JPH0152961B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to low pressure gas insulated switchgear (hereinafter referred to as low pressure GIS).
related to).

Recently, the main circuit components of electrical stations have been insulated with gas to make them more compact, but in the past, as a general rule, insulating gas was applied to each component at a rate of 3 to 4 kg/cm ²・g.
It is housed in a metal pressure vessel filled with water, and these are connected one after another. For this reason, the structure of the container is complicated, and the appearance is rugged and mechanical, which tends to give an unnecessarily intimidating feeling to the environment.

In view of this, the present invention rationally arranges each component of a two-line power receiving and disconnection type unit in a box-shaped container filled with low-pressure gas, and its purpose is to simplify the structure of the container. Our goal is to provide a device that is strong, easy to design, and has an excellent appearance. The following description will be made based on the embodiments shown in the drawings.

FIG. 1 is a simplified plan sectional view showing one embodiment of the present invention, FIG. 2 is a simplified sectional front view thereof, and FIG. 3 is a partially sectional simplified side view thereof. In these figures, 1
is a metal body container having an airtight structure and supported at a predetermined height on a base 2 made of concrete via a pedestal 3.

This container 1 is formed into a box shape having a rectangular bottom plate 1a, side plates 1b to 1e arranged along the four circumferences of the bottom plate 1a, and a ceiling plate 1f, and partition plates 1g and 1h are provided as necessary. , a disconnector chamber 4, and a disconnector chamber 5 ₁ 5 ₂ , and each chamber is filled with an insulating gas 6 such as SF ₆ gas or mixed gas at a low pressure of less than 2 kg/cm ² ·g. There is.

Equipment is housed in the container 1 according to the single line diagram shown in FIG. Figure 4 shows 2-line power reception 1
An example of the cable disconnection method is shown, where CHd ₁ and CHd ₂ are cable heads, CT ₁ and CT ₂ are current transformers, and DS ₁ and
DS ₂ is a disconnector, ESW ₁ and ESW ₂ are earthing devices, LA ₁
and LA ₂ are earth protectors, VD ₁ and VD ₂ are voltage detectors, and subscripts 1 and 2 indicate those for the first line 1L and the second line 2L, respectively. In addition, the power supply side and load side grounding devices for CB breakers and disconnectors, ESW ₃ and ESW ₄ breakers and disconnectors, B are transformer connection bushings, T
is a three-phase transformer placed on the side of the main container 1.

As shown in FIG. 2, the three phases of the breakers and breakers CB are arranged in the center cutter chamber 4 on or near the center line X-X' in the longitudinal direction of the container 1. It is set up. In addition, there are two power receiving lines, namely the cable head.
CHd ₁ and CHd ₂ are connected to the disconnector chambers 5 ₁ and 5 ₂ at both ends of the container 1.
The bottom plate 1a of the container 1 is disposed so that the three phases are parallel to the line Y-Y' perpendicular to the line X-X'.
The lightning arrester is drawn in from below through the airtight
LA ₁ and LA ₂ are cable heads CHd ₁ and
They are inserted and arranged facing each other from the top on the axis of CHd ₂ ,
Furthermore, disconnectors DS ₁ and DS ₂ are respectively provided inside thereof in parallel with the axis that connects the three phases of the cable head.

Further, a communication bus bar 7 is provided above the bottom breaker CB, and the connection between the bottom breaker CB and the disconnectors DS ₁ and DS ₂ is performed.

The transformer connecting bushing B is pulled out from the container side plate 1C in the Y-Y′ axis direction, and the corresponding shingle disconnector is pulled out.
They are connected to the lower terminals of the CB by connecting conductors 8, respectively.

When the partition plates 1g and 1h are provided, the disconnector chambers 5 ₁ and 5 ₂ are distributed on both sides of the disconnector chamber 4, and the partition plates 1g and 1h are provided with through holes 9 and 10 of the same diameter.
is provided, and this hole is filled with an insulating spacer 1 if necessary.
1 is sealed. Therefore, the gases in the chambers 4, 5 ₁ and 5 ₂ can be freely divided.

Earthing device ESW ₁ below disconnector DS ₁ , DS ₂ ,
ESW ₂ is installed for each of the three phases.

The shield breaker chamber 4 is provided with grounding devices ESW ₃ and ESW ₄ , whose movable contacts are attached to the intermediate plate 1i supported by the side plate 1e, and connect the power supply side and load side of the shield breaker CB. Configured to be grounded.

In the space 12 between the bottom plate 1a and the base 2, there are a cutter, a disconnector operator box 13, a disconnector operator box 14, 15,
Grounding device operating boxes 16 and 17 on the power receiving side and grounding device operating boxes 18 and 19 at both ends of the breaker are arranged,
They are arranged in a central location. Also, in this space there is a disconnector operating mechanism section 20, a disconnector operating mechanism section 2
1, 22 earthing device operating mechanism section 23, 24, 25,
26 are led out through the bottom plate 1a in an airtight manner, respectively, and are connected to the internal mechanisms of the corresponding operating device boxes.

The shield breaker CB is a type of gas shield which can inspect the inside of the container 1 without breaking its airtightness, and the operator box 13 is disposed from the front so that it can be led out into the space 12 for inspection. ing. In the embodiment described above, the operating mechanism section 20 attached to the bottom plate 1a
By removing the lower drawer, inspection of the lower drawer can be carried out using the space between the three-phase transformer T and the main body container 1.

Capacitor voltage divider type voltage detectors VD _{1 and} VD ₂ are installed on the side plate facing the conductors of the live parts of the cable heads CHd 1 and CHd ₂ .

Handballs 35, 36, 37 are provided on the side plates 1d, 1b and ceiling plate 1f of the container for checking, connecting, etc. the stored equipment, and are normally sealed with a blind lid.

The cable heads CHd ₁ and CHd ₂ are the cable 3
8 and 39, respectively, and introduced into each cable pit 40 and 41.

The cable heads CHd ₁ , CHd ₂ and the lightning arrester LA,
It is convenient to use self-interlocking contacts between LA ₂ .

Each device disposed in the lower space 12 is partially or entirely covered with a decorative board 42 as necessary so that the unevenness is not visible.

Incidentally, the ground may be excavated and the position of the base 2 may be lowered so that only the main container 1 appears on the surface of the ground, and by doing so, the decorative board can be omitted in many cases.

Furthermore, if the three-phase transformer T is located apart from the GIS, the bushing B may be omitted and a cable connection may be used. In this case, it is convenient if the cable head passes through the bottom plate 1a in a hermetically sealed manner so that the cable can be guided into the lower space 12.

If a bushing is used instead of a cable, a lightning arrester LA is installed at the cable head position, and a bushing is installed at the lightning arrester position.

As described in detail above, each device is symmetrical with the time cutter and disconnector in the center according to the present invention, so the GIS
The container is simple, strength design is easy, and equipment and busbar shapes can be standardized, reducing the number of parts. The container used is box-shaped.
Coupled with the simplification mentioned above, the appearance of GIS is even better and it is possible to harmonize with the environment. Furthermore, since the lead-in wire section is located at the outermost side of both ends, when assembling the GIS, this section can be done later, and when assembling disconnectors, etc., the space in this section can be used as is, which improves work efficiency. Does not require extra space for assembly.
In addition, since the lead-in line portion is disposed on the outermost side, a sufficient work space can be secured, and the lead-in work, whether cable lead-in or bushing lead-in, is easy to carry out.

In addition, as in the example, the container is supported at a constant height, and all equipment that needs to be operated from the outside, such as the disconnector, disconnector, and grounding device, is placed in the center, and the operating mechanism is mounted on the bottom plate of the container. When leading out directly below through airtight penetration, the operator box, control device, etc. can be arranged in the center of the device, making operation and maintenance easier, and each operator box, etc. can be placed flush with the side plate of the main container. Since it is a single unit, the installation area is reduced and the appearance is simple and aesthetically improved. Furthermore, when the breaker is taken out into the space below the bottom plate without breaking the airtightness of the container, and when each phase is installed in parallel to the rear space, the space between the three-phase transformer and the main container must be can be used as is, and inspection of each phase is easy.

In addition, when providing a partition plate as in the example,
Utilizing this, it is possible to easily install a disconnector on the power receiving side and to partition the gas between each chamber as necessary, and the partition plate also serves as reinforcement for the container, making it possible to reduce the weight of the container. When a cable head and a lightning arrester are placed opposite each other, if the power is received by air bushing, this can be handled by installing the lightning arrester in the opposite direction instead of the cable head, and there is no need to change the design of the container or the like. When handballs are installed on both sides of the container and on the head of the shredder, it is easy to assemble and inspect the GIS. In addition, when leading out the connecting bushings to the transformer from the rear side wall of the shield breaker, connect each upper butterfly of the shield breaker to the communication bus bar above the shield breaker, and connect the connecting conductor from each lower terminal. Since it is carried out through the bushing, a wide space is obtained in the vertical direction, and the bushing can be drawn out from any position.
This makes it easier to connect to a transformer.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, in which Fig. 1 is a simplified plan sectional view, Fig. 2 is a simplified sectional front view thereof, Fig. 3 is a partially sectional simplified side view, and Fig. 4 is Fig. 2-3. It is a single line diagram of what is shown in FIG. 1: Main container, 6: Insulating gas, CB: Heat breaker,
DS ₁ , DS ₂ : Disconnector, ESW ₁ to ESW ₄ : Earthing device,
LA ₁ , LA ₂ : Lightning arrester, VD ₁ , VD ₂ : Voltage detector.

Claims (1)

[Claims] 1. In a two-line power receiving, one-line disconnection system unit in which each component of the unit is housed in a box-shaped main container and filled with insulating gas at low pressure, the two-line power receiving unit is installed at the center of the container, approximately in the longitudinal direction. Three-phase distribution is installed on the center line, two-line power receiving component equipment is distributed on both sides of one line, and each power receiving line component equipment is installed for three phases in a direction perpendicular to the shield disconnector. A lead-in line portion is provided on the outside, and the operating box of each of the component devices is arranged centrally in the space between the bottom plate of the main container and the base, and the operating mechanism of each component is airtightly passed through the bottom plate. Lead out the connection bushing to the transformer via the connecting conductor from the lower terminal of each phase of the inner disconnector of the component equipment, and connect the upper terminal of each phase of the inner disconnector to the communication bus bar. Low pressure gas insulated switchgear.