Tripping device for a circuit breaker
AssigneeSiemens Energy Global GmbH & Co. KG
InventorsThomas Hilker, Gunnar Lutzke, Rudolf Groth
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Abstract
A trip device for a power circuit breaker has a trip element, a trip circuit with a trip coil, which, when energized, is configured to effect a movement of the trip element, and at least one electrical delay element, which can be connected to the trip circuit and reduces the rate of a rise in a current flowing in the trip coil once the trip circuit has been closed and/or delays a rise in a current flowing in the trip coil once the trip circuit has been closed.
Claims10
A tripping device for a circuit breaker, the tripping device comprising:
- a tripping element;
- a tripping circuit having a tripping coil being configured, upon being energized, to effect a movement of said tripping element;
- and
- at least one electrical delay element configured to be connected to said tripping circuit and reducing a steepness of a current increase of a current flowing in said tripping coil after said tripping circuit has been closed and/or delays the current increase of the current flowing in said tripping coil after said tripping circuit has been closed, wherein said at least one electrical delay element has a delay coil configured to be connected in series with said tripping coil, wherein an ohmic resistance of said delay coil is lower than an ohmic resistance of said tripping coil.
A method for increasing a tripping time of a tripping device for a circuit breaker, the tripping device having a tripping element and a tripping circuit with a tripping coil being configured, upon being energized, to affect a movement of the tripping element, which comprises the step of:
- connecting at least one electrical delay element to the tripping circuit for reducing a steepness of a current increase of a current flowing in the tripping coil after the tripping circuit has been closed and/or delays the current increase of the current flowing in the tripping coil after the tripping circuit has been closed, wherein said at least one electrical delay element has a delay coil configured to be connected in series with said tripping coil, wherein an ohmic resistance of said delay coil is lower than an ohmic resistance of said tripping coil.
Dependencies are inferred from the claim text.