Selective release unit for circuit breaker

Details Selective release unit for circuit breaker Selective release unit for circuit breaker

2001-03-16

2003-04-29

Donovan, Lincoln (Department: 2832)

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Tripping means

C335S035000, C335S038000, C335S042000, C335S176000

Reexamination Certificate

active

06556111

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a selective release unit for a circuit breaker.
BACKGROUND OF THE INVENTION
A release unit with an armature or gate and a yoke is known from the prior art. If the gate is applied, it has to shift the front gate further so that a brief high current does not result in release. The insertion of a magnet flap in a direction leading away from the magnet yoke in order to brake the magnet flap in its closing movement is also known from the prior art. It is thus possible to prevent a release in the case of brief overcurrents.
One disadvantage of prior art solutions is that in circuit breakers switched in series with one large and several small parallel circuit breakers, the disengagement of one of the small circuit breakers could possibly lead to disengagement of the large circuit breakers, such that the entire operation no longer has any current. But only the subordinate breakers should release in the case of a strong overcurrent or short circuit. For example, selectivity should be achieved in circuit breakers up to 10 kA such that no disengagement occurs with a current of 3 kA at 5 msec in large circuit breakers.
A release mechanism for a circuit breaker shown in
FIG. 6
is known from the earlier German patent application No. 199 03 911.9. This breaker
1
has a moveable contact
2
that is rotatably supported on the shaft
3
of a selector shaft
4
. The selector shaft
4
is itself supported in a polhode housing (not shown) and has two diametrically opposed satellite shafts
5
and
6
that are entrained around the axis
3
with a rotation of the selector shaft
4
. The axis
5
is the point of application for an articulation mechanism
7
that is connected with a ratchet lever
8
. The ratchet lever is pivotably supported on a shaft
10
positioned on the breaker housing
9
and is released in the case of an overcurrent or short circuit by a breaker latch
11
to enable the separated state of the contact
2
shown in FIG.
6
.
The breaker latch
11
can be actuated by a release lever
13
pivotable around a rotation axis
12
. The release lever
13
, on the other hand, is in working connection with a release shaft
14
that is supported on a shaft
15
carried by the breaker housing
9
. A lifter
16
is formed on the release shaft
14
, which is pivotable against the force of a spring wound around the shaft
15
(not shown in detail here) in the clockwise direction in FIG.
6
.
A magnet yoke
17
is mounted on the breaker housing
9
in the lower section of the circuit breaker and encompasses an electric rail
19
connected with the contacts of the breaker
1
. An armature element
21
designed as a flap is located opposite the magnet yoke
17
and it is pivotably connected via a hinge connection
18
with a stationary section of the circuit breaker (not shown in detail). The flap
21
is also connected through a spring
20
with a stationary section of the rail
19
, said spring acting on the flap in the clockwise direction. In its upper region, as shown in Figure the flap
21
is equipped with a bracket
23
permanently attached to it which, by a pivoting movement of the flap
21
, can be brought into contact with the cam
16
to rotate the release shaft
14
, thereby actuating the breaker latch
11
via the release lever
13
and thus initiating the disengagement process in the circuit breaker
1
. Reference is made to the description of the above-mentioned German patent application for further details on this prior solution.
SUMMARY OF INVENTION
The purpose of the invention is to make available a selective release unit, which, if incorporated in a large circuit breaker, does not cause release of the latter if release occurs in a subordinate smaller circuit breaker.


REFERENCES:
patent: 3264435 (1966-08-01), Klein et al.
patent: 3849751 (1974-11-01), Link et al.
patent: 5225800 (1993-07-01), Pannenborg et al.
patent: 5831499 (1998-11-01), Batteux et al.
patent: 4005713 (1991-08-01), None

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