JPH0348721B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a gas insulated switchgear using an insulating gas such as SF ₆ gas, and more particularly to a gas insulated switchgear using an insulating gas such as SF 6 gas. Pertains to.

[Technical Background of the Invention] In order to determine power supply, a double bus 4-bus die system is often adopted in large-capacity substation equipment. In this system, there are two bus systems, and each bus system itself is divided into four or three units to accommodate power as needed, thereby improving the reliability of the entire substation.

A single line diagram of this double busbar four bus die type gas insulated switchgear is shown in FIG. That is,
The main bus bar 1a constituting the first unit of the double bus bar,
1b is connected to the double busbars 2a, 2b of the adjacent second unit via the busbar section 10.
A line-feeter switchgear 3 and a bank-feeter switchgear 4 are connected to the double busbar of each of these units, one end of the line-feeter switchgear 3 being connected to the power transmission line, and one end of the bank-feeter switchgear 4 being connected to a transformer. ing. Furthermore, a bus line 5 is provided between the double busbars in each unit.

On the other hand, the busbar division section 10 includes a bow disconnector 11a on the a busbar side, disconnectors 12a and 13a, and a subbusbar 1
4a and b busbar side sheath disconnector 11b, disconnector 12
b, 13b and a sub-bus 14b. As shown in FIG. 2, these busbar section sections 10 are all housed in a closed container filled with insulating gas.

In this case, when connecting the main bus bar 1a on the first unit side and the main bus bar 2a on the second unit side on the a bus side, as shown in FIG. Three single-phase busbars 15a are pulled out from the disconnector 12a provided in It was connected to the provided disconnector 11a. and,
From this shingle disconnector 11a, the single-phase bus 15a is passed over the main bus 1b and the sub-bus 14b again.
was extended and connected to the sub-bus 14a on the a-bus bar side provided on the opposite side of the main bus 1a. Furthermore, this sub-bus 14a is connected to the a-bus 2a on the second unit side via a single-phase bus 15a and a disconnector 13a, as shown in FIG.

On the other hand, on the b bus side, as shown in Fig. 3, three disconnectors 1 are installed at the end of the main bus 1b of the first unit.
2b were provided, and a single-phase bus 15b was connected to each of these disconnectors 12b, which was connected to a three-phase collective type sub-bus 14b. In addition, this sub-bus 14
The end of b on the second unit side is connected to the single-phase bus 15b to the upper part of the sub-bus 14b, as shown in FIG. 11b, the single-phase bus 15b extending from this shear disconnector 11b is connected to the sub-bus 14b.
A disconnector 13b extends beyond the upper part of the main bus bar 2b on the second unit side and is provided at that part.
It was connected to the main bus 12b via.

[Problems in the Background Art] However, in such conventional gas-insulated switchgear, all the disconnectors are placed above the main busbar, so the disconnection line The disconnect switch for the other bus was mixed in with the other bus, resulting in a complicated arrangement. That is, when looking at the arrangement of each switching device along the longitudinal direction of the main bus, as shown in FIG. A container 12b is provided,
On the other hand, on the other hand, the disconnector 13b on the busbar side B and the disconnector 1
A disconnector 13a on the a busbar side was provided at the same position as 4b. In this way, if disconnectors and disconnectors are mixed along the longitudinal direction of the busbar, there is a risk of incorrect operation of the disconnector, incorrect maintenance and inspection of each of these devices, and furthermore, However, it also had the disadvantage of complicating the gas classification of each device. In addition, if a disconnect switch is always provided above the main bus, the connection between the main bus and the sub-bus will inevitably be in a vertical U-shape as shown in Figures 3 and 4. The installation position of the shear breaker 11a on the a busbar side was a high place, which also had the disadvantage of requiring special consideration for earthquake resistance.

[Object of the Invention] The object of the present invention is to overcome the drawbacks of the conventional gas insulated switchgear as described above, and to
It is possible to place the disconnectors and bow breakers for the busbar and busbar B in clearly separated positions, and the placement position of the bowbreak switch on the a busbar side and the single-phase busbar connected to it is low. The object of the present invention is to provide a gas insulated switchgear that achieves improved earthquake resistance.

[Summary of the Invention] The gas insulated switchgear of the present invention provides a disconnect switch at the main bus end of one unit, and also provides a disconnect switch at the end of the sub bus that connects this main bus end. , Disconnectors and bow breakers are arranged centrally on the end side of one main busbar, thereby arranging the switchgear on the a busbar side and the switchgear on the b busbar side in separate positions. It was made so that it could be done.

[Embodiment of the Invention] Next, an embodiment of the present invention will be specifically explained with reference to FIG. 5 and the following drawings. Note that the same members as those of the conventional type will be described with the same reference numerals.

In this embodiment, three disconnectors 12a are provided at the end of the main bus 1a on the first unit side of the a bus, and from these disconnectors 12a, a single-phase bus 15a and a disconnector are respectively connected. It has been extended towards 11a. This edge disconnector 11a is provided on the opposite side across the main bus 1b on the b busbar side and its connecting sub-bus 14b, and the single-phase bus 15a extending from the disconnector 12a is connected to the main bus 1b and the sub-bus 14b. 14b. Further, a single-phase bus 15a is extended from this sheath disconnector 11a so as to straddle the sub-bus 14b, the main bus 1b, and the end of the main bus 1a on the a-bus side, and this single-phase bus 15a
is connected to a disconnector 13a provided at the end of the sub-bus 14a for connection to the a-bus. The end of the sub-bus 14a on the second unit side is connected to the end of the main bus 2a on the second unit side.
They are connected via a horizontal connection part 16. This horizontal connection is constructed by rearranging the internal conductors 17 of the three-phase collective bus so that they face each other.

On the other hand, on the b bus side, the first
The end of the unit and the end of the sub-bus 14b for connection to the b-bus are connected via a horizontal connection 16. A disconnector 12b is provided upward at the end of the sub-bus 14b on the second unit side. They are connected via a single-phase bus 15b. Furthermore, a single-phase bus 15a is extended from the breaker 11b so as to cross over this sub-bus 14b, and the tip of this single-phase bus 15a is connected to a disconnection provided above the main bus 2b on the second unit side. 13b.

Regarding the bus tie line 20 of each unit, as shown in FIG. are connected by a single-phase bus 23. Since this is the same line as the connection line between the sub bus 14b and the main bus 2b shown in FIG. 7, the same parts as this line can be used for the bus tie line 20, making it possible to standardize the parts. can.

In this way, in this embodiment, the first unit side end of the b bus bar and its connecting sub bus bar are horizontally connected, and no disconnector is provided in this part. Main bus bar 1b and sub bus bar 14b
The position of the single-phase bus 15a on the A bus side to overcome the
It becomes possible to install a at a low position. In addition, by providing a disconnector at the end of the sub-bus, it is possible to centrally place all the disconnectors and cable disconnectors at one end of the main bus, so each device on the a-bus It is now possible to separate and arrange each switching device for each bus bar, such as placing the switchgear at the end of the first unit side for the B busbar, and the end of the second unit side for each device on the B busbar side. .

[Effects of the Invention] As shown in the above embodiments, the present invention has a configuration in which the disconnect switch is arranged on the sub-bus side, so that each switching device such as a front disconnector and a disconnect switch is arranged separately for each bus bar. Therefore, there is an advantage that operations such as operation inspection and maintenance of each of these switching devices can be performed completely and reliably. In addition, by horizontally connecting the busbars and providing the disconnector on the sub-bus side, there is no protrusion on the busbar surface at one end of the main busbar, and as a result, the busbar is not affected by the protrusion and the disconnector is not affected by the protrusion. Since it is possible to lower the position of the single-phase bus bar for connecting the switch and the switch, it is possible to improve the seismic resistance of the switch as a whole. Furthermore, by horizontally connecting the busbars, the length of the single-phase busbar that connects each busbar and switching equipment can be shortened. Since the bus tie line can be configured by using the same parts as in the previous configuration, it is possible to simplify the structure of the entire switchgear and reduce costs by reducing the number of parts.

[Brief explanation of drawings]

Fig. 1 is a single line diagram of a gas insulated switchgear employing a double busbar 4 bus tie system, Fig. 2 is a plan view showing the bus bar section in a conventional gas insulated switchgear, and Fig. 3 is a Cross-sectional view of the line, No. 4
The figure is a cross-sectional view taken along the same line as above, and FIG. 5 is a plan view showing a positional example of the gas-insulated switchgear of the present invention.
FIG. 6 is a cross-sectional view taken along the line shown in FIG. 1a... Main bus bar on the first unit side of the a bus bar, 2
a...The main bus bar on the second unit side of the a bus bar, 1b...
...B main bus bar on the first unit side of bus bar, 2b...b
Main busbar on the second unit side of the busbar, 3... Line feeder switchgear, 4... Bank feeder switchgear, 5, 20... Bus tie line, 10... Busbar section, 11a, 11b... Sheath disconnector, 12a ,1
2b, 13a, 13b...disconnector, 14a...a
Subbus line on the bus side, 14b...Subbus line on the b bus side.

Claims (1)

[Scope of Claims] 1. A gas-insulated switchgear in which a double bus bar constituting a first unit and a double bus bar constituting a second unit are connected via a bus bar segment, wherein the bus bar segment is connected to each bus bar segment. It has a pair of sub-busbars connecting the double busbars of the units, and a sheath breaker is provided outside these sub-busbars and said double busbar, and the end of one sub-busbar on the first unit side is connected to this end. It is connected to the main bus bar through a horizontal connecting part connected to a horizontal opening part formed in the section, and a disconnect switch is provided at the end of the sub bus bar on the second unit side. It is connected to a disconnector provided at the end of the main bus on the second unit side via the shield disconnector, and on the other sub bus, a disconnector is provided at the end on the first unit side, This disconnector is connected to the disconnector provided at the end of the main bus bar on the first unit side via the breaker, and the end of the other sub bus bar on the second unit side is connected to this end. A gas insulated switchgear characterized in that the gas insulated switchgear is connected to a main bus bar on the second unit side via a horizontal connection part connected to the formed horizontal outlet part.