JP2000299905A - Gas insulated lightning arrester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To install a gas insulated lightning arrester in a smaller area without using branch conductors, by arranging at the central part of an enclosed container a connecting electrode gas-insulated from a bus part by insulating spacers having a central electrode between stacked zinc oxide elements and an insulated supporting insulator. SOLUTION: Connecting conductors 46g in which a load current flows are gas-insulated by insulating spacers 46f at bus connecting parts 46e and contained inside a gas insulated lightning arrester 46. Generated heat in this part raises the interior temperature of the arrester 46, but the length of the connecting conductors 46g at the portion of the arrester 46 is so short that the amount of heat generation is minimal. The enclosed container 46a of the arrester 46 has sufficient radiating area for the amount of heat generation at the portion of the connecting conductors 46g so that the temperature of a breaker side arrester 46 rarely rises. Thus, the structure of series connection to a connecting bus 45 can be achieved by incorporating a part of the connecting bus 45. As a result, branch buses which connect the arrester to the connecting bus are not required, and installation space is virtually not required, either.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated lightning arrester used for a gas insulated switchgear installed in a power plant or a substation.

[0002]

2. Description of the Related Art 1000 kV class U exceeding 500 kV
Abnormal voltage levels such as lightning surges and switching surges in the HV transmission system are high, and the equipment used is of an insulation level that can withstand the generated abnormal voltage, and has very large dimensions. Suppressing the abnormal voltage level leads to downsizing of equipment and improvement of insulation reliability. In devices of the UHV power transmission system, a plurality of lightning arresters are arranged at short intervals in order to suppress an abnormal voltage level, and miniaturization of the devices and improvement of reliability are achieved.

An example of a conventional UHV gas insulated switchgear is disclosed in, for example, FIGS. 14 and 15 disclosed in Japanese Patent Application Laid-Open No. 7-39028. FIG. 14 is a plan view of the gas insulated switchgear, and FIG. 15 is a side view of the bus connection unit of FIG. In the figure, reference numeral 1 denotes a main bus constituting three phases by phase-separated buses 1a, 1b and 1c, 2 denotes a main bus constituting three phases by phase-separated buses 2a, 2b and 2c, and 3 and 4 denote main buses. Line units connected to buses 1 and 2, 5, 6, and 7 are transformer units connected from main buses 1 and 2 to a transformer, and 8 is a bus connection for connecting and disconnecting between main buses 1 and 2 Unit.

The line units 3 and 4 and the transformer units 5, 6 and 7 have substantially the same configuration, and 11 of each unit is a circuit breaker, 12 is a current transformer arranged at both ends of the circuit breaker 11, Reference numeral 13 denotes a disconnector for connecting and disconnecting between the circuit breaker 11 and the main bus 1, and reference numeral 14 denotes a disconnector for connecting and disconnecting between the circuit breaker 11 and the main bus 2. 15 is a connection bus between the disconnector 13 of the bus connection unit 8 and the circuit breaker 11, 16 is a connection bus between the disconnector 14 of the bus connection unit 8 and the circuit breaker 11,
It is composed of a vertical portion 16a and a horizontal portion 16b on the circuit breaker 11 side, and a vertical portion 16c on the disconnector 14 side. Reference numeral 17 denotes a branch bus that branches from the connection conductor 16 and connects to the lightning arrester;
Reference numeral 8 denotes a gas insulated arrester connected to each of the main bus 1 and the main bus 2.

In this configuration, the line units 3, 4 and the transformer units 5, 6, 7 include a circuit breaker 11, and current transformers 12 arranged on both sides of the circuit breaker 11 through a main bus 1 via a disconnector 13. The bus connection unit 8 is connected to the main bus 2 via a disconnector 14, and the main bus 1 and the disconnector 13, the circuit breaker 11, the current transformer 12, and the disconnector 14 are connected in series with the main bus 1, To the branch bus 17a from the main bus 2 side.
, Gas-insulated surge arrester 18, branch bus 1 from main bus 1 side
The gas-insulated lightning arresters 19 are respectively connected by 7b.

The configuration of the gas insulated surge arresters 18 and 19 used in the configuration of FIG. 14 is as shown in FIG. In the figure, 18a is a surge arrester container, 18b is a stacked zinc oxide element, 18c is a stacked zinc oxide element 1
8a is a connection electrode arranged on one end side of FIG. 18d is a supporting insulator for supporting the zinc oxide element 18b via the connecting electrode 18c, 18f is an insulating spacer for supporting the branch bus and the connecting conductor, and separating the gas from the bus of the gas insulated switchgear.
g is a connection conductor connecting between the branch bus bar 16d and the connection electrode 18c, and 18h is a gantry. The inside of the surge arrester container 18a is filled with an insulating gas.

[0007] The lightning arrester having the configuration of FIG.
15, the gas-insulated surge arresters 18 are provided on both sides of the circuit breaker 11 of the bus connection unit 8 as shown in FIG.
And 19 are arranged.
Is connected from the connection bus 16 by a branch bus 17a, and the gas-insulated lightning arrester 19 is connected by a branch bus 17b, and is connected to a space where the gas-insulated lightning arresters 18 and 19 are arranged and from the connection bus 16 for connection. In addition, the branch buses 17a and 17b are required, and the size becomes large as a gas insulated switchgear.

Further, as a configuration for connecting to an overhead power transmission line of a UHV-class gas insulated switchgear, see, for example,
FIG. 17 and FIG. 18 disclosed in Japanese Patent Publication No. 112419. FIG. 17 is a plan view, and FIG. 18 is a side view. In the figure, 21 is a circuit breaker, 22 is a current transformer arranged in series with the circuit breaker 21, 23 and 24 are bus-side disconnectors, 2
5 is a line-side disconnector, 26 is a bushing connection bus, 27 is a gas-insulated lightning arrester arranged on the circuit breaker 21 side of the bushing connection bus 26, 28 is a gas-insulated lightning arrester arranged on the bushing side, and 29 is an overhead transmission line. This is the bushing of the connecting part.

In this configuration, the gas-insulated lightning arrester 27 is arranged on the circuit breaker 21 side, and the lightning arrester 28 is arranged on the bushing 29 side.
And 28 are connected to the respective gas insulated lightning arresters 27 and 28 from the connection bus 26 by a branch bus.

[0010]

As described above, in the conventional UHV-class gas insulated switchgear, the gas insulated arrester is installed not only at the portion connected to the overhead line but also at the main bus portion. The size of the gas insulated lightning arrester is large because it is for high voltage, and a large space is required to arrange it, and the installation area as a gas insulated switchgear becomes large. Lightning arrester 2
Since the branch buses 17a and 17b connecting to the gates 7 and 28 are required, there is a problem that the cost becomes high as the gas insulated switchgear.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has a structure in which a gas-insulated lightning arrester can be installed in a gas-insulated switchgear without using a branch conductor. It is another object of the present invention to provide a gas-insulated lightning arrester having a low installation cost as a gas-insulated switchgear.

[0012]

According to a first aspect of the present invention, there is provided a gas-insulated lightning arrester comprising a plurality of stacked zinc oxide elements, an insulating support insulator for supporting the zinc oxide elements, and a plurality of stacked zinc oxide elements. A gas insulated switchgear having a connection electrode disposed between an element and an insulating support insulator disposed in the center of a sealed container, and insulating spacers having center electrodes disposed on both sides of the sealed container facing the connection electrode. A bus connecting portion is provided by dividing the bus portion with a gas, and a connection conductor is connected between the connection electrode and the center electrode of the insulating spacer of the bus connecting portion.

According to a second aspect of the present invention, there is provided a gas-insulated surge arrester, wherein the plurality of zinc oxide elements according to the first aspect are stacked vertically and arranged above and below the busbar connection portion of the sealed container. In this configuration, an insulating support insulator is arranged in the first direction, and connection conductors for connecting between the connection electrode and the busbar connection portion are arranged in a horizontal direction.

According to a third aspect of the present invention, there is provided a gas insulated lightning arrester having a structure in which the bus connecting portion of the sealed container and the portion for accommodating the zinc oxide element are separable.

According to a fourth aspect of the present invention, there is provided a gas insulated lightning arrestor, wherein the plurality of zinc oxide elements having the structure of the first aspect are vertically stacked and disposed below and inside the bus connecting portion of the sealed container. In this configuration, an insulating support insulator is arranged in the first direction, and connection conductors for connecting between the connection electrode and the busbar connection portion are arranged in a horizontal direction.

According to a fifth aspect of the present invention, there is provided a gas-insulated lightning arrester, wherein the bus connecting portions disposed on both sides of the closed container according to the first to fourth aspects have an angle corresponding to the direction of the connected bus. It is arranged at the position of.

According to a sixth aspect of the present invention, there is provided a gas-insulated lightning arrester having a structure in which the bellows is provided between one of the bus-bar connecting portions of the sealed container according to any one of the first to fifth aspects. It is.

A gas-insulated surge arrester according to a seventh aspect of the present invention is the gas-insulated surge arrester according to the first aspect, wherein the plurality of zinc oxide elements are stacked in a horizontal direction, and one end is disposed at one end side from the bus connecting portion of the sealed container. Then, an insulating support insulator is arranged on the other end side, and the connection conductor connecting between the connection electrode and the busbar connection portion is arranged vertically.

According to an eighth aspect of the present invention, there is provided a gas insulated surge arrester according to any one of the first to seventh aspects, wherein a connection conductor having the same cross section as the bus is provided between the connection electrode and the bus connection on both sides of the sealed container. Through the connection electrodes to connect the center electrodes of the insulating spacers.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 shows an example of a single-line diagram of a switchgear of a UHV-class substation. FIG. 2 is a configuration diagram in the case where the line unit and the transformer unit of the single line diagram of FIG. 1 are configured as a gas insulated switchgear. In the figure,
31A is a section A of the first main bus, 31B is a section B of the first main bus, 32A is a section A of the second main bus, and 32B is a section B of the second main bus. 33 is the first main bus 31A
A bus arrester installed at the portion of the second main bus 32A and the bus arrester installed at the portion of the second main bus 32A, and a bus arrester installed at the portion of the second main bus 32A and 32B. Show.

Reference numeral 37 denotes a transformer, and reference numeral 40 denotes a line unit. A circuit breaker 41, a current transformer 42, a bus-side disconnector 43B, a line-side disconnector 43L, a ground switch 44, a connection bus 45, and a gas on the circuit breaker side. It comprises an insulating arrester 46, a line-side arrester 47, a voltage transformer 48, and a bushing 49. Reference numeral 50 denotes a line unit, which includes a circuit breaker 41, a current transformer 42, a bus-side disconnector 43B, a line-side disconnector 43L, a ground switch 44,
Connection bus 55, circuit breaker side lightning arrester 56, line side lightning arrester 4
7, a voltage transformer 48 and a bushing 49.

The line unit 40 shows a case in which the circuit breaker-side lightning arrester 46 is installed above the connection bus 45, and the line unit 50 has the circuit breaker-side lightning arrester 56 provided with the engraved portion 35 and directed downward from the connection bus 55. It shows the case of installation. The line-side lightning arrester 47 has a conventional configuration in which a connection bus 45 is connected to a branch bus.

Reference numeral 60 denotes a transformer unit,
1, current transformer 62, bus-side disconnector 63B, ground switch 6
4, a connection bus 65, and a transformer-side lightning arrester 66. Reference numeral 70 denotes a bus connection unit, which includes a circuit breaker 71, a current transformer 72, a disconnector 73, a ground switch 74, and a connection bus 75. Reference numeral 80 denotes a bus section unit, which includes a circuit breaker 81, a current transformer 82, a disconnector 83, a ground switch 84, and a voltage transformer 88.

FIG. 3 is a side view of the case where the circuit breaker side lightning arrester 46 of the line unit 40 is installed as a gas insulated lightning arrestor above the connection bus 45. FIG. 4 shows the main bus 31A.
FIG. 6 is a side view of a case in which a bus arrester 33 connected to the main bus is installed above the main bus 31A as a gas insulated arrester.

In the first embodiment, as shown in FIG. 3, the circuit breaker side lightning arrester 46 of the line unit 40 shown in the single line diagram of FIG. 1 is connected above the connection bus 45 as shown in FIG. 3 or to the first main bus 31A. This is intended for a case where the bus arrestor 33 to be used is installed above the main bus 31A as a gas insulated arrester as shown in FIG. FIG. 5 shows a case where the circuit breaker side lightning arrester 46 is configured as a gas insulated lightning arrester. In FIG. 5, 46a is a sealed container, 46b is a stacked zinc oxide element, 46c is a connection electrode of a portion connected to the bus bar,
6d is an insulating support insulator for supporting the zinc oxide element 46b and the connection electrode 46c, 46e is a busbar connection portion which is sealed by arranging a conical insulating spacer 46f having a center electrode on both sides of the sealed container 46a, and 46g is a connection electrode. A connecting conductor 46h having a cross section equivalent to that of the conductor at the bus 45 connecting the bus connecting portion 46c and the bus connecting portion 46e, and 46h is a mount supporting the circuit breaker side lightning arrester 46.

The lightning arrester on the circuit breaker side shown in FIG.
The connection conductor 46g through which a load current flows is accommodated in the gas-insulated lightning arrester 46, which is separated from the gas by the insulating spacer 46f of e.
6, the length of the connection conductor 46g at the portion of the gas-insulated lightning arrester 46 is short, the calorific value is small, and the sealed container 46a of the gas-insulated lightning arrester 46 is provided.
Has a sufficient heat radiation area with respect to the calorific value of the portion of the connection conductor 46g, and the temperature of the circuit breaker side lightning arrester 46 does not rise so much.

The circuit breaker side lightning arrester 46 has a configuration in which a part of the connection bus 45 is taken in and connected in series to the connection bus 45, and a branch bus for connecting the circuit breaker side lightning arrester 46 to the connection bus is required. In addition, since the connection bus 45 is connected in series, no space is required for installation. Bus arrestor 3 provided at main buses 31A and 31B
3 is identical to the circuit breaker side lightning arrester 46 shown in FIG. 5, the spacing between the main buses can be arranged closely without providing a lightning arrestor, so that the installation space can be reduced as a gas insulated switchgear. it can.

FIG. 6 shows the case where the circuit breaker side lightning arrester 46 shown in FIG. 5 is installed at the bent portion of the connection bus 45 of the line unit 40, and the bus connection 46e is bent at the angle α of the connection bus 45.
It is a block diagram in the case of providing in the direction of. When the circuit breaker-side lightning arrester 46 configured as described above is arranged at the bent portion of the bus, the means for bending the connection bus 45 becomes unnecessary, and the connection bus 4
5 can be composed of only a low-cost straight section, and the economical efficiency of the branch bus is improved.

In the UHV substation as shown in the single line diagram of FIG. 1, the line side lightning arrester 47 of the line unit 40 is strictly responsible for surge voltage intruding from the power transmission line side, but the busbar lightning arrester 46 is lightly responsible. As a configuration of the UHV substation, the number of stacked circuit breaker lightning arresters 46 and bus line lightning arresters 33 and 34 is increased by about 5% with respect to the line side lightning arrester 47 to increase the limiting voltage, and under the same conditions. The current flowing through the lightning arrester is made smaller than that of the line-side lightning arrester 47 to reduce the temperature rise and lighten the duty. If the lightning arrester is damaged by the excessive duty when an excessive lightning surge enters, the line-side lightning arrester is easy to separate from the installation part. Coordination is performed so that only 47 is damaged, and care is taken to keep the operation reliability of the gas insulated switchgear of the substation high.

Embodiment 2 FIG. In the second embodiment, the circuit breaker side lightning arrester installed on the connection bus and the bus lightning arrester installed on the main bus side are configured integrally by taking in a part of the bus so that the zinc oxide element is below the bus part. This is a gas-insulated lightning arrester. The circuit breaker side lightning arrester 56 or the main bus 32 of the line unit 50 shown in FIGS.
This shows a case in which the bus arrester 34 connected to A and 32B is configured as a gas insulated arrester, and is provided with a dug portion at the installation location. Track unit 5 in this case
FIG. 7 is a side view of a portion 0, and FIG. 8 is a side view of a portion of the bus arrester 34 installed on the main bus 32A. At the part where the circuit breaker side lightning arrester 56 of the track unit 50 is installed,
5. A dug portion 36 is provided at a portion of the main bus 32A where the bus lightning arrester 34 is installed.

FIG. 9 shows the structure of the circuit breaker-side lightning arrester 56 in which the zinc oxide element of the connection bus 55 in FIGS. 7 and 8 is arranged below the position of the bus. 9, 56a is a sealed container, 56b is a stacked zinc oxide element, 56c is a connection electrode connected to the bus bar, and 56d is a zinc oxide element 5
6b, an insulating support insulator for supporting the connection electrode 56c, 56e
Are connected to each other at a closed bus-bar connection portion by arranging conical insulating spacers 56f having a center electrode on both sides of a sealed container 56a.
Reference numeral 6g denotes a connection conductor having a cross section equivalent to that of the conductor of the bus bar 55 connecting the connection electrode 56c and the bus bar connection portion 56e, and 56h denotes a gantry supporting the circuit breaker lightning arrester 56.

In the circuit breaker-side lightning arrester 56 of FIG. 9 as well, as in the configuration of FIG. 5 of the first embodiment, the gas is divided by the insulating spacer 56f of the bus connecting portion 56e, and the load current flows inside the gas-insulated lightning arrester 56. The flowing connection conductor 56g is accommodated, and the heat generated in this portion increases the internal temperature of the circuit breaker-side lightning arrester 56.
The length of the connection conductor 56g in the portion 6 is short and the amount of heat generation is small, and the sealed container 56a of the circuit breaker side lightning arrester 56 has a sufficient heat radiation area for the heat generation in the portion of the connection conductor 56g. Therefore, the temperature of the circuit breaker side lightning arrester 56 does not rise so much. The bus arrester 34 installed in the main bus section is also shown in FIG.
The same configuration as that described above is provided, and a dug portion 36 is provided and installed.

The circuit breaker side lightning arrester 5 configured as shown in FIG.
6. When it is difficult to secure an installation space above the connection bus 55 or the main buses 32A, 32B at the installation position, the bus arrestor 34 is provided with engraved portions 35 and 36 below so that the zinc oxide element is disposed below the bus. In the same manner as in the first embodiment, since the connection bus 55 is connected in series, no space is required for installation. When the bus-bar lightning arrester 34 provided at the main buses 32A and 32B is made to have the same configuration as the circuit breaker-side lightning arrester 56 shown in FIG. Since it can be arranged, the installation space as a gas insulated switchgear can be reduced.

Embodiment 3 The third embodiment is different from the first embodiment in that a portion provided with a bus connecting portion 46e of a sealed container 46a of a circuit breaker-side lightning arrester 46 of FIG.
Can be divided.
The configuration is shown in FIG. In FIG. 10, reference numeral 91 denotes a lightning arrester on the circuit breaker side obtained by dividing an airtight container.
6b, connection electrodes 46c, insulating support insulators 46d, bus connecting portions 46e, insulating spacers 46f, connecting conductors 46g, and gantry 46h are the same portions as those of the first embodiment shown in FIG. Is a configuration in which the container is housed in a closed container 92 divided into a closed container upper portion 92a and a closed container lower portion 92b.

With the configuration in which the gas-insulated lightning arrester 91 is broken down during operation by being configured to be housed in the sealed container 92 divided into two as described above, the sealed container lower portion 92b of the sealed container 92
Can be replaced with the bus bar attached, and the zinc oxide element 46b, the connection electrode 46c, the insulating support insulator 46d, and the connection conductor 46g are removed with a short stop, and the connection conductor 93 as shown in FIG. And the connecting electrode 46c and the bus connecting portion 46e via the sliding contact 93a.
By connecting between the insulating spacers 46f and sealing with the lid 94 and filling with the insulating gas, the gas insulated switchgear can be recovered and the operation can be continued as soon as possible.

In the case where spare parts for the circuit breaker side lightning arrester 46 and the bus lightning arrester 33 are held, it is possible to recover by replacing only the contents of the lightning arrester, and to recover the insulating gas from the adjacent bus part. Is also unnecessary, and it is possible to respond promptly by working only with the lightning arrester, and there is an advantage that the bus stop time of the substation is shortened.

Further, when the construction of the substation at the beginning of construction is simple, and thereafter the construction of the substation becomes large-scale and insulation coordination is required over a wide range, the construction of the bus arrester 34 is first changed to FIG. If the airtight container lower part 92b is provided in the bus portion as described above and the zinc oxide element 46b of the gas insulated lightning arrester 91 is added when it becomes necessary to install the lightning arrester, the work of adding the bus lightning arrester can be performed. Since this is possible with a short bus stop, planned capital investment in substations is possible.

Embodiment 4 FIG. The fourth embodiment has a configuration in which a bellows is provided at the bus connecting portion of the configuration of FIG. 5 of the first embodiment. FIG. 12 shows the configuration of the fourth embodiment. In FIG. 12, reference numeral 95 denotes a gas-insulated lightning arrester,
a, a zinc oxide element 46b, a connection electrode 46c, an insulating support base 46d, a bus connecting portion 46e, an insulating spacer 46f, and a connecting conductor 46g are configured in the same manner as in FIG. 5, and a bellows 96 is attached to one of the bus connecting portions 46e. And a connection conductor 95 between the connection electrode 46c and the bus connection 46e on the side where the bellows 46 are arranged.
The connection is made via a sliding contact 95t by g.

If the circuit breaker side lightning arrester 46 or the bus bar lightning arrester 33 shown in FIG. 1 is configured as the gas insulated lightning arrester 95 shown in FIG. 12, if the gas insulated lightning arrester 95 becomes defective for some reason and needs to be removed, By disconnecting the connection with the busbar portion and compressing the bellows 96, the gas-insulated surge arrester can be replaced without disassembling the adjacent busbar portion on both sides, and the stoppage of the busbar portion can be processed in a short time. . Bellows 96 are busbar connection parts 4 on both sides
6e, the trouble handling work can be performed more easily.

The bellows 96 of FIG. 12 has flanges at both ends and is connected by bolts. However, by welding one of the bellows to the closed container, the number of sealing portions in the closed container 46 is reduced. It can be made small as a gas-insulated surge arrester.

The configuration in which the bellows 96 is added in FIG. 12 is a case where the zinc oxide element 46b is arranged above the bus bar portion. However, in the case of FIG. 9 of the second embodiment and FIG. 10 of the third embodiment, Similarly, by providing a bellows at the bus connecting portion, the bellows is compressed as in the case of FIG. 12, so that the gas insulated lightning arrester can be replaced without disassembling the bus bars on both sides.

Embodiment 5 FIG. FIG. 1 shows the configuration of the fifth embodiment.
3 is shown. Embodiment 5 is a gas-insulated lightning arrester in which a main bus portion or a connection bus portion is partly integrated with a part of a bus of a gas-insulated switchgear arranged vertically. In FIG. 13, reference numeral 38 denotes a bus arranged in the vertical direction. 97 is a gas-insulated lightning arrester, which is a zinc oxide element 4
6b, the connection electrode 46c, the insulation support base 46d, the busbar connection portion 46e, the insulation spacer 46f, and the connection conductor 46g are shown in FIG.
And housed in a closed container 98,
, And is supported by the gantry 99 at right angles.

When the gas insulated surge arrester is configured in this way,
For example, the gas insulated switchgear can be connected to a vertical bus portion when the line unit portion or the transformer unit portion shown in FIG. The degree of freedom in the layout design of the gas insulated switchgear is increased, and the gas insulated switchgear can be easily downsized and the installation space can be reduced.

Embodiment 6 FIG. In the sixth embodiment, a connection conductor between the connection electrode of the circuit breaker side lightning arrester 46 or 56 or the bus bar lightning arrester 33 or 34 of the first to fifth embodiments and the insulating spacer of the bus connection portion provided on both sides of the sealed container is provided.
The conductor has the same cross section as the bus bar to be connected, and has a configuration in which the center electrodes of the insulating spacers on both sides of the sealed container are connected to each other by one through conductor through the connection electrode.

Since the center electrodes of the insulating spacers are connected by one through conductor, the gas-insulated lightning arrester can be easily assembled, and the gas-insulated lightning arrester can be constructed at a low cost.

[0046]

According to a first aspect of the present invention, there is provided a gas-insulated surge arrester having a plurality of stacked zinc oxide elements, an insulating support insulator for supporting the zinc oxide elements, and a plurality of stacked zinc oxide elements and an insulating support. A connection electrode disposed between the insulator and the central portion of the closed container is disposed, and insulating spacers having center electrodes on both sides facing the connection electrode of the closed container are disposed, and a bus portion of the gas insulated switchgear is disposed. A bus connection portion is provided by dividing the gas, and the connection electrode and the center electrode of the insulating spacer of the bus connection portion are connected by a connection conductor, so that a branch bus for connecting the gas insulated surge arrester to the connection bus is provided. It becomes unnecessary, and the installation space for the lightning arrester is almost unnecessary,
When it is provided in the main bus portion, the space between the main buses can be arranged closely without being widened to provide the lightning arrester, so that the installation space as the gas insulated switchgear can be reduced.

In a gas-insulated surge arrester according to a second aspect of the present invention, the plurality of zinc oxide elements having the structure of the first aspect are vertically stacked and disposed above and below the busbar connection portion of the sealed container. Insulating support insulators are arranged in the, and connection conductors connecting between the connection electrodes and the busbar connection part are arranged in the horizontal direction. Almost no space is required, and the gas insulated switchgear can be configured to be small and inexpensive.

In the gas insulated lightning arrester according to claim 3 of the present invention, the bus connecting portion of the sealed container and the accommodating portion of the zinc oxide element are configured to be separable. The inside can be replaced while the lower part of the sealed container is attached to the bus bar, and can be restored with a short stop. In addition, by temporarily removing the internal member and filling with the insulating gas, the gas insulated switchgear can be recovered and the operation can be continued as soon as possible. further,
When the substation was initially constructed, it was operated without arresters on the busbar.If the substation configuration was large and insulation coordination was required over a wide area, it was easy to add arresters. Planned capital investment.

According to a fourth aspect of the present invention, there is provided a gas insulated lightning arrestor, wherein the plurality of zinc oxide elements having the structure of the first aspect are vertically stacked and disposed below and inside the bus connecting portion of the sealed container. Insulating support insulators are placed in the space, and the connection conductors connecting the connection electrodes and the busbar connection part are arranged in the horizontal direction, so even if installation space cannot be secured above the installation position, the installation space Is almost unnecessary, and even when the main bus is provided, the main bus can be disposed close to the lightning arrester without providing a large space between the lightning arresters, and the installation space as the gas insulated switchgear can be reduced.

According to a fifth aspect of the present invention, there is provided a gas-insulated lightning arrester, wherein the bus connecting portions disposed on both sides of the closed container according to the first to fourth aspects have an angle corresponding to the direction of the connected bus. , It is not necessary to bend the connection bus, and the connection bus can be constituted only by the inexpensive straight portion, and the economical efficiency of the branch bus is improved.

In the gas insulated lightning arrester according to claim 6 of the present invention, at least one bus connecting portion of the sealed container according to any one of claims 1 to 5 is provided with a bellows between the side of the sealed container. With this configuration, if a failure occurs in the gas insulated lightning arrester, the bellows can be compressed to replace the gas insulated lightning arrester without disassembling the busbar parts on both sides, and the busbar part can be stopped in a short time. Can be processed.

A gas-insulated surge arrester according to a seventh aspect of the present invention is the gas-insulated lightning arrester according to the first aspect, wherein the plurality of zinc oxide elements are stacked in a horizontal direction, and one end is located at one end side from the busbar connection portion inside the sealed container. The connecting conductor that connects the connecting electrode and the busbar connecting part is arranged vertically, so that the line unit part of the gas insulated switchgear or the transformer is arranged. The installation position of the unit can be higher than the installation level of the main bus, and it can be connected to the vertical bus in the case of multi-stage arrangement, and the degree of freedom in the layout design of the gas insulated switchgear increases, The insulated switchgear can be easily reduced in size and installation space.

In a gas-insulated surge arrester according to claim 8 of the present invention, the connection conductor having the same cross section as that of the bus is provided between the connection electrode and the bus connection on both sides of the sealed container. Is penetrated through the connection electrode so that the center electrodes of the insulating spacers on both sides are connected to each other, so that the gas arrestor can be easily assembled as a gas insulated lightning arrester and can be inexpensively configured as a gas insulated lightning arrester.

[Brief description of the drawings]

FIG. 1 is an example of a single line diagram of a gas insulated switchgear of a UHV class substation.

FIG. 2 is a plan view of a line unit and a transformer unit in which the single line diagram of FIG. 1 is configured in the gas insulated switchgear.

FIG. 3 is a side view of a case where the gas insulated lightning arrestor of the line unit portion of FIG. 2 is arranged facing upward of a bus.

FIG. 4 is a side view of a first main bus line portion of FIG. 2;

FIG. 5 is a cross-sectional view illustrating a configuration of the gas-insulated lightning arrester of the first embodiment.

FIG. 6 is a cross-sectional view of the gas-insulated lightning arrester when the bus connection portion has an angle.

FIG. 7 is a side view of the case where the gas insulated lightning arrester of the line unit portion of FIG. 2 is arranged facing down the bus.

FIG. 8 is a side view of a second main bus line portion of FIG. 2;

FIG. 9 is a cross-sectional view illustrating a configuration of a gas-insulated lightning arrester according to a second embodiment.

FIG. 10 is a cross-sectional view illustrating a configuration of a gas-insulated lightning arrester according to a third embodiment.

FIG. 11 is a cross-sectional view of the gas-insulated lightning arrester of FIG. 10 with an internal housing member removed.

FIG. 12 is a cross-sectional view illustrating a configuration of a gas-insulated lightning arrester according to a fourth embodiment.

FIG. 13 is a cross-sectional view illustrating a configuration of a gas-insulated lightning arrester according to a fifth embodiment.

FIG. 14 is a plan view of a conventional UHV gas insulated switchgear.

FIG. 15 is a side view of the bus connection unit of FIG. 14;

FIG. 16 is a cross-sectional view illustrating a configuration of a conventional gas-insulated lightning arrester.

FIG. 17 is a plan view showing a configuration of a conventional UHV gas insulated switchgear when connected to an overhead power transmission line.

FIG. 18 is a side view of FIG.

[Explanation of symbols]

31A first main bus A section, 31B first main bus B section, 32A second main bus A section, 32B second main bus B section, 33 bus lightning arrester, 34 bus lightning arrester,
35 engraving part, 36 engraving part, 37 transformer, 39
Secondary side switchgear, 40 line unit, 41 circuit breaker,
42 current transformer, 43B bus-side disconnector, 43L line-side disconnector, 44 ground switch, 45 connection bus, 46 circuit breaker-side lightning arrester, 46a closed vessel, 46b zinc oxide element, 46c connection electrode, 46d insulating support insulator, 46e
Busbar connection part, 46f insulating spacer, 46g connection conductor, 46h mounting, 47 line side lightning arrester, 48 voltage transformer, 49 bushing, 50 line unit, 55
Connection conductor, 56 lightning arrester on circuit breaker side, 56a sealed container,
56b zinc oxide element, 56c connection electrode, 56d insulating support insulator, 56e bus connecting part, 56f insulating spacer, 56g connecting conductor, 56h mounting, 60 transformer unit, 61 breaker, 62 current transformer, 63B bus-side disconnector, 64 Transformer side disconnector, 65 Connection conductor, 66
Transformer side lightning arrester, 70 busbar connection unit, 71 circuit breaker, 72 current transformer, 73 disconnector, 74 ground switch, 75 connection conductor, 80 busbar division unit, 81
Circuit breaker, 82 current transformer, 83 disconnector, 84 ground switch, 88 voltage transformer, 91 gas insulated surge arrester, 92
Sealed container, 93 connection conductor, 94 lid, 95 gas insulated lightning arrester, 95 g connection bus, 95 t sliding contact, 96
Bellows, 97 gas-insulated surge arrester, 98 sealed container,
99 trestle.

Continued on the front page (72) Inventor Tsutomu Egashira 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation F-term (reference) 5E034 EA07 EB02 EB03 EB10 EC01 5G017 AA02 AA07 AA33 BB09 FF02 FF05 JJ02

Claims (8)

[Claims] 1. A stacked plurality of zinc oxide elements, an insulating support insulator supporting the zinc oxide element, and a connection electrode disposed between the stacked zinc oxide elements and the insulating support insulator are hermetically sealed. An insulating spacer having a center electrode disposed on both sides of the closed container which is opposed to the connection electrode of the closed container is provided, and a bus connection portion which is gas-separated from a bus portion of the gas insulated switchgear is provided. A gas insulated lightning arrester characterized in that an electrode and a center electrode of an insulating spacer at each busbar connection portion are connected by a connection conductor. 2. A plurality of zinc oxide elements are stacked in a vertical direction and are disposed above and below a bus connecting portion of an airtight container, and an insulating support insulator is disposed below and below, and connect between the connection electrode and the bus connecting portion. The gas-insulated surge arrester according to claim 1, wherein the connecting conductors are arranged in a horizontal direction. 3. The gas insulated lightning arrester according to claim 2, wherein the bus connecting portion of the sealed container and the housing portion of the zinc oxide element are configured to be separable. 4. A plurality of zinc oxide elements are stacked in a vertical direction, disposed below and inside a bus connecting portion of the sealed container, and an insulating support insulator is disposed inside and above the connecting member, and connect between the connection electrode and the bus connecting portion. The gas-insulated surge arrester according to claim 1, wherein the connecting conductors are arranged in a horizontal direction. 5. The busbar connecting part disposed on both sides of the closed container is disposed at an angle corresponding to the direction of the busbar to be connected. A gas insulated surge arrester as described in Crab. 6. The gas according to claim 1, wherein a bellows is provided between at least one bus connecting portion of the closed container and a side portion of the closed container. Isolated lightning arrester. 7. A plurality of zinc oxide elements are stacked in a horizontal direction, arranged on one end side from a bus connecting portion of the sealed container, and an insulating support insulator is arranged on the other end side, and a gap between the connection electrode and the bus connecting portion is provided. The gas-insulated surge arrester according to claim 1, wherein the connecting conductors to be connected are arranged in a vertical direction. 8. A connection conductor having a cross section equivalent to that of the bus is penetrated through the connection electrode between the bus connection portions disposed on both sides of the closed container, and the center electrodes of the insulating spacers on both sides are connected. The gas insulated surge arrester according to any one of claims 1 to 7, wherein: