High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Multiple break
Reexamination Certificate
2001-12-04
2003-11-18
Mai, Anh (Department: 2832)
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Multiple break
C218S078000, C218S084000
Reexamination Certificate
active
06649853
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a fluid pressure driving apparatus for switching a contact of gas insulated switchgear, and in particular, to a combined type fluid pressure driving apparatus for driving a circuit breaker and a disconnecting switch.
2. Description of the Related Art
In recent years, a gas insulated switchgear has been mainly used in switchgear for electric power. The gas insulated switchgear is constructed in a manner that many switches are arranged in a metal housing container filled with an insulating gas. Various type of switchgears have been proposed such that a gas insulated disconnecting switch is interposed between a power circuit breaker and any two busbars, between two busbars, between the power circuit breaker and a grounding contact or between the power circuit breaker and a power transmission system.
The typical conventional gas insulated switchgear has been disclosed in U.S. Pat. No. 5,841,087, and a disconnecting switch of the gas insulated switchgear will be described below with reference to FIG.
14
and FIG.
15
.
FIG. 14
is a front sectional view showing a conventional gas insulated disconnecting switch, and
FIG. 15
is a side sectional view taken along a line B—B of FIG.
14
.
As shown in
FIG. 14
, a disconnecting switch
200
is received in a grounding metal container
201
, which is filled with an insulating gas, e.g., SF
6
gas. An upper portion of the grounding metal container
201
is formed with first and second attachment flanges
203
and
204
, and a first stationary electrode
205
is fixed to the first attachment flange
203
via an insulating spacer. Likewise, a second stationary electrode
206
is fixed to the second attachment flange
204
. Namely, these stationary electrodes
205
and
206
are fixed in a state of being electrically insulated from the grounding metal container
201
.
Further, as shown in
FIG. 15
, a lower portion of the grounding metal container
201
is formed with a third attachment flange
208
, and a side portion thereof is formed with a fourth attachment flange
209
. A third stationary electrode
210
electrically connected to the grounding metal container
201
is fixed to the third attachment flange
208
, and a metallic cover
211
is attached to the fourth attachment flange
209
. A hollow insulating cylinder
212
extending toward the grounding metal container
201
is fixed to the cover
211
, and a drive shaft
213
is inserted into a hollow portion of the insulating cylinder
212
. The drive shaft
213
is extended from the outside of the grounding metal container
201
to the inside thereof, and penetrates through the cover
211
while airtightly keeping the insulating gas.
In FIG.
14
and
FIG. 15
, first to third cylindrical movable electrodes
215
to
217
individually pair with the first to third stationary electrodes
205
,
206
and
210
so that first to third contacts
218
to
220
are formed. Further, the movable electrodes
215
to
217
are electrically connected to a current terminal
223
by current application via a sliding contact (not shown) and a shielding element container
222
.
The current terminal
223
is connected with another switching device, e.g., a circuit breaker. A main bus conductor is connectable to the stationary electrode insulated from the grounding metal container
201
, that is, the first and second stationary electrodes
205
and
206
. Thus, the first and second contacts
218
and
219
perform a function as busbar or main bus line select disconnecting switch. Further, the third stationary electrode
210
making short-circuit with the grounding metal container
201
has a ground potential; therefore, the third contact
220
functions as a ground system.
By the way, a gearbox
225
for making a switching operation of the contacts
218
to
220
is received in the metal container
222
. The gearbox
225
includes first to third cams
226
,
230
and
233
, and first to sixth levers
227
,
228
,
231
,
232
,
234
and
235
. More specifically, the first cam
226
is connected to the first movable electrode
215
, and the first and second levers
227
and
228
are arranged so as to hold the first cam
226
between them. The second cam
230
is connected to the second movable electrode
216
, and the third and fourth levers
231
and
232
are arranged so as to hold the second cam
230
between them. The third cam
233
is connected to the third movable electrode
217
, and the fifth and sixth levers
234
and
235
are arranged so as to hold the third cam
233
between them.
Further, the gearbox
225
drives three movable electrodes, that is, first to third movable electrodes
215
to
217
so as to separate and close the paired first to third stationary electrodes
205
,
206
and
210
, and thereby, makes the switching operation of the first to third contacts
218
to
220
.
The first movable electrode
215
is connected with the first cam
226
, and the paired first and second levers
227
and
228
are fixed to the drive shaft
213
at an angle different from each other so as to convert a rotating motion of the drive shaft
213
into a reciprocating motion. Further, the levers
227
and
228
of the first cam
226
are individually provided with a pin at their distal end portion. Both sides of the first cam
226
are formed with a circular-arc groove, and the pin of each distal end of the levers
227
and
228
is slidably inserted into the above groove.
The first cam
226
constructed as described above functions as a cam mechanism for converting a rotary driving force of the drive shaft
213
into a linear reciprocating motion. Therefore, the first cam
226
converts a rotary driving force of the drive shaft
213
into a linear reciprocating motion, and then, transmits it to the first movable electrode
215
. When the rotary driving force is transmitted to the first movable electrode
215
, the first movable electrode
215
makes a linear reciprocating motion so as to carry out a switching operation of the first contact
218
.
In this case, the first cam
226
is formed with a thin and long slot
236
(as shown in
FIG. 14
) having a width such that the drive shaft
213
can pass through there. The drive shaft
213
passes through the slot
236
, and thereby, this performs a function as one fulcrum for the linear reciprocating motion of the first cam
226
.
On the other hand, the second and third movable electrodes
216
and
217
include the same cam mechanism as the above-mentioned first movable electrode
215
, and make the same linear reciprocating motion.
The gearbox
225
is rotated when a driving force is transmitted to the drive shaft
213
from an operating mechanism section (not shown) arranged at the outside of the grounding metal container
201
in the drive shaft
213
of the disconnecting switch
200
. The above operating mechanism section and the gearbox
225
constitute a driving system for switching and driving the first to third contacts
218
to
220
.
In the conventional driving apparatus, the first to third contacts
218
to
220
are switched and driven by the driving system including the operating mechanism section and the gearbox
225
. More specifically, when the operating mechanism section is driven, the drive shaft
213
of the gearbox
225
is rotated by receiving the driving force, and then, the first lever
227
to the sixth lever
235
are rotated with the rotation.
Then, each distal pin of the rotating first and second levers
227
and
228
moves along the cam groove of the first cam
226
. Likewise, each distal pin of the rotating third and fourth levers
231
and
232
moves along the cam groove of the second cam
230
, and further, each pin of the rotating fifth and sixth levers
234
and
235
moves along the cam groove of the third cam
233
.
The first lever
227
to the sixth lever
235
and the first cam
226
to the third cam
233
interact with each other, and thereby, it is possible to convert the rotating motion of the drive shaft
213
into a line
Furuta Hiroshi
Kobayashi Akio
Kobayashi Yoshikata
Nakajima Fumio
Shimizu Masaharu
Fishman M.
Mai Anh
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