JPH0159801B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas insulated switchgear (hereinafter referred to as GIS), and an object thereof is to provide a device with an excellent appearance by simplifying the appearance of the main body container.

Recently, the main circuit components of electrical stations have been insulated with gas to reduce their size. However, in the conventional system, each component device is housed in a metal grounding container and connected sequentially. For this reason, the overall appearance is rugged and mechanical, and when installed in urban areas, it tends to create an unnecessarily intimidating feeling in the environment.

Furthermore, since the operating device is attached to each container and is dispersed, inspection and operability are poor, and there are also difficulties in terms of airtightness control.

In view of the above, the present invention effectively utilizes the space between the bottom plate and the base by supporting the bottom plate of the main container at a predetermined height with respect to the base and airtightly drawing out the operation mechanism of the storage device from the bottom plate.See the drawings below. An embodiment of the present invention will now be described.

FIG. 1 is a partially cutaway simplified plan view of an embodiment of the present invention, FIG. 2 is a simplified cross-sectional front view thereof, and FIG. 3 is a partially cutaway 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 main container 1 has a rectangular bottom plate 1a and a bottom plate 1a.
The disconnection chamber 4 is formed into a box shape having side plates 1b to 1e arranged along the four circumferences of the chamber, and a ceiling plate 1f, and partition plates 1g and 1h are provided as necessary.
It is divided into disconnector chambers 5 ₁ 5 ₂ , and each chamber is filled with an insulating gas 6 such as SF ₆ gas or a mixed gas at a 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 shown in FIG. Figure 4 shows an example of two-line power reception, where CHd ₁ and CHd ₂ are cable heads, CT ₁ and CT ₂ are current transformers, DS ₁ and DS ₂ are disconnectors, FSW ₁ and ESW ₂ are grounding devices, and LA ₁ and LA ₂
is a lightning arrester, 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, CB bridges and disconnectors,
ESW ₃ and ESW ₄ are grounding devices for the power supply side and the load side of the breakers, B is a transformer connection bushing, and T is a three-phase transformer placed on the side of the main container 1.

As shown in Fig. 2, three phase disconnectors CB are installed in the center disconnector chamber 4, in a straight line along the longitudinal direction of the main container, and in the disconnector chambers 5 ₁ , 5 ₂ on both sides. Cable heads and other equipment for the first line and the second line for three phases are arranged along a straight line in a direction perpendicular to the longitudinal direction of the main container 1, respectively.

As shown in FIG. 5, which is a partially enlarged detailed view of FIG. 2, the shingle breaker CB is installed by airtightly penetrating the bottom plate 1a, and its operating mechanism part CB ₀ is made to protrude from the bottom. . In addition, the mechanism section CB ₀
The operating shaft is airtightly pulled out from the shaft and is connected to a mechanism in the cutter operating box 7, and the operating box 7 is connected to the opening in the space 8 between the bottom plate 1a and the base 2, as shown in FIG. It is arranged at a position closer to the front than the operating mechanism section CB ₀ . Therefore, the disconnector CB is space 8
It can be pulled out and inspected in this space or elsewhere.

The seal breaker CB is a closed type such as a gas cutter or a vacuum cutter, and is configured so that the interior of the container 1 can be inspected without breaking its airtightness.

The partition plates 1g and 1h are provided with through holes 9 and 10 of the same diameter as shown in FIG.
A bus bar 11 connected to one end of the CB is led out to the chambers 5 ₁ and 5 ₂ . The through hole 9 is sealed by an insulating spacer 12, and the bus bar 11 passes through the center of the through hole 9 in an airtight manner.

The disconnectors DS ₁ and DS ₂ are attached to the partition plates 1g and 1h in the chambers 5 ₁ and 5 ₂ as required, respectively, and one end thereof is connected to the bus bar 11, respectively. (Since the equipment for the first and second lines is installed in the same way, that is, symmetrically, in each room 5 ₁ and 5 ₂ , only the equipment for the first line will be explained below, except for special cases.) Disconnector DS As shown in FIG. 5, _one operating rod 13 has one end housed in a cylindrical operating mechanism section 14 protruding into the lower space 8 of the bottom plate 1a, and is connected to an operating shaft 14a passing through the cylindrical operating mechanism section 14. This operating shaft 14a
is connected to a mechanism (not shown) in a disconnector operating box 15 disposed adjacent to the operating box 7 in the lower space 8 .

The other end of the disconnector DS ₁ is connected to the live conductor of the cable head CHd ₁ . This cable head
CHd ₁ is attached to pass through the bottom plate 1a in an airtight manner, and is connected to the cable 16 in the lower space 8. Each cable 16 passes through a current transformer CT ₁ attached to the frame 3 and is introduced into a cable pit 17 .

An earthing device ESW ₁ is installed in the lower part of the chamber 5 ₁ .
Although not shown, the operating shaft is led out into the space 8 as in the case of the disconnector DS ₁ , and is connected to a mechanism in the earthing device operating box 18 disposed adjacent to the disconnecting switch operating box 7, and is operated. It is configured as follows. This grounding device ESW ₁ is provided with fixed and movable contacts 19 and 20 so as to ground the other end of the disconnector DS ₁ , that is, the cable head side, and the movable contact 20 is connected to a ground wire.

As shown in FIG. 5, in the room ₅₁ , a lightning arrester _LA1 is installed on the axis Q of the cable head _CHd1 so as to pass through the ceiling plate 1f in an airtight manner. The lightning arrester LA ₁ and the cable head CHd ₁ may be configured to be automatically connected by the plug type contactor 21.

The other end of the lightning arrester LA ₁ is connected to an insulated grounding wire 22 .

In addition, a capacitor voltage divider type voltage detector VD ₁ is installed on the side plate _1d opposite to the conductor of the live part of the cable head CHd 1.
, which are each connected to a voltage detector by a secondary lead 24. This detector is also grounded at one end.

As shown in FIG. 2, the side plate 1b of the main container 1,
1d and 1f are provided with hand holes 26, 27, and 28 for inspecting and connecting the stored equipment.
It is always sealed with blind lids 29, 30, and 31.

In addition, in the breaker room 4, the earthing device ESW ₃
and ESW ₄ are attached to an intermediate plate 1i supported by a side plate 1e, as shown in FIG. 3, and are configured to ground the power supply side and load side ground terminals of the shingle breaker CB. These earthing devices ESW ₃ and ESW ₄ have an operating shaft led out into the space 8 and a grounding device operating box 32 arranged adjacent to the disconnecting device operating box 7, as in the case of the disconnector DS ₁ , although it is not shown in the figure. , 33, respectively, and are configured to be operated.

The other end of the bus bar 11 is connected to the through hole 1 of the partition plate 1h.
0 to one end of the disconnector DS ₂ .
This through hole 10 can be sealed with an insulating spacer 12 if necessary, and it is possible to separate the gas from the chamber 5 ₂ and the chamber 5 ₁ from the capacitor chamber 4 .

The disconnector DS ₂ is operated by a mechanism in the disconnector operator box 34, and the earthing device ESW ₂ is operated by a mechanism in the earthing device operator box 35.
It is configured to be operated by the internal mechanism.

A three-phase transformer T is installed opposite the side plate 1c of the main container 1.
A transformer connection bushing B, which hermetically passes through the side wall 1c of the shroud breaker chamber 4, connects the transformer T and the load side of the sheath breaker CB. Note that 36 is a connection conductor that connects the bushing B and the sheath breaker CB.

When the instrument transformer is housed inside the GIS, its secondary terminal is led out from the bottom plate 1a to the lower space 8. In addition, when installing an instrument transformer or a commercial transformer/current transformer (MOF) outside the main container 1, the bottom plate 1
It is arranged in the lower space 8 of a.

Each device disposed in the lower space 8 is partially or entirely covered using a decorative board 37 as necessary so that the unevenness is not visible.

Incidentally, the base 2 may be lowered by excavating the ground so that only the main container 1 appears on the ground surface, and by doing this, 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 hermetically passes through the bottom plate 1a so that the cable is guided into the lower space 8.

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

As described in detail above, according to the present invention, a box-shaped main body container is used, a space is formed between the bottom plate and the base, and the operating mechanism portion of the storage device that requires operation is led out from the bottom plate and is inserted into the space. By arranging the control box, the external structure of the GIS is simplified, and a device with excellent aesthetic appearance can be provided, which can be harmonized with the environment. Furthermore, since the operating mechanism and the operating box are concentrated in one place instead of being dispersed in each container as in the conventional case, inspection operations are easy, and the operating mechanism can be led out from the entire bottom plate, allowing for airtight management. is easy. Since the lower part of the bottom plate is located at a high position, it is easy to process the cable ends, and the depth of the cable pit can also be made shallow.

In addition, when installing an airtight drawer, operating device, etc. in a box located in the space below the bottom plate, as in the example,
Inspection work is easy, direct exposure to the atmosphere can be prevented (the box can be easily sealed with packing, etc.), and the resistance of rotating airtight parts such as the operating shaft is increased. , there is no need to worry about rusting, and reliability is increased. Moreover, when using a pedestal, the current transformer can be installed using it.
The frame and each control box can be designed as one unit, which has advantages such as being economical.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and Fig. 1 is a partially cutaway simplified plan view, Fig. 2 is a simplified sectional front view thereof, and Fig. 3 is a simplified partially cutaway plan view.
The figure is a partially cutaway simplified side view, FIG. 4 is a single line connection diagram of what is shown in FIGS. 2 and 3, and FIG. 5 is a partially enlarged detailed view of FIG. 1: Main container, 1a: Bottom plate, 2: Base, 3:
Frame, 6: Insulating gas, 8: Space, 7, 15, 1
8, 32, 33, 34, 35: Controller box, CB:
Cable disconnector, CHd ₁ , CHd ₂ : Cable head.

Claims (1)

[Claims] 1. A box-shaped main container filled with insulating gas, component devices such as insulation switches, disconnectors, grounding devices, etc. stored in this main container, and installed on a base to raise the main container to a predetermined height. a pedestal supported by a pedestal, a space formed within the pedestal between the bottom plate and the base of the main container, an operating mechanism of the component equipment all airtightly led out from the bottom plate to the space, and all arranged in the space. A gas insulated switchgear comprising: an operator box for the component equipment;