JPS6350922B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a gas insulated switchgear,
In particular, the present invention relates to an improvement in the connection method between the main bus and the busbar switching disconnector of a gas-insulated switchgear to which the so-called double busbar one-disconnector busbar system is applied.

Fig. 1 is a single line diagram showing the electrical connection relationship between a typical external drawer unit and the bus of the double bus 1 line and disconnection bus system, and the numbers 2 to 1 are
Components corresponding to FIG. 0 are shown, and those in FIG. 1 are common to each phase. FIG. 2 is an external plan view showing one embodiment of a conventional gas insulated switchgear corresponding to FIG. 1 above. In addition, the code numbers are A, respectively.
B and C are added to distinguish the A, B, and C phases.

In FIGS. 1 to 3, one set of external lead-out units includes, for example, a bushing 11 connected to an overhead power transmission line (not shown), a lightning arrester 12, a power transmission line lead-out disconnector 10, a shingle breaker 7, and a switching disconnector for the upper bus line. Vessel 3,
Busbar switching disconnector 4, busbar switching disconnector 3, 4
Branch connection busbars 5a, 5 connecting the Toshiya disconnector 7
b, current transformers 6, 8, etc. The other set of external draw-out units includes, for example, a branch bus 19 connected to the transformer 20, current transformers 18 and 16, a shield breaker 17,
A connection bus bar 15a that connects the switching disconnectors 13 and 14 for busbars, the bow disconnector 17 and the switching disconnectors 13 and 14,
15b etc. 1 is the main bus line A and 2 is the main bus line Otsu.

As shown in Fig. 4, the first bus line 1 is a three-phase conductor 21.
A, 21B, 21C, O bus 2 are three-phase conductors 22
This is a so-called three-phase gas-insulated main bus in which A, 22B, and 22C are each housed in one container.
Both generatrix lines are parallel and horizontal and arranged perpendicular to the axial direction of the external drawer unit. As is clear from FIG. 2, the connection between the external drawer unit and the main bus bar is the same for each phase, so only the A phase will be explained below, and the numbers A, B, and C after the reference numerals will be omitted. Switching and disconnecting switches 3 and 13 for the first bus line are arranged above the first bus line 1, and switching and disconnecting switches 4 and 14 for the first bus line are arranged above the first bus line 2. The lower part of each busbar switching disconnector is connected to the upper openings 1a and 2a of the three-phase bulk type main busbar,
Support insulating spacers 3', 1 that support the internal conductors of each of the above-mentioned disconnectors and separate the gas between the main bus and the disconnectors.
3' is provided at the lower end of the disconnector.

For example, as shown in FIGS. 4 and 5, the lower part of the upper busbar switching disconnector 3 is connected to the upper opening 1 of the upper busbar 1.
connected to a. A support insulating spacer 3' supporting the internal conductor 30 of the disconnector 3 is provided at the lower part of the disconnector 3 to separate the upper bus bar 1 from the gas-tight section of the disconnector 3. In this way, the A and O bus bars require one open connection part corresponding to each bus bar switching disconnector.

Furthermore, as shown in FIGS. 4 and 5, for example, disconnectors 3 and 4 for the busbar for a set of external drawer units electrically connect the upper conductor parts 3'' and 4'' of these disconnectors. It has a section 5b of the branch connection bus 5 to be connected, and also has a disconnector 7 through the section 5a.
is connected to.

The disadvantages of such conventional gas insulated switchgear are as follows.

(1) As shown in Figure 5, it is necessary to provide many openings above the three-phase busbar. That is,
For the two sets of external drawer units, a total of 12 openings are required, six on the first bus line 1 and six on the second bus line 2. In general, a three-phase all-in-one gas insulated bus has a container diameter larger than that of a phase-separated gas insulated bus, but it is not economical to provide many openings in a container with such a large diameter.

(2) Since the structure is such that an insulating support spacer is provided between the main busbars (A busbar 1, Atsubusbar 2) and the bus switching disconnect switch, that is, directly above the main busbar, to separate the gas, the main busbar It is difficult to dissipate the heat generated by energization of the internal conductors (there are three in the three-phase collective type) by gas convection in the main bus. Due to its existence, it is difficult to carry out. Therefore, it is not suitable as a main bus for large currents.

(3) The above-mentioned busbar switching disconnector is required to quickly cut off the busbar loop current when switching the busbars, but at this time, the metal of the contact, etc., which is consumed by the arc, falls onto the surface of the insulating spacer due to gravity. Metal powder is deposited on the surface of the insulating spacer, which tends to have a negative effect on the insulation performance, and the reliability of the insulation ability is low.

This invention was made in order to eliminate the drawbacks of the above-mentioned conventional ones, and it reduces the number of openings in the main bus bar, and removes the insulating spacer from the lower end of the bus switching disconnector to prevent gas convection within the main bus bar. The object of the present invention is to provide a gas insulated switchgear that is suitable for large current gas insulated switchgear, has excellent economic efficiency, and has high reliability in terms of insulation performance by improving heat dissipation due to heat dissipation.

In order to achieve the above object, the present invention provides a connection branch section, that is, an adapter, for electrically connecting the busbar switching disconnectors of two sets of external drawer units, and connects the connection branch section above the main busbar. They are arranged parallel to the axial direction of the main busbar, and the connection branch has openings in three directions: horizontally at both ends and downward in the center, and the openings at both ends are used to connect the main bus of each set of external drawer units. The bus bar switching disconnector is connected by providing an opening in the horizontal direction at the bottom, the downward opening in the center is electrically connected to the main bus bar, and this connection part is characterized by not providing an insulating spacer. The company provides gas-insulated switchgear.

The invention will now be described with reference to the illustrated embodiments. FIG. 6 is a single line diagram of a gas insulated switchgear according to the present invention, and the constituent elements are almost the same as those in FIG. 1 except for connection branches (adapters) 1' and 2'.

As shown in Figures 7-9, and especially in Figure 10, 1
The upper busbar disconnector 3 of one set of external drawer units and the upper busbar disconnector 13 of the other set of external drawer units
The arrangement of the disconnector 3 above the busbar 1 is the same as the conventional one, but in this invention, the
Do not electrically connect directly downward from the lower end of 13 to the busbar 1. A connecting branch part (adapter) 1' is provided in the middle of the line connecting the lower parts of the disconnecting parts of the disconnecting switches 3 and 13,
Through this, the lower internal conductors 30 and 130 of the disconnection sections of the busbar switching disconnectors 3 and 13 are electrically connected. An opening 1'a facing downward is provided in the center of the connecting branch 1', and the upper opening 1c of the upper bus bar 1 is connected to the connecting branch 1' and the upper bus bar 1 from directly below the connecting branch 1'. The structure also connects electrically. Although not shown in Figure 10, the bus line 2
The switching and disconnecting switches for the outer bus bar of the two sets of external drawer units will be the same as those for the upper bus bar.

In this way, in order to electrically connect the two sets of switching disconnectors 3 and 13 for the upper bus bar 1 to the upper bus bar 1, only one set of openings is required at the top of the upper bus bar 1, and two sets of external drawer units are required. 6 switching disconnectors for the upper busbar 3A, 3B, 3C and 13A, 13B, 1
By providing a connection branch 1' to electrically connect 3C to the upper bus bar 1, there are three connection openings for the upper bus bar 1 to the disconnector: openings 1cA, 1cB, and 1cC. . Similarly to the first bus line, there are three openings for connecting disconnectors on the second bus line: openings 2cA, 2cB, and 2cC (not shown).

In this way, the number of openings for connecting disconnectors for both the A and B busbars can be half the number of disconnectors, which is an advantage in that the number can be half that of the conventional one.

Furthermore, as shown in FIG. 10, an insulating spacer is not provided at the lower end of the lower part of the switch-over disconnect switch 3A, 13A for the upper busbar, and the lower conductor 30, 1 of the disconnect switch 3A, 13A is
Insulating spacers 3' and 13' are provided on the line connecting 30. For this reason, when the bus bar switching disconnect switch briefly cuts off the bus current, there is no insulating spacer on the surface to catch metal powder falling due to gravity, which is likely to occur especially when a large current is cut off. , has a highly reliable insulation structure. It is a well-studied fact that generally speaking, if foreign matter such as metal powder adheres to the surface of an insulating material, it tends to have a negative effect on insulation performance. In order to avoid this negative effect on insulation, a structure that allows the insulating spacer to be placed on a flat surface at the lower end is desired, and the present invention has great advantages in this respect as well.

Furthermore, a connection branch 1'A is provided to electrically connect the upper busbar 1 and the disconnectors 3A, 13A,
It is connected to the upper bus bar 1 at the downward opening in the center, and no insulating spacer is provided at this connection part.
The gas between the upper bus bar 1 and the disconnector 3A is separated by the connection branch 1'A and the insulating spacer 3' provided at the connection part of the switching disconnector 3A.
The gas division between the connecting branch 1'A and the switching disconnector 1
Since this is done with an insulating spacer 13' provided at the connection part 3A, the space between the connection branch part 1'A and the upper bus bar 1 remains open, and only the conductor passes through the inside.

With this structure, even if the conductor inside the upper bus bar generates heat, sufficient heat is radiated by the convection of the gas sealed within the upper bus bar. That is, it has a structure with excellent cooling effect and is excellent for use in large current gas insulated switchgear.

As described above, according to the present invention, the following effects are produced.

(1) Since no insulating spacer is provided at the bottom of the disconnector, it is possible to provide a gas insulated switchgear with extremely excellent insulation performance that prevents dielectric breakdown due to metal powder, etc.

(2) Since no insulating spacer is provided at the upper opening of the main bus bar, it is possible to provide a main bus bar with excellent cooling effects that can be expected to sufficiently dissipate heat through convection of the internally sealed gas.

(3) Since only one set of openings is required in the main bus bar to connect the main bus bar and two sets of disconnectors, the number of openings in the main bus bar can be halved, and an economical main bus bar can be provided.

(4) Since the connection branch is arranged above the main bus line so that it is parallel to the axial direction, the heights of the main bus lines A and B can be made the same height, so the height of the main bus lines A and B can be made the same height. It is possible to avoid the inconvenience of having to float one of the large main busbars on a frame because they cannot be made at the same height to create a two-tiered structure.

Further, in this invention, the branch part 1' for connecting the disconnector is provided at the upper part of the main bus bar, but it is also conceivable as an application of this invention to provide the branch part 1' at a horizontal position inside or outside the main bus bar. .

[Brief explanation of drawings]

Figure 1 is a single line diagram of a conventional gas insulated switchgear, Figure 2 is a plan view showing an example of a conventional gas insulated switchgear, Figure 3 is a side view as seen in the direction of the arrow in Figure 2, Figure 4 is an enlarged partial side view showing the right half of Figure 3 in more detail with a partial cross-sectional view, and Figure 5 is a cross-sectional view of a part of a conventional gas-insulated switchgear taken along the main bus line. 6 is a single line diagram of a gas insulated switchgear according to the present invention, FIG. 7 is a plan view of one embodiment of the gas insulated switchgear according to the present invention, and FIG. 8 is a diagram viewed in the direction of the arrow in FIG. FIG. 9 is a detailed side view similar to FIG. 4 of the gas insulated switchgear of FIGS. 7 and 8, and FIG. 10 is a detailed side view of the gas insulated switchgear of the present invention shown in FIGS. 7 to 9. FIG. 3 is a plan view taken along the main generatrix line, with a portion thereof being a cross-sectional view. 1...A (main) bus line, 2...B (main) bus line,
1', 2'... Connection branch (adapter), 1a, 1
b, 1c, 1'a... opening, 2a, 2b, 2c,
2'a... Opening, 3... Switching disconnector for the upper bus bar,
4...Switching disconnector for the busbar, 3', 13',...Insulating spacer, 3'', 13''...Top internal conductor of the disconnecting part of the disconnecting switch, 30,130...Lower internal conductor of the disconnecting part of the disconnecting switch , 5...external drawer branch busbar, 6, 8...
... Current transformer, 7... Edge breaker, 9... Connection between edge breaker and disconnector, 10... External drawer disconnector,
11...Butsing, 12...Surge arrester, 13...
Switching disconnector for the first bus, 14... Switching and disconnecting switch for the second bus, 15... External drawer branch bus, 16, 18...
...Optical flow device, 19...Transformer connection busbar, 20...Transformer, 21A, 21B, 21C...Conductor, 22
A, 22B, 22C...Conductor.

Claims (1)

[Claims] 1. A three-phase bulk type gas-insulated A/B-2 main bus bar consisting of three-phase conductors sealed together with an insulating gas in a single metal container, and a switching gas insulated disconnect switch for the A-bus line connected to each of these main buses; It consists of multiple sets of external draw-out units each consisting of a switching gas insulated disconnect switch for the main bus, a gas insulated disconnector, etc., and the switch disconnect switch for the bus of each set of external draw-out units is placed above the main bus. In a gas-insulated switchgear in which main busbars A and B are arranged horizontally in parallel, each of the main busbars A and B is equipped with a switching disconnector for the bus of one set of external draw-out units and a switch for the bus of the other set of external draw-out units. A connecting branch is provided to electrically connect the disconnecting switch, and this connecting branch is arranged above the main bus so that the line connecting both ends of the connecting branch is parallel to the axial direction of the main bus. The connecting branch is provided with openings in three directions, horizontally at both ends and downward in the center, and the connecting branch is connected to the lower part of the main bus switching disconnector of each set of external drawer units through the openings at both ends. The connecting branch is electrically connected to the main bus bar through the opening below the center, and no insulating spacer is provided in this connection. Gas insulated switchgear.