High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Air-current blowout
Reexamination Certificate
2001-08-01
2003-03-25
Donovan, Lincoln (Department: 2832)
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Air-current blowout
C218S079000, C218S080000, C218S154000, C218S155000
Reexamination Certificate
active
06538224
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2000-234920, filed Aug. 2, 2000, the entire contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a hybrid type gas insulation switch gear apparatus installed in an electrical building such as a substation and, particularly to a hybrid type gas insulation switch gear apparatus having an improved arrangement of various equipments such as the circuit breaker.
2. Description of the Related Art
In general, the bus and the iron tower in an air substation have a long life and, thus, are less likely to be renewed in replacing the switch gear apparatus. Therefore, a gear switch apparatus of a high performance and a high reliability is substituted in many cases while effectively utilizing the existing air insulating bus, etc. In order to cope with such a requirement, proposed to date as an equipment for power supply is a hybrid type gas insulation switch gear apparatus prepared by combining a plurality of switch gears for power supply such as an circuit breaker, and a disconnector or a disconnecting switch.
FIGS. 1 and 2
collectively show a general hybrid type gas insulation switch gear apparatus as an example of the hybrid switch gear apparatus, wherein
FIG. 1
is a circuit diagram of a general hybrid type gas insulation switch gear apparatus, and
FIG. 2
shows the construction of the hybrid type gas insulation switch gear apparatus connecting to the circuit diagram shown in FIG.
1
.
The hybrid type gas insulation switch gear apparatus shown in
FIG. 2
comprises a plurality of bushings
1
-
1
,
1
-
2
, an circuit breaker
2
, a disconnecting switch
3
, an earth switch
4
, and a current transformer
5
.
The circuit breaker
2
includes an enclosure
2
C, which is arranged within an electric power station via supporting members
7
such that the axis of the enclosure
2
C is parallel to the installing plane within the electric power station. A fixed electrode
2
A and a movable electrode
2
B capable of contact with the fixed electrode
2
A are arranged within the enclosure
2
C to constitute the circuit breaker
2
. The fixed electrode
2
A and movable electrode
2
B are arranged on the same axis. An operating mechanism
8
for operating the movable electrode
2
B is mounted to one open end of the enclosure
2
C, and a bushing
1
having a central conductor
1
A-
1
connected to the movable electrode
2
B is vertically mounted to a cylindrical connecting portion projecting upward from the circumferential surface of the enclosure
2
C.
Also, the disconnecting switch
3
includes a cylindrical enclosure
3
C, which is mounted within the electric power station via the supporting member
7
such that the axis of the enclosure
3
C is perpendicular to the installing plane of the electric power station. A fixed electrode
3
A and a movable electrode
3
B capable of being moved to contact the fixed electrode
3
A are arranged within the enclosure
3
C to constitute the disconnecting switch
3
. The fixed electrode
3
A and the movable electrode
3
B are arranged on the same axis. A disconnecting switch operating mechanism
9
for operating the earth switch
4
and the movable electrode
3
B is mounted to the circumferential surface of the enclosure
3
C. A cylindrical connecting portion projecting upward from the circumferential surface of the enclosure
3
C of the disconnecting switch
3
is connected to the other open end of the enclosure
2
C via a connecting cylinder
10
having a diameter smaller than that of the other end. Further, a bushing
1
-
2
including a central conductor
1
A-
2
connected to the fixed electrode
3
A is vertically mounted to the open end positioned above the enclosure
3
C.
Further, the current transformer
6
is mounted to the outer circumferential surface of the cylindrical connecting portion of the enclosure
2
C, which is mounted to the mounting flange portion of the bushing
1
-
1
in a manner to surround the central conductor
1
A-
1
. Also, the current transformer
5
is mounted to the outer circumferential surface of the connecting cylinder
10
in a manner to surround a current conductor.
Incidentally, a sealing gas such as a SF
6
gas is sealed in the enclosure
2
C of the circuit breaker
2
and in the enclosure
3
C of the disconnecting switch
3
. In this case, the gas spaces of the enclosures
2
C and
3
C are partitioned by an insulating spacer that also serves to support the conductor arranged in the connecting portion between the enclosure
2
C and the enclosure
3
C.
In the hybrid type gas insulating switch gear apparatus of the construction described above, the circuit breaker
2
and the bushing
1
are independent of each other. Also, the circuit breaker
2
and the disconnecting switch
3
are housed in the different enclosures
2
C and
3
C. In addition, the enclosure
2
C is installed such that the axis of the enclosure
2
C is parallel to the installing plane, and the enclosure
3
C is arranged such that the axis of the enclosure
3
C is perpendicular to the installing plane. It follows that the entire hybrid type gas insulation switch gear apparatus is rendered bulky and heavy, with the result that a large installing area is required and the apparatus cost is rendered high.
In addition, it is necessary to install two current transformers for the discrimination between an accident in the circuit breaker and another accident in another portion.
FIG. 3
is a circuit diagram of a 1·½ bus as a layout of a representative substation. Incidentally, the switch gear apparatuses corresponding to the portions surrounded by broken lines, which are shown in
FIG. 3
, are equal to each other in construction. As shown in the drawing, the switch gear apparatus surrounded by each broken line comprises an circuit breaker
20
and two disconnecting switches
30
arranged to have the circuit breaker
20
sandwiched therebetween such that these circuit breaker
20
and the two disconnecting switches
30
are electrically connected in series. Incidentally, a reference numeral
90
denotes a current transformer.
FIG. 4
is a cross sectional view showing an example of the conventional hybrid type gas insulation switch gear apparatus used as such a 1·½ type hybrid type switch gear apparatus. Incidentally, it is also possible to use such a hybrid type gas insulation switch gear apparatus for the connection between the bushes of duplicate bus lines, though such bus lines are not shown in the drawing. To be more specific, the circuit breaker
20
arranged in the hybrid type gas insulation switch gear apparatus comprises a fixed electrode
21
and a movable electrode
22
both housed in an enclosure
2
C and is opened or closed by an operating mechanism
28
.
Disconnecting switches
30
A,
30
B formed in enclosures
3
A,
3
B, respectively, are arranged on both sides of the circuit breaker
20
. The disconnecting switches
30
A,
30
B are opened and closed by operating mechanisms
34
A,
34
B, respectively. Also, the enclosures
3
A,
3
B are supported by a framework. The circuit breaker
20
and the disconnecting switch
30
are connected to each other via an adapter conductor X housed in a container.
Bushings
1
-
1
,
1
-
2
are mounted to the enclosures
3
A,
3
B housing the disconnecting switches
30
A,
30
B via insulating spacers
60
A,
80
, respectively, and the internal conductors
1
A-
1
,
1
A-
2
are connected to the disconnecting switches
30
A,
30
B, respectively. Further, earth switches
4
A,
4
B, which are constructed to be capable of being opened and closed by the operating mechanisms
43
A,
43
B, are arranged between the adapter conductor X and the disconnecting switch
30
A and between the adapter conductor X and the disconnecting switch
30
B, respectively. Incidentally, each of reference numerals
70
A and
70
B shown in
FIG. 4
represents a current transformer.
It should be note
Furuta Hiroshi
Matsushita Kozo
Murase Hiroshi
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