Electricity: circuit makers and breakers – Contact moved by sudden release of stored energy
Reexamination Certificate
2001-06-13
2003-05-13
Friedhofer, Michael (Department: 2832)
Electricity: circuit makers and breakers
Contact moved by sudden release of stored energy,
C200S501000
Reexamination Certificate
active
06563067
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a control device for make break switches, such as breakers, installed in, for example, transforming stations and switchyards.
2. Discussion of Background
As an operating force for a control device for breakers, as a make break switch, a spring force is practically used.
FIGS. 70 through 73
illustrate a conventional control device for breakers, which is disclosed in Japanese Unexamined Patent Publication JP-A-63-304542.
FIG. 70
is a perspective view illustrating a structure of the control device for the breaker.
FIG. 71
illustrates an important portion of the structure of the control device for the breaker, wherein the breaker is in a state of closing a circuit, and breaking torsion bars and closing torsion bars are prestressed.
FIG. 72
illustrates an important portion of the structure of the control device for the breaker, wherein the breaker is in a state of opening the circuit, an opening torsion bar is released, and a closing torsion bar is prestressed.
FIG. 73
illustrates an important portion of the structure of the control device for the breaker, wherein the breaker is in a state of closing the circuit, the opening torsion bar is prestressed, and the closing torsion bar is released.
In these figures, numerical reference
1
designates a case; numerical reference
24
designates a cylinder, fixed to the case
1
; and numerical references
26
and
27
respectively designate rotatable levers, which are engaged with pins (not shown), formed on end surfaces of the cylinder
24
. Numerical references
28
and
34
designate the opening torsion bars; and numerical references
29
and
35
designate the closing torsion bars. The opening torsion bar
28
is fixed to the case
1
at one end and also fixed to the lever
26
at the other end. The opening torsion bar
34
is fixed to a rotational shaft
32
at one end as illustrated in
FIG. 71
, and fixed to the lever
26
at the other end.
The closing torsion bar
29
is fixed to the case
1
at one end and fixed to the lever
27
at the other end. The closing torsion bar
35
is fixed to a rotational shaft
33
at one end, as illustrated in
FIG. 71
, and fixed to the lever
27
at the other end. Although, details will be described in this specification, because the closing torsion bars
29
and
35
are released when the opening torsion bars
28
and
34
are prestressed, prestressing energy of the closing torsion bars
29
and
35
is larger than prestressing energy of the opening torsion bars
28
and
34
.
Numerical reference
37
designates a making lever fixed to the rotational shaft
33
, wherein the making lever is applied with a counterclockwise rotational force in
FIG. 71
by the closing torsion bars
29
and
35
. Numerical reference
2
designates a camshaft, supported by the case
1
; numerical reference
3
designates a cam, mounted on the camshaft; numerical reference
13
designates a second pin, formed in the cam; and numerical reference
14
designates a making latch, engaged with the second pin
13
. Numerical reference
15
designates a making trigger, engaged with the making latch
14
; and numerical reference
16
designates a making electromagnet having a plunger
17
.
Numerical reference
38
designates a rotational shaft, supported by the case
1
, whereby the rotational shaft is driven by a motor (not shown) in a counterclockwise direction. Numerical reference
39
designates a pinion, fixed to the rotational shaft
38
; and numerical reference
40
designates a gear, engaged with the pinion
39
and fixed to the camshaft
2
, wherein teeth are partly removed so that the engagement with the pinion
39
is released when the closing torsion bars
29
and
35
are prestressed. Numerical reference
41
designates a link, connecting the making lever
37
with the gear
40
.
Numerical reference
36
designates a breaking lever, fixed to the rotational shaft
32
, wherein the breaking lever is applied with a rotational force in a counterclockwise direction by the opening torsion bars
28
and
34
. Numerical references
8
and
9
respectively designate a first pin and a rotor, both of which are located in the breaking lever
36
. Numerical reference
18
designates a releasing latch, which is engaged with the first pin
8
and applied with rotational force in a clockwise direction by a spring
43
.
Numerical reference
19
designates a releasing trigger, engaged with the releasing latch
18
. Numerical reference
20
designates a releasing electromagnet having a plunger
21
. Numerical reference
22
designates a movable contact of the breaker, wherein the movable contact is connected to the breaking lever
36
through a linkage mechanism
23
. Numerical reference
42
designates a buffer, connected to the breaking lever
36
to relax an impact applied at time of opening and closing the movable contact
22
.
In the next, an operation of opening the circuit will be described. The breaking lever
36
is constantly applied with a rotational force in a counterclockwise direction by the opening torsion bars
28
and
34
, and the rotational force is retained by the releasing latch
18
and the releasing trigger
19
. When the releasing electromagnet
20
is excited in this state, the plunger
21
is moved in a rightward direction; the releasing trigger
19
is rotated in a clockwise direction; and the releasing latch
18
is rotated in a counterclockwise direction by a counter force, applied from the first pin
8
. When the releasing latch
18
is released from the first pin
8
, the breaking lever
36
is rotated in a counterclockwise direction, and the movable contact
22
is driven in a direction of opening the circuit. A state that the operation of opening the circuit is completed is illustrated in FIG.
72
.
An operation of closing the circuit will be described. In
FIG. 72
, the cam
3
is connected to the making lever
37
through the camshaft
2
, the gear
40
, and the linkage
41
, wherein a rotational force in a clockwise direction is applied by the closing torsion bars
29
and
35
. The rotational force is retained by the making latch
14
and the making trigger
15
.
When the making electromagnet
16
is excited to drive the plunger
17
in the rightward direction, the making trigger
15
is rotated in the clockwise direction; and the making latch
14
is rotated in the counterclockwise direction by a counterforce applied from the second pin
13
. Because the making latch
14
is released from the second pin
13
to rotate the cam
3
in the clockwise direction so that the rotor
9
located in the breaking lever
36
is pushed up, the breaking lever
36
twists the opening torsion bars
28
and
34
in the clockwise direction.
When the breaking lever
36
is rotated by a predetermined angle and the movable contact
22
is driven in the direction of closing the circuit, the releasing latch
18
is engaged with the first pin
8
, and the releasing trigger
19
is engaged with the releasing latch
18
. The cam
3
is rotated while holding the breaking lever
36
through the rotor
9
until an engagement between the releasing latch
18
and the first pin
8
and an engagement between the releasing trigger
19
and the releasing latch
18
are stabilized. Thereafter, the cam
3
is disconnected from the rotor
9
.
FIG. 73
illustrates a state that the operation of closing the circuit is completed and the first pin
8
is held by the releasing latch
18
. The control device for breaker should be operated to reopen the circuit immediately after closing the circuit, wherein the operation of reopening the circuit is to open the circuit from the state illustrated in FIG.
73
.
The closing torsion bars
29
and
35
are prestressed as follows. As illustrated in
FIG. 73
, immediately after completing to close the circuit, the closing torsion bars
29
and
35
are in a releasing state. By rotating the pinion
39
in the counterclockwise direction by the motor (not shown), the gear
40
is rotated in the clockwise di
Nakajima Nobuya
Ohtsuka Kyouichi
Friedhofer Michael
Leydig , Voit & Mayer, Ltd.
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