing

An exemplary surge arrester includes a housing with protection against electric shock. A voltage-limiting active part is arranged in the housing and has a stack of varistor elements formed as a varistor column. An electrical connection is arranged outside the housing and is electrically conductively connected to the varistor column for connecting a high-voltage installation. The electrically conductive connection between the varistor column and the electrical connection is a flexible high-voltage cable conductor. The high-voltage cable has a first section arranged in the interior of the housing and formed without a shield, and a second section arranged outside the housing and having cable insulation and an electrically conductive shield that surrounds the cable conductor. The high voltage cable is electrically conductively connectable first to the housing and second to an encapsulation. The housing accommodates an apparatus for damping oscillations which are introduced into the varistor column from the outside.

Surge arrester

The surge arrester contains a tubular encapsulation () of electrically conductive material that is filled with an insulating gas, an insulator () that is held on the encapsulation () and serves for supporting a current conductor (R) that is connected to a high voltage, an active part (R) that is arranged in the encapsulation () and comprises at least one varistor column () that is aligned along the encapsulation axis (A) and a field control element (). In order to maintain the manufacturing costs of this arrester at a low level, the field control element () and a first plug-type contact () of a plug connection () are held on the current conductor (R) of the insulator (), and a high-voltage electrode () of the varistor column () that is connected in an electrically conductive fashion to the current conductor (R) via the plug connection () contains the second plug-type contact () of the plug connection ().

Gas-insulated surge arrester

The invention relates to a simplified and cost-effective apparatus for injecting signals into electrical power lines at the high-voltage or medium-voltage level. A coupling unit which is simple to assemble and is protected against direct contact is proposed, in which the connecting cable,is integrated in the housing,of the coupling capacitor,In the region where the conductor,passes through the grounded housing,of the coupling capacitor,the electrical field is reduced by means of the housing wall having a special shape,A smooth field distribution is achieved by suitable rounding of the formed region,which is provided for the insertion of the connecting cable

Coupling capacitor having an integrated connecting cable

Growing community of inventors

Waldshut-Tiengen, Germany

Bernhard Doser