JPS62141910A - Gas insulated switchgear - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a gas insulated switchgear installed in an electrical station such as a substation.

[Prior Art 1] Generally, a gas insulated switchgear is provided with a line unit that includes at least a cable head for leading in a cable, a line-side disconnector, a circuit breaker, and a bus conductor that constitutes a bus bar.

Figure 5 shows a high-pressure type line unit 1 which sets the pressure of 5F (3 gases) high in a container, among the line units of conventionally used gas insulated switchgear.
In the same figure, 01 in J3 is a circuit breaker 1~ which houses a circuit breaker CB and surrounding equipment in a cylindrical breaker element container 2 supported on a pedestal 1. .

In this example, the circuit breaker element container 2 includes circuit breakers CB and 6, earthing switches ES11 and ES12, and current transformer CT.
is stored.

e2 and e3 are the first and second busbars 8 L in the cross tube-shaped first and second busbar element containers 3 and 4, respectively.
First and second busbar elements that house busbar conductors 5 and 6 that constitute JS 1 and BUS2, and in this example, the busbar conductors and the busbar conductors are housed in the first and second busbar element containers 3 and 4. Disconnector DS11 and [) 312
are stored in each. The first and second bus bar element containers 3 and 4 are arranged vertically side by side on the front side of the circuit breaker element container 2, and are provided with insulating spacers 7 and 8, respectively.
It is connected to each two of the interrupter element containers through the tIi.

e4 is a cable head CHd, a line-side disconnector DS2, and a lightning arrester L in a cylindrical container 11 supported on a pedestal 10.
This is a cable head element configured by housing A and an earthing switch 3ES2.

The container 11 is arranged behind the circuit breaker element container 2 on the back side, and the upper portions of the containers 2 and 11 are connected to each other via an insulating spacer 12.

The cylindrical containers 2, 3.4, and 11 are all configured to meet the standards for high-pressure containers, and SF6 gas is kept at a high pressure of 4 to 5 [KT]f/cffl'1 in these containers. is filled with.

Figure 6 shows another example of a conventional line unit, a low-pressure line unit in which the gas pressure inside the container is set low. ) The first and second busbar conductors 5 and σ6, the busbar side disconnector [ ] 311 and D S 1 are arranged on the front side of the circuit breaker element el' which is housed in the circuit breaker element container 15.
The first and second bus bar elements C2' and e3', which are constructed by storing the bus bar elements C2 and C2 in box-shaped first and second bus bar element containers 16 and 17, are arranged in two stacked layers.

The containers 16 and 17 of the busbar elements e2' and e3° are connected through an insulating spacer 18, and the busbar elements e2' and c3' are connected through the insulating spacer 18. Further, the containers 16 and 15 are connected through one insulating spacer, and the bus bar element e2' and the line element e1' are connected through this insulating spacer 19.

The oblong box shape z20 of the cable head element e4' is arranged on the volume V9116 of the bus bar element e2',
This box-shaped container 20 houses a cable head CHd, a line-side disconnector DS2, an earthing switch ES2, and a current transformer CT. The container 20 and the circuit breaker element container 15 are connected by an insulating spacer 21, and the cable head element e4' and the circuit breaker element el' are connected via the insulation spacer 21.

Containers 15, 16, 17 and 20 each contain SF6 gas containing 2K (I f /
It is filled with a pressure of less than a centimeter.

[Problems to be solved by the invention] In the line unit shown in FIG.
When performing inspection and repair in step 1, it is necessary to remove the busbar element or cable head element or lift the circuit breaker element container 2 upwards, which requires a lot of effort and effort! ). In particular, when lifting the circuit breaker elements 1 to 2, a large space is required above the circuit breaker elements.
There was a problem in that the construction cost of the building would be high.

Generally speaking, in each of the above-mentioned gas-insulated RlA devices, the cable was connected to the cable head from below the cable head container, which inevitably made the cable connection work complicated. Also, it is necessary to provide space below the cable head container to handle the connector at the end of the cable and insert it into the cable head!
Therefore, it was necessary to increase the depth of the underground cable pit, which caused the problem of increasing the construction cost of the electric station.

In addition, in the line unit shown in Fig. 6, bus bar Niremen 1
When an accident occurred at ~e2' and e3', it was difficult to remove these elements, so there was a problem that restoration work could not be carried out quickly.

The purpose of the present invention is to be able to easily carry out inspection μ burial measures for each elm 1, to easily connect and disconnect cables, and to adjust the depth of the cable pit so that tl < L/ I? The object of the present invention is to provide a gas insulated switchgear that reduces construction costs.

Means for Solving Problem L] As shown in FIG. 1 showing an embodiment of the present invention, at least the circuit breaker CB, the line-side disconnector DS2, the cable head C)ld, and the busbar conductor constituting the busbar. The present invention is directed to a gas insulated switchgear equipped with 40.

In the present invention, the circuit breaker CB, the line-side disconnector DS2, and the cable head CHd are connected to a common line element container 3.
0, and the bus conductor 40 is housed in the line element container 30.
The busbar element containers 37A and 37B are connected to the busbar element container connection openings 31.32 provided on the side surfaces of the busbar element containers 37A and 37B via insulating slides 38.39.

A cable attachment/detachment opening 34 is provided on the side surface of the line element container 30 at a position below the busbar element container connection opening 32, and the cable head CHd is attached so as to airtightly close this cable attachment/detachment opening.

A connector 48 provided at the end of the cable is detachably connected to the cable head CHd through the cable attachment/detachment opening 34.

[Operation of the invention 1] With the above configuration, even if an accident occurs in any element, the element in which the accident occurred can be removed for inspection and repair without affecting other elements or lifting any element. It can be performed. Therefore, inspection and repair work on the element can be easily performed. Since there is no need to lift the element, the height of the ceiling of the building housing the gas-insulated switchgear can be lowered.

In addition, since the cable head and cable can be connected from the side of the track element container using the space below the bus bar element, the insertion dimensions for connecting the cable end to the cable head can be adjusted up and down. There's no need to take it. Therefore, the depth of the cable pit 1- can be made shallow, which is economical.

[Example 1 The present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the present invention, and the electrical configuration of each phase of the embodiment is as shown in the single line diagram of FIG. 4. In FIG. 1, reference numeral 30 denotes a line element container configured in a vertically elongated box shape, and busbar element container connection openings 31 and 32 are vertically spaced apart from each other in the upper part of the side surface on the back side of the line element container 30. is provided. A portion of the rear side surface of the line element container 30 located below the wire element container connection opening 32 is formed into a dogleg shape in cross section to form a cable head mounting portion 33. The cable attachment/detachment opening 34 is inserted through the downwardly facing inclined wall 33a of the cable attachment/detachment part 33.
is provided.

The line element container 30 is supported on an installation base 35, and an operating device box 36 is arranged on the front side of this container 30, and the operating device box 36 and the container 30 are connected by appropriate means.

37Δ and 37B are containers for the first and second genera element elements 1, respectively, and these generatrix element containers are cylindrical containers having a cross tube shape in which the first cylindrical portion 371 and the second cylindrical portion 372 are orthogonal to each other. , the first cylindrical portions 371 of the busbar element 1 to the containers 37A and 37B are hermetically connected to the FFI line element container connection openings 31 and 32 via insulating bases 38 and 3, respectively.

Inside the track Nilemen 1 to vessel 30 are a circuit breaker CB, a disconnector DS2, a grounding switch FS2, a lightning arrester 1-△, and a current transformer CT.
and a cable head 0d for three phases are housed, and the cable head CI-1d is attached so as to airtightly close the care pull attachment/detachment part 34. The internal circuit breaker CB of these devices consists of a circuit breaker housing an arc extinguishing mechanism in an independent circuit breaker container, and other devices are arranged in the gas space within the container 30.

The second cylindrical portion 372 of each of the generatrix element volumes 1W 37A and 37B is oriented in the lateral direction (direction perpendicular to the paper plane of FIG. and second bus lines BUS1 and B
A conductor 40 constituting US2 is housed. First and second bus-side disconnectors DS11 and 312 are arranged near the intersections of the first cylindrical part 371 and the second cylindrical part 372 in the bus-bar element containers 378 and 37B, respectively, and US 1 is connected to one end of the circuit breaker CB via the disconnector DS11, a 1-wire conductor 41 placed in the container 37Δ, a through conductor of the insulating spacer 38, and a connecting conductor 42 placed in the container 30. There is. In addition, the bus line BUS2 is connected to a disconnector DS12 and a connecting conductor 4 disposed in the container 37B.
3 and the insulating spacer are connected to the connecting conductor 42 via the three through conductors and the connecting conductor 44 arranged in the container 30,
A current transformer CT is attached to the conductor 42.

The other end of the circuit breaker CB is connected to the cable head CPI d via the line side disconnector DS2 and the connecting conductor 45,
A ground switch 29ES2 and a lightning arrester LA are provided between the conductor 45 and the ground connecting the disconnector DS2 and the cable head.

The operating devices and control panels of the circuit breaker CB, the disconnector DS2, and the ground 1;
Operating devices 46 and 47 for operating the D S 1 and D S 12 are attached.

Cable head CHd is a slip-on type, and this cable head CI-1d is installed at the end of cable C launched from an underground cable pit]
A connector 48 is connected so that it can be inserted diagonally from below.

The containers 30, 37A and 37B all have an airtight structure, and the inside of the line element container 330 and the bus bar element container 37A
and 37B are filled with SF6 gas. In this case, the box-shaped track elm]・S in the container 30
The rated pressure of F6 gas (referring to the pressure at 20°C; the same applies hereinafter) is set to a level as low as 2hf/crA. Another cruciform 1′! The one-wire element containers 37A and 37B are configured to meet the standards for high-pressure containers,
The rated pressure of the SF6 gas in these GTIGI Niremen 1 to 2 containers is set to a high pressure of 2 g f /cri or higher. When using a gas circuit breaker as circuit breaker CB,
SF6 gas is filled at a predetermined pressure, for example, at a high pressure of 2 KOf/cm or more, into the shut-off container which houses the shut-off section, and the inside of the shut-off container and the container 30 for the line 1 are separated from each other by separate gas spaces. It consists of

The line element container 30 and the i device housed in this container constitute a line element E1, and the bus element containers 37Δ and 37A and the devices respectively housed in these containers constitute the first and second Busbar elements E2 and E3 are configured. and the line element E1 and the first and second busbar elements E2 and 133.
As a result, a line unit u[ with a 2i[1 busbar configuration] is configured.

When several track units U are arranged side by side to form a row board, the track element containers 30 of adjacent track units are arranged closely together as shown in FIG. . The busbar elements of the adjacent line units are interconnected via the bellows tube 48 and the insulating space +J-49, and thereby the busbars BUS1 and BUS2 of the adjacent line units UL are interconnected.

If necessary, the line unit 1 can be disconnected by removing the bellows tube 48.

In the above gas insulated switchgear, the line element E1
If an accident occurs, repair and inspection work is carried out by separating the track element E1 where the accident occurred from the busbar elements [2 and E3 and pulling it out along with the operating box to the opposite side of the busbar element.

In addition, when a ¥IN sheet occurs on the m-line Element 1~, inspection can be carried out by shutting off the power to the busbar where the accident occurred and removing the Busline Element 1~ container from the track element container. As described above, according to the present invention, when an accident occurs in each element, it is possible to perform inspection and repair without affecting the other elements, and it is possible to easily perform inspection and repair work on the elements. Furthermore, since there is no need to lift the element, there is no need to prepare a large space above the line element, and the height of the ceiling of the building housing the gas insulated switchgear can be lowered.

Further, the cable head and the cable can be connected from the side of the container by utilizing the space below the busbar element. Therefore, it is not necessary to take the insertion dimensions up and down for connecting the end portion of the cable to the cable head, and the depth of the cable pit can be made shallow.

Furthermore, as mentioned above, bus bar element containers 37A, 37
B is made to have a structure capable of withstanding high pressure, and its interior is filled with SF6 gas at a high pressure of 2 gf/ci or more, and the line element container 30 is configured in a box shape, and SF6 gas is filled inside it at 2K (2K).
Filling at low pressures below If/Cl11 allows economical design of the container and downsizing of equipment.

If the rated gas pressure is now 1Kgf/cffl, the strength of the standard container is 4KCJf/ci if the safety factor is 4.
That's fine. On the other hand, the rated gas pressure is 4K (if/cfl,
If the safety factor is 4, the strength of the container is 16Kgf/cff.
It becomes l. From these facts, it seems that setting the gas pressure inside the container to a lower level can lower the strength of the container and make the container more economical.
If the gas pressure is set low, it is necessary to provide a long insulation distance within the container, which increases the size of the container, so it is not necessarily economical, and it is possible to avoid increasing the size of the device. ] I can't.

Furthermore, in cases where the volume of the container is small, such as in the case of a bus-bar air element intervenor, there is no advantage in lowering the gas pressure for the following reason. That is, when an internal arc accident occurs, the internal pressure of the container is increased by the arc energy, but this pressure limit is determined only by the arc current and time, regardless of the initial pressure. In the case of a container with a small volume such as a busbar element container, if the fault current is set to 25^ and the duration of each event is approximately 0.5 to 1 second, the pressure inside the container will be 15 to 20K (lf/c).
The strength of the container will be determined by this value. In this way, containers with small volumes require high strength regardless of the rated gas pressure, so it is more economical to set the rated gas pressure high and reduce the container dimensions. It is. Therefore, it is preferable to use a high-pressure-resistant container in which each part has a circular cross-sectional shape as the busbar element container, and to set the rated gas pressure to a high pressure of 2 Kgf/cd or more. If such a bus bar element container is used, it is possible to reduce the dimensions of the bus bar element container, and a large space can be taken between the bus bar elements of adjacent units 1 to 1. Connection and disconnection work between busbar elements can be facilitated.

In the case of a large container such as a track element container, its volume is sufficiently large, so the pressure upper limit in Accident I, 1 is not large, and the strength of the container is determined approximately at the rated gas pressure. Therefore, in the case of a container with a large volume, it is better to set its rated pressure as low as possible. In addition, in the track element, the breaking part of the circuit breaker CB is housed in a special container, and the rating of the gas in the container is There is no problem in setting the pressure lower than the pressure applicable to the regulations for Class 2 pressure vessels.When setting the rated pressure inside the vessel to be low in this way, it is necessary to make the cross section of the vessel circular. 1. If the container is box-shaped, the space inside the container is higher than that of a circular container, so the space inside the container can be used effectively. By utilizing this to increase the degree of freedom of the BIZ layerer 1~ within the container, the design of the device can be facilitated. Therefore, Railway Niremen 1~Yonsan;
It is preferable that the container be constructed in a box shape and filled with a low-pressure gas of less than 2 Kgf/cm that does not meet the application of high-pressure container standards. When a box-shaped container is used in this way, a plurality of line units 1 to 1 are arranged side by side. If the sea urchins are placed side by side, the appearance can be simplified.
You can easily achieve harmony between boundaries.

In the above embodiment, a cable head attachment part 33 having a dogleg-shaped cross section is provided at the lower part of the side surface of the container 30, and the connector at the end of the cable is connected to the cable head from diagonally below. As shown in FIG. 3, the cable head CHd is installed so as to airtightly close the cable attachment/detachment opening 34 provided on the side surface of the line element container 30 and positioned below the busbar element container connection opening 32. The connector 48 of the cable end portion may be connected to the cable head in a horizontally removable manner.

[Effects of the Invention] As described above, according to the present invention, space is maintained in front of the track element and behind the bus bar element, so that even if an accident occurs in any element, other elements It is possible to remove the element in which the accident occurred and repair the element without affecting the element and without lifting the element.Furthermore, since there is no need to lift the element, The height of the ceiling of the building housing the gas-insulated switchgear can be lowered.

In particular, according to the present invention, since the space below the bus bar element is used to connect the cable head and the couple from the side surface of the line element container, it is possible to connect the cable end to the cable head. There is no need to set the insertion dimensions up and down, and there is an advantage that the depth of the cable pit can be made shallow.

[Brief Description of the Drawings] Fig. 1 is a sectional view schematically showing the configuration of a line unit according to an embodiment of the present invention, with each device abbreviated using circuit symbols, and Fig. 2 is a cross-sectional view schematically showing the configuration of a line unit according to an embodiment of the present invention. FIG. 3 is a plan view showing a state in which track units are arranged side by side to form a row board; FIG. 3 is a sectional view schematically showing the configuration of another embodiment of the present invention; FIG.
The figure is a single line diagram showing the electrical configuration of each phase in the embodiments of Figures 1 and 3, and Figures 5 and 6 respectively show different configuration examples of line units of conventional gas-insulated switchgear. FIG. 7, which is a schematic diagram of the configuration, is a plan view showing a state in which the line units 1 of FIG. 6 are arranged side by side to form a row board. 30... Track element container, 31.32... Bus bar element container connection opening, 34... Cable attachment/detachment opening, 37A, 37B... Bus bar element container,
CB...Breaker, 1) 811. DS12...Busbar side disconnector, DS2...Line side disconnector, CHd...Cable head, ES2...Earthing switch, LA...Lightning arrester. @5 Figure 6

Claims (1)

[Scope of Claims] In a gas-insulated switchgear including at least a circuit breaker, a line-side disconnector, a cable head, and a bus conductor constituting a bus bar, the circuit breaker, line-side disconnector, and cable head share a common line. The busbar conductor is housed in an element container, and the busbar conductor is housed in the busbar element container connected via an insulating spacer to a busbar element container connection opening provided on a side surface of the line element container, and the busbar element container connection A cable attachment/detachment opening is provided on the side surface of the line element container, and the cable head is installed so as to airtightly close the cable attachment/detachment opening, and the cable head is attached to the end portion of the cable. A gas insulated switchgear characterized in that a provided connector is detachably connected to the cable head through the cable attachment/detachment opening.