JPS6334685B2 - - 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 Figure 1, both ends of the tank containing the current-carrying conductors of the gas insulated busbars 1 and 2 and the insulating gas are connected to other phase tanks by conductive bars, that is, shorting bars 3 and 4, to support the tank. The mounts 5 and 6 are connected via rising ground wires 7 and 8 to a main ground wire 9, which 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, most of the induced current flows between the tank 2 - the shorting bar 4 - the tank 2 of the other phase - the other shorting bar 4, or , Tank 1-Short bar 3-
Flows into the tank 1-other short bar 3 circuit of the other phase,
The main grounding wire 9a between the gas insulated busbars 1 and 2 includes:
Almost no induced current due to the bus current flows, and much of it flows through the shorting bars 3 and 4. However, when the bus current directions are in the same direction, most of the induced current is from the grounding wire 9a - the rising grounding wire 7 - the tank 1 - the shorting bar 3 - the tank 1 of the other phase - the rising grounding wire 7 of the other phase - the others. Phase main grounding wire 9a - Other phase rising grounding wire 8 - Other phase tank 2 - Shorting bar 4 - Tank 2 -
The induced current flowing through the circuit of the rising grounding wire 8 and the shorting bar on the opposing gas insulated bus side is small, and the main grounding between the rising grounding wires 7 and 8 on the opposing gas insulated bus side and the gas insulated bus. line 9a
Most of it flows to . This causes the ground wire to heat up,
It is dangerous in exposed parts and has drawbacks such as causing the grounding wire to melt.

This invention was made in view of the above-mentioned drawbacks of the conventional grounding system for gas-insulated busbars, and an object of the present invention is to provide a gas-insulated busbar equipped with a grounding device that eliminates the above-mentioned drawbacks.

In order to achieve the above object, the present invention electrically connects the tanks, frames, etc. of gas insulated bus bars of the same phase installed in the tank axial direction for each phase with conductive bars, The present invention provides a gas insulated bus bar characterized by eliminating the main grounding wire between tanks of the same phase.

The present invention will be explained below based on the illustrated embodiments. As shown in FIG. 2, in this invention, a conductive bar, that is, a shorting bar 1 is connected between the gas insulated bus bars 1 and 2 to each tank.
0 is provided, and the main grounding wire (main grounding wire 9a in FIG. 1) between the gas insulated busbars 1 and 2 is removed. Second
In the figure, members that are the same as those in FIG. 1 are designated by the same reference numerals, and their explanations will be omitted.

By doing this, the gas insulated bus 1,
When the two busbar current directions are the same, most of the induced current is from tank 2 to shorting bar 10 to tank 1.
- Shorting bar 3 - Tank 1 of other phase - Shorting bar 10 of other phase - Tank 2 of other phase - Shorting bar 4 circuit, and most of the induced current flows to shorting bars 3, 4, 10 and to main grounding wire 9. Less induced current flows. Although not shown, a gas circuit breaker may be installed between the gas insulated buses 1 and 2.

As described above, according to the present invention, the induced current flowing through the ground wire can be reduced, so 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 an effect.

[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...
Conductive bar or shorting bar.

Claims (1)

[Claims] 1 Multiple tanks containing current-carrying conductors and insulating gas are arranged in parallel with different phases, and multiple 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 type gas insulated bus, either of the facing tanks and frames of the same phase are electrically connected for each phase by a conductive bar, and the main grounding wire between the tanks of the same phase is connected electrically. A gas insulated bus bar characterized by being formed by removing.