JPS6334684B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas insulated bus bar, and more particularly to a grounding system for a gas insulated bus bar.

To explain the conventional grounding method for gas-insulated busbars,
As shown in Fig. 1, both ends of the tank containing the same-phase current-carrying conductors and insulating gas of the gas insulated buses 1 and 2 are connected to other-phase tanks by conductive bars, that is, shorting bars 3 and 4. The supporting frames 5 and 6 are connected via rising ground wires 7 and 8 to a main ground wire 9 that is part of a ground network buried underground.

In such a configuration, when the bus current directions of the gas insulated buses 1 and 2 are in different directions, the gas insulated bus 1
Almost no induced current due to the bus bar current flows through the main grounding wire 9a between and 2, and much of it flows through the shorting bars 3 and 4. However, when the bus current directions are in the same direction, the induced current flowing through the shorting bar on the opposing gas insulated bus side is small, and the rising ground wires 7 and 8 on the opposing gas insulated bus side and the gas insulated bus Most of the current flows through the main grounding wire 9a between them. For this reason, the exposed portion of the grounding wire becomes heated and is dangerous, and there are also drawbacks such as causing the grounding wire to melt.

This invention relates to a gas insulated bus bar, and was made in particular in view of the above-mentioned drawbacks of the conventional grounding system for gas-insulated bus bars.It is an object of the present invention to provide a gas-insulated bus bar equipped with a grounding device that eliminates the above-mentioned drawbacks. This is a daily thing.

In order to achieve the above object, this invention collects the grounding wires of gas-insulated bus bars, tanks, etc. of the same phase in one place, and connects them to a part of the grounding network buried in the site where the tank is installed. The present invention provides a gas insulated bus bar which is characterized in that it is connected to the main ground wire buried in parallel with the gas insulated bus bar at one point, and in the center of the tank.

The present invention will be explained below based on the illustrated embodiments.

As shown in Fig. 2, an auxiliary grounding wire 10 is provided in parallel with the gas insulated busbars 1 and 2, and rising grounding wires 7 and 8 are connected to this to ground each tank and frame 5 and 6 of the gas insulated busbar. do. Also, the auxiliary grounding wire 10
are connected to a main grounding wire 9, which is part of a grounding network buried in the site where the tank is installed, at only one location, and through a connecting grounding wire 11 at the center of the tank on the gas-insulated bus bar. Other configurations are in the second
In the figure, members that are the same as those in FIG. 1 are designated by the same reference numerals, so their explanation will be omitted.

By doing so, the induced current in Figure 1
It is clear that compared to the loop of i ₁ , the loop of induced current i ₂ in FIG. 2 has a longer distance, the impedance increases, and the induced current decreases. Although not shown, a gas circuit breaker may be installed between the gas insulated bus bars 1 and 2.

As described above, according to the present invention, since the current flowing through the ground wire can be reduced, heating of the ground wire can be prevented, the safety of exposed ground wires can be improved, and melting of the ground wire due to overheating can be prevented. There is.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a conventional gas insulated bus bar, and FIG. 2 is a perspective view showing an embodiment of the gas insulated bus bar of the present invention. 1... Gas insulated bus bar, 2... Gas insulated bus bar, 3
... Short circuit bar, 4 ... Short circuit bar, 5 ... Frame, 6
... Frame, 7... Standing grounding wire, 8... Standing grounding wire, 9, 9a... Main grounding wire, 10...
Auxiliary ground wire, 11...Connection ground wire.

Claims (1)

[Claims] 1 A plurality of tanks containing current-carrying conductors and insulating gas are arranged in parallel with different phases, and a plurality of tanks are installed in the axial direction, and both ends of the tanks are electrically connected by conductive bars across the phases. In a phase-separated gas-insulated busbar, the grounding wires of the same-phase mount and the tank are collected in one place, and they are connected as part of the grounding network buried in the site where the tank is installed, and A gas insulated bus bar, characterized in that the gas insulated bus bar is connected to main ground wires buried parallel to the tank and connected to each other outside the tank at one point, and at the center of the tank.