JPH0113285B2 - - 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.

Figure 1 is a single-line diagram showing the electrical connection relationship between a typical external drawer unit and the bus in the double bus line and disconnection bus system, and the numbers correspond to Figures 2 to 10. The components shown 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 draw-out units includes, for example, a bushing 11 connected to an overhead power transmission line (not shown), an earth arrester 12, a disconnector 10 for drawing out the power line, a shingle breaker 7, and a switching disconnector for the upper bus line. branch connection busbar portions 5a, 5 that connect the switch 3, the busbar switching disconnector 4, and the busbar switching disconnector 3, 4 and the sheath disconnector 7.
b, current transformers 6, 8, etc. Another set of external draw-out units includes, for example, a branch bus 19 connected to the transformer 20, current transformers 18, 16, a shield breaker 17, a bus switching disconnector 13, 14, a shield breaker 17, and a switching disconnector. Connection bus bars 15a, 1 connecting the devices 13, 14
5b 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 A,
B and C are 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.

As shown in Figure 5, the switching disconnector 3 for the upper bus bar,
A connecting branch (adapter) 1' is provided in the middle of the line connecting the lower parts of the disconnecting parts of the disconnectors 3 and 13, and the lower internal conductors 30 and 130 of the disconnecting parts of the disconnectors 3 and 13 are electrically connected through this. Then, the connection branch 1' and the upper bus bar 1 are electrically connected through the upper opening of the upper bus bar 1 at an opening extending downward from just below the center of the branch part 1'.

Furthermore, the connection between the bow disconnector 7 of the external drawer unit and the busbar switching disconnectors 3, 4 is as shown in FIG. '' and are connected at connection busbar portions 5b and 5a. Therefore, the connection busbars are connected at a high position of the disconnector.

Further, the vertical length of the connection branch 1' that connects the disconnector 3, the disconnector 13, and the upper bus bar 1 is short. This is because the length of the connection branch 1' is short in order to connect the internal conductors 30, 130 at the lower part of the disconnection section of the disconnectors 3, 13. Since this is short, the cooling effect of dissipating the amount of heat generated inside the main bus bar 1 is still insufficient even if this connecting branch portion 1' exists.

Conventional gas-insulated switchgear like this has the following problems: (1) The connection port to the busbar switching disconnector 3, 4 and the mustard disconnector 7 is located above the disconnection section of the busbar switching disconnector 3, 4, making it extremely difficult to operate. It will be in a high position.

(2) Connecting branch busbar section 5a between the external drawer unit's bow disconnector 7 and the busbar switching disconnector 3, 4;
5b is located at a high position, making it inconvenient to connect with the breaker 7, and the supporting frame etc. also become large, which is not economical.

(3) Since the vertical length of the connection branch 1' connecting the upper bus bar switching disconnector 3, 13 of the external drawer unit and the upper bus bar 1 is short, the heat inside the main bus bar 1 is radiated (main The cooling effect (due to gas convection within the bus bar) is insufficient. This also applies to the bus bar 2, and the cooling effect is insufficient.

There were drawbacks as mentioned above.

This invention was made in order to eliminate the drawbacks of the above-mentioned conventional ones, and it improves the connection method between the main bus and the bus disconnect switch, and also improves the connection port between the bus disconnect switch and the bus disconnect switch. The object of the present invention is to provide a gas-insulated switchgear that is suitable for large currents and is highly economical, by providing a connection branch that makes the heat dissipation effect of the amount of heat generated within the bus bar more effective.

In order to achieve the above object, the present invention has a connection branch section provided above the main busbar by a switching disconnector for the busbar of each set of external drawer units and an opening provided horizontally in the upper part of the disconnector. The present invention provides a gas insulated switchgear characterized in that the connection to the external drawer unit and the disconnector is made from the lower conductor of the disconnection section of the switching disconnector.

The invention will now be described with reference to illustrative embodiments. FIG. 6 is a single line diagram of the gas insulated switchgear of the present invention, and the components are exactly the same as those in FIG. 1.

Furthermore, since a connecting branch 1' is provided, the plan view of the device shown in FIG. 7 according to the present invention is similar to the conventional device shown in FIG. 3. That is, the switching disconnector 3 for the upper busbar of one set of external drawer units, and the switching disconnector 13 for the upper busbar of the external drawer unit of the other set.
The provision of a connecting branch 1' for electrically connecting the upper bus bar 1 and the upper bus bar 1 is the same as in the conventional case. However, in the present invention, the positions of the connection branch 1' and the connection ports of the switching and disconnecting switches for both busbars are different from those of the prior art.

As is clear from FIG. 5, in the conventional type, the internal conductor 3 at the lower part of the disconnecting section of the busbar switching disconnector 3, 13
0,130 were connected through the connecting branch part 1', but in this invention, as shown in FIG. are connected through a connecting branch 1'. In this way, the connecting branch portion 1' becomes longer in the vertical direction, making it easier to cause gas convection within the main bus bar, and making it possible to significantly increase the cooling effect. Therefore, the structure is suitable for use with large currents.

Furthermore, as is clear from FIGS. 8 and 9, portions 5b and 5a of the connection branch bus 5 that connect the upper busbar disconnector 3, the lower busbar disconnector 4, and the bottom busbar disconnector 7 of one set of external drawer units is the switching disconnector 3 for both busbars,
It is arranged so as to be connected to the inner conductors 30 and 40 on the lower side of the disconnection section of No. 4. This point differs from the conventional ones shown in FIGS. 3 and 4, in that the connection branch busbar 5 is located at a lower height. Therefore, this support frame may be small and economical, and has a structure suitable for coping with the recent trend toward higher voltages in gas-insulated switchgear.

In this way, in the gas insulated switchgear of the present invention, the connection of the busbar switching disconnector to the main bus is from the top of the disconnector, and the connection to the bottom of the busbar switching disconnector and the disconnector side is from the bottom of the disconnector. It has a structure that allows

In the gas insulated switchgear of the present invention constructed as described above, the connecting branch connecting between the busbar switching disconnectors and the main busbar has a naturally sufficient length in the vertical direction, so the cooling effect is large. be. Since the height of the branch busbar connected to the busbar switch and disconnector is low, it is economical and strong against earthquakes.

[Brief explanation of drawings]

Fig. 1 is a single line diagram of a conventional gas insulated switchgear, Fig. 2 is a plan view showing an example of a conventional gas insulated switchgear, Fig. 3 is a side view as seen in the direction of the arrow in Fig. 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 front 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'...Connection branch part (adapter), 3...Switching disconnector for the first bus, 4...Switching and disconnecting switch for the second bus, 3',
13'... Insulating spacer, 3'', 13''... Upper internal conductor of the disconnecting section of the disconnector, 30, 130... Lower internal conductor of the disconnecting section of the disconnecting switch, 5... External drawer connection branch bus bar, 5a, 5b... …Connection branch busbar part,
6, 8... Current transformer, 7... Edge breaker, 9... Connection between edge breaker and disconnector, 10... Disconnector for external drawer, 11... Bushing, 12... Evacuation electric appliances,
13...Switching disconnector for the first bus, 14...Switching and disconnecting switch for the second bus, 15...External drawer branch bus, 1
6, 18...Current transformer, 19...Transformer connection bus,
20...Transformer, 21A, 21B, 21C...Conductor, 22A, 22B, 22C...Conductor.

Claims (1)

[Claims] 1. A three-phase gas-insulated A-2 main bus bar made by enclosing three-phase conductors together with insulating gas in a single metal container, and a switching disconnector for the A-bus line connected to each of these main bus bars, and an O-bus line. It consists of multiple sets of external drawer units consisting of switching disconnectors, gas cylinders, disconnectors, etc., and the busbar switching disconnectors of each set of external drawer units are placed above the main busbar, and the main busbars A and B are connected in parallel. A connection for electrically connecting the bus switching disconnector of one set of external drawer units and the busbar switching disconnector of the other set of external drawer units to each of the main busbars A and B. A gas insulated switchgear in which a branch is provided and the connecting branch is arranged above the main bus so that a line connecting both ends of the connecting branch is parallel to the axial direction of the main bus.
The connection branch section above is connected to the internal conductor on the upper part of the disconnecting section of the switching disconnector for both buses, and the connecting branch bus that connects the switching disconnector for the first bus, the switching disconnector for the second bus, and the second bus is the busbar. A gas insulated switchgear, characterized in that it is connected to an internal conductor at the bottom of a disconnection section of a switching disconnector.