JPS626817Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a gas-insulated bus bar having built-in bus conductors for three phases.

[Technical background and problems of the invention]

In recent years, in substations and switchyards in and around large cities, equipment such as circuit breakers, transformers, current transformers, and disconnectors are housed in insulating gas tanks.
By connecting them with gas-insulated busbars and arranging them three-dimensionally, we plan to significantly reduce the land area required.

The structure of a gas insulated bus bar used in such equipment is generally constructed as shown in FIGS. 1 and 2. That is, 1 is a cylindrical case, 3a, 3b, 3
c is a three-phase busbar conductor made of aluminum,
The bus conductors 3a, 3b, and 3c are arranged triangularly in the case 1, and are supported by insulating spacers 2 that extend through the case in the axial direction and are provided at the case connection portion. 4a and 4b are branch conductors made of aluminum and branched from the busbar conductors 3a and 3b, and these branch conductors 4a and 4b are led to branch cases 6a and 6b attached to tube seats 5a and 5b of case 1 and connected to equipment not shown. do. 7 is an insulating spacer that supports the branch conductors 4a and 4b.

By the way, when a branch conductor is provided for the three-phase bus conductors 3a, 3b, and 3c arranged triangularly in the case 1 as described above, the branch conductor 4b branching from the one-phase bus conductor 3b is connected to the other two bus conductors. It will be drawn out through between the bus conductors 3a and 3c. Therefore, the insulation distance between the branch conductor 4b and the two-phase bus conductors 3a and 3c is shorter than that of the other parts. On the other hand, as the capacity of substations increases, the diameter of the bus conductor becomes larger. At this time, if the size of the busbar case 1 is constant, insulation is guaranteed in most of the case even if the busbar conductors 3a to 3c have different diameters, but the part where the branch conductor 4b is provided is As described above, since the insulation distance between the conductor 4b and the bus conductors 3a, 3c is short, it becomes difficult to obtain a predetermined withstand voltage. Therefore, since it is necessary to widen the phase spacing of the entire bus conductor for the branch conductor portion, the case 1 and the insulating spacer 2 become large, which increases the cost and increases the size of the entire device.

[Purpose of invention]

The present invention was developed in view of the above circumstances, and even if the conductor diameter of the three-phase bus conductor is increased to increase the current carrying capacity, the interphase insulation distance at the branch conductor installation part can be maintained sufficiently without changing the phase spacing of the conductor. The purpose of the present invention is to provide a small and economical gas-insulated busbar that can be secured to

[Summary of the idea]

The present invention consists of a cylindrical case, bus conductors for three phases arranged triangularly inside the case and inserted in the axial direction, and a bus conductor branching from one phase of each phase bus conductor and connecting the bus conductors of the other two phases. and a branch conductor drawn out through said branch conductor and said two
The intersecting portion of one or both of the phase bus conductors is formed of a conductive member having a smaller conductor diameter and higher conductivity than the respective conductors.

[Example of idea]

Embodiment 1 As shown in FIGS. 3 and 4, bus conductors 3a, 3b, 3c for three phases are arranged triangularly in case 1.
The branch conductor 4b, which is branched from the bus conductor 3b of one phase and drawn out between the bus conductors 3a and 3c of the other phase, intersects with the bus conductors 3a and 3c with a diameter smaller than that of the conductor 4b and conductive. The conductive member 14b is made of a high conductive material such as copper or silver-containing copper. In the drawings, the same parts as those shown in FIGS. 1 and 2 are given the same reference numerals, and the explanation of those parts will be omitted.

With this configuration, even if the conductor diameters of the bus conductors 3a to 3c are increased in order to increase current carrying capacity, a sufficient insulation distance between the branch conductor 4b and the bus conductors 3a and 3c can be ensured. Therefore, bus conductors 3a to 3
It can be manufactured compactly and economically even for a large capacity device without increasing the phase spacing of c or the bus bar case 1. Further, since the conductor crossing portion of the branch conductor 4b is formed of the member 14b having a higher conductivity than other portions, the current carrying capacity will not be affected even if the conductor diameter is made thinner.

Example 2 Two-phase bus conductor 3 as shown in Figs. 5 and 6
The portions a and 3c intersect with the branch conductors 4b are connected to a conductive member 1 having a smaller conductor diameter than the conductors 3a and 3c, and made of copper, silver-containing copper, or the like having high electrical conductivity.
3a and 13b, the same effect as in the first embodiment can be obtained.

Further, as in the first embodiment, a conductive member 14b having a reduced diameter is provided at the conductor intersection portion of the branch conductor 4b, and
As in Embodiment 2, conductor portions 13a, 1 with reduced diameters are also provided at the conductor intersection portions of the two-phase busbar conductors 3a, 3c, respectively.
3c may also be provided.

[Effect of idea]

Since the present invention has the above-mentioned configuration, even if the conductor diameter of the bus conductor for three phases is increased in order to increase the capacity, the branch conductor drawn out from one phase through between the bus conductors of the other two phases is It is possible to provide a small and economical gas-insulated bus bar that can ensure sufficient phase-to-phase insulation.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional gas insulated bus bar, Fig. 2 is a sectional view taken along the line in Fig. 1, Fig. 3 is a sectional view showing the first embodiment of the gas insulated bus bar of the present invention, and Fig. 4 is a sectional view taken along the line in FIG. 3, FIG. 5 is a sectional view showing the second embodiment of the present invention, and FIG.
It is a line arrow view. 1... Case, 3a, 3b, 3c... Bus conductor, 4b... Branch conductor, 13a, 13c, 14b
...Conductive member.

Claims (1)

[Scope of utility model registration request] A cylindrical case filled with insulating gas, bus conductors for three phases arranged triangularly inside this case and inserted in the axial direction, and bus conductors for the other two phases that branch from one phase of each phase bus conductor. and a branch conductor drawn out through the conductor, the conductor intersection portion of either or both of the branch conductor and the two-phase bus conductor is connected to a conductor having a diameter smaller than that of the conductor and having a lower conductivity. A gas insulated bus bar characterized by being formed of a higher conductive material.