Arrangement for controlling the switching of a power circuit bre

Details Arrangement for controlling the switching of a power circuit bre Arrangement for controlling the switching of a power circuit bre

1996-05-24

1997-08-26

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific circuit breaker or control structure

335 17, 200401, H01H 7300

Patent

active

056616279

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to a device for controlling the switching-on of a power circuit breaker as a function of at least one operating parameter.


BACKGROUND INFORMATION

French Patent Document No. 1 574 048 A describes a device for controlling the switching of a power circuit breaker as a function of one or more operating parameters. As described therein, the operating parameters are the switch position of the power circuit breaker and the state of the energy store. A switch-on command is made ineffective by the coupling member if the switching contacts are closed and the energy store is loaded. This is a means of preventing the switching mechanism of the power circuit breaker from being stressed unnecessarily through no-load switching and so-called pumping and the lifespan of the power circuit breaker being negatively influenced as a result.


SUMMARY OF THE INVENTION

The present invention provides a device for controlling the switching-on of a power circuit breaker as a function of at least one operating parameter, which power circuit breaker has switching contacts which are movable relative to one another and, for actuating the switching contacts, an energy store as well as a ratchet device by way of which the energy store can be latched in the loaded state and which can be released manually or under remote control. The operating parameter as well as an "ON" command are each present in the form of a mechanical movement. The switching contacts are transferrable from the closed state through actuation of a tripping latch to the open state, and the ratchet device has a coupling member which can be acted upon by the operating parameter in order to make the "ON" command ineffective. An object of the present invention is to provide a device of the aforementioned type such that further operating parameters desired for reliable operation of the power circuit breaker can likewise be taken into account without the device entailing a significantly increased cost or its reliability being impaired.
The aforementioned objective is solved according to the present invention by the following further features: 1) the coupling member can be actuated by a coupling shaft, 2) the coupling shaft can be acted upon by the at least one operating parameter, and 3) for reporting the readiness of the power circuit breaker to switch on, an indicator member can be actuated depending on the position of the coupling shaft such that the readiness of the power circuit breaker to switch on is signalled only for a taut energy store and a coupling shaft which is not actuated.
The coupling shaft offers an advantageous possibility to take into account any influences, e.g., the lack of a trip element to be inserted as an assembly into the power circuit breaker, or the lacking excitation of an undervoltage release. Whenever a state exists due to which the switching-on of the power circuit breaker is to be prevented, the coupling shaft brings the coupling member out of engagement with the ratchet device. An "ON" command, no matter whether it is given manually or by an electromagnet, then has no effect. This state is brought directly to the attention of the user of the power circuit breaker by the indicator member.
An advantageous exemplary embodiment of the present invention includes the following features: locking shaft, hinged bearing, which coupling lever is provided with a coupling peg gripping the catch peg, can be actuated by an "ON" command, an actuation of the lever mount corresponding to a displacement of the hinged bearing of the coupling lever in the sense of a rotation of the locking shaft for releasing the energy store, and in order to bring the coupling peg into or out of engagement with the catch peg.
The coupling shaft can be provided with one or more sensor levers which are used for sensing operating parameters arising inside or outside of the power circuit breaker, these parameters possibly being, in particular, "Position of the switching contacts of the power circuit breaker", "Presence of an

REFERENCES:
patent: 2640122 (1953-05-01), Oppel et al.
patent: 3198906 (1965-08-01), Frink et al.
patent: 3875360 (1975-04-01), Rys
patent: 4506246 (1985-03-01), Wong

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