Improved lightning protection for field mounted instruments

Details Improved lightning protection for field mounted instruments Improved lightning protection for field mounted instruments

H - Electricity

02

H

H02H 3/22 (2006.01) H02H 9/06 (2006.01)

Patent

CA 2113419

ABSTRACT OF THE DISCLOSURE A protection circuit is provided for protecting sensitive electrical field instruments from a transient voltage strike and for ensuring that the instruments will meet safety approval during high potential voltage testing. The first and second wires of a two-wire circuit are connected to a first and second terminal respectively. A first surge arrestor electrically couples a first path between the first and second terminal. An impedance and a transient suppresor are connected in series and electrically couple a second path between the first and second terminal. The second path is coupled in parallel with the first path between the first and second terminal and is coupled closer to the internal components of the electrical instruments to be protected than is the first path. A second surge arrestor is electrically coupled between the second terminal and ground, and has a higher voltage breakdown potential than the first surge arrestsor.

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