JP2017147908A - Gas-insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas-insulated switchgear achieving a reduction in installation area without impairing high reliability.SOLUTION: A first main bus line 1 and a second main bus line 2 are disposed in parallel with a predetermined interval. In first, second and third circuit breaker units 21 through 23, vertical breakers are individually used for first, second and third breakers 3 through 5, and main spindles of the units are disposed so as to be vertical to the first main bus line 1 and the second main bus line 2. The first circuit breaker unit 21 and the second circuit breaker unit 22 are disposed outside the first main bus line 1. The third circuit breaker unit 23 is disposed outside the second main bus line 2, and is coaxially disposed with the second circuit breaker unit 22.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a 1 · 1 / 2CB gas-insulated switchgear.

  In general, in high-voltage substations where systems are concentrated and particularly high reliability is required, so-called 1/1 / 2CB gas insulated switchgear is adopted as the busbar system. A conventional 1 · 1 / 2CB gas-insulated switchgear will be described with reference to FIGS. As shown in the single line connection diagram of FIG. 7, the first main bus 1 and the second main bus 2 are supplied with power from a first branch bus 12 and a second branch bus 13 connected to an external electric line.

  When a failure occurs in the main buses 1 and 2 or an external electric line, it is necessary to cut off only the failed part in order to connect the remaining buses or electric lines. Therefore, three vertical breakers, that is, the first breaker 3, the second breaker 4, and the third breaker 5 are connected between the main buses 1 and 2. Here, between the first circuit breaker 3 and the second circuit breaker 4, the first branch bus 12 that is electrically connected is branched. A second branch bus 13 that is electrically connected to each other is branched between the second circuit breaker 4 and the third circuit breaker 5.

  A first disconnector 6 and a second disconnector 7 are disposed at both ends of the first circuit breaker 3, and a third disconnector 8 and a fourth disconnector 9 are disposed at both ends of the second breaker 4. A fifth disconnector 10 and a sixth disconnector 11 are disposed at both ends of the circuit breaker 5. The first main bus 1 is connected to one end of the first circuit breaker 3 via a first disconnector 6, and the other end of the first circuit breaker 3 is connected to a second disconnector 7 and a third disconnector 8. One end of the second circuit breaker 4 is connected. One end of the third circuit breaker 5 is connected to the other end of the second circuit breaker 4 via a fourth disconnector 9 and a fifth disconnector 10. Further, the second main bus 2 is connected to the other end of the third circuit breaker 5 via a sixth disconnector 11.

  A unit having the first circuit breaker 3 and the first disconnector 6 and the second disconnector 7 at both ends thereof is referred to as a first circuit breaker unit 21, and the second circuit breaker 4 and third at both ends thereof. A unit having the disconnector 8 and the fourth disconnector 9 is referred to as a second circuit breaker unit 22, and a unit having the third breaker 5 and the fifth disconnector 10 and the sixth disconnector 11 at both ends thereof is the first. Three circuit breaker units 23 are provided.

  Here, a specific arrangement configuration of each of the circuit breaker units 21 to 23 will be described with reference to FIGS. 8 and 9. As shown in FIG. 8, the main circuit axes of the three circuit breaker units 21 to 23 are shared, and are sandwiched between the first main bus 1 and the second main bus 2 so that they are on the same axis. Has been placed. As shown also in FIG. 9, the first disconnector 6 is connected to the upper part of the first circuit breaker 3, and the first main bus 1 (shown in FIG. 8) is connected via the first disconnector 6.

  The upper end of the second circuit breaker 4 is connected to the lower end of the first circuit breaker 3 via the second disconnector 7, the connection bus 14 and the third disconnector 8. The lower end of the second circuit breaker 4 is connected to the lower end of the third circuit breaker 5 via the fourth disconnector 9, the connection bus 15 and the fifth disconnector 10. A second main bus 2 (shown in FIG. 8) is connected to the upper end of the third circuit breaker 5 via a sixth disconnector 11.

  The above 1 1 / 2CB gas-insulated switchgear uses 3 circuit breakers 3 to 5 to draw out 2 lines, and even if a bus accident occurs, only the faulty part is disconnected. And it does not affect the system. Also, the inspection of the circuit breaker and the like does not involve the stop of the track. Therefore, the 1 1 / 2CB gas-insulated switchgear is widely used in high-voltage substations where high reliability is required due to the concentrated system.

JP 2006-271021 A Japanese Patent No. 4966163

  In the conventional 1 1 / 2CB type gas insulated switchgear, the main shaft direction of the first to third circuit breaker units 21 to 23 is vertical and horizontal with the longitudinal direction of the first main bus bar 1 and the second main bus bar 2. Are arranged on the same axis. For this reason, the space between the main buses 1 and 2 needs to be large enough to accommodate three units, and the distance between the main buses 1 and 2 is wide. Therefore, in the gas insulated switchgear, the installation area tends to increase, and it has been an urgent task to reduce the installation area.

  The present invention has been proposed in order to solve the above-described problems of the prior art, and its purpose is to provide a gas insulated switchgear that reduces the installation area without impairing high reliability. There is to do.

In order to achieve the above object, a gas insulated switchgear according to an embodiment of the present invention includes the following components (1) to (8).
(1) Vertical first, second, and third circuit breakers electrically connected in series; first to sixth disconnectors attached to both ends of the first, second, and third circuit breakers; With three circuit breaker units. A unit having the first circuit breaker, the first disconnector and the second disconnector is a first circuit breaker unit, and the second circuit breaker, the third disconnector and the fourth disconnector are A unit having the second circuit breaker unit is referred to as a third circuit breaker unit. The unit including the third circuit breaker, the fifth disconnector, and the sixth disconnector is referred to as a third circuit breaker unit.
(2) A first main bus is connected to one end of the first circuit breaker via the first disconnector, and the second disconnector and the third disconnector are connected to the other end of the first circuit breaker. One end of the second circuit breaker is connected through the second circuit breaker, and the other end of the second circuit breaker is connected to one end of the third circuit breaker through the fourth disconnector and the fifth disconnector, A second main bus is connected to the other end of the third circuit breaker via the sixth disconnector.
(3) The first branch bus and the second branch bus that are electrically connected from the first circuit breaker and the second circuit breaker and from between the second circuit breaker and the third circuit breaker are branched. To do.
(4) An end device for external connection is connected to the ends of the first branch bus and the second branch bus.
(5) The first main bus bar and the second main bus bar are arranged in parallel at a predetermined interval.
(6) The circuit breaker units are arranged so that the main shaft of the unit is perpendicular to the main bus bars.
(7) The side opposite to the second main bus when viewed from the first main bus is the outside of the first main bus, and the side opposite to the first main bus when viewed from the second main bus is the second main bus. As the outside, the first circuit breaker unit and the second circuit breaker unit are arranged outside the first main bus bar.
(8) The third circuit breaker unit is disposed outside the second main bus bar.

The top view of a 1st embodiment. The side view of arrow AA of FIG. The side view of arrow BB of FIG. The top view of 2nd Embodiment. The side view of arrow AA of FIG. The side view of arrow BB of FIG. Single line connection diagram of a general gas insulated switchgear. A plan view of a conventional 1 1 / 2CB gas-insulated switchgear. The side view of arrow AA of FIG.

(1) First embodiment (configuration)
A first embodiment of a gas-insulated switchgear according to the present invention will be specifically described with reference to FIGS. The first embodiment is a 1 · 1 / 2CB gas-insulated switchgear, and the basic components are the same as those of the conventional gas-insulated switchgear shown in FIGS. For this reason, the same components are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIGS. 1 and 2, the first main bus 1 and the second main bus 2 are arranged horizontally and parallel to each other. The first main bus 1 and the second main bus 2 are composed of three-phase collective buses. The longitudinal direction of the first main bus 1 and the second main bus 2 is defined as the X direction, and the direction perpendicular to the X direction and horizontal is defined as the Y direction.

  As shown in FIG. 1, the first to third circuit breaker units 21 to 23 have three phases as a set, and the main shaft directions of the circuit breaker units 21 to 23 are the first main bus 1 and the second main bus 2. Are arranged so as to be vertical and horizontal with respect to the longitudinal direction (X direction). That is, the 1st-3rd circuit breaker units 21-23 are arrange | positioned so that a main axis direction may turn into a Y direction.

  The first circuit breaker unit 21 and the second circuit breaker unit 22 are parallel in the main axis direction, and after securing a space for inspection between the circuit breaker units 21 and 22, the first main busbar 1 and the second main circuit breaker unit 22 They are arranged adjacent to each other in the longitudinal direction of the busbar 2. Moreover, the 1st circuit breaker unit 21 and the 2nd circuit breaker unit 22 are on the outer side (upper side in FIG. 1) of the 1st main bus line 1 which becomes the opposite side to the 2nd main bus line 2 seeing from the 1st main bus line 1. Has been placed.

  The third circuit breaker unit 23 is disposed on the outer side (lower side in FIG. 1) of the second main bus 2 that is opposite to the first main bus 1 when viewed from the second main bus 2. Further, the main shaft of the second circuit breaker unit 22 and the main shaft of the third circuit breaker unit 23 are arranged on the same axis.

  As shown in FIGS. 2 and 3, each of the first to third circuit breakers 3 to 5 is a phase-separated and vertical circuit breaker. The 1st-3rd circuit breakers 3-5 which are vertical are arrange | positioned so that the longitudinal axis of the tank which accommodated the interruption | blocking part contact may become perpendicular | vertical, and the opening is provided in the upper part and the lower part of the tank.

  In the first to third circuit breakers 3 to 5, current transformers are connected to the upper and lower outlets of the tank, and first to sixth circuit breakers 6 to 11 having ground switches at the ends of the current transformers. Is connected. Among the first to sixth disconnectors 6 to 11, the first disconnector 6, the third disconnector 8, and the sixth disconnector 11 connected to the lower portion of the first to third breakers 3 to 5, It consists of an L-shaped disconnector. Moreover, the 2nd disconnector 7, the 4th disconnector 9, and the 5th disconnector 10 connected to the upper lead of the 1st-3rd circuit breakers 3-5 are comprised from the linear disconnector.

  As shown in FIG. 2, a first disconnector 6 is connected to the first main bus 1, and the first disconnector 6 is connected to the first disconnector 6 via a detachable device 16 that is detachable. It is connected to the outlet of the lower part of the circuit breaker 3. A second disconnector 7 is connected to the top of the first circuit breaker 3. A first branch bus 12 is connected to the second disconnector 7 via a connection bus 14. The first branch bus 12 extends in a direction orthogonal to the longitudinal direction of the first main bus 1 (upward in FIG. 1), and an end device for external connection, such as an overhead wire connection, is provided at the end of the first branch bus 12. Air insulation bushing etc. are connected.

  As shown in FIG. 3, a sixth disconnector 11 is connected to the second main bus 2, and the sixth disconnector 11 is connected to a lower outlet of the third breaker 5 via an attachment / detachment device 16. ing. A fifth disconnector 10 is connected to the top of the third circuit breaker 5. A fourth disconnector 9 is connected to the fifth disconnector 10 via a connection bus 15. The fourth disconnector 9 is disposed above the first main bus 1 and is connected to the upper lead of the second circuit breaker 4.

  A second branch bus 13 is connected below the connection bus 15. The second branch bus 13 extends in a direction orthogonal to the longitudinal direction of the second main bus bar, and extends in a direction opposite to the direction in which the first branch bus 13 extends (downward in FIG. 1). Is connected to an end device for external connection. The first branch bus 12 and the second branch bus 13 are composed of three-phase collective gas insulated buses.

(Action and effect)
In the first embodiment, the first to third circuit breakers 3 to 5 are phase-separated and vertical circuit breakers, and the first to third circuit breaker units 21 to 23 including such circuit breakers 3 to 5 are used. Are arranged such that the main axis direction is perpendicular to the longitudinal direction of the first main bus bar 1 and the second main bus bar 2 and is horizontal (Y direction in FIG. 1). The first circuit breaker unit 21 and the second circuit breaker unit 22 are arranged outside the first main bus bar 1, and the third circuit breaker unit 23 is arranged outside the second main bus line 2. .

  In the conventional arrangement of the 1 1/2 CB type gas insulated switchgear, as shown in FIGS. 8 and 9, the three circuit breaker units 21 to 23 are connected to the first main bus 1 and the second main bus 2. It is arranged so as to be sandwiched between. Therefore, the space | interval of the main buses 1 and 2 became wide, and the installation area increased.

  On the other hand, in the first embodiment, the three circuit breaker units 21 to 23 are arranged outside the main buses 1 and 2 instead of between the main buses 1 and 2, and the second circuit breaker unit. 22 and the third breaker unit 23 are arranged so that the main axes thereof are on the same straight line. The first circuit breaker unit 21 and the second circuit breaker unit 22 disposed outside the main bus 1 are disposed adjacent to each other in the longitudinal direction of the main buses 1 and 2. Further, a three-phase collective bus is applied to the main buses 1 and 2 and the branch buses 12 and 13. Therefore, the installation width in the Y direction in FIG. 1 can be remarkably reduced as compared with the conventional case, and the installation area can be greatly reduced.

  Moreover, in 1st Embodiment, since all the 1st-3rd circuit breakers 3-5 were arrange | positioned on the outer side of the main buses 1 and 2, the time of the inspection of the 1st-3rd circuit breakers 3-5 and an accident The heavy machinery used for work can be arranged near the first to third circuit breakers 3 to 5 at the time of time removal or restoration work. Therefore, it is possible to suspend the first to third circuit breakers 3 to 5 with a heavy machine smaller than the conventional one, and the operation cost can be kept low. Moreover, the first to third circuit breakers 3 to 5 do not pass over the main buses 1 and 2 when suspended by heavy machinery. Therefore, work efficiency is good and safety during work can be enhanced.

  Furthermore, although the 1st circuit breaker unit 21 and the 2nd circuit breaker unit 22 are arrange | positioned in parallel mutually, the direction where these units 21 and 22 are located in a line is the longitudinal direction of the main bus-line 1. FIG. Therefore, even if a space is provided, it does not lead to an increase in the installation area. Therefore, a space for inspection can be easily secured between the circuit breaker units 21 and 22. Moreover, in the first embodiment, since the attaching / detaching device 16 is arranged on the lower lead side of the circuit breakers 3 to 5, the circuit breakers 3 to 5 can be detached independently at the time of inspection or accident. As a result, the workability and safety of the circuit breakers 3 to 5 at the time of inspection or accidental removal and recovery work are further improved.

(2) Second embodiment (configuration)
A second embodiment will be described with reference to FIGS. The single-line diagram in the second embodiment is also the same as that of the general 1 · 1 / 2CB system shown in FIG. 9, and the basic configuration is the same as that in the first embodiment. For this reason, the same components are denoted by the same reference numerals and description thereof is omitted, and only differences from the first embodiment will be described.

  In the first embodiment described above, the main shaft of the second circuit breaker unit 22 and the main shaft of the third circuit breaker unit 23 are arranged on the same axis. However, in the second embodiment, as shown in FIG. The main shaft of the first circuit breaker unit 21 and the main shaft of the third circuit breaker unit 23 are arranged on the same axis. Further, the second circuit breaker unit 22 and the third circuit breaker unit 23 are arranged adjacent to each other in the longitudinal direction of the first main bus bar 1 and the second main bus bar 2.

  As shown in FIG. 5, a first disconnector 6 is connected to the first main bus 1, and the first disconnector 6 is connected to the first disconnector 6 via a detachable device 16 that is detachable from the first main bus 1. It is connected to the outlet of the lower part of the circuit breaker 3. A second disconnector 7 is connected to the top of the first circuit breaker 3. A first branch bus 12 is connected to the second disconnector 7 via a connection bus 14. The first branch bus 12 extends in a direction orthogonal to the longitudinal direction of the first main bus 1 (upward in FIG. 4), and an end device for external connection, such as an overhead wire connection, is provided at the end of the first branch bus 12. Air insulation bushing etc. are connected.

  As shown in FIG. 5, a sixth disconnector 11 is connected to the second main bus 2, and the sixth disconnector 11 is connected to a lower outlet of the third breaker 5 via an attachment / detachment device 16. ing. A fifth disconnector 10 is connected to the top of the third circuit breaker 5. A connection bus 15 is connected to the fifth disconnector 10.

  As shown in FIG. 6, the fourth disconnector 9 is connected to the connection bus 15. The fourth disconnector 9 is disposed above the first main bus 1 and is connected to the upper lead of the second circuit breaker 4. A second branch bus 13 is connected below the connection bus 15. The second branch bus 13 extends in a direction orthogonal to the longitudinal direction of the second main bus bar, and extends in a direction opposite to the direction in which the first branch bus 13 extends (downward in FIG. 4). Is connected to an end device for external connection. The first branch bus 12 and the second branch bus 13 are composed of three-phase collective gas insulated buses.

(Action and effect)
According to the second embodiment, as in the first embodiment, in the 1 · 1 / 2CB gas insulated switchgear, the three circuit breakers 3 to 5 are connected to the outside of the main buses 1 and 2. The first circuit breaker 3 and the third circuit breaker 5 are arranged at positions facing each other with the two main buses 1 and 2 interposed therebetween, and three-phase collective buses are connected to the main buses 1 and 2 and the branch buses 12 and 13. By applying this, the installation area can be greatly reduced. In addition, by arranging the circuit breakers 1 to 3 outside the main buses 1 and 2, the circuit breakers 1 to 3 can be inspected or removed during an accident, and the workability of restoration work is improved, and the work cost is reduced. Economically advantageous.

(3) Other Embodiments The above-described embodiments are presented as examples in this specification, and are not intended to limit the scope of the invention. In other words, the present invention can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof in the same manner as included in the scope and gist of the invention.

  For example, in the above embodiment, the two circuit breaker units arranged outside the first main bus bar or the second main bus bar are arranged adjacent to each other, but the present invention is not limited to this, and the units are arranged with an interval between the units. You may do it. Further, the units facing each other across the first main bus or the second main bus may be arranged such that the main axes of the units are not on the same axis but shifted. In these embodiments, although the installation area slightly increases, there is a merit that a space between units can be secured and work efficiency such as inspection work is improved.

DESCRIPTION OF SYMBOLS 1 ... 1st main bus-line 2 ... 2nd main bus-line 3 ... 1st circuit breaker 4 ... 2nd circuit breaker 5 ... 3rd circuit breaker 6 ... 1st disconnector 7 ... 2nd disconnector 8 ... 3rd disconnector 9 ... 4th disconnector 10 ... 5th disconnector 11 ... 6th disconnector 12 ... 1st branch bus 13 ... 2nd branch buses 14, 15 ... Connection bus 16 ... Detachment device 21 ... 1st circuit breaker unit 22 ... 2nd circuit breaker Unit 23 ... third circuit breaker unit

Claims (7)

3 having vertical first, second, and third circuit breakers electrically connected in series, and first to sixth disconnectors attached to both ends of the first, second, and third circuit breakers. With two breaker units,
A unit having the first circuit breaker, the first disconnector and the second disconnector is a first circuit breaker unit,
A unit having the second circuit breaker, the third disconnector and the fourth disconnector as a second circuit breaker unit;
A unit having the third circuit breaker, the fifth disconnector and the sixth disconnector is defined as a third circuit breaker unit,
A first main bus is connected to one end of the first circuit breaker via the first disconnector;
One end of the second circuit breaker is connected to the other end of the first circuit breaker via the second disconnector and the third disconnector,
The other end of the second circuit breaker is connected to one end of the third circuit breaker via the fourth disconnector and the fifth disconnector,
A second main bus is connected to the other end of the third circuit breaker via the sixth disconnector;
Branching a first branch bus and a second branch bus electrically connected between the first circuit breaker and the second circuit breaker and between the second circuit breaker and the third circuit breaker, respectively;
In the gas insulated switchgear in which an end device for external connection is connected to the end of the first branch bus and the second branch bus,
Arranging the first main bus bar and the second main bus bar in parallel at a predetermined interval;
Each circuit breaker unit is arranged so that the main axis of the unit is perpendicular to each main bus line,
The side opposite to the second main bus viewed from the first main bus is the outside of the first main bus,
The side opposite to the first main bus viewed from the second main bus is defined as the outside of the second main bus,
Arranging the first circuit breaker unit and the second circuit breaker unit outside the first main bus;
The gas insulated switchgear characterized in that the third circuit breaker unit is arranged outside the second main bus bar.   The gas insulated switchgear according to claim 1, wherein the main shaft of the second circuit breaker unit and the main shaft of the third circuit breaker unit are arranged on the same axis.   The gas insulated switchgear according to claim 2, wherein the first circuit breaker unit and the second circuit breaker unit are arranged adjacent to each other in the longitudinal direction of the first main bus bar and the second main bus bar. .   The gas insulated switchgear according to claim 1, wherein the main shaft of the first circuit breaker unit and the main shaft of the third circuit breaker unit are arranged on the same axis.   The gas insulated switchgear according to claim 4, wherein the second circuit breaker unit and the third circuit breaker unit are disposed adjacent to each other in the longitudinal direction of the first main bus bar and the second main bus bar. .   The gas insulated switchgear according to any one of claims 1 to 5, wherein the first main bus and the second main bus are formed of a three-phase collective gas insulated bus.   The gas insulated switchgear according to any one of claims 1 to 6, wherein the first branch bus and the second branch bus are three-phase collective gas insulated buses.

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