Electricity: circuit makers and breakers – Interlocking – Drawout-type switchgear
Patent
1998-05-13
2000-02-29
Scott, J. R.
Electricity: circuit makers and breakers
Interlocking
Drawout-type switchgear
200 5026, 361609, H01H 900, H02B 1100
Patent
active
060311924
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an arrangement for controlling the movement of a drawout circuit-breaker, mounted in a switchgear.
BACKGROUND INFORMATION
German Patent Application No. DE 35 45 780 A1 describes a switching device. Depending on the position of the switchgear door, a blockable and releasable stop element generally prevents a tool from engaging in order to move the drawout circuit-breaker in the drawout frame when the switchgear door is open. The stop element is permanently connected to a guide rod, which can be blocked by a bolt in all positions--operating position, test position and disconnect position--allowing the bolt to be directly actuated via a flexible transfer element by opening the switchgear door. The sole purpose of this measure is personal protection.
U.S. Pat. Nos. 2,777,024, 2,921,998 and 4,044,113 describe switchgear with drawout circuit-breakers. U.S. Pat. No. 2,777,024 takes into account only the standard conditions which prevent the circuit-breaker from moving when activated or when the circuit-breaker is being turned on. There is no mention of a locking arrangement.
Unlike the present invention, in the arrangement described in U.S. Pat. No. 2,921,998, the locking arrangement is located on the circuit-breaker for safe replacement of the circuit-breaker.
As described in U.S. Pat. No. 4,044,113, a closure member interacts with the rails in order to access the actuating shaft of the traveling mechanism and blocks the drawout circuit-breaker in the test or disconnect position. At the same time, this prevents the circuit-breaker from being replaced.
SUMMARY OF THE INVENTION
The present invention relates to an arrangement for controlling the movement of a drawout circuit-breaker, mounted in a switchgear. The drawout circuit-breaker can be moved in an operating position, test position and disconnect position relative to a drawout frame by means of an actuating shaft pivoted in the drawout frame and operated by a detachable actuating crank. A controllable closure member enables or prevents the actuating crank from coming into contact with the actuating shaft, and the drawout circuit-breaker can be removed from the drawout frame after a door is opened.
An object of the present invention is to expand the safety precautions for drawout circuit-breakers to include protection of the equipment, keeping the existing construction largely unchanged or implementing additional safety measures with as little additional technical equipment as possible. The invention achieves this goal by allowing the closure member to be controlled by a locking arrangement that is located in the drawout frame and interacts with the drawout circuit-breaker and by a closing cylinder located in the switchgear door in a way that prevents the drawout circuit-breaker from moving in a preferred position, especially in the disconnect position, while allowing the drawout circuit-breaker to be removed from the drawout frame.
The locking arrangement according to the present invention can be used to easily implement a multitude of equipment-related protective measures which can be easily adapted to a wide variety of safety conditions for protecting the equipment by incorporating the detection and evaluation of preferred positions of the drawout circuit-breaker within the drawout frame. An important consideration here is the fact the safety conditions concerned are determined by stationary units and are transferred to the drawout circuit-breaker when it is inserted into the drawout frame. As a result, the same safety conditions continue to apply when the drawout circuit-breaker is replaced by another drawout circuit-breaker.
In an advantageous exemplary embodiment of the present invention, the locking arrangement includes a position-detecting plate that is pivoted on a mounting plate and is connected to a cam. The cam is also pivoted on the mounting plate. The position-detecting plate is in contact with a Bowden control which transmits the rotary position of the closing cylinder so that the cl
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Scott J. R.
Siemens Aktiengesellschaft
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