JP4416667B2 - Gas insulated switchgear - Google Patents

Description

  The present invention relates to a gas-insulated switchgear, and more particularly to a gas-insulated switchgear installed in an electric station such as a power plant or a substation.

  Gas-insulated switchgear installed in power stations such as power stations and substations houses switches such as busbars, circuit breakers, disconnecting switches, and grounding switches in a high-pressure vessel filled with insulating gas. The container is grounded. In the gas insulated switchgear connected to the aerial power transmission line, it is connected to the aerial power transmission line side by providing a bushing portion.

  The bushing in this type of gas-insulated switchgear employs a configuration in which the bushings are spaced apart from each other at the front end side of the transmission line in order to ensure an air insulation distance between the phases (for example, Patent Document 1). reference.).

Japanese Patent Laid-Open No. 7-123544

  In this type of gas-insulated switchgear, when there are multiple connections to the air transmission line side, it is necessary to secure an air insulation distance between adjacent bushings. Therefore, the installation area of the connecting bus between the bushing and the bus is inevitably increased.

  The increase in the installation area for installing multiple bushings and the connection bus installation area between the bushings and the busbars increases the concrete area as the foundation, which increases the equipment maintenance costs and the installation costs. Become enormous.

  On the other hand, the user side is required to reduce the installation area and reduce the maintenance cost and the installation cost, but there is no solution at present.

  An object of the present invention is to provide a gas-insulated switchgear that can reduce the installation area and reduce the maintenance cost and the installation cost.

In order to achieve the above object, the present invention provides a gas insulated switchgear having a connecting bus and a bushing portion on a power transmission line side of a switch. The connecting bus provided on the electric wire side, the intermediate- phase bushing connecting portion provided so as to rise upward perpendicularly to the axis of the connecting bus, and the bushing connecting portion of both ends rising vertically from the side surface of the connecting bus The intermediate phase bushing provided in the intermediate phase bushing connection portion so that the upper portion is inclined toward the transmission line side, and the both ends so that the upper portion is inclined in the direction away from the intermediate phase on the anti-transmission line side. The end-phase bushings provided in the phase bushing connection portions, the lightning arresters arranged on the power transmission line side through the branch portions in the respective phase bushing connection portions, and the branch portions in the bushing connection portions in the respective phases In the gas insulated switchgear is characterized in that a voltage transformer arranged in the counter-transmission line side.

The second invention is a gas-insulated switchgear having a connection bus and a bushing on the power transmission line side of the switch, the connection bus provided on the power transmission line side of the switch perpendicular to the main bus, A middle- phase bushing connection provided so as to rise upward perpendicular to the axis of the connection bus, a bushing connection of both phases rising vertically from the side surface of the connection bus, and the upper part toward the non-transmission line side An intermediate phase bushing provided in the intermediate phase bushing connection portion so as to be inclined, and an end phase provided in the bushing connection portion of the both end phases so that the upper portion is inclined toward the transmission line side and away from the intermediate phase. Bushings, lightning arresters arranged on the power transmission line side via a branching part in the bushing connection part of each phase, and instrument transformers arranged on the anti-power transmission line side via a branching part in the bushing connection part of each phase In the gas insulated switchgear, characterized in that it comprises and.

Furthermore, the third invention is a gas-insulated switchgear that is installed adjacent to two lines and has a connection bus and a bushing portion on the power transmission line side of the switch, and each line is a main bus on the power transmission line side of the switch. The connecting bus provided orthogonally, the intermediate-phase bushing connecting portion provided so as to rise upward and perpendicular to the axis of each connecting bus, and the bushing connection of both phases rising vertically from the side surface of each connecting bus away parts and, and the bushing of upper middle phase provided in the bushing connecting portion of the in-phase of the one connecting bus side to be inclined toward the transmission line side, the middle and the upper counter-transmission line side phase The end-phase bushings provided in the bushing connection portions of the both-end phases on the one connection bus side so as to incline in the direction, and the one connection bus-line so that the upper portion inclines toward the non-transmission line side. Next to Square and of the middle phase bushing provided in the bushing connecting portion of the in-phase connection bus side, top the other to Neighboring said one connection busbar to be inclined in a direction away from the power transmission line side a and the medium phase End-phase bushings provided in the bushing connection portions of the both-end phases on the connection bus side, lightning arresters arranged on the power transmission line side via branch portions in the bushing connection portions of the phases, and the bushing connections of the phases A gas-insulated switchgear characterized by comprising an instrument transformer disposed on the side opposite to the power transmission line via a branching section.

  According to a fourth aspect of the present invention, in the gas insulated switchgear according to any one of the first to third aspects of the invention, the bushing connection portion includes a branch tank branched from a connection bus and a branch portion connected to the branch tank. The gas insulated switchgear is characterized by comprising.

According to a fifth aspect of the present invention, in the gas-insulated switchgear according to any one of the first to third aspects, the middle-phase bushing upper voltage applying unit and the two end-phase bushing upper voltage-imparting units are arranged from directly above. The gas insulated switchgear is characterized in that it is arranged at each vertex of an equilateral triangle.

  According to the present invention, the space required for the installation of the bushing and the length of the connection busbar can be shortened by the arrangement configuration that secures the inter-phase insulation distance of the bushing. It is possible to reduce the facility cost, maintenance cost, etc. significantly.

Hereinafter, embodiments of the gas insulated switchgear according to the present invention will be described with reference to the drawings.
1 is a plan view showing an embodiment of a gas insulated switchgear according to the present invention, FIG. 2 is a front view of FIG. 1, and FIG. 3 is an enlarged cross-sectional view as seen from the direction of arrows III-III in FIG. In these drawings, a bus bar 2 is installed on the installation foundation 1. The bus 2 constitutes a gas-insulated main bus in which a bus conductor is disposed in a tank and an insulating gas is sealed inside the bus.

  A power transmission line 3 is branched from the bus 2 perpendicularly to the main bus 2 as shown in FIG. The power transmission line 3 includes a gas-insulated branch bus 4 connected to the three-phase bus conductor of the bus 2, a three-phase gas-insulated connection bus 5 connected to the branch bus 4, and a connection bus 5 The power transmission line side bushing unit 6 to be connected is provided and disposed on the installation foundation 1.

  The gas-insulated branch bus 4 includes disconnectors 7 installed on the bus 2 so as to be connected to the three-phase bus conductors, circuit breakers 8 connected to the disconnectors 7, and the circuit breakers 8. A current transformer 9 provided on each side and a disconnector 10 connected to the current transformer 9 on the power transmission line side are sequentially arranged toward the power transmission line side.

  As shown in FIG. 3, a middle-phase bushing connection portion 11 provided in the vertical direction and a bushing connection portion 12 in both end phases rising in the vertical direction from the side are provided at the ends of the connection bus 5 in the power transmission line-side bushing portion 6. , 13 are provided. The intermediate phase bushing connection portion 11 is provided with a branch portion 14, and the both-end bushing connection portions 12 and 13 are provided with branch portions 15 and 16.

  As shown in FIG. 1, the lightning arrester 17 is opposed to the intermediate phase branching portion 14 and the end phase branching portions 15 and 16, and the instrument transformer 18 is opposed to the connecting bus 5 side. 2 are installed at the same height. In this example, the instrument transformer 18 is installed in all three phases, but may be installed in only one of the phases.

  As shown in FIG. 3, the middle-phase branch portion 14 and the end-phase branch portions 15 and 16 are respectively provided with connection ports 19, 20, and 21 for bushing connection. Bushings 25, 26, and 27 are installed at these connection ports 19, 20, and 21 via bushing support portions 22, 23, and 24, respectively.

  The middle-phase bushing 26 is inclined so that the upper portion thereof is positioned in the direction of the center line of the connection bus 5 and on the power transmission line side. Further, the bushings 25 and 27 of the end phases are inclined so that the upper portions thereof are located on the connection bus 5 side (the anti-power transmission line side) and in the direction away from the middle phase. Due to the arrangement of these bushings 25, 26, 27, the power application section at the tips of these bushings 25, 26, 27 is arranged at the vertices of the triangle when viewed from directly above as shown in FIG.

  As shown in FIG. 1, the lightning arresters 17 for each phase are arranged in parallel on the power transmission line side of the bushing connection portion. An accessory box 28 of the lightning arrester 17 is installed on the power transmission line side of the lightning arrester 17 of each phase. Conventionally, the installation positions of the lightning arresters 17 of the respective phases are also separated due to the air insulation distance of the bushing. However, by using the configuration of the present invention, the installation positions between the lightning arresters 17 of the respective phases are close. Becomes easier.

  Further, a gas monitoring device for monitoring the gas pressure inside the bushing unit 6 is connected to the bushings 25 to 27, the bushing connection units 11 to 13, the lightning arrester 17 and the instrument transformer 18 at one place in the vicinity of the bushing unit 6. 29 is installed. Conventionally, since the installation positions of the bushings of each phase, the lightning arrester, and the instrument transformer are separated by the air insulation distance of the bushings, the gas monitoring device 29 is also installed for each phase, but the configuration of the present invention is used. This makes it possible to easily connect the devices of each phase by gas piping, and the gas monitoring device 29 can also be integrated into one place with three phases. Thereby, the gas pressure inspection work of each apparatus of a bushing part becomes easy.

Next, the operation of the above-described embodiment of the gas insulated switchgear according to the present invention will be described with reference to FIGS.
At the end of the connection bus 5 in the power transmission line side bushing section 6, as shown in FIG. 3, a middle phase bushing connection section 11 provided in the vertical direction, a bushing connection section 12 of both end phases rising in the vertical direction from the side, 13 is provided. Bushings 25, 26, 27 are installed in these bushing connection portions 11, 12, 13 via bushing support portions 22, 23, 24, respectively, and an upper portion of the intermediate phase bushing 26 is connected to the connection bus 5. It inclines so that it may be located in the center line direction and the power transmission line side. Further, the bushings 25 and 27 of the end phases are inclined so that the upper portions thereof are located on the connection bus 5 side (the anti-power transmission line side) and in the direction away from the middle phase.

  Due to the arrangement of these bushings 25, 26, 27, the power application section at the tip of these bushings 25, 26, 27 is arranged at the apex of the triangle when viewed from directly above as shown in FIG. The insulation distance between the bushing heads in the air can be secured to the maximum.

  On the other hand, the base side of the bushing is concentrated at the end of the connection bus 5, so that the installation area and the foundation concrete installation area are reduced, and the equipment cost and maintenance cost can be reduced.

  In addition, since the lightning arrester 17 and the instrument transformer 18 can be centrally arranged at the end of the connection bus 5, the monitoring and maintenance are improved.

  According to the embodiment of the present invention, the arrangement configuration of the bushings 25, 26, 27 described above can secure the inter-phase air insulation distance, and the installation area is reduced. Work and costs can be reduced.

  4 and 5 show another embodiment of the transmission line side bushing in the gas insulated switchgear of the present invention, FIG. 4 is a plan view thereof, FIG. 4 is a front view thereof, and in these drawings, 1 to 3 are the same or corresponding parts. In this embodiment, the middle-phase bushing 26 is installed so as to be inclined so that the upper portion thereof is located in the direction of the center line of the connection bus 5 and on the connection bus 5 side (the anti-transmission line side). The bushings 25 and 27 are installed so as to be inclined so that their upper portions are located on the power transmission line side and away from the middle phase. As shown in FIG. 4, the power application section at the tip of these bushings 25, 26, and 27 is arranged at the apex of the triangle when viewed from directly above as shown in FIG. 4.

  According to this embodiment, the power transmission section drawn into this is connected to the power application section at the tip of the bushings 25, 26, 27. As described above, the bushings 25, 27 in the end phase are intermediate phases. As a result of the inclined arrangement so as to face the bushing 23, the inter-air insulation distance between the bushings 25, 26 and 27 can be secured as much as possible.

  The length of the connecting bus connected to the bushings 25, 26, 27 is shortened by the arrangement of the bushings 25, 26, 27 described above. As a result, similarly to the above-described embodiment, the installation area is reduced, and accordingly, the work and cost for the installation work can be reduced.

  FIG. 6 is a plan view showing another embodiment of the gas-insulated switchgear according to the present invention, in which the same reference numerals as those in FIGS. 1 to 5 denote the same or corresponding parts. In this embodiment, in the power transmission circuit including the bus 2, the bus connection line 30, the transformer line 32 to the transformer 31, and the two power transmission lines 3, 3, one of the two power transmission lines 3, 3 The transmission line side bushing 6 is inclined so that the upper part thereof is located in the direction of the center line of the connection bus 5 and on the transmission line side, as shown in FIGS. It is arranged and configured with end-phase bushings 25 and 27 that are inclined so as to be located in the direction away from the middle phase on the side of the connecting bus 5 (on the side opposite to the transmission line), and the transmission line-side bushing 6 on the other side. 4 and FIG. 5 are installed so that the middle-phase bushing 26 is inclined so that the upper portion thereof is located in the direction of the center line of the connection bus 5 and on the connection bus 5 side (the anti-transmission line side). Also, the bushings 25 and 27 of the end phase Parts are those constituted by inclined to installed so as to be located away from the power transmission line side a and the medium phase.

  According to this embodiment, it is possible to install the transmission line side bushing 6 that secures the inter-phase air insulation distance as much as possible at the front end side of the transmission line that branches off from the bus 2, as well as the transmission line arranged in parallel. Since the air insulation distance between the transmission line side bushings 6 and 6 on the front end side of the electric wire line can be secured, the installation area can be reduced, and the work and cost for the installation work can be reduced. .

  In addition, since the lightning arrester 17 and the instrument current transformer 18 can be centrally arranged at the end of the connection bus 5, its monitoring and maintenance are improved.

  In the above-described embodiment, the branch portions 14, 15 and 16 are provided in the bushing connection portion 11 of the medium phase and the bushing connection portions 12 and 13 of the both end phases, respectively, but the intermediate phase bushing connection portion 11, It is also possible to integrally form the bushing connecting portions 12 and 13 at both ends. Moreover, in the above-mentioned embodiment, although the example which provided the two bus-bars 2 was shown, it is applicable also to the example in the case of one.

It is a top view which shows one Embodiment of the gas insulated switchgear of this invention. It is a front view of one Embodiment of the gas insulated switchgear of this invention shown in FIG. It is the expanded sectional view which looked at the gas insulated switchgear of the present invention shown in Drawing 2 from the III-III arrow. It is a top view which shows other embodiment of the power transmission line side bushing in the gas insulated switchgear of this invention. It is a front view of other embodiment of the power transmission line side bushing in the gas insulated switchgear of this invention shown in FIG. It is a top view of other embodiment of the gas insulated switchgear of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Basic concrete 2 Main bus 3 Transmission line 4 Gas insulation branch bus 5 Connection bus 6 Bushing part 11 Middle phase bushing connection part 12 End phase bushing connection part 13 End phase bushing connection part 14 Middle phase branch part 15 End Phase bifurcation 16 End phase bifurcation 26 Middle phase bushing 25 End phase bushing 27 End phase bushing

Claims (5)

In a gas insulated switchgear having a connecting bus and a bushing on the power transmission line side of the switch,
The connecting bus provided on the power transmission line side of the switch perpendicular to the main bus,
A mid- phase bushing connection provided to rise upward perpendicular to the axis of the connection bus;
A bushing connection portion of both end phases rising vertically from the side surface of the connection bus;
And middle phase bushing top provided in the bushing connecting portion of the in-phase so as to be inclined toward the transmission line side,
A bushing of an end phase provided on each of the bushing connection portions of the both end phases so that the upper part is inclined in the direction away from the middle phase on the side opposite to the power transmission line;
A lightning arrester arranged on the power transmission line side through a branching part to the bushing connection part of each phase,
A gas insulated switchgear comprising a bushing connection part for each phase and an instrument transformer arranged on the side opposite to the power transmission line via a branch part. In a gas insulated switchgear having a connecting bus and a bushing on the power transmission line side of the switch,
The connecting bus provided on the power transmission line side of the switch perpendicular to the main bus,
A mid- phase bushing connection provided to rise upward perpendicular to the axis of the connection bus;
A bushing connection portion of both end phases rising vertically from the side surface of the connection bus;
And middle phase bushing top provided in the bushing connecting portion of the in-phase so as to be inclined toward the non transmission line side,
A bushing of an end phase provided on each of the bushing connection portions of the both end phases so that the upper part is inclined in a direction away from the middle phase on the transmission line side;
A lightning arrester arranged on the power transmission line side through a branching part to the bushing connection part of each phase,
A gas insulated switchgear comprising a bushing connection part for each phase and an instrument transformer arranged on the side opposite to the power transmission line via a branch part. In a gas-insulated switchgear that is installed adjacent to two lines and has a connection bus and a bushing on the power transmission line side of the switch,
Each connection line provided perpendicular to the main bus on the power transmission line side of the switch,
A middle-phase bushing connection provided to rise perpendicularly to the axis of each connection bus; and
A bushing connection portion of both end phases rising vertically from the side surface of each connection bus;
And middle phase bushing top provided in the bushing connecting portion of the in-phase of the one connecting bus side to be inclined toward the transmission line side,
The bushing of the end phase provided in the bushing connection part of the both end phases on the one connection bus side so that the upper part is inclined in the direction away from the middle phase on the side opposite to the power transmission line,
And middle phase bushing top provided in the bushing connecting portion of the in-phase other connection bus side to Neighboring on the one connection bus to be inclined toward the non transmission line side,
A bushing of an end phase provided respectively in the bushing connection portion of the both end phases on the other connecting bus side adjacent to the one connecting bus so that the upper part is inclined in a direction away from the middle phase on the power transmission line side;
A lightning arrester arranged on the power transmission line side through a branching part to the bushing connection part of each phase,
A gas insulated switchgear comprising a bushing connection part for each phase and an instrument transformer arranged on the side opposite to the power transmission line via a branch part.   The gas insulated switchgear according to any one of claims 1 to 3, wherein the bushing connection portion is constituted by a branch tank branched from a connection bus and a branch portion connected to the branch tank.   4. The medium-phase bushing upper voltage applying section and the two end-phase bushing upper voltage applying sections are arranged at respective vertices of a substantially equilateral triangle when viewed from directly above. The gas insulated switchgear described.

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