Hybrid type gas insulation switch gear apparatus

Details Hybrid type gas insulation switch gear apparatus Hybrid type gas insulation switch gear apparatus

2001-07-30

2002-10-01

Tolin, Gerald (Department: 2835)

Electricity: electrical systems and devices

Housing or mounting assemblies with diverse electrical...

For electrical power distribution systems and devices

C218S067000

Reexamination Certificate

active

06459568

ABSTRACT:

CROSS-REFERENCE TO RELATED APPLICATIONS
This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2000-231861, filed Jul. 31, 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 a 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 bushings
1
-
1
,
1
-
2
, a 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. The circuit breaker
2
also includes a fixed electrode
2
A and a movable electrode
2
B capable of contact with the fixed electrode
2
A which are arranged within the enclosure
2
C. 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 portion of the enclosure
2
C, and a bushing
1
having a 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. The disconnecting switch
3
also includes a fixed electrode
3
A and a movable electrode
3
B capable of being moved to contact the fixed electrode
3
A, which are arranged within the enclosure
3
C. 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 portion of the enclosure
2
C via a connecting cylinder
10
having a diameter smaller than that of said other end portion. Further, a bushing
1
-
2
including a conductor
1
A-
2
connected to the fixed electrode
3
A is vertically mounted to the open end portion 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 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.
BRIEF SUMMARY OF THE INVENTION
An object of the present invention is to provide a hybrid type gas insulation switch gear apparatus, which permits miniaturizing and decreasing the weight of the entire apparatus and also permits decreasing the manufacturing cost.
For achieving the object described above, the hybrid type gas insulation switch gear apparatus of the present invention is constructed as summarized below.
According to a first aspect of the present invention, there is provided a hybrid type gas insulation switch gear apparatus, comprising:
a main enclosure including a first cylindrical section having a base and a second cylindrical section branched from the base of the first cylindrical section and obliquely extending from the first cylindrical section, the first and second cylindrical sections having first and second opening sections;
an insulating bushing mounted to the first opening section and including a hollow insulating housing and a conductor extended in the hollow insulating housing;
an insulating enclosure mounted to the second opening section and communicated with the second cylindrical section, an insulating gas being sealed in the main enclosure, the insulating bushing and the insulating enclosure;
a first fixed electrode electrically connected to the conductor and a first movable electrode which are received in the first cylindrical section to form a disconnecting switch;
an insulating member configured to support the first fixed electrode on the first cylindrical section;
a connecting conductor electrically connected to the first movable electrode of the disconnecting switch, arranged in the first cylindrical section, and including a branched conductor extending in the second cylinder;
a main electrode provided in the insulating enclosure;
a second movable electrode provided in the insulating enclosure and configured to be moved to the main electrode and electrically connected to the main electrode and the branched conductor to form a circuit breaker connected to the disconnecting switch in series;
a current transformer arranged around the second cylindrical section to detect a current flowing through the connecting conductor; and
a first earth switch mounted to the first cylindrical section and including a movable counter electrode configured to connect and disconnect the fixed electrode of the disconnecting switch to the ground.
According to a second aspect of the present invention, there is provided a hybrid type gas ins

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