Patent ID: 7005863
Filing Date: 2006-02-28
Classification: H02H

Abstract:
1. A device for monitoring a surge arrester connected to a power network producing an electric field, comprising a registering unit and means for attachment of the registering unit to the surge arrester, the registering unit comprising a grounding line, which is connected or intended to be connected to ground and which is intended to be conductingly connected with the surge arrester when the registering unit is attached to the surge arrester so that a current flowing through the surge arrester will pass through this grounding line, means for registration of a current passing through the grounding line from the surge arrester, a member for registration, based on the registrations of the current passing through the grounding line from the surge arrester, of current pulses passing through the surge arrester, and a storage member for storing data concerning the current passing through the grounding line from the surge arrester and data concerning registered current pulses, wherein the registering unit further comprises a field probe being charged in response to the electric field produced by the network and being connected to ground, the field probe is adapted to generate a current in response to the electric field, a sensor for registration of the current flowing between the field probe and ground, the storage member being adapted to store data concerning the current flowing between the field probe and ground, and a time meter, the storage member being adapted to store the data concerning the current passing through the grounding line from the surge arrester and the data concerning the current flowing between the field probe and ground associated to a time information determined by means of the time meter.