JPS592515A - Gas insulated switching device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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]

Recently, electricity stations being constructed are making advanced use of the insulation and arc-extinguishing properties of SFB gas to install busbars and disconnectors.

There are many gas-insulated switchgears that are integrated and reduced in size by combining circuit breakers, grounding devices, etc. The feature of this gas-insulated switchgear is that it is possible to change the combination method of the bus bar, disconnector, circuit breaker, etc. Lines can be brought in using aerial bushings for overhead transmission lines, and cable head junction boxes for underground transmission lines (two suitable methods are used), and the method for connecting to the transformer is either a cable method or a direct connection method. has been adopted.

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, Each component connection unit of the overhead power transmission line connection unit 3 for multiple systems is placed on one side (2), and each component connection unit for the transformer connection unit 4 for multiple systems is placed on the other side. In other words, one outlet of the circuit breaker 5 of the power transmission line connection unit 3 is connected to the bus-side current transformer 6.
, are connected to the first bus 1 and the second bus 2 via the branch bus 7 and each bus side disconnector 8.9, and the other sunrise is
Line side current transformer 10. Track side disconnector 11, earthing switch 12
and gas insulated conduit busbar 1 via cable junction box 13
Connected to 4. These devices are interconnected to form a device assembly.

Similarly, one of the circuit breakers 15 of the transformer connection unit 4 is connected to the upper busbar 1 and the busbar 2 ( = is connected, and the other sun is also connected to the gas insulated conduit bus O through the line side current transformer side, the earthing switch 21, and the cable connection box n.

Overhead power line connection unit 3 and transformer connection unit 4
and its circuit breaker 5, 15, disconnector 8.9゜18.19
These devices are assembled into two sealed containers to form a single device, which are then connected together (two devices connected together).

That is, for example, as shown in Japanese Patent Publication No. 53-42100 and % Opening and Closing Publication No. 55-32500, the container of the breaker is placed horizontally (2) and the breaker (2 connected disconnectors) A series of linear arrangements (=connecting devices such as devices, branch busbars, etc.) and arranging them at a position t that is approximately perpendicular to the main busbar at a position shifted downward from the axis of these connected devices; Connecting equipment shall be constructed by arranging it in parallel with the main bus line at a predetermined equal interval (every two circuits).

Among these power protection devices, the circuit breaker (two of them) is inspected taking into account the number of times the faulty vehicle is cut off when the power transmission circuit fails, the number of times the load current is cut off during steady state, and the period of commercial operation. (In many cases, compatibility is required in order to replace the main unit in the event of a failure.)

Connect devices such as 1 branch, 4 kasuri, etc. to the above-mentioned breaker in a series of linear arrangements, and connect this linear equipment connection for each line with the live bus line as the center (2 left and right (2 parallel arranged) However, the workability of inspecting the circuit breaker and replacing the main unit is very poor.

In other words, when inspecting the breaker section of a breaker, since both ends of the breaker are connected to other equipment, it is necessary to install an appropriate manhole on the side of the breaker container to make it easier to inspect the inside of the breaker container. In addition, when carrying out detailed inspections including the replacement of some parts, it is necessary to pull out the external shut-off section. Inside the container (Two people will be required to divide the breaker into pieces that can be removed from the manhole diameter, take them outside, and after the inspection is completed, they will reassemble the breaker in the container again. .

In order to efficiently perform this series of operations within the breaker container, it is necessary to increase the diameter of the manhole and the diameter of the breaker container. However, increasing the diameter of the manhole and the breaker container results in an increase in the manufacturing cost of the breaker. Disassembling and reassembling the breaker, which has a complicated structure, within a container with a originally limited caliber (= will cause incorrect work and impair the reliability of the breaker itself.

(- Considering the work of converting a circuit breaker, in order to remove a circuit breaker from a group of connected devices arranged in a straight line, remove a few connections between the circuit breaker and the devices connected to it, and then A gap is provided in a part of the device group that is connected in series in two directions, such as the flexible bus bar incorporated in the device group, and this gap is used to shift the breaker body laterally. This involves a step of pulling out and moving it in the axial direction on the opposite side where the generatrix is placed.
No. 100 and Japanese Unexamined Patent Publication No. 55-32500 (2) In the two figures, the main bus bar is connected to the lower C2 device, and the connecting equipment groups such as the wire breakers, disconnectors, and branch bus bars are arranged in a series of straight lines on the upper part. This is because the axial center height of the breaker container is located above the main busbar, so it is relatively high.
In order to safely replace the breaker body, it is necessary to use a method such as making the lower legs of the breaker splittable and removing it, lowering the center of gravity of the breaker container and moving it. In the conventional arrangement, replacing the breaker body required a great deal of time and effort.

[Purpose of the invention]

The purpose of the present invention is to perform the inspection work of the breaker and the 3! : To provide a gas-insulated switchgear that facilitates replacement work and can significantly reduce the time and effort required to perform the work.

[Summary of the invention]

In the gas insulated switchgear of the present invention, the breaker is arranged horizontally, and the connection parts with other equipment provided at both ends are configured in a U-shape when viewed from above, and are connected to the breaker. The other equipment and branch lines are arranged in a straight line across the breaker, and their axes are parallel to the axis of the breaker at a certain distance.

[Invention and Examples] The present invention will be described below with reference to an example 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 IA, IB, IC and 2A at the height Hl from the basic force.
, 2B, and 2C are installed to form a double bus system.

Each phase bus bar is configured as shown in FIG. This bus line IA,
Each device of the overhead power transmission line connection circuit unit 3 is installed on the side of the IB and IC as described below, and the bus lines 2A, 2B,
Each device of the transformer connection circuit unit 4 is arranged on the side of 2C as described below. Since the equipment constituting both units 3.4 has the same configuration for each phase, for convenience, the C phase will be explained as an example. Distinguish by adding .

Again in FIGS. 2 and 3, the breaker 5C of the magnetic line connection unit 3 is set so that its axis is horizontal with respect to the basic force, and is connected to other equipment on the sides of both ends. Connecting ports 51C and 52C are
(= derived, these exit parts 51C, 52C
A multi-branch bus line 52 is used to change the exit direction by 90 degrees.
C, 53C are provided. That is, the breaker 5C is arranged horizontally on the foundation (3), and its outlets 51C and 52C are led out parallel to the foundation I and at right angles to the axis of the breaker 5C, 9 by 53C
It is turned 0 degrees to match the axial direction.

The song on one outlet 51C of the breaker 5C is the multi-branch bus 52.
At C, a bus-side current transformer 6C and a linear branch bus 7C are connected, and from this branch bus 7C via a bus-side disconnector 8C, the bus IC is connected, and also via a bus-side disconnector 9C to the bus 2CT.
Two are connected. In addition, the multi-branch bus 53C of the other sunrise 52C of the circuit breaker 5C is connected to the cable termination box 13C (two connected, and gas-insulated Conduit 140
Mouth connected.

Similarly, the breaker 615C of the transformer connection unit 4 is arranged horizontally with respect to the foundation, and the outlet 51C is on the side of both ends of the breaker 615C.
52C is drawn out so that it has an inverted U-shape when viewed from above, and furthermore, (the two exits 51C and 52C are connected to the multi-branch busbars 53C and 54C, which change direction at 90 degrees. The multi-branch bus 54C is the bus side current transformer 16C.
and branch bus 17C (two connected, further connected to bus 1C via bus-side disconnector 18C, and bus-side disconnector 19C)
It is connected to bus bar 2C via.

In addition, the other sunrise 52C of the breaker 15C is connected to the line side current transformer 20C1 grounding switch 21C and the cable termination box 22.
C, and is connected to the gas insulated conduit 23C (-) from here.

In both the power transmission line connection unit 3 and the transformer connection unit 4, the equipment configurations of the other phases A and H are arranged in the same manner as the C phase. In addition, not only one line but also the required number of lines (
It is branched and connected from bus lines 1 and 2 across two lines. Second
In the figure, looking at the arrangement of equipment between each phase, circuit breakers 5A, 5B, and 5C are derived as sunrise'&U-shaped, and circuit breakers 15A and 15B.

The eye appearance of 15C was derived as an inverted U shape (-yoshi,
Equipment connections for each phase (there is now a single axis, i.e. each circuit breaker 5A, 5B, 5C and 15
The first axis line in A, 15B, 15C,
-L.

In addition, other equipment connections excluding these circuit breakers (the second axis L2-L2 in the second axis) are now connected to each phase A, B,
C (4-unit connected body is spaced in parallel with vfhl+l and equally spaced (two devices, circuit breakers 5A, 5B).

The dimensions of the sunrise part of the breaker should be controlled so that the axis of 5C coincides with the interval 19. Each phase breaker 5A.

5B and 5C will be installed exactly in the middle of each phase equipment interval /+/. This interval A+7 is for each phase breaker 5A, 5
It is convenient for working on B and 5C, and for replacing the breaker.
1 is a required dimension even if the breaker is arranged in a straight line (-) with other equipment, and in this invention, the space that is conventionally wasted (2) The breaker is placed horizontally, and that space is used to disconnect the breaker. I decided to inspect the device and replace it with a 52".

Furthermore, when looking at the mutual equipment connection between the two-line aerial power transmission line connection unit 3 and the transformer connection unit 4, while the circuit breakers 5A, 5B, and 5C of the unit 3 have a U-shaped configuration, Unit 4 breaker 15A.

Because the sunrises of 15B and 15C have an inverted U-shaped configuration,
The following convenient arrangement relationships can be used.

That is, on the extension line of the axis L2L2 of the device connection body of unit 3 (-breakers 15A, 15B of unit 4,
The equipment can be arranged so that the axes L1'L and L' of 15C coincide with each other, and the breaker can be pulled out as shown by arrow F. In addition, the arrangement direction of the main busbars 1 and 2 (the planar space expansion pY on the side of the power transmission line unit 3,
The planar space width z of the equipment on the transformer connection unit 4 side is the same width y, which is equal to the width y of the conventional equipment arrangement.

In addition, the overall width W2 of the power transmission line connection unit 3 and the transformer connection unit perpendicular to the main busbar arrangement direction is the same as the case where the breaker's sunrise is led out to the longitudinal end (compared to the U-shaped breaker's U-shape). It is possible to shorten the length by the difference in the length of the lead-out section.As a result, it is possible to reduce the space required for the entire gas-insulated switchgear, and the overall site space of the electrical station can be further reduced. It can be reduced.

In the equipment arrangement of the gas insulated switchgear according to the present invention shown in FIGS. 2 and 3, what are the circuit breakers 5A, 5B, 5C of the power transmission line connection unit 3 and the circuit breakers 15A, 15B, 15C of the transformer connection unit 4? , its axis Ls
Lr and L1'LH' are horizontal and on the same plane, and the main bus lines IA, IB, and IC are shifted upward from this plane.
and 2A, 2B, and 20 are arranged parallel to each other on the same plane, and their main busbars are bus disconnectors 8.
9.17, 19. And the equipment was placed below the main bus line (second, breaker 5.
The shaft center height h2 of 15 has a low center of gravity, which makes it convenient for attaching and detaching the breaker when replacing it.

For example, in order to inspect the breaker 5A, if the cover plate G on at least one side of the breaker container can be opened and closed, the cover plate G can be opened and the breaker can be easily inspected. It is possible to make it visible.This is possible because the sunrise of the breaker is configured in a U-shape, and the space facing the cover plate G has a margin of 1+l.Also, when the breaker is pulled out, The songs include Kuchide 51C and 52C)
If you disconnect from the branch bus 52C953C, the interval will be 1+l
Move the breaker in the direction of arrow F using
Let's do the second one. This can also be achieved by making the breaker have a U-shaped configuration and by providing a space of 11+ll between each phase.

Although the embodiment shown in FIGS. 2 and 3 has a 2NN bus type configuration, the equipment can be arranged in the same way even if a single bus type is adopted, and the main bus can be replaced with a three-phase collective bus ( - It can be implemented in the same way even if configured.

〔Effect of the invention〕

As described above, in the present invention, among equipment combinations such as live busbars (breakers connected in two branches, disconnectors, current transformers, branch buses, etc.), equipment other than the breaker is placed on the same axis (two connected , the axis of the breaker displaced from the equipment's It is possible to easily carry out the work, reduce the time and effort required, and reduce the 4 major I]VA Until the axis line is within the wasted space (2) within the arrangement interval of other equipment, the overall arrangement area is the same as the conventional arrangement area in which circuit breakers are connected in a straight line.

Furthermore, the left and right sides (=equipment combinations of each phase and each line branched orthogonally in parallel) across the main busbar (in both cases, the displacement directions of the left and right circuit breakers are reversed). , without changing the layout area of conventional circuit breakers connected in a straight line, inspection and conversion work of circuit breakers can be facilitated and time and labor can be saved.

[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.

Claims (5)

[Claims] (1) A position at a predetermined height from the plane of the foundation (a main busbar arranged in two straight lines, and a main busbar (= electrically branch-connected and orthogonal to the main busbar at a position below the main busbar) equipment combinations such as circuit breakers, disconnectors, current transformers, and branch bus bars arranged in is a gas-insulated switchgear system characterized in that the analyzer is placed horizontally along the axis of the device, and the openings at both ends are connected to the corresponding devices. Device. (2) The main bus is configured into a three-phase multi-bus line arranged in parallel in a straight line, and each phase bus line (= circuit breaker, disconnector, current transformer, branch bus, etc.) is arranged in parallel. The gas insulated switchgear according to claim 1, characterized in that it is branch-connected. (3) The breaker in the equipment assembly is placed horizontally (two configurations, and a pair of openings are drawn out from near both ends in the axial direction at right angles to this axis (two) and in the horizontal direction, and these two openings are placed at right angles to each other in the horizontal direction. (The gas insulated switchgear according to claim 1, wherein the gas insulated switchgear is connected to a corresponding device via a curved branch bus bar which is replaced by two. (4) Two three-phase multi-bus lines arranged parallel to each other at a predetermined height from the plane of the foundation, and each corresponding bus bar of this three-phase multi-bus line (two electrically connected and a device combination such as a circuit breaker, a disconnector, a current transformer, a branch bus, and the like, which are arranged parallel to the three-phase multi-bus at right and left at right and left below the three-phase compound bus, and each of the device combinations The equipment except the circuit breaker is connected to each other on the same axis, and the circuit breaker is connected to the left and right sides of the three-phase multi-bus line by an interval that allows the breaker to be moved in the axial direction from the axis of the equipment. A gas insulated switchgear characterized in that it is constructed by connecting two axes (displaced horizontally) parallel to the opposite side to the axis of the equipment, and connecting corresponding equipment to the respective ends of the axis. (5) A three-phase multi-bus line is used as the boundary between the left and right C. The device combinations of each phase are arranged parallel to each other, such as the axis of the left device and the axis of the right breaker, and the axis of the right device and the left side. 5. The gas insulated switchgear according to claim 4, wherein the circuit breakers are arranged in parallel so that their axes coincide with each other.