JPH0132609B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the construction of a closed switchgear filled with an insulating gas such as SF ₆ gas.

Figure 1 shows an example of a single line diagram of a conventional double busbar system of a sealed switchgear, and an example of a side view of the conventional configuration of the power receiving side, that is, the bank, and the power transmitting side, that is, the line line in this single line diagram. Shown in Figure 2. Figure 2 shows an example in which all the components are configured as single-phase type, with busbars A and B (hereinafter referred to as busses) installed in the upper center in a direction perpendicular to the plane of the paper shown in the diagram, and banks that are almost symmetrical. Circuits and line circuits are arranged. This configuration is Kobusu 1A
Or, interpose the A branch bus 2A or the O branch bus 2B orthogonal to the Otsu bus 1B, and the bank side A bus disconnector 3A or the Otsu bus disconnector 3B, and the line side A bus disconnector 4A or the Otsu bus at both ends. Disconnector 4B
(Hereinafter, the disconnect switch is abbreviated as DS) are directly connected in a straight line, and the bank side Ko bus DS3A and the Otsu bus side DS3
B, or line side Kobusu DS4A and Otobusu DS4B
are directly connected to each other, and the gas Disconnector 10 or 10a
(Hereinafter, the gas liner and disconnector will be abbreviated as GCB), and the bank side is further led from the cable head 14 to the power cable via the BCT 11a and the ES 7a. On the other hand, the line side is BCT11, ES7, DS1
2. It is led to the overhead line via ES8 and bushing 13. A frame 15 is indicated by a dotted line in the figure, and each component is supported by this frame 15. In other words, the bank-side upper bus, which is a horizontal disconnector that forms the first and second disconnectors,
The DS3A and the line side upper bus DS4A, and the bank side lower bus DS3B and the line side lower bus DS4B are stacked linearly in two stages in separate horizontal planes. For this reason, the first bus 1A and the first branch bus 2A are arranged between the bank side first bus DS3A and the line side first bus DS4A, and the first bank side bus DS3B
Otsu bus 1B and Otsu branch bus 2B are arranged between Otsu bus DS4B and line side Otsu bus DS4B. For this reason, horizontal disconnectors 3A, 4A, 3B, 4B and each bus 1
A, 2A, 1B, and 2B are located at high places, requiring a large installation area and requiring a long and strong frame 15 to support them. In such a conventional structure, the frame was omitted for downsizing, and a simple and economical closed type switchgear was required.

The present invention has been made in consideration of the above points, and
The purpose is to omit the structure of the bus bar and disconnector, and to provide an independent, downsized, simple, and economical sealed switchgear.

Hereinafter, the present invention will be described with reference to an embodiment shown in the drawings in which the same parts and parts having the same functions as those in FIGS. 1 and 2 are denoted by the same reference numerals. In Figure 3, all the equipment is configured in a three-phase configuration, with double busbars A-bus 1A and Otsu-bus 1B arranged vertically in a direction perpendicular to the plane of the drawing, and A-bus 1A and Otsu-bus 1B.
Each of the orthogonal A-branch bus 2A and O-branch bus 2B
and vertically arranged self-standing power transmission side, ie, line side, and power receiving side, ie, bank side disconnection devices 20, 20.
The first bus 1A and the first bus 1B and the disconnecting devices 20, 20a each constitute one side of a rectangle and are connected in a loop shape, and the first bus 1A and the first bus 1B are connected in a loop.
The disconnect device 20 and the disconnect device 20a are arranged to face each other. The disconnection devices 20 and 20a have first and second disconnection sections 2 above and below the vertical cut, respectively.
5, 26 (see Figure 4 a, b). and,
On the line side, the second
The disconnecting section 26 of the ES 6, the BCT 9, and the GCB 10 are directly connected horizontally in a straight line. On the other hand, the bank side is connected to the lower second disconnection section 26 of the bank side disconnection device 20a.
Directly connect ES6a, BCT9a and GCB10a horizontally in a straight line.

Next, the disconnect device 20 on the line side is a single-phase type as shown in _FIG . The bushing 23 is fixed, and fixed electrodes 27 and 28 of first and second disconnection sections 25 and 26 provided above and below, respectively, are connected to both ends of the insulating support member, for example, the bushing 23. The first and second
Drive mechanism parts 29 and 30 are attached to the disconnection parts 25 and 26, and the movable electrode 3 is directly connected to the drive mechanism parts 29 and 30 via insulating rods 31 and 32.
The movable electrodes 33, 34 penetrate the inside of the movable electrode sliding parts 35, 36 and move up and down. The movable electrode sliding parts 35 and 36 are connected to connection conductors 37 and 3 through lead parts 25a and 26a, respectively.
8 through insulating spacers 40, respectively.
It is fixed to a metal case 21. Further, the lower fixed electrode 28 is connected to the connection conductor 4 through the lead portion 26b.
1, and this connecting conductor 41 is fixed to the metal case 21 by an insulating spacer 42.
The lower end of the metal case 21 is fixed to the frames 16, 16a (see FIG. 3).

The bus side disconnector of the double busbar system is required to have the ability to open and close the loop current when switching the busbars. When the loop current is switched on and off in this manner, decomposition products of the enclosed insulating gas are generated, and when these products are deposited on the surface of the insulating member, the dielectric strength of the ordinary insulating member is reduced. Insulating spacers that take this phenomenon into account, such as pleated insulating spacers, or bushings 23 that are tapered vertically and have a long creepage distance, as shown in the figure, can provide insulation even if decomposition products accumulate. The dielectric strength of the component is not adversely affected, and the latter does not accumulate decomposition products, so
Again, dielectric strength is not adversely affected. In the above embodiment, both fixed electrodes are supported by bushings 23, but both fixed electrodes may be supported by insulating spacers (not shown) that are resistant to decomposition products. In addition, the movable electrode 3 is
3, 34 and fixed electrodes 27, 28 are consumed,
When performing maintenance and inspection by opening and closing a specified number of times, open the work opening, for example, the handhole or manhole 43, and when necessary, pull out the drive mechanism parts 29, 30 to remove the fixed electrodes 27, 28 and the movable electrode 3.
There is no need to remove this disconnecting device 20, 20a from the entire system since 3, 34 can be serviced or replaced. Therefore, disconnection device 2
It can be used as a structure to support the A-bus and O-bus 1A and 1B of 0 and 20a. Note that drive mechanism parts 29 and 30 are provided at the shaft ends of both movable electrodes 33 and 34, respectively, but in the direction perpendicular to the movable electrodes 33 and 34,
That is, the drive mechanism parts 29 and 30 may be provided in the opposite direction to the manhole 43, respectively.

Next, FIG. 4b shows a three-phase disconnecting device, which has the same configuration as the single-phase device described above, except that there are only three circuits.

With this configuration, the disconnecting devices 20, 20a
has become a self-supporting structure (see Figure 3), and there is no need for a large frame like in the past for this part, and the disconnection device 2
0 and 20a are stand-alone frames 16 and 16a, respectively.
It is only necessary to integrate the BCTs 9, 9a and GCBs 10, 10a, respectively, and to provide stands 17, 17a for self-standing. Since the disconnecting sections 25 and 26 are cut vertically, the installation area can be further reduced.

As explained above, according to the present invention, in the dual-drawer type arrangement of the double bus bar system, two sets of disconnecting devices that function as the first and second disconnecting sections above and below the vertical cut are connected to two sets of rectangular opposed disconnecting devices. On the other hand, the A-busu and Otsu-busu are placed on the other two sides, and they are connected in a rectangular loop shape when viewed from the side, and are horizontally connected to the gas shield and disconnector that have an opening in the axial direction. By configuring it in a direct connection, the disconnecting device with a self-supporting structure supports the main busbar, so the structure of the busbar and the busbar side disconnector is unnecessary, and the configuration is simplified, that is, the number of component parts is reduced. It is more reliable and therefore more economical and has a lower height.
Since the disconnect section is cut vertically, the installation area is reduced.
It is possible to provide a closed type switchgear that has effects such as improved seismic performance and whose dielectric strength is not adversely affected even if decomposition products of an insulating gas are deposited.

[Brief explanation of drawings]

Fig. 1 is a single line diagram showing a general double-bus type enclosed switchgear, Fig. 2 is a side view showing the main parts of a conventional enclosed switchgear, and Fig. 3 is an enclosed switchgear of the present invention. FIGS. 4a and 4b are side views showing essential parts of the disconnecting device of the present invention, where a is a side view of a single-phase type and FIG. 4b is a side view of a three-phase type. 1A, 1B...A and Otsu bus, 2A, 2B...
A and O branch busses, 3A, 3B... Bank side A bus and Otsu bus disconnector (DS), 4A, 4B... Line side A bus and Otsu bus disconnector (DS), 6, 6a,
7, 7a, 8... Earthing device (ES), 9, 9a, 1
1, 11a...Bushing current transformer (BCT), 1
0, 10a...Gas cutter (GCB), 12...
Disconnector (DS), 13... Bushing, 14... Cable head, 15... Frame, 16, 16a...
Frame of disconnecting device, 17, 17a... Frame of gas cylinder disconnector, 20, 20a... Disconnecting device, 21... Metal case, 23... Bushing, 25, 26...
Disconnection section, 27, 28... Fixed electrode, 29, 30...
... Drive mechanism section, 31, 32 ... Insulation rod, 3
3, 34...Movable electrode, 35, 36...Movable electrode sliding part, 37, 38, 41...Connection conductor, 40,
42... Special insulating spacer, 43... Manhole.

Claims (1)

[Claims] 1 Enclosed type switchgear that is orthogonal to the A and B bus lines of double-bus type switchgear equipment and is equipped with a power transmitting line on one side and a power receiving line on the other side with these two bus lines as an axis of symmetry. , the A bus line and the O bus line are arranged horizontally and vertically parallel to each other, the A branch bus line is connected to the A bus line horizontally and orthogonally to the A bus line, and the A branch bus line is connected to the A bus line and the A branch bus line is horizontal and is below the A bus line. In addition, the O branch bus bar that is orthogonal to the O branch bus bar is connected, and the ends of the A branch bus bar and the O branch bus bar on the same side are connected in a loop with a vertically arranged disconnection device on the power transmission side and a disconnection device on the power reception side, respectively. , the disconnection device on the power transmission side is configured by storing first and second vertical disconnection sections connected in series, one side of which is connected to the first bus line side and the second bus side, respectively, at the top and bottom of the metal case. Connecting the other common side of the first and second disconnection sections to the power transmission side line equipment via a gas shield and disconnector horizontally arranged on the side of the second disconnection section opposite to the O branch busbar,
The disconnection device on the power receiving side is configured by storing first and second vertically disconnected disconnection sections connected in series, one side of which is connected to the first bus line side and the second bus side, respectively, at the upper and lower sides of the metal case. and the other common side of the second disconnection section is connected to the power receiving side line equipment via a gas shield and disconnector horizontally arranged on the side of the second disconnection section opposite to the O branch bus bar, and the power transmission side A closed type switchgear characterized in that the disconnecting device and the power receiving side disconnecting device are each made into a self-supporting structure by a pedestal, and both the disconnecting device and the bus bar are supported only by the pedestal.