JPH07193926A - Gas insulated switchgear - Google Patents

Abstract

PURPOSE:To provide a gas insulated switchgear excellent in economy and the size thereof can be reduced while enhancing the workability in the maintenance/ inspection of the circuit breaker and the operating mechanism thereof. CONSTITUTION:Two bus side disconnectors 13, 14 are disposed between a pair of main buses 11, 12 and three circuit breakers 15-17 are disposed therebetween. Central disconnectors are disposed between respective circuit breakers and an operating mechanism for driving the circuit breaker is housed in a mechanism box for a three-phase circuit with the peripheral surface thereof being shifted from that of a mechanism box for other phase. This structure provides a sufficient space around the mechanism box thus facilitating the maintenance/ inspection of the operating mechanism. Furthermore, the phase spacing can be shortened significantly by arranging the instrument transformer and current transformer having large outer diameter while shifting for each phase.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phase-separated type gas-insulated switchgear in which a switching circuit is individually provided for each phase, and in particular, a gas-insulated switchgear with improved maintenance and inspection of circuit breakers. It relates to the device.

[0002]

2. Description of the Related Art Conventionally, a gas insulated switchgear of 1.1 / 2 CB type constituted by electrically connecting three circuit breakers in series has been known as a gas insulated switchgear of a system having an ultrahigh voltage or higher. Has been. A phase-separated gas insulated switchgear has been conventionally known as an example of such a gas insulated switchgear of 1.1 / 2 CB type. The phase-separated type gas-insulated switchgear is a device in which a busbar or the like is connected to a circuit breaker via a gas-insulated conductor including circuit means such as a disconnector, and a switchgear is provided individually for each phase.

A conventional example of such a gas-isolated switchgear of the phase-separated 1.1 / 2 CB system is Japanese Patent Publication No. 2-135.
25, JP 62-12309 A, JP 6
The device described in the 2-110408 gazette etc. is known.

The structure of the phase-separated 1.1 / 2CB type gas insulated switchgear disclosed in Japanese Patent Publication No. 2-13525 will be specifically described with reference to the plan view of FIG. That is, the pair of main buses 1a and 1b are provided in parallel in the vertical direction. Further, first to third circuit breakers (horizontal circuit breakers) 3a, 3b, 3c are arranged in parallel with respect to the main buses 1a, 1b in a direction (lateral direction) whose axes are perpendicular to each other. Disconnectors are provided at both ends of each of the circuit breakers 3a, 3b, 3c. In the lowermost first circuit breaker 3a and the uppermost third circuit breaker 3c, the busbar side disconnectors 2a and 2b are respectively provided at the ends on the main busbars 1a and 1b side and the central disconnector is provided at the other side. Devices 4a and 4d are provided. on the other hand,
The second circuit breaker 3b provided at the intermediate position is provided with central disconnectors 4b and 4d at both ends thereof. The central disconnectors 4b and 4d are 4c on the main bus side and 4d on the other side in the figure. A connecting bus bar is provided to connect such a disconnector. One of the connecting busbars 7a and 7b connecting the circuit breakers 3a and 3b or the circuit breakers 3b and 3c is arranged obliquely and connected to the opposite end.

Therefore, in order from the main bus 1a, the busbar side disconnector 2a, the first circuit breaker 3a, the central disconnector 4a, the connecting busbar 7a, the central disconnector 4b, the second circuit breaker 3b, the central disconnector 4c, the connection. The busbar 7b, the central disconnector 4d, the third circuit breaker 3c, the busbar-side disconnector 2b, and the main busbar 1b are electrically connected in series. In addition, the central disconnector 4a, 4
The disconnecting switches 5a and 5b for pulling out are provided between b and between the central disconnecting switches 4c and 4d, respectively. External drawing circuit bushings 6a and 6b are connected to the drawing disconnecting switches 5a and 5b, respectively.

This 1 1/2 CB type gas-insulated switchgear has a flexible system operation method and has been widely spread in recent years together with the double bus bar 4 bus tie type. Especially, double bus bar 4
In the bus tie method and the double bus 1 bus tie method, it is necessary to stop the line during maintenance / inspection of the circuit breaker, whereas in the 11 / 2CB method, the line is stopped even during maintenance / inspection of the circuit breaker. Since it can be operated without any operation, it is advantageous for systems where it is difficult to stop the line.

By the way, a gas-insulated switchgear is generally
Maintenance and inspection are required regularly and after opening and closing a predetermined number of times. This is done for the contact parts inside the container and the drive device inside the opening / closing mechanism box. Where 1
-With the 1 / 2CB type switchgear, it is possible to maintain and inspect adjacent circuit breakers while the drawer circuit is operating due to the line configuration.

However, the following problems have occurred in the above-mentioned 1/1 / 2CB type gas-insulated switchgear. That is, in the gas-insulated switchgear provided with the horizontal circuit breaker as shown in FIG. 11, when the contact parts of the circuit breaker 3c are to be maintained and inspected, the connecting bus bar 7b obliquely provided is used.
It becomes an obstacle and must be removed for maintenance and inspection. For this reason, it is necessary to stop the operation of the pull-out circuit 6b connected to the connecting bus bar 7b through the pull-out disconnecting switch 5b. Therefore, the special features of the 1.1 / 2CB type switchgear have not been utilized.

Therefore, in recent years, FIG. 12 and FIG.
1.1 / 2C with vertical breaker as shown in
A B type gas insulated switchgear is provided. 12 is a plan view and FIG. 13 is a side view. That is, the pair of main buses 11 and 12 are arranged in parallel in the horizontal direction. Between the main buses 11 and 12, first to third circuit breakers (vertical circuit breakers) 15 to 17 which are long in the vertical direction (longitudinal direction) are arranged in parallel, and electrically connected via a disconnector. It is connected. That is, the busbar side disconnector 1 is arranged in order from the main busbar 11.
3, first circuit breaker 15, central disconnector 18, second circuit breaker 1
6, central disconnector 19, third circuit breaker 17, bus-side disconnector 1
4, the main bus 12 is electrically connected in series via the connection bus. First and second circuit breakers 15, 1
The central disconnectors 18 and 19 provided between 6 and between the second and third circuit breakers 16 and 17 have two disconnections electrically connected in series in the container. From between the two disconnecting portions, the disconnecting disconnectors 20 and 21 are provided via branch busbars 28 and 29, and the external extracting circuit bushings 22 and 23 are connected thereto. Also, the first
The meter current transformers 25 to 27 are attached to the branch connection portions of the third circuit breakers 15 to 17, and the meter transformer 24 is connected to the upper portion of the branch busbar 28. Here, in the first to third circuit breakers 15 to 17, a mechanism box 40 is provided at a lower portion of each of the circuit breakers.

The devices shown in FIGS. 11 and 12 are made up of three phases and are arranged in parallel. Further, in the drawing, a, b, and c are given together with the reference numerals corresponding to the first to third three phases.

1 having the above-mentioned vertical circuit breaker
In the 1 / 2CB type gas insulated switchgear, a hydraulic operating mechanism using high pressure oil as a drive source and an electric spring operating mechanism using spring energy as a drive source are generally used as an operating mechanism section of a circuit breaker. There is. Regarding these, FIG. 14 to FIG.
This will be described with reference to FIG. 14 to 16 are similar to FIG.
3 is a yy cross-sectional view of a mechanism box provided under the first circuit breaker 15 of FIG. 3, FIG. 14 is a schematic diagram showing a configuration of a hydraulic operation mechanism, and FIG. 15 is a schematic diagram showing a configuration of an electric spring operation mechanism. 16 is an enlarged view of a main part of FIG.

In FIG. 14, a mechanism box 40 is provided under each phase breaker of the vertical breaker 15. The mechanism box 40 is provided with a hydraulic operating device that uses high-pressure oil as a drive source and individually drives the contacts of each phase. As this hydraulic pressure operating device, a hydraulic pressure operating cylinder 49 is housed at a position on the shaft center 31 of the shutoff portion. Further, a pressure accumulating device 50 for supplying high pressure oil to the hydraulic pressure operating cylinder 49, and a pressure increasing device unit 51 for accumulating the low pressure oil and increasing the pressure of the low pressure oil are housed. These are connected to the hydraulic operation cylinder 49 by a pipe (not shown). Such a three-phase breaker and mechanism box 40
Are arranged on a straight line parallel to the main buses 11 and 12.

Further, in the case of the electric spring operating mechanism of FIG. 15, the three-phase breaker and the mechanical box 40 of each phase thereunder are connected to the main busbars 11 and 12 as in the hydraulic operating mechanism of FIG. They are provided on a straight line that is parallel. In the mechanism box 40 of each phase, an electric spring operating mechanism 41 having a unit structure including a shutoff operating spring, a closing operating spring, a spring energy storage device and a link mechanism.
However, the position is shifted from the axial center 31 of the cutoff portion. The electric spring operating mechanism 41 is provided with a rotary drive shaft 42. The rotary drive shaft 42 projects toward the shaft center 31 of the cutoff portion and is mechanically connected to the cutoff portion by a link 43.

In such an electric spring operating mechanism, the entire operating mechanism 41 has a long shape. Therefore, in order to reduce the inter-phase distance L of each phase in the gas insulated switchgear, it is convenient to house the operating mechanism 41 in the longitudinal direction of the line (axial direction of the connecting busbar).

Such an operation mechanism 41 is attached to the mechanism box 40 as shown in FIG. That is, the operation mechanism 41 is provided with a plurality of bosses 47 protruding. On the other hand, in the mechanism box 41, the angle 48 is also sold. The angle 48 has an engaging hole 48a.
The boss 47 is inserted into and engaged with the engagement hole 48a, and the boss is fixed to the angle by the nut 46.

The mechanical box 40 of such a circuit breaker is
As shown in FIG. 16, the three phases are arranged in close contact with each other.

[0017]

However, the following problems have occurred in the conventional gas insulated switchgear of 1.1 / 2CB type. That is, in order to miniaturize the device, it is required to shorten the inter-phase dimension L of each of the three phases. Therefore, as shown in FIG. 16, the mechanism box 40 is arranged so that the three phases are in close contact with each other.
However, in this state, it is difficult to perform work such as inspection / maintenance, extraction / replacement, etc. from the side surface adjacent to the mechanism box 40 of the other phase, and this is a serious problem particularly in the second phase that is the middle phase. . For this reason, in the second phase, when performing work on the side surface adjacent portion adjacent to the first phase or the third phase,
A work space may be secured on the front surface or the rear surface of the mechanism box 40, and the front or rear covers 401 and 402 may be opened and closed to start the work from there.

However, in this case, a work space inside the mechanism box 40 is required in addition to a work space on the front surface or the back surface of the mechanism box 40, and as a result, the mechanism box 40 becomes large. Further, the mechanism box 40 is provided with a display panel 45 for displaying an open / close display, a counter, the pressure of SF6 gas, etc., but this must be provided and displayed at a position that is easier to see from the outside. However, in the arrangement of the mechanism box 40 according to the conventional technique, the mechanism box 40 is provided in the intermediate second phase front cover 401 portion.

Wirings and pipes are connected to the display panel 45, but these are not to be removed during maintenance and inspection of the operating mechanism 41. Therefore,
Since the operation mechanism 41 is provided on the opposite side to the center of the mechanism box 40, the mechanism box 40 becomes larger accordingly.

Further, in the conventional gas-insulated switchgear, the operation mechanism 41 is attached to the mechanism box 40 by the operation mechanism 41.
A plurality of bosses 47 of the mounting angle 4 in the mechanism box 40
It is carried out by inserting it into No. 8 and engaging it, and fixing it with a nut 46. In this case, in order to remove the operating mechanism 41, the boss 47 and the mounting angle 48 are temporarily disengaged, the operating mechanism is moved in the side direction P, and then moved in the front direction Q without being taken out of the mechanism box. It didn't happen. Therefore, the mechanism box 40 needs a space for taking out the operation mechanism 41 in the interphase direction.

Further, in the conventional gas-insulated switchgear provided with the vertical type circuit breakers 15 to 17, the current transformers 25 to 2 for meters are used.
7 and the instrument transformer 24 are arranged adjacent to and close to each other. The outside diameter dimension of these devices is large, and therefore this outside diameter affects the interphase dimension.

As described above, as the size of the mechanical box 40 increases, the distance L between the phases increases accordingly. In addition, the distance L between the phases may vary depending on other components with a large outer diameter.
Will increase. In this case, it is difficult to reduce the size of the operation mechanism unit for the above reasons, in contrast to the reduction in size of the interruption unit due to the recent advances in insulation and interruption techniques. For this reason, not only is the circuit breaker increased in size, but the entire gas-insulated switchgear is also increased in size, impairing economic efficiency.

Depending on the arrangement inside the mechanism box 40, it is difficult to work from the front side or the back side of the mechanism box 40, and it is necessary to remove the circuit breaker for the first phase or the third phase on both ends of the second phase. May be required. Mechanism box 4
Not only would it be troublesome if the circuit breaker was removed and installed for each maintenance and inspection work within 0
It takes time and is uneconomical.

The present invention has been proposed in order to solve the above-mentioned drawbacks, and its purpose is to improve workability such as maintenance and inspection of a circuit breaker and its operating mechanism, and it is economical and compact. An object is to provide a gas-insulated switchgear that can be downsized.

[0025]

In order to achieve the above object, in the invention described in claim 1, a pair of main busbars arranged in parallel with a predetermined interval, and a main busbar adjacent to the main busbars are provided. Two busbar-side disconnectors provided between the busbars, three circuit breakers provided between the busbar-side disconnectors, and two central disconnectors provided between the circuit breakers are electrically connected in series. And a line is provided, and an external withdrawal line is connected to an intermediate point of the two adjacent central disconnectors, and each line is composed of three phases, first, second and third. In the insulated switchgear, the three circuit breakers are provided in a direction orthogonal to the main busbar and are arranged in parallel, and the circuit breakers of the respective phases have an operating mechanism for driving the circuit breakers. Are provided respectively, the operation mechanism is provided in a mechanism box, and each phase of the shutoff unit is Wherein the peripheral surface of 構箱 is disposed at a position of the circumferential surface not facing the line direction of the mechanism box adjacent phases. In this case, the first-phase mechanism box and the third-phase mechanism box can be arranged in opposite directions with the second-phase mechanism box sandwiched therebetween.

Corresponding to the arrangement of the circuit breaker, the branch connection portion provided with the current transformer for the meter or the transformer for the meter or the external connection portion can be arranged in the same manner by shifting each phase. Further, the circuit breaker can be displaced not only in the line direction but also in the vertical direction.

In such a structure, the operating mechanism at the bottom of the circuit breaker is further provided so that its longitudinal direction coincides with the line direction, and this is provided inside the mechanism box having the cover on the peripheral surface. At least two covers of the peripheral surface of the mechanism are provided so as to be openable and closable, columns are provided in each part of the mechanism box, and the columns between the columns in the line direction are larger than the length of the operating mechanism in the line direction. It can also be configured to.

As the mechanism box, one having a single space inside is used, and the operation mechanism for each phase can be housed in the inside at once. In this case, the circuit breaker may be arranged on a straight line inclined by a predetermined angle with respect to the main bus.

[0029]

In the gas insulated switchgear of the present invention as described above,
Since the circuit breakers for each phase are arranged in a staggered manner, the mechanical boxes for each phase are also displaced. In particular, in the second-phase mechanism box, which is the middle phase, the surrounding space is sufficiently large, and therefore maintenance and inspection of the operation mechanism section are facilitated. Further, by arranging the current transformers for instruments and transformers for instruments having a large outer diameter with the respective phases shifted, the interphase distance can be greatly reduced.

The circuit breaker is not only shifted in the line direction,
Even when they are arranged vertically offset, as described above,
The mechanical box shifts vertically, making maintenance and inspection of the operating mechanism easier.

By providing the operating mechanism at the bottom of the circuit breaker so that its longitudinal direction coincides with the line direction, the interphase dimension can be reduced. Furthermore, by opening and closing at least one of the circumferential surfaces of the operating mechanism facing the longitudinal surface of the operating mechanism, the maintenance and inspection of the operating mechanism can be facilitated, and the operating mechanism can be taken out easily. It will be easy.

By constructing such a mechanism box so as to house the three-phase operation mechanism in a lump, there is no mechanism box wall surface in the interphase portion, and the inspection / maintenance workability of the operation mechanism in the interphase portion is improved. improves. Further, in this case, by disposing the circuit breaker on a straight line inclined by a predetermined angle with respect to the main bus, inspection / maintenance workability is facilitated and the interphase distance can be reduced.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the gas-insulated switchgear of the present invention will be described below with reference to the drawings. The members having the same functions as those of the conventional technique are designated by the same reference numerals.

(1) First Embodiment FIG. 1 to FIG. 2 FIG. 1 is a plan view showing the structure of this embodiment, and FIG. 2 is a side view of FIG. In this embodiment, as shown in FIGS. 1 and 2, the pair of main buses 11 and 12 are provided in the horizontal direction and are arranged in parallel at a predetermined interval. Both main buses 1
Two busbar side disconnectors 13 and 14 are arranged between 1 and 12. Then, the two busbar-side disconnectors 13, 1
Vertically (longitudinal direction) elongated first to third circuit breakers (vertical circuit breakers) 15 to 17 are arranged in parallel with each other. Central disconnectors 18 and 1 are provided between the circuit breakers 15 to 17, respectively.
9 is provided. Also, the first and third circuit breakers 15, 1
7 is provided with an outlet on the side of the second circuit breaker 16 and on the side of the second circuit breaker 16 on the side of the first and second circuit breakers 15 and 17, and the current transformers 25, 26 and 27 are provided respectively. Is provided. And these are electrically connected in series.

Also, two adjacent central disconnectors 18, 1
A pull-out connection bus bar 28 is pulled out to an intermediate point of 9 and is connected to an external pull-out circuit via pull-out disconnecting switches 20 and 21. Bushings 22.23 are provided at the ends of the lead-out circuits.
In addition, on the upper part of the straight line type disconnector 18, a transformer for instrument 24
Is provided.

Such a connection is made from the main bus 11 in order.
L-type busbar side disconnector 13, first circuit breaker 15, current transformer 25,
Linear central disconnector 18, current transformer 26, second circuit breaker 16,
Current transformer 26, straight central disconnector 19, current transformer 27, third
The circuit breaker 17, the L-shaped busbar-side disconnector 14, and the main busbar 12 are electrically connected in series via a connection busbar. These constituent members are composed of first to third phases, respectively, and are connected by a connecting bus bar for each phase.

Here, the circuit breakers 15 to 17 are provided with a mechanism box 40 in the lower part thereof, and an operation mechanism for driving the opening and closing of the circuit breakers is housed therein. Such a circuit breaker 1
5 to 17 are arranged so that their positions are shifted for each phase.
That is, for the second-phase circuit breakers 15b, 16b, 17b, the first-phase circuit breakers 15a, 16a, 17a and the third-phase circuit breakers 15c, 16c, 17c are mechanism boxes provided with operating mechanisms. They are arranged so as to be displaced in the line direction (axial direction of the connecting bus bar) by the axial width W of the connecting bus bar of 40.
Further, the first phase and the third phase are evenly arranged in opposite directions with the second phase interposed therebetween.

In addition to the circuit breaker being displaced, the other constituent members are also displaced in the following manner. This means that, for example, for the first phase and the third phase, the same configuration of the second phase is parallel to the second phase.
Moreover, the current transformers 25 to 27 are arranged so as to be displaced in the axial direction of the connecting busbars by a dimension that does not interfere with each other.

Operation of the present embodiment configured as described above
The effect is as follows. That is, in this embodiment, the first
-The phases of the third circuit breakers 15-17 are arranged in a staggered manner, and the mechanical boxes 40a, 40b of the respective phases of the circuit breakers 15-17 are arranged.
Similarly, 40c is also displaced. this is,
Since the mechanical boxes 40 are arranged so as to be offset from each other by the axial width W of the connecting busbar, each of the mechanical boxes 40 of the first to third phases has four units.
This means that the peripheral surface is not in contact with the peripheral surface of the mechanical box 40 of another phase.

Therefore, in the prior art, the work such as the maintenance and inspection of the inside of the mechanical box 40 is performed in the first phase and the third phase.
In the second phase in the direction and the middle, it was possible only from two directions due to the peripheral surface of the other phase.
Inspection is possible from any direction on the surface. As a result, even when the operation mechanism of the circuit breakers 15 to 17 has a defect, or when the operation mechanism is removed for regular inspection or the like, the operation of removing the circuit breaker on the upper part of the operation mechanism is not required, and the mechanism box can be easily installed. It can be removed from 40. Therefore, the mechanism box 40 can be downsized, and
Conventionally, the gap between the mechanism boxes 40 of the respective phases is not necessary, so that the dimension between the first phase to the third phase can be reduced.

Moreover, in this embodiment, the circuit breakers 15 to 17 are
Not only each phase, but also the current transformers 25 to 27 having a large outer diameter and the instrument transformer 24 are arranged so as to be displaced by a dimension not interfering with each phase, so that the first to third phases It is possible to significantly reduce the inter-phase dimension of each. This also makes it possible to reduce the size of the gas-insulated switchgear as a whole.

(2) Second Embodiment FIG. 3 to FIG. 4 In the present invention, the positions can be arranged as follows for each phase of the circuit breakers 15 to 17 of the above embodiment.

That is, the first-phase circuit breakers 15a, 16
a, 17a and third-phase circuit breakers 15c, 16c, 17c
Are arranged in the same direction in the line direction (axial direction of the connecting busbar) by the axial width W1 of the connecting busbar of the mechanism box 40 provided with the operating mechanism.

With this structure, the same effect as that of the first embodiment can be obtained. Moreover, the width in the line direction can be reduced as compared with the first embodiment, and the overall size of the gas insulated switchgear can be further reduced.

(3) Third Embodiment FIG. 5 to FIG. 6 In the present invention, the gas insulated switchgear can be configured as follows. That is, as shown in FIGS. 5 to 6, the main buses 11 and 12 are provided in the horizontal direction and are arranged in parallel at a predetermined interval. And both main buses 11, 1
The two phases are arranged in parallel in the vertical direction. Between the two main buses 11 and 12, the first elongated vertically (longitudinal direction)
-The 3rd circuit breaker (vertical type circuit breaker) 15-17 is arranged in parallel, and is electrically connected via a disconnecting switch. That is, in order from the main bus line 11, the T-type disconnector 13, the first circuit breaker 15, the current transformer 25, the straight line disconnector 18, the current transformer 26, the second circuit breaker 16, the current transformer 26, the straight line disconnector. Switch 19, Current transformer 27, Third circuit breaker 15, T-type disconnector 14, Main bus 12a
Are electrically connected in series via a connecting bus bar.

Further, linear disconnectors 18 and 19 are provided between the first and second breakers 15 and 16 and between the second and third breakers 16 and 17, respectively. These linear disconnectors 18, 19 include pull-out disconnectors 20, 21.
A drawing circuit to the outside is connected via. It should be noted that all of these constituent members are composed of first to third phases, and are connected by a connecting bus bar for each phase.

Further, as shown in FIG. 6, circuit breakers 15-1
The height of 7 differs for each phase, and from the bottom, the third-phase circuit breakers 15c, 16c, 17c and the second-phase circuit breakers 15b, 16
b, 17b, and the first-phase circuit breakers 15a, 16a, 1
It becomes high in order of 7a. Second-phase circuit breaker 15b, 1
6b and 17b are circuit breakers 15c, 16c and 17 of the third phase.
It is arranged higher than c by the height H of the mechanism box 40. Further, the first-phase circuit breakers 15a, 16a, 17a are
The height H of the mechanism box 40 is higher than the second-phase circuit breakers 15b, 16b, and 17b.

Furthermore, these first to third circuit breakers 15 to
The component equipment connected to 17 and the connecting bus bar connecting the two are arranged at the same height as the breaker of the corresponding phase. Further, in each component, the first phase to the third phase are arranged so as to be different from each other by the height H of the mechanism box as in the case of the circuit breaker.

Operation of the present embodiment configured as described above
The effect is as follows. That is, in this embodiment, the first
The phases of the third circuit breaker and the other constituent members are provided so as to differ by the height H of the mechanism box. For this reason, the heights of the mechanism boxes 40 of the first to third circuit breakers are also arranged at positions different by that height. Therefore, when performing work such as maintenance / inspection in the mechanism box 40, it is possible to perform each phase from four directions. This includes first-phase and second-phase circuit breakers 15a, 16a, 17a, 15b,
In the case of 16b and 17b, it is the front surface, the back surface, the bottom surface, and one side surface, and in the case of the third-phase circuit breakers 15c, 16c, and 17c, the front surface, the back surface, and the side surface of both methods. This facilitates maintenance and inspection work. Furthermore, the circuit breaker 15-
Even if a malfunction occurs in the operation mechanism of 17, the operation mechanism can be easily removed without removing the circuit breakers 15 to 17 from the device, and the work can be facilitated.

In addition, the mechanism box 40 can be downsized, and since the gap between the mechanism boxes 40 of the respective phases is no longer required, the dimension between the first phase to the third phase can be reduced. it can.

(4) Fourth Embodiment FIG. 7 In the first embodiment, the mechanism box 40 in which each phase is displaced in the line direction (the axial direction of the connecting busbar) is configured as follows. be able to. That is, as shown in FIG. 7, columns 46 are provided at the four corners of each phase of the mechanism box 40. The dimension W1 between the columns 46 in the line direction is
It is configured to be slightly longer than the length L of the operating mechanism 41. The operation mechanism 41 is provided in the direction of the side surface cover 403 on one side (the left-hand side when viewed from the front in the figure) of the peripheral surface parallel to the line direction inside the mechanism box 40.

Further, in the present embodiment, a display panel 45 for opening / closing display, gas pressure, etc. is provided inside the mechanism box 40. This is provided in the direction of the side cover 404 facing the operation mechanism 41 (on the right hand side when viewed from the front in the figure). The display panel 4 is attached to the side cover 404.
A display window 404 for viewing 5 is provided. The display window 404 is configured to be openable / closable so that the display panel 45 can be operated and work can be performed.

Operation of the present embodiment configured as described above
The effect is as follows. That is, when the operation mechanism 41 is taken out of the mechanism box 40 due to a malfunction of the operation mechanism 41, the side cover 403 is opened. At this time, the operation mechanism 41 can be pulled out linearly in the direction of the side cover 403. Therefore, the operating mechanism 4
When attaching and detaching 1, the operation is greatly simplified as compared with the conventional movement while adjusting in two directions, and the operation time can be shortened and the reliability of the device can be improved.

Further, since the display panel 45 can be provided on the side of the mechanism box 40, the width W2 of the mechanism box 40 when viewed from the front can be greatly reduced. Accordingly, if the arc extinguishing chambers (not shown) of the circuit breakers 15 to 17 are formed to be sufficiently small, the interphase dimension can be significantly reduced. As a result, the gas insulated switchgear can be downsized.

The display panel 45 is not limited to being provided on the side surface side, but may be provided on the front surface side or the rear surface side depending on the installation location of the device. This facilitates confirmation of display or work.

(5) Fifth Embodiment FIG. 8 to FIG. 9 In the present invention, the gas insulated switchgear can be configured as follows. That is, as shown in FIG. 8, in each of the three-phase first to third circuit breakers, the circuit breaker 30 is provided for each phase, and two circuit breakers provided so as to face the circumferential surface of the circuit breaker 30. A branch connecting portion 33 that is directly connected to each disconnector is provided. Then, the first to third phase blocking portions 30 are arranged on a straight line inclined by a predetermined angle θ with respect to the axis 32 of the main bus arranged parallel to the horizontal direction. Further, the branch connection portion 33 is provided in parallel with the axis 32 of the main bus.

On the other hand, as shown in FIG. 9, each of the three-phase breaking portions 30 arranged as described above is provided with a hydraulic operating mechanism at the bottom as an operating mechanism for individually driving the breaking portion. There is. The three-phase operation mechanism 41 is collectively housed in one mechanism box 40. This mechanism box is arranged to be inclined by a predetermined angle θ with respect to the axis 32 of the main busbar, as in the case of the first to third phase breakers 30. In such a mechanism box 40, three hydraulic cylinders for respectively driving the three-phase breaker contacts are provided, and are arranged corresponding to the shaft centers 31 of the respective phase breakers. Further, in the mechanism box 40, a pressure accumulator 50 that supplies high-pressure oil to the three-phase hydraulic cylinder 49, and a booster unit 51 that stores low-pressure oil and pressurizes the low-pressure oil are housed. And
These are connected to the three hydraulic cylinders 49 by pipes (not shown).

In the present embodiment configured as described above, in each of the three-phase circuit breakers, the circuit breaker 30 is arranged at an angle θ with respect to the axis 32 of the main busbar. The interphase distance can be reduced. Along with this, the operation mechanism of each shutoff portion is provided in one mechanism box 40, and since it is arranged at a predetermined angle θ with respect to the axis 32 of the main busbar, the length in the longitudinal direction thereof is increased. The size is significantly larger than the interphase distance L. Therefore, a large work space can be taken, and the work is facilitated when performing work such as maintenance and inspection of the operation mechanism 41.

(6) Sixth Embodiment FIG. 10 In the fifth embodiment, the hydraulic operation mechanism is shown as the operation mechanism, but in the present invention, an electric spring operation mechanism may be used.

That is, as shown in FIG. 10, as in the case of the hydraulic operation mechanism, three electric spring operation mechanisms 41 for respectively driving the three-phase breaker contacts are housed in one mechanism box 40. To do. The electric spring operation mechanism 41 is configured by a shutoff operation spring, a closing operation spring, a spring energy storage device, and a link mechanism as a unit. Such an electric spring operating mechanism 41 is arranged parallel to each other by shifting in a certain direction from the shaft center 31 of the interrupting portion corresponding to each of the three phases.
Further, the rotary drive shaft 42 of the electric spring operating mechanism 41 is provided so as to project in the direction of the shaft center 31 of the breaking portion of each phase, and is mechanically connected to the breaking portion of each phase by each link mechanism 43. This embodiment as described above can also obtain the same effect as that of the fifth embodiment.

The present invention is not limited to the above-described embodiments, and those skilled in the art can think of other various embodiments in the same manner, and all of them are within the scope of the present invention. It is included.

[0062]

According to the gas insulated switchgear of the present invention, the workability such as maintenance and inspection of the circuit breaker and its operating mechanism is improved, the cost is good, and the gas insulated switchgear can be downsized and downsized. Can be provided.

In particular, when the positions of the circuit breakers of the respective phases are displaced from each other, the mechanical boxes of the respective phases are also displaced. In particular, in the second-phase mechanism box, which is the middle phase, the surrounding space is sufficiently large, and therefore maintenance and inspection of the operation mechanism section are facilitated. In addition, the current transformer for instruments and the transformer for instruments having a large outer diameter are also arranged with the phases shifted, so that the inter-phase distance can be greatly reduced.

Further, by providing the operation mechanism at the bottom of the circuit breaker so that its longitudinal direction coincides with the line direction,
The interphase dimension can be reduced. Further, by providing at least one of the peripheral surfaces facing the longitudinal surface of the operating mechanism in the mechanism box in which it can be opened and closed, the operation and maintenance of the operating mechanism can be facilitated and the operation mechanism can be taken out easily. It will be easy.

By constructing such a mechanism box so as to house the three-phase operation mechanism in a lump, there is no mechanism box wall surface in the interphase portion, and the inspection / maintenance workability of the operation mechanism in the interphase portion is improved. improves. Further, in this case, when the circuit breaker is arranged on a straight line inclined by a predetermined angle with respect to the main bus, the inspection / maintenance workability is facilitated and the interphase distance can be shortened.

[Brief description of drawings]

FIG. 1 is a plan view showing a first embodiment of a gas insulated switchgear according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a plan view showing a second embodiment.

FIG. 4 is a side view of FIG.

FIG. 5 is a plan view showing a third embodiment.

6 is a side view of FIG.

FIG. 7 is a cross-sectional view of an essential part showing a fourth embodiment.

FIG. 8 is a plan view of an essential part showing a fifth embodiment.

9 is a cross-sectional view of the main parts of FIG.

FIG. 10 is a cross-sectional view of essential parts showing a sixth embodiment.

FIG. 11 is a plan view showing a gas-insulated switchgear using a conventional horizontal breaker.

FIG. 12 is a plan view showing a gas insulated switchgear using a conventional vertical circuit breaker.

FIG. 13 is a side view of FIG.

14 is a cross-sectional view of an essential part showing an operating mechanism of a circuit breaker using the hydraulic operating mechanism in FIG.

FIG. 15 is a cross-sectional view of an essential part showing an operating mechanism of a circuit breaker using an electric spring operating mechanism in FIG.

16 is an enlarged view of a main part of FIG.

FIG. 17 is a perspective view of an essential part of FIG.

[Explanation of symbols]

 1, 11, 12 ... Main busbars 2, 13, 14 ... Busbar-side disconnectors 3, 15-17 ... Circuit breakers 4, 18, 19 ... Central disconnectors 5, 20, 21 ... External drawer disconnectors 6, 22, 23 ... External drawing circuit bushing 7 ... Connection bus 24 ... Instrument transformer 25-27 ... Instrument current transformer 28 ... Branch bus 30 ... Breaker 31, 32 ... Shaft center 33 ... Branch connection 40 ... Mechanism box 41 ... Operation mechanism 42 ... Rotation drive shaft 45 ... Display panel 46 ... Nut 47 ... Boss 48 ... Angle 49 ... Hydraulic operation cylinder 50 ... Accumulator 51 ... Booster unit

(72) Inventor Hideo Nagatomo 2-1, Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Stock Company Toshiba Hamakawasaki Plant (72) Inventor Mitsuru Toyota 2-1-1, Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Inside the Toshiba Hamakawasaki Factory (72) Inventor Isao Hioki 2-1, Ukishimacho, Kawasaki-ku, Kawasaki-shi, Kanagawa Stock Company Inside the Hamakawasaki Factory

Claims (7)

[Claims] 1. A pair of main busbars arranged in parallel at a predetermined interval, and 2 provided between the main busbars adjacent to the main busbars.
Of the busbar side disconnectors, three circuit breakers provided between the busbar side disconnectors, and two central disconnectors provided between the circuit breakers are electrically connected in series to provide a line. A gas-insulated switchgear in which an external lead line is connected to an intermediate point between the two adjacent central disconnectors, and each line is composed of first, second, and third phases, The three circuit breakers are arranged in parallel in a direction perpendicular to the axis of the main bus and are arranged in parallel, and the circuit breakers of the respective phases are respectively provided with operation mechanisms for driving the circuit breakers. The operating mechanism is provided in the mechanism box, and each phase of the circuit breaker is arranged at a position in the line direction in which the peripheral surface of the mechanism box does not face the peripheral surface of the mechanism box of the adjacent phase. Gas insulated switchgear. 2. The gas-insulated switchgear according to claim 1, wherein the first-phase mechanism box and the third-phase mechanism box are arranged in directions opposite to each other with the second-phase mechanism box interposed therebetween. 3. The circuit breaker is provided with branch connection parts in two directions respectively orthogonal to the main bus, and an external connection part for drawing out an external lead line is provided between each of the two central disconnectors. The branch connection unit or the external connection unit is provided with a current transformer for a meter or a transformer for a meter, and the branch connection unit or the external connection unit is a current transformer for a meter or a transformer for a meter. Is arranged at a position in the line direction corresponding to the arrangement position of each phase of the circuit breaker so that the peripheral surface of the circuit breaker does not face the peripheral surface of the current transformer for the meter of the adjacent phase. The gas-insulated switchgear according to claim 1 or 2. 4. A pair of main busbars arranged in parallel at a predetermined interval, and two provided between the main busbars adjacent to the main busbars.
Of the busbar side disconnectors, three circuit breakers provided between the busbar side disconnectors, and two central disconnectors provided between the circuit breakers are electrically connected in series to provide a line. A gas-insulated switchgear in which an external lead line is connected to an intermediate point between the two adjacent central disconnectors, and each line is composed of first, second, and third phases, The three circuit breakers are arranged in parallel in a direction perpendicular to the axis of the main bus and are arranged in parallel, and the circuit breakers of the respective phases are respectively provided with operation mechanisms for driving the circuit breakers. The operation mechanism is provided in a mechanism box, the three circuit breakers are arranged in parallel in the vertical direction, each circuit breaker is arranged in parallel, each phase of the circuit breaker, the peripheral surface of the mechanism box The first phase and the third phase are arranged in a vertical position that does not face the peripheral surface of the mechanism box of the adjacent phase. Mechanism box, a gas insulated switchgear, characterized by being arranged in opposite directions across the mechanism box of the second phase. 5. An operating mechanism, which can be independently operated for each phase, is provided in a lower portion of the circuit breaker so that a longitudinal direction thereof coincides with a line direction, and the operating mechanism has a cover on a peripheral surface. Provided inside the box, at least two covers of the peripheral surface of the mechanism box are openable and closable, columns are provided in each part of the mechanism box, and columns between the columns in the line direction are in the line direction of the operating mechanism. The gas-insulated switchgear according to claim 1, 2 or 4, wherein the gas-insulated switchgear is provided larger than the length. 6. The mechanism box according to claim 1, wherein the inside of the mechanism box is formed of one space, and the operation mechanism of each phase is collectively stored in the mechanism box. Item 4. A gas insulated switchgear according to item 4. 7. The gas insulated switchgear according to claim 6, wherein the three-phase circuit breaker is arranged on a straight line inclined by a predetermined angle with respect to the main bus.