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1. (WO2009130210) ARC DETECTOR AND ASSOCIATED METHOD FOR DETECTING UNDESIRED ARCS

Pub. No.:    WO/2009/130210    International Application No.:    PCT/EP2009/054727
Publication Date: Oct 29, 2009 International Filing Date: Apr 21, 2009
IPC: H02H 1/00
H02H 7/055
Applicants: ABB RESEARCH LTD
ERIKSSON, Thomas
HALÈN, Stefan
HEDBERG, Jonas
Inventors: ERIKSSON, Thomas
HALÈN, Stefan
HEDBERG, Jonas
Title: ARC DETECTOR AND ASSOCIATED METHOD FOR DETECTING UNDESIRED ARCS
Abstract:
It is presented an arc detector for detecting undesired arcs. The arc detector comprises: an antenna for receiving an electromagnetic signal representing an arc; and a discriminator for analysing a signal from the antenna, the discriminator comprising a spectrum analyser arranged to detect whether the signal represents a normal arc or an undesired arc. The discriminator is arranged to detect whether the signal represents a normal arc or an undesired arc by comparing signal levels at frequencies of a spectrum of the signal corresponding to at least one partial reference spectrum, and determining the arc to be a normal arc if a deviation from the reference spectrum is less than a threshold deviation. A corresponding method is also presented.