Electricity: electrical systems and devices – Safety and protection of systems and devices – Transient responsive
Patent
1992-10-13
1994-06-21
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Transient responsive
361117, 361119, H02H 906, H02H 322, H02H 104
Patent
active
053232895
ABSTRACT:
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 suppressor 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 arrestor.
REFERENCES:
patent: 4497033 (1985-01-01), Hernandez et al.
patent: 4758920 (1988-07-01), McCartney
patent: 4901183 (1990-02-01), Lee
patent: 4999729 (1991-03-01), Stifter
Longsdorf Randy J.
Nelson Richard L.
Leja Ronald W.
Pellinen A. D.
Rosemount Inc.
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