Abstract

The moving contact is moved by the switchgear mechanism during a switching operation, to form a gap of between 6mm and 24mm depending on the interrupter and system voltage. Currently vacuum interrupter designs use a range of arc control systems ranging from no arc control – (diffuse arc system for low currents), to a number of Radial Magnetic Field (RMF) systems, and Axial Magnetic Field (AMF) systems using both internal and external methods of generating the necessary magnetic fields. In addition today a range of contact materials are used to provide the optimum interrupter performance. This performance can be significantly changed by using a different contact material, a subject which will be discussed later.

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