JPS631803B2 - - Google Patents

Description

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

Figure 1 shows an example of a single connection diagram of a conventional double-bus system of a sealed switchgear, and an example of a side view of the power receiving side, that is, the bank, and the power transmission side, that is, the line line in the single connection, with the conventional configuration. 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. In this configuration, an A branch bus 2A or an O branch bus 2B that is orthogonal to the A bus 1A or the O bus 1B is interposed, and a bank side A bus disconnector 3A or an O bus disconnector 3B and a line side A bus disconnector are connected at both ends. 4A or Otobus disconnector 4B (hereinafter referred to as
A disconnector (abbreviated as DS) is directly connected in a straight line,
Directly connect the bank side A-bus DS3A and Otsu-bus side DS3B, or the line side A-bus DS4A and Otsu-bus DS4B, and install the grounding device 6 or 6a (hereinafter referred to as the grounding device), respectively.
(abbreviated as ES) and bushing current transformer 9 or 9
a (Hereinafter, bushing current transformer will be abbreviated as BCT)
via the gas chamber disconnector 10 or 10a (hereinafter referred to as
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, DS12,
It is led to the overhead line via ES8 and Bushing 13. What is shown by dotted lines in the figure is the bridge groove 15, and each component device is supported by this bridge groove 15. In such a conventional structure, the bridge groove is omitted for downsizing, and a simple and economical closed type switchgear is required.

The present invention has been made in consideration of the above points, and
The purpose is to provide a closed type switchgear that is compact, simple, and economical by omitting the bridge grooves of busbars and disconnectors.

Hereinafter, the present invention will be described with reference to the drawings in which the same parts and parts having the same functions as those in FIGS. 1 and 2 are given the same reference numerals. In Figure 3, all equipment is configured as a three-phase type, and the double busbar 1
A and Otsu bus 1B are arranged vertically in a direction perpendicular to the plane of the paper, and the orthogonal A branch bus 2A and Otsu branch bus 2B of A bus 1A and Otsu bus 1B are arranged vertically on the power transmission side, that is, the line side and the power receiving side. In other words, the bank side disconnecting devices 20 and 20a are each directly connected, and the first bus 1A and the second bus 1B and the line side and bank side disconnecting devices 20 and 20a each constitute one side of a rectangle, and the second bus 1A and the first bus 1B are connected directly to each other. The disconnect device 20 and the disconnect device 20a are arranged to face each other. And on the line side, there is a disconnection device 20 on the line side.
Lower disconnect section 26 and ES6, BCT9 and GCB1
Connect 0 directly in a straight line horizontally. On the other hand, the bank side is connected to the lower 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 . Fix the bushing 23,
An insulating support member, for example, on both ends of the bushing 23,
The fixed electrodes 27 and 28 of the lower disconnection sections 25 and 26 are connected. Drive mechanism parts 29 and 3 are provided in disconnection parts 25 and 26 provided at both ends of the metal case 21, respectively.
The movable electrodes 33 and 34, which are directly connected to the drive mechanism parts 29 and 30 via the insulating rods 31 and 32, are arranged at positions facing the fixed electrodes 27 and 28, respectively. It has a structure that penetrates inside the movable electrode sliding parts 35 and 36 and moves up and down. The movable electrode sliding parts 35 and 36 are connected to connection conductors 37 and 38, and are fixed to the metal case 21 by insulating spacers 40, respectively. Further, the lower fixed electrode 28 is connected to a connecting conductor 41, and this connecting conductor 41 is fixed to the metal case 21 by an insulating spacer 42.

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. If a special insulating spacer such as a pleated insulating spacer that takes this phenomenon into consideration or a bushing as shown in the figure is used, the dielectric strength of the insulating member will not be adversely affected even if decomposition products are deposited. In the above-described embodiment, both fixed electrodes are supported by bushings, but both fixed electrodes may be supported by an insulating support member that is resistant to decomposition products, such as a special insulating spacer. Note that the movable electrode and fixed electrode are worn out due to loop current opening and closing, but when performing maintenance and inspection by opening and closing the specified number of times, the manhole 4
3, and when necessary, open the drive mechanism section 29,
By pulling out the fixed electrodes 27 and 28
Since the movable electrodes 33 and 34 can be maintained or replaced, the disconnection devices 20 and 20a
There is no need to remove it from the entire device. Therefore, the first bus and the second bus 1 of the disconnecting device 20, 20a
It can be used as a structure to support A and 1B.

Next, FIG. 4b shows a three-phase type, which has exactly the same configuration as the single-phase type described above.

With this configuration, the disconnecting devices 20, 20a
has a self-supporting structure, and there is no need for a large bridge groove in this part as in the conventional case.
It is only necessary to integrate the GCB 9a and the GCBs 10 and 10a, respectively, and to provide frames 17 and 17a for the gas insulator and disconnector.

Next, other embodiments of the present invention will be described in FIGS. 3 and 4.
The same parts as those in the figures will be described with reference to the drawings in which the same reference numerals are given. In Fig. 5, the main bus bar 1
A and Otobus 1B are of three-phase type, and other equipment is of single-phase type.

In addition, in Fig. 6, all the equipment is constructed of single-phase, and a single-phase type A branch is used to connect the main bus A bus 1A and O bus 1B with single-phase disconnect devices 20 and 20a, respectively. Bus 2A and Otsu branch bus 2B
is required, and Otobus 1B installed at the bottom.
Each phase is provided with legs 44 for fixing to the foundation.

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 are arranged on two opposing sides of a rectangle, and on the other hand, the first bus and the second bus are connected to the other By arranging them on two sides to form a rectangular shape when viewed from the side, and directly connecting them horizontally to a gas cylinder and disconnector having an opening in the axial direction, the disconnecting device has a self-supporting structure and can connect to the main busbar. This eliminates the need for overhead grooves for the busbar and busbar-side disconnect switch, and simplifies the configuration, meaning fewer components, improving reliability, making it economical, and reducing height. It is possible to provide a closed type switchgear which has effects such as being lower in size, smaller in size, and improved in seismic performance, and whose dielectric strength is not adversely affected even if decomposition products of an insulating gas are deposited.

[Brief explanation of the drawing]

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. 4a and 4b respectively show the disconnecting device of the present invention, a is a side view of the single-phase type, b is a side view of the three-phase type, and FIGS. 5 and 6 are respectively the main parts of the present invention. FIG. 7 is a side view showing another embodiment of the invention. 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 for disconnecting device, 17, 17a... Frame for 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, 44... Leg.

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. In this case, the first bus line and the second bus line are arranged horizontally and vertically parallel to each other, and a disconnecting device that functions as a disconnector is installed on the power transmission side and power receiving side circuit of the first bus line and the second bus line, respectively, and the power transmission side and the power receiving side are arranged perpendicularly to each of the busbars, and each of the disconnection devices connects two disconnection sections on the first busbar side and the second busbar side to an insulating support provided with a conductor supported by an insulating member. Coaxially connected to the first bus line and second bus line so as to be orthogonal to each other by a member, and the disconnecting device is made into an independent structure by a pedestal, and the disconnecting device and the bus bar are supported only by the pedestal. A closed type switchgear characterized by: