JPH0152962B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to low pressure gas insulated electrical equipment. Recently, studies have been progressing on low-pressure gas-insulated electrical equipment in which a box-shaped container is filled with low-pressure insulating gas and the required electrical equipment is housed inside. This device has a simple external structure and is environmentally friendly.

By the way, there may be cases where it is desired to consider this device as one unit and add other units to its side to increase the degree of freedom in layout.

The present invention was proposed in response to such demands, and will be described below based on embodiments shown in the drawings.

In the figure, reference numeral 1 denotes a metal main body container having an airtight structure and supported on a base 2 via a pedestal 3 at a predetermined height. This main container 1 includes a rectangular bottom plate 1a,
Front and back plates 1 arranged along the four circumferences of the bottom plate 1a
It is formed into a box shape having side plates 1c, 1e and a ceiling plate 1f, and is divided into a breaker chamber 4 and a lead-in chamber 5 by providing a partition plate 1g as necessary.
Each chamber is filled with an insulating gas 6 such as SF ₆ gas or a mixed gas at a low pressure of, for example, less than 2 kg/cm ² ·g.

Equipment is housed within the main container 1 according to the single line diagram illustrated in FIG. That is, the drawing room 5
Includes cable head CHd, lightning arrester LA, and disconnect switch.
DS ₁ , earthing device ESW ₁ , and disconnector room 4 have current transformer CT, disconnector CB, disconnector DS ₂ , and earthing device.
ESW ₂ and ESW ₃ are stored respectively. The disconnector DS ₁ is connected to the disconnector CB via a through-wall bushing B. Each of these devices is the main container 1
The in-phase components are arranged in substantially the same plane in the X-axis or Y-axis direction (in the figure, the X-axis direction), and the three-phase components are arranged in parallel (in the figure, in the Z-axis direction). (Figure 1 shows only one phase of these devices.) The power receiving unit configured in this way is connected to other units such as an instrument transformer unit and a transformer primary unit. The bus conductor BUS is housed in the disconnection chamber 4. The conductor Bus is arranged in a direction perpendicular to both side plates 1c and 1e (in the figure, the Z-axis, that is, the front and back direction of the figure), and has three phase components.
BusA, BusB, and BusC are arranged on one imaginary line at an angle of approximately 45 degrees to the Each conductor is made to directly face the surfaces of the ceiling panel 1f and the back panel 1d without placing any equipment or the like. One end of this bus conductor BUS is connected to an insulating spacer 8A attached to the side plate 1c,
It is insulated and supported by 8B and 8C. The other end is a disconnector
Auxiliary busbars 9A, 9B attached to each phase of DS ₂ ,
It is supported and connected to 9C. Of course the bus conductor BUS _A
~BUS _C may be supported by extending the other end and attaching an insulating spacer to the side plate 1e.

Each of the above-mentioned disconnectors DS ₁ , DS ₂ , earthing device ESW ₁ ~
Operating mechanisms such as the ESW ₃ and the breaker CB pass through the bottom plate 1a and are connected to an operating device disposed between the bottom plate 1a and the base 2. In addition, the grounding wire of the lightning arrester LA,
Lead wires such as ground wires of the grounding devices _ESW1 to _ESW3 also pass through the bottom plate 1a and are led to the equipment box disposed between the bottom plate 1a and the base 2. The space between the bottom plate 1a and the base 2 is covered with a decorative board 7 as required.

Therefore, when changing the layout by adding an instrument transformer unit and a primary transformer unit to the unit shown in Figure 1, the bus conductor
From BUS _A to BUS _C , the first branch conductors 11A, 11B, 11C, and the second
Branch conductors 12A, 12B, and 12C are derived, respectively. These branch conductors are the back plate 1d and the ceiling plate 1f.
Insulating spacers 13A to 13C, 1 attached to
4A to 14C are insulated and supported. Instrument transformer units PT _A to PT _C are attached to the upper surface of the ceiling plate 1f, and the transformers are connected to the second branch conductors 12A to 12.
Each is connected to C. Further, a transformer primary unit 16 containing a disconnector DS ₃ , a grounding device ESW ₄ , and a transformer connection bushing 15 is attached to the side surface of the back plate 1 d, and the first branch conductor 11
A to 11C are connected to each phase of the disconnector _DS3 .

In this way, the transformer primary unit 16 and the instrument transformer unit PT are connected, and the single line diagram is as shown in FIG. 4.

It is also possible to lead out the bus conductors BUS _A to BUS _C from the side plate 1C or 1e of the power receiving unit shown in FIG. 1 and connect other units thereto.

The bus conductor and the branch conductor may be insulated and supported by bushings, if necessary, in addition to insulating spacers.

As detailed above, according to the present invention, the three-phase busbar conductors are arranged in a direction perpendicular to both side plates, and are arranged on one imaginary line at an angle of approximately 45° to the X axis. Moreover, since no other electrical equipment is disposed between the bus conductor and the parallel ceiling plate and back plate, conductors can be easily drawn out to the ceiling plate and the back plate using straight conductors. In addition, the busbar conductor connections between units must be supported with bushings or insulating spacers to support the conductor or separate the gas. The distance between the phases of the bus conductor must be increased by the dimension of the flange part, and the approximately 45° arrangement minimizes the insulation distance between the phases between the bus conductor and the branch conductor, and also provides insulating spacers, etc. at the unit connection part. This makes it possible to install the device, which is extremely convenient. If the bus conductor is arranged parallel to the X-axis or Y-axis, the dimensions of the flange portion between the phases will not be sufficient, so the space occupied by the bus conductor will become large, and it will not be possible to draw out the bus conductor in the same direction as the arrangement direction. It's complicated and difficult to do. However, the present invention has no such disadvantages and produces remarkable effects.

[Brief explanation of drawings]

Fig. 1 is a simplified side sectional view showing one embodiment of the present invention, Fig. 2 is a single line diagram of the one in Fig. 1, and Fig. 3 is a drawing of the one in Fig. 1 with other units added. A is a top view, B is a simplified side sectional view, and FIG. 4 is a single line diagram of the one shown in FIG. 3. 1: Main body container, BUS: Bus conductor, 1c, 1
e: side panel, 1d: back panel, 1f: ceiling panel.

Claims (1)

[Scope of Claims] 1. A low-pressure gas insulated device in which required electrical equipment is housed in a box-shaped metal main body container filled with low-pressure insulating gas, and has three-phase busbar conductors connected to the corresponding phases of these electrical equipment, respectively. In electrical equipment, the three-phase busbar conductors are arranged in a direction perpendicular to the side plate of the main container. The three-phase busbar conductors are arranged on one imaginary line at an angle of approximately 45° to the X-axis. The above three-phase bus conductors shall be arranged parallel to the ceiling plate and back plate of the main container. The three-phase busbar conductors mentioned above directly face the ceiling panel and back panel. A low-pressure gas-insulated electrical device characterized by meeting the above requirements.