JPH02290111A - Compressed-gas-insulated switchboard - Google Patents

Abstract

PURPOSE:To shorten the distance between each main bus, between each equipment for electric power and between these and the earth, and to reduce the setting space occupied per set of the switchboard getting a switchboard for high tension use to be a compressed gas insulated type. CONSTITUTION:Since insulating gas such as SF6 gas, etc., sealed in a tank 20 has greater dielectric strength than the air, sufficient insulation resistance is ensured even if the distance between each phase of each main bus 2... and each longitudinal bus line..., the distance between each equipment for electric power 11, 11, 12 and 13 and the distance between these and the earth are reduced shorter than before and the tank 20 is made small-sized. As the main buses 2... are provided near the bottom of the tank 20, the emitted heat caused by the conduction to the main buses 2... is transmitted to insulating gas 22 which will convect in the tank 20. Consequently, the emitted heat of the main buses 2... is radiated from the whole outer wall of the tank 20 by the convection of the insulating gas 22.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is applicable to, for example, 7. This relates to gas insulated switchboards such as 2Kv class.

[Prior art] Conventionally, 7. There were no gas-insulated switchboards for high pressure such as 2Xv class, and the switchboards were constructed in the atmosphere.

A conventional power distribution board for high voltage such as 7 or 2 Kv class constructed in the atmosphere will be explained with reference to FIG.

In FIG. 3, the conventional power distribution board includes a housing 8, a main bus line 2 installed almost horizontally on the top of the housing 8, a vertical bus line 3 installed almost vertically inside the housing 8, and a main bus line 2 installed at the rear of the housing 8. It consists of a cable head 5, a current transformer 7, etc. Power equipment such as circuit breakers are arranged in a stacked manner inside the housing 8 and are connected to the vertical bus 3 and the cable head 5 via connectors 4 and 6.

[Problems to be Solved by the Invention] Conventional high-voltage switchboards are constructed in the atmosphere as described above. It is necessary to keep a sufficient distance between The problem was that the installation space occupied by the Li board became large.

The present invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a gas-insulated switchboard that occupies a small installation space.

[Means for Solving the Problems] A gas insulated switchboard according to the present invention includes: a tank in which an insulating gas is sealed; a main bus bar provided almost horizontally near the bottom of the tank; A vertical path line installed almost vertically, multiple mounting sections provided above the main bus bar for mounting power equipment in a stacked manner inside the tank, and a state in which power equipment is installed on the mounting sections. It is equipped with a plurality of cable heads provided on the side wall of the tank so as to face each power device.

[Function] Power equipment such as main bus lines, vertical bus lines, and circuit breakers attached to the mounting parts must be filled with an insulating gas, such as S, inside the tank.
It is sealed together with F6 gas.

Insulating gas has a higher dielectric strength than air, so it is possible to shorten the distance between each main bus bar and vertical bus line, between each power equipment, and between these and the ground, while reducing the installation space occupied by the switchboard. Sufficient insulation is maintained. Furthermore, by arranging the main busbar at the lowest position, heat convection occurs inside the tank, and the heat generated by the main busbar is transmitted throughout the tank and radiated through the outer wall of the tank.

[Example] The gas insulated switchboard according to the present invention will be described with reference to FIGS. 2 and 3 showing an example thereof. FIG. 1 is a side sectional view showing the structure of a gas insulated switchboard, and FIG. 2 is a front sectional view thereof.

In the figure, an insulating gas 22 such as SF5 gas is sealed inside the tank 20, and an opening 20a of the tank 20,
20a is a lid 23. 23 hermetically closed.

Also, the lid 23. 23 are power equipment 11, 11, 12, such as circuit breakers, respectively. 13 etc., each power equipment 11, 11, 12. 13 is temporarily attached to the lid 23, 23 at the time of attachment. After this, each power equipment 11, 11, 12. 13 is opening 2
0a, inserted into the tank 20 from 20a, 123.
23 is installed at a predetermined position inside the tank 20 by being attached so as to close the openings 20a, 20a of the tank 20.

Here, the power equipment 11, 11 is, for example, a feeder breaker unit having a vacuum breaker, a disconnector, and the like. The power equipment l2 is, for example, a power receiving point LA-P having a lightning arrester (LA), a current transformer for measuring instruments (PT), a disconnector, etc.
It is a T unit. Further, the power equipment 13 is, for example, a power reception breaker unit having a vacuum breaker, a disconnector, and the like. Note that the combination and number of installed power devices are not limited to these. Each power equipment l1, 11, 12, 13
A circuit breaker drive device 9, a circuit breaker drive device 1G, etc. are provided as appropriate.

Each power device 11, 1 of the tank 20! ,12,! A cable head 5... is provided on the side wall facing the cable head 3. Power equipment that outputs power to the outside, e.g. 11, 11
and 13 are connected to the cable heads 5... through connectors 6..., respectively. Outside the tank 20, the cable head 5... is connected to a current transformer 7...
・ is provided.

On the other hand, a three-phase bus line 2 is provided at the bottom of the tank 20 so as to be approximately parallel (horizontal) to the ground, and a three-phase vertical bus line 3 is provided approximately vertically within the evening tank 20. is provided. Each main bus line 2... and each vertical bus line 3... are connected to each other, and each vertical bus line 3... is connected to a connector 4.
Each power device 11, 11, 12, 13 via...
It is connected to the. Furthermore, above 20, cable head 5
... etc. are housed inside the housing 21.

The insulating gas such as SF6 gas sealed inside the tank 20 has a higher dielectric strength than air, so each main bus bar 2
. . . and the distance between each phase of each vertical bus line 3 . Also, sufficient insulation is ensured. Also, main bus line 2...
is provided near the bottom of the tank 20, so even if the main bus bar 2 is energized, heat will not be transferred to the insulating gas 22.
It was conveyed to... Insulating gas 22 convects within tank 20 . Therefore, the heat generated by the main busbars 2 is radiated from the entire outer wall of the tank 20 by the convection of the insulating gas 22.

If you can secure the same installation space as before,
It goes without saying that the number of power devices housed in the tank 20 can be increased.

[Effects of the Invention] As described above, according to the present invention, the high-voltage switchboard is a gas-insulated switchboard, so the distances between each main bus bar, between each power device, and between these and the ground can be shortened. It has the effect of reducing the installation space occupied by each device on the distribution board.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an embodiment of a gas insulated power distribution board according to the present invention, FIG. 2 is a front sectional view thereof, and FIG. 3 is a sectional view showing a conventional power distribution board. In the figure, 2 is a main bus bar, 3 is a vertical bus line, 4 and 6 are connectors, 5 is a cable head, 11, 12, 13 are power equipment, 20 is a tank, and 23 is a lid.

Claims (1)

[Claims] (1) A tank that seals insulating gas inside, a main bus line installed almost horizontally near the bottom of the tank, a vertical bus line installed almost perpendicular to the main bus line inside the tank, and power equipment inside the tank. A plurality of mounting sections provided above the main bus bar for mounting the power equipment in a stacked manner, and a plurality of mounting sections provided on the side wall of the tank facing each power equipment when the power equipment is attached to the mounting parts. A gas-insulated switchboard equipped with a cable head and a cable head.