Tripping device for a circuit breaker

Patent metadata

Field	Value
Publication number	US-12573573-B2
Application number	US-202118256958-A
Country	US
Kind code	B2
Filing date	Nov 30, 2021
Priority date	Dec 11, 2020
Publication date	Mar 10, 2026
Grant date	Mar 10, 2026

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.

First claim

The invention claimed is:

1 . 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.

2 . The tripping device according to claim 1 , further comprising a magnetic core, around which a winding of said delay coil runs.

3 . The tripping device according to claim 2 , wherein said magnetic core is disposed so as to be displaceable with respect to said delay coil, with a result that an inductance of said delay coil is able to be changed.

4 . The tripping device according to claim 1 , wherein a number of turns of said delay coil, in said turns electric current flows when said tripping circuit is closed, is settable.

5 . The tripping device according to claim 4 , wherein said delay coil has a plurality of taps or an adjustable tap in order to set the number of turns.

6 . The tripping device according to claim 1 , further comprising an electrical resistor connectable in series with said tripping coil and said delay coil and functioning as a further delay element.

7 . The tripping device according to claim 6 , wherein said electrical resistor has a settable ohmic resistance.

8 . The tripping device according to claim 1 , further comprising a common housing, said tripping coil and said at least one electrical delay element are disposed in said common housing.

9 . A circuit breaker, comprising:
a tripping device according to claim 1 , said tripping device is configured to trigger a switching process of the circuit breaker.

10 . 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.

Assignees

• Siemens Energy Global Gmbh & Co Kg

Inventors

• Hilker Thomas
• Lutzke Gunnar
• Groth Rudolf

Classifications

• H01H71/2454

  characterised by the magnetic circuit or active magnetic elements · CPC title

• H01F7/18

  Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings · CPC title

• H01H71/44 Primary

  having means for introducing a predetermined time delay (by short-circuited winding H01H71/30; by additional armature H01H71/34) · CPC title