JPH0245407B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a gas insulated switchgear in which the arrangement of equipment constituting a substation is improved.

[Technical background of the invention and its problems]

Electrical stations being constructed these days utilize the insulating and arc-extinguishing properties of SF ₆ gas to provide busbars, disconnectors,
There are many gas-insulated switchgears that are integrated and reduced in size by combining a disconnector, a grounding device, etc. The feature of this gas-insulated switchgear is that by changing the combination of busbars, disconnectors, cable disconnectors, etc., it is possible to adopt equipment configurations that are compatible with various wiring methods, and furthermore, the line lead-in is possible. In the case of overhead power transmission lines, there are suitable methods such as aerial bushing and in the case of underground power transmission lines, cable head junction boxes are used, and the methods for connecting to transformers include cables and direct connection. .

For example, when constructing a double bus type substation with gas-insulated switchgear as shown in the single line diagram in Figure 1, which has a first bus line 1 and a second bus line 2, the first bus line 1 and second bus line 2 are On one side of the system, each component assembly of the overhead power transmission line connection unit 3 of multiple systems is arranged, and on the other side, each component assembly of the multiple system transformer connection unit 4 is arranged. . That is, one outlet of the cable disconnector 5 of the transmission line connection unit 3 is connected to the first bus 1 and the second bus 2 via the bus-side current transformer 6, branch bus 7, and each bus-side disconnect switch 8, 9, respectively. The other outlet is connected to a gas-insulated conduit bus 14 via a line-side current transformer 10, a line-side disconnector 11, an earthing switch 12, and a cable connection box 13. These devices are interconnected to form a device assembly. Similarly, transformer connection unit 4
One outlet of the Noshiya disconnector 15 is also connected to the bus side current transformer 1.
6. Branch busbar 17 and busbar side disconnectors 18, 19
The other outlet is also connected to the gas-insulated conduit bus 23 via a track-side current transformer 20, a grounding switch 21, and a cable connection box 22.

The overhead power transmission line connection unit 3 and the transformer connection unit 4, the disconnectors 5, 15, the disconnectors 8,
The devices 9, 18, 19, etc. are each assembled into a sealed container to form a single device, and by connecting these devices, they are arranged as a connected device. That is, as shown in Japanese Patent Publication No. 53-42100 and Japanese Patent Application Laid-open No. 55-32500, for example, a disconnector is connected to a shingle breaker with the container of the shingle breaker held horizontally and on an extension of its axis;
Devices such as branch busbars are connected in a series of linear arrangements, and these connected devices are arranged in a position that is offset below the axis of the connected device and approximately perpendicular to the main busbar. Each line is arranged in parallel at predetermined equal intervals around the center.

Among these power protection devices, breakers are inspected taking into account the number of fault current breaks during power transmission circuit failures, the number of load current breaks during normal operation, and the period of commercial operation. . In many cases, compatibility is required in order to replace the main body of the disconnector in the event of a failure. Equipment such as disconnectors and branch busbars are connected to the above-mentioned disconnectors and disconnectors in a series of linear arrangements, and these linear equipment connections are arranged parallel to the left and right around the main busbar for each line. The workability of inspecting the breaker and replacing the main unit is very poor.

In other words, when performing inspection work on the shield section of a shield disconnector, since both ends of the shield disconnector are connected to other equipment, an appropriate manhole should be installed on the side of the shield disconnector container. It is necessary to make it easy to inspect the inside. In addition, when carrying out a detailed inspection of the sheath section, including replacing some parts, it is necessary to pull out the sheath section outside. In this procedure, a worker enters the shinobi cutter container through the manhole hole, disassembles the shaya cutter to a size that can be taken out from the manhole diameter, takes it outside, and then returns it to the container after completing the inspection. The broken part will need to be reassembled. In order to carry out this series of operations efficiently inside the disconnection container, the diameter of the manhole must be made larger.
In addition, it is necessary to increase the diameter of the cutter container. However, increasing the diameter of the manhole and the shield vessel results in an increase in the manufacturing cost of the shield vessel. Disassembly and reassembly of the sheath cutter, which has a complicated configuration, within a container with a limited diameter originally causes incorrect work and impairs the reliability of the sheath cutter itself.

Furthermore, when considering the work of replacing a breaker, in order to remove a breaker from a series of linearly arranged connected equipment, the connection between the breaker and the equipment connected to it must be removed, and the connection A gap is created in a part of the equipment group connected in series using a flexible bus bar built into the equipment group, and this gap is used to shift the main bus breaker body laterally, and then the main bus bar is moved. This involves a process of pulling out and moving it in the axial direction on the opposite side where it is placed. Further, in the above-mentioned Japanese Patent Publication No. 53-42100 and Japanese Patent Application Laid-Open No. 55-32500, the main bus bar is placed at the bottom, and above it is a group of connecting equipment such as a disconnector, a disconnector, a branch bus bar, etc. are arranged in a series of straight lines. This is because the height of the axis of the breaker container is relatively high as it is placed above the main bus bar, so in order to safely replace the breaker body, it is necessary to A method is required, such as making the parts divisible and removing them, and lowering the center of gravity of the container to move it. As described above, in the conventional arrangement, a large amount of time and effort is required to replace the shroud breaker main body.

[Purpose of the invention]

An object of the present invention is to provide a gas-insulated switchgear that facilitates the inspection work and replacement work of the shield breaker, and greatly reduces the time and labor required to perform the work. It is in.

[Summary of the invention]

In the gas insulated switchgear of the present invention, the bow breaker is arranged horizontally, and the connecting portions with other equipment provided at both ends thereof are configured in a U-shape when viewed from above. Other equipment and branch lines connected to the breaker are in a straight line across the breaker and the axis thereof is parallel to the axis of the breaker at a certain distance, and the U-shape of the breaker is parallel to the axis of the breaker. The device is characterized in that the shape is arranged so that it is displaced upside down on the left and right sides.

[Embodiments of the invention]

The present invention will be described below with reference to an embodiment shown in FIGS. 2 and 3. 2 and 3 show the arrangement of each device of the gas insulated switchgear shown in the single line diagram of FIG. 1, and the same parts are given the same reference numerals. That is, the first bus line 1 and the second bus line 2 are the three phase bus lines 1A, 1B, 1C and 2A, 2B, 2 at a height H ₁ from the foundation 50.
C is installed to form a double busbar system. These phase bus lines 1A, 1B, 1C and 2A, 2B, 2
C is constructed by installing a bus conductor in a gas-tight conduit container as is well known. Each device of the overhead power transmission line connection circuit unit 3 is arranged on the side of the first bus 1A, 1B, 1C as described later, and each of the transformer connection circuit unit 4 is arranged on the side of the second bus 2A, 2B, 2C. The equipment is arranged as described below. The equipment that makes up both units 3 and 4 has almost the same configuration for each phase, so for convenience, we will explain the C phase as an example, and the same symbols for other phases will be appended with A, B, and C. distinguish.

Again in FIGS. 2 and 3, the cable breaker 5C of the power transmission line connection unit 3 is set so that its axis is horizontal with respect to the foundation 50, and is connected to other equipment on the sides of both ends. connection outlet 51
C and 52C are drawn out so that they form a U-shape when viewed from above, and the exit direction is set at 90° to the exit portions 51C and 52C.
Curved branch busbars 52C and 53C for changing degrees
has been established. In other words, the breaker 5C is the foundation 5
0, its outlets 51C and 52C are led out parallel to the foundation 50 and perpendicular to the axis of the shingle cutter 5C, and further bent and branched generatrixes 52C and 53C.
The axis is rotated 90 degrees to match the axial direction.

A curved branch bus 52C of one outlet 51C of the breaker 5C is connected to a bus-side current transformer 6C and a straight branch bus 7C, and from this branch bus 7C to the bus 1C via a bus-side disconnector 8C. It is also connected to the bus bar 2C via the bus bar side disconnector 9C. The curved branch busbar 53C of the other outlet 52C of the disconnector 5C is connected to the line-side current transformer 10C and the line-side disconnector 1.
1C and a grounding switch 12C to a cable termination box 13C, from which a gas insulated conduit 14
Connected to C.

Similarly, transformer connection unit 4 disconnector 15C
is arranged horizontally with respect to the foundation 50, and exits 51C and 52C are drawn out on the side surfaces of both ends so as to form an inverted U shape when viewed from above, and the exits 51C and 5
A curved branch bus line 53C that changes direction 90 degrees to 2C,
54C is connected. The one curved branch bus 54C is connected to the bus-side current transformer 16C and the branch bus 17C, and is further connected to the bus-side disconnector 1
8C to the busbar 1C, and the busbar side disconnector 19
It is connected to bus bar 2C via C. The other outlet 52C of the disconnector 15C is connected to the line side current transformer 20.
C, earthing switch 21C and cable termination box 22
C, and from there to the gas insulated conduit 23C.

In both the power transmission line connection unit 3 and the transformer connection unit 4, the equipment configurations of the other phases A and B are arranged in the same manner as the C phase. In addition, not only one line but also a required number of lines are branched from bus lines 1 and 2 if necessary. In Fig. 2, if we look at the arrangement of equipment between each phase, we can see that breakers 5A, 5B,
Derived the outlet of 5C as a U-shape, and cut it out
By deriving the outlets of A, 15B, and 15C into an inverted U shape, two axes now exist in the equipment connector of each phase. That is, each sheath disconnector 5A, 5B, 5C and 15A, 15B, 15C
The first axis L ₁ -L ₁ is the second axis L ₂ -L ₂ of the connected body of other equipment other than these cutters. Now, if the device connections of each phase A, B, and C are arranged in parallel and equally spaced with a spacing l+l, the axes of the sheath breakers 5A, 5B, and 5C are aligned with the spacing l. The dimensions of the outlet of each phase and disconnector 5A, 5B, 5C will be controlled.
will be installed exactly in the middle of each phase equipment interval l+l. This interval l+l is the distance between each phase and the disconnector 5A,
The spacing is convenient for carrying out work on 5B and 5C, or for pulling out the disconnector for replacement. Moreover, the distance l+l between adjacent equipment connectors is a necessary dimension even when the breaker is arranged in a straight line with other equipment.
In the present invention, the sheath breaker is arranged horizontally in the space that was previously wasted, and the space is used to inspect and replace the sheath breaker.

Furthermore, looking at the mutual equipment connection between the overhead power transmission line connection unit 3 and the transformer connection unit 4, it is found that the openings of the unit 3 and the disconnectors 5A, 5B, and 5C have a U-shaped configuration, whereas the unit 3 has a U-shaped opening. 4 noshiya disconnector 1
Since the openings 5A, 15B, and 15C have a U-shaped configuration, the following convenient arrangement relationship can be achieved. In other words, the equipment can be arranged so that the axes _L1' - _L1' of the sheath breakers 15A, 15B, and 15C of the unit 4 coincide with the extension of the axis _L2 - _L2 of the equipment connection body of the unit 3. , it becomes possible to pull out the breaker as shown by arrow F. In addition, the power transmission line unit 3 is
The extent Y of the planar space on the side and the extent Z of the planar space of the equipment on the transformer connection unit 4 side are as follows:
They have approximately the same width, which is approximately equal to the spread width of a conventional equipment arrangement. In addition, the overall width W2 of the power line connection unit 3 and the transformer connection unit perpendicular to the main busbar arrangement direction is larger than that of the case where the outlet of the break breaker is led out to the end in the longitudinal direction. can be shortened by the difference in length of the U-shaped outlet lead-out portion. As a result, it is possible to reduce the space required for the entire gas insulated switchgear, and the total site space of the electrical station can be further reduced.

In the equipment arrangement of the gas insulated switchgear according to the present invention shown in FIGS. 2 and 3, the cable disconnectors 5A, 5B, 5C of the power transmission line connection unit 3 and the cable disconnectors 15A, 15B of the transformer connection unit 4 are installed. , 15C, whose axes _L1 - _L1 and _L1' - _L1 ' are horizontal and on the same plane, and which are shifted upward from this plane to form main generatrixes 1A, 1B, 1C and 2A, 2B, 2C are arranged parallel to each other on the same plane, and their main busbars are connected to busbar disconnectors 8, 9, 17, 1 of the corresponding phases.
Supported by 9. By placing the equipment below the main bus, the
The shaft center height h ₂ of No. 5 has a low center of gravity, which makes it convenient for attaching and detaching when replacing the sheath cutter.

For example, in order to inspect the shatter breaker 5A, if the cover plate G on at least one side of the shatter breaker container is configured to be openable and closable, the lid plate G can be opened during inspection and the shatter cutter can be inspected. It is possible to make it easily visible. This is the outlet of the shiya disconnector.
This is possible because the space facing the cover plate G has a margin of 1+1 in the letter-shaped configuration. In addition, when pulling out the disconnector, if the connections between the outlets 51C and 52C and the curved branch busbars 52C and 53C are released, the gap l+
This is done by moving the sheath cutter in the direction of arrow F using the arrow F. This can also be realized by making the outlet of the disconnector U-shaped and by providing a space of l+l between each phase.

In addition, in the embodiment shown in FIGS. 2 and 3,
Although the configuration is a double bus system, the equipment can be arranged in the same way even if a single bus system is adopted, and the same arrangement can be performed even when the main bus is configured as a three-phase collective bus.

〔Effect of the invention〕

As described above, in the present invention, among the device combinations such as the bridge disconnector, disconnector, current transformer, and branch bus that are branch-connected to the main bus, the devices other than the bridge disconnector are placed on the same axis. By connecting and placing the shield breaker horizontally on an axis displaced from the axis of the equipment, the space where the shield breaker is displaced can be used for inspection and conversion work of the shield breaker. The conversion work can be easily performed, and the time and labor involved can be greatly reduced. In addition, in equipment combinations of each phase that are branched from the main bus line and arranged in parallel, the displaced axis of the breaker will move until it fits within the wasted space within the arrangement interval of other equipment.
The overall layout area is the same as the conventional layout area in which the beams and disconnectors are connected in a straight line.

Furthermore, even in equipment combinations of lines for each phase that are orthogonally branched to the left and right in parallel with the main bus bar as the border, by reversing the displacement directions of the left and right side sheath breakers, it is possible to Without changing the layout area of the devices connected in a straight line, it is possible to easily inspect and convert the breakers, and to save time and labor.

[Brief explanation of the drawing]

FIG. 1 is a single line diagram showing a gas insulated switchgear employing a double bus system, and FIGS. 2 and 3 are a plan view and a side view showing an embodiment of the gas insulated switchgear according to the present invention. DESCRIPTION OF SYMBOLS 1... A bus line, 2... A bus line, 3... Overhead transmission line connection unit, 4... Transformer connection unit, 5... A breaker on the unit 3 side, 6... Bus bar side current transformer, 8, 9...
Busbar side disconnector on the unit 3 side, 10...Line side current transformer, 11...Line side disconnector, 12...Earthing switch, 1
3...Cable termination box, 14...Gas insulated conduit, 15
...Unit 4 side sheath breaker, 16...Bus bar side current transformer,
7, 17... Branch busbar, 18, 19... Busbar side disconnector, 20... Track side current transformer, 21... Earthing switch, 2
2...Cable termination box, 23...Gas insulated conduit, 50
...Foundation, 51, 52...Shiya disconnector outlet, 53,
54...Curved branch busbar, L ₁ ...Axis of bow break, L ₂
...Equipment axis.

Claims (1)

[Claims] 1 A three-phase multi-bus line arranged in a straight line parallel to each other at a predetermined height above the plane of the foundation, and a three-phase multi-bus line that is electrically connected to each corresponding bus bar of the three-phase multi-bus line and A bridge disconnector, a disconnector, a current transformer, a branch busbar, and other equipment combinations are arranged below the busbar and parallel to the busbar, and are arranged in parallel with the busbar at right and left directions. The equipment except for A gas insulated switchgear characterized in that the device is arranged horizontally on an axis that is displaced parallel to the opposite side to the axis of the device, and is configured by connecting corresponding devices to outlets led out to both end sides of the device.