High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Multiple break
Reexamination Certificate
2001-08-02
2003-02-18
Enad, Elvin (Department: 2832)
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Multiple break
C218S043000
Reexamination Certificate
active
06521855
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a switchgear apparatus for power supply, more particularly, to a hybrid (-type) gas insulation switchgear apparatus with improvement in arrangement of various constitutional members or units including a breaker.
A substation layout includes, as representative examples, one shown in a single line (connection) diagram of a single bus of
FIG. 20
, and one shown in a single line (connection) diagram of one and half bus (1·½) of FIG.
21
. In
FIGS. 20 and 21
, the switchgear apparatus corresponding to a portion surrounded by short dash-lines have similar structures, respectively, in which a breaker
20
and disconnectors
30
disposed on both ends of the breaker
20
are electrically connected in series. Reference numeral
90
denotes a transformer.
In general, in air substations, since bus and steel tower have long service lives, the bus or steel tower is less exchanged or replaced at a time of exchanging or replacing the switchgear apparatus. In this viewpoint, usually, the switchgear apparatus is replaced by another one having high performance and high reliability, while effectively utilizing an air insulating bus and the like already set in place.
In order to meet such needs, there has so far been proposed a hybrid (-type) gas insulation switchgear apparatus. As an example of hybrid gas insulation switchgear apparatus, a general hybrid gas insulation switchgear apparatus will be explained hereunder with reference to an illustration of FIG.
22
. The illustrated hybrid gas insulation switchgear apparatus corresponds to a portion shown with a dash-line portion in the single-line connection diagrams in FIG.
20
and FIG.
21
and is applicable to a double bus type bus connection, though not illustrated.
In other words, the breaker
20
in the hybrid gas insulation switchgear apparatus is operated by an operating mechanism
28
and is equipped with a stationary side electrode
21
and a movable side electrode
22
accommodated in an enclosure
81
. The breaker
20
is provided with both side portions to which disconnectors
30
a
,
30
b
accommodated in enclosures
82
a
,
82
b
are provided. The disconnectors
30
a
,
30
b
are constituted to be capable of being opened or closed (switched) by an operating mechanism
33
. The enclosures
82
a
,
82
b
are supported by a frame. The breaker
20
and the disconnectors
30
a
,
30
b
are connected through an adapter conductor
100
accommodated in a vessel.
On the enclosures
82
a
,
82
b
accommodating the disconnectors
30
a
,
30
b
, there are fitted the bushings
1
a
,
1
b
through the insulating spacers
63
, respectively, and the conductors
11
a
,
11
b
of the inside bushings are connected to the disconnectors
30
a
,
30
b
through conductors provided on the insulating spacers
63
. Further, an earth switches
4
a
,
4
b
are disposed between the adapter conductor
100
and the disconnectors
30
a
,
30
b
so as to be opened or closed by an operating mechanism
43
. Reference numerals
70
a
,
70
b
denote current transformers.
However, in the conventional hybrid gas insulation switchgear apparatus of the structures mentioned above, the breaker
20
and the disconnectors
30
a
,
30
b
are accommodated respectively independently in the separate enclosures
81
,
82
a
, and
82
b
. Accordingly, the entire size of the device is apt to become larger, the weight thereof is also apt to become heavier, and product price becomes higher.
SUMMARY OF THE INVENTION
An object of the present invention is to substantially eliminate defects or drawbacks encountered in the prior art mentioned above and to provide a hybrid (-type) gas insulation switchgear apparatus or system having a compact and simple structure, which can be easily maintained.
This and other objects can be achieved according to the present invention by providing a hybrid gas insulation switchgear apparatus comprising:
an enclosure in which an insulating gas is sealed;
a bushing unit provided for the enclosure;
a breaker unit disposed inside the enclosure;
a disconnector unit disposed inside the enclosure and including disconnectors to be connected electrically in series to both sides of the breaker unit;
an earth switch unit disposed inside the enclosure and including earth switches disposed between the breaker unit and the disconnectors, respectively, the earth switches being provided with main pole side electrodes disposed on the side of the breaker unit; and
a current transformer unit mounted to the enclosure,
the bushing unit including bushings each having a conductor connected to an electrode in the disconnector on a side opposite to the breaker.
According to this aspect, the breaker unit, the disconnector unit and the earth switch unit are accommodated in a single enclosure, and therefore, it is not necessary to use a long connecting conductors such as that required in a prior art. Accordingly, it is possible to realize a hybrid gas insulation switchgear apparatus having compact and light-weight size.
Hereunder, preferred embodiments of the present invention and their advantageous functions and effects will be described.
The conductor of the bushing and the electrode of the disconnector are supported and fixed in the enclosure by an insulating member having substantially a cylindrical or columnar shape.
In the above structure, since the conductor of the bushing is directly connected to one side electrode of the disconnector and it is supported in the enclosure by the cylindrical or columnar insulator, it is possible to reduce the number of parts of the connector, thereby making it possible to simplify the assembly working of the apparatus.
A gas space between the enclosure and the bushing unit is sectioned by an insulating member having substantially conical shape, and the electrode disposed on the side opposite to the breaker unit in the disconnector is supported by the insulating member.
According to this arrangement, the workability in the checking or inspecting time can be improved.
The enclosure is provided with at least one branch portion, the bushing unit is mounted to the branch portion and at least a set of disconnector and earth switch is accommodated in the branch portion.
In this structure, since the disconnector and the earth switch are accommodated in the branch portion, the direct exposure of the disconnector and the earth switch to the hot gas blown from the breaker at a time of breaking a large current can be prevented. Accordingly, it is possible to improve safeness. In addition, it is possible to shorten the size of the enclosure for accommodating the breaker.
The enclosure is disposed in a perpendicular direction with respect to a ground surface.
According to this arrangement, the installation area of the switchgear apparatus in the horizontal direction can be widely reduced, and moreover, the insulation distance to the ground of the bushing unit can be secured easily by the perpendicular arrangement of the enclosure.
Two branch portions are provided in different height levels. The direct exposure of the hot gas from the breaker unit at the time of the large current breaking can be prevented by this arrangement.
The two branch portions are provided symmetrically with respect to an axis of the enclosure at mutually different angles.
According to this arrangement, even if the portion accommodating the breaker unit in the enclosure is shortened, the air insulation distance of the bushing unit can be secured, and it is possible to realize the compact structure of the switchgear apparatus.
The breaker unit is driven by an operating mechanism provided on an extension of an axis of the electrode for the breaker unit.
According to this arrangement, it is possible to transmit the driving force of the operating mechanism linearly to the breaker unit, thus simplifying the structure of the driving unit.
The two branch portions are provided in perpendicular direction to the axis of the enclosure. Accordingly, the entire structure of the switchgear apparatus can be made compact and simplified
Arai Kenji
Furuta Hiroshi
Matsushita Kozo
Nakano Osamu
Ogata Kazutoshi
Enad Elvin
Fishman M.
Kabushiki Kaisha Toshiba
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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