JPS6046604B2 - Sealed three-phase busbar - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealed three-phase busbar, and more particularly to an improvement in the connection between a three-phase collective busbar and a three-phase collective busbar having an axis perpendicular to the axis of the three-phase collective busbar.

BACKGROUND ART A sealed three-phase bus bar in which conductors of each phase are arranged in a sealed conduit filled with an insulating gas having high dielectric strength such as sulfur hexafluoride (SF6) gas is known.

In this type of conventional closed type three-phase bus, when a three-phase all-in-one bus is provided at the end of the three-phase all-in-one bus bar, which branches at right angles to the three-phase all-in-one bus, it is usually a three-phase all-in-one bus as shown in Figure 1 a to c. A T-shaped three-phase all-in-one connection bus 3 is provided at the end of the bus 1 (hereinafter abbreviated as the bus), and a three-phase all-in-one connection bus 3 in a direction perpendicular to the bus 1 is provided on the branch connection side of this T-shaped three-phase all-in-one connection bus. Bus line 2 (
(hereinafter abbreviated as bus bar).

In this case, the bus 1 has each phase bus conductor a, b, .
c, and the bus 2 has each phase bus conductor a in the conduit 5.

,b. , C2 are arranged at each vertex of an isosceles Ξ-gon as shown, and each phase bus conductor is supported by a support insulator 6 provided at the end of the conduit. The arrangement of the phase bus conductors inside the bus bars 1 and 2 may be an isosceles Ξ-gonal arrangement; for example, although the illustration describes an isosceles right-angled Ξ-gonal arrangement, it may be an equilateral triangular arrangement. However, each bus conductor arrangement of bus bars 1 and 2 is based on the axis of each bus bar 1 and 2, that is, conduits 4 and 5.
Of course, the apex angles are arranged in the same direction with respect to the central axis along the longitudinal center line. For example, in the figure, the apex angle is arranged downward with respect to the axis. In addition, the T-shaped three-phase lumped bus 3 has a conductor a extending each phase bus conductor a, b, c, of the bus 1 into the T-shaped three-phase lumped bus conduit 7.
3, b, , Cs are built in, and are supported by a supporting insulator 6 covered with a cover 8 at the end thereof, and each phase conducting sakaki.

, b3, and Cs are connected to the extended ends of the phase bus guides 2, b2, and C2 of the bus bar 2, respectively. In this case, the bus conductor for three phases, C
o extends on its axis and is connected to the corresponding conductors H and C3, and the bus conductor A2 for the other phase covers the space on the base side of the bus conductors arranged at each vertex of the isosceles right triangle. Using this, transpose as shown and connect to the corresponding conductor A3. However, such a structure has problems in terms of manufacturing difficulty and economy in terms of keeping the mechanical strength of the sealed pipe line, which is treated as a pressure vessel, to a required value when increasing the capacity of the bus bar.

That is, if the phase conductors in the conduit of each bus bar are arranged at the vertices of the isosceles right triangle as described above, the diameter of the sealed conduit becomes large.

In addition, in order to provide pressure-resistant strength as a pressure vessel, the wall thickness must be increased according to the size of the pipe diameter, resulting in an increase in material costs. In particular, in the case of the T-shaped three-phase all-in-one conduit 7 having the same diameter, stress is concentrated at the saddle portion A, so the length of the pipe must be sufficiently long relative to the pipe diameter and extra reinforcement must be provided. Therefore, there were problems that needed to be solved, such as the work being complicated, troublesome, and expensive. The present invention has been made in consideration of the above points, and its object is to provide a closed three-phase busbar that is small, lightweight, inexpensive, and easy to manufacture.

Embodiments of the present invention will now be described with reference to FIGS. 2a and 2b.

That is, 11 is a three-phase all-in-one bus (hereinafter abbreviated as bus), and 12 is a branched three-phase all-in-one bus (hereinafter abbreviated as bus) arranged at right angles to the axis of bus 11. The bus bar 11 accommodates each phase bus bar conductor Al, bl, and cl in a three-phase batch sealed conduit line 13 (hereinafter abbreviated as conduit line).
In addition, the bus bar 12 connects each phase bus bar, , B2, and C2 to the three-phase sealed conduit 14 (hereinafter abbreviated as the conduit).
The axes of the conductors 3 and 14 are orthogonal to each other, and the apex angles of the conductors are arranged in the same direction with respect to the respective axes. That is, for example, in the illustration, the apex angles are located below the respective axes. Such a conductor arrangement takes an equilateral triangle arrangement among isosceles triangles, and conductors are arranged at the vertices of this equilateral triangle. Further, the axis is a central axis along the longitudinal direction of each of the pipes 13 and 14. and busbar 11,1
It is supported by support insulators 16 provided for each phase on end plates 15 provided at the ends of the conduit lines 13 and 14, respectively. In addition, Fig. 2 d is a triangular projection viewed from the direction of arrow D in Fig. 2 a, and shows that the conductor of the bus bar 11 is the vertex of the equilateral triangle arrangement located on the lower side. ing. In addition, Figure 2e is a triangular projection viewed from the direction of arrow E in Figure 2a, and shows that the conductor ■ of the busbar 12 is the vertex of the equilateral triangle arrangement located on the lower side. 2d and 2e are the conductors Bl, h, respectively.
It shows an equilateral triangle arrangement with the apex facing downward.
That is, FIGS. 2d and 2e both show conductor arrangements in which the vertices of an equilateral triangle are directed downward. Also, 17,
Reference numerals 18 and 19 designate single-phase connection busbars having a sealed structure that connect end portions of the busbars 11 and 12 for each phase.

The single-phase connection bus 17 is connected to a small diameter L-shaped conduit 20 installed between the end faces of both bus bars 11 and 12 in line with the conductor axes of the bus conductors Al and a2 of both bus bars 11 and 12, respectively.
The L-shaped connecting conductor A3 that connects between the two is housed.

Furthermore, the single-phase connection bus 18 accommodates L-shaped connection conductors in the L-shaped conduit 21, and the single-phase connection bus 19 accommodates L-shaped connection conductors C3 in the L-shaped conduit 22. Similarly to the phase connection bus 17, the bus conductors Bl and b2 are connected by an L-shaped connection conductor B3 in line with the conductor axes of the corresponding conductors of both bus bars 11 and 12, respectively, and the bus conductors Cl and C2 are connected in an L-shape. They are respectively connected by conductor C3. Although not shown in the drawings, each of these connecting portions is connected using a contact that is detachable in the direction of the conductor axis. L-shaped conduit 20, 21,
Each of the pipes 22 is constructed by connecting pipes that can be divided into several parts, and is attached by fastening its both end faces to the end faces of the busbars 11 and 12.

Also, L-shaped connection guide spiders housed within the L-shaped conduits 20, 21, 22. , B3, and C3 are reliably insulated and supported by the support insulator 16 at the conduit connection part and the support insulator 16 located in the middle of the L-shaped conduit. In this way, the bus bar 11 and each phase bus conductor of the bus bar 12 having an axis perpendicular to the bare wire of the bus bar 11 are connected to each bus bar 11, 12 by the single-phase connection bus bars 17, 18, 19 between the ends of the bus bar 11, 12. The conductors are connected in an L-shape on the conductor axis.

Another embodiment of the invention will now be described with reference to FIGS. 3a to 3c.

That is, a closed type three-phase bus bar is shown in which a three-phase bus bar extending in one direction is provided with a three-phase bus bar branching in a direction perpendicular to the bus bar. 101A and 101B are three-phase integrated busbars (hereinafter abbreviated as busbars) which are arranged on the same axis and whose end faces face each other at intervals.

Reference numeral 102 denotes a three-phase integrated bus (hereinafter abbreviated as bus) which serves as a branch bus and is arranged between bus bars 101A and 101B with an axis perpendicular to the axis thereof. The bus bar 101A accommodates each phase bus guide, , Bl, and Cl in a three-phase all-in-one conduit 103A (hereinafter abbreviated as conduit), and the bus bar 101B houses three-phase all-in-one conduit 103B (hereinafter abbreviated as conduit). ), house each phase bus conductor a/, b1', C1'' in
Further, the bus bar 102 accommodates each phase bus bar conductor A2, b2, c2 in a three-phase all-in-one conduit 104 (hereinafter abbreviated as conduit).

The respective axes of the conduits 103B and 104 are orthogonal to each other, and the busbar conductors a1'', Kg'', C1'' and A2, b2, c2 are arranged in a bilaterally symmetric isosceles triangle, that is, for example, arranged at the vertices of an equilateral triangle. The apexes are arranged in the same direction with respect to the axes of the conduits 103B and 104. In other words, in the illustration, the apex angles of the equilateral triangle are arranged below the axes. , B2″, C1″ and A2
, b2, c2 are supported by supporting insulators 16 provided for each phase on an end plate 15 provided on the end surface of the conduit. 107,
Reference numerals 108 and 109 denote single-phase connection buses having a sealed structure that connect the ends of the buses 101A, 101B and 102 for each phase.

The single-phase connection bus 107 includes each bus 101A, 101B, and 10.
A connecting conductor that connects conductors Al, al'', A2 in a small diameter T-shaped conduit 110 installed between the end faces of bus bars 101A, 101B, 102 in alignment with the conductor axes of bus conductors Al, al'', A2 of No. 2. Stores A4.

A part of the conduit 110 of the single-phase connection bus 107 is formed into a portal shape as shown in the figure, and is installed between the end faces of the busbars 101A, 101B, and 102 so as to straddle the single-phase connection bus 109. The single-phase connection bus 108 accommodates the connection conductor B4 in the T-shaped conduit 111, and connects the bus conductors B1, bl'', and B2 along the conductor axes of the conductors.

Further, the single-phase connection bus 109 accommodates a connection conductor C4 in a T-shaped conduit 112, and connects the bus conductors Cl, Cl, and C2 on the conductor axis of the bus conductor. In addition, each conduit 110,
Reference numerals 111 and 112 have a structure in which conduits that can be divided into several parts are connected, and each connection part is provided with a support insulator 16 that holds the connection pipes, B4, and C4, as in the embodiment of the present invention described above. . In this way, the phase conductors of the buses 101A, 101B and the bus 102 are connected in a T-shape for each phase by the single-phase connection buses 107, 108, 109 between the end faces of the buses. As explained above, according to the sealed three-phase busbar of the present invention, the axes in the conduits of each busbar are arranged orthogonal to each other, and the axes on the same side of the respective axes are arranged in each conduit. Arrange each conductor in an isosceles triangle arrangement with the apex angle at .

In other words, the conductors of each phase are placed below the axes of the apex angles of a symmetrical isosceles triangle, for example, the equilateral triangle in the illustration, and the conductors of each phase are placed at each vertex of the equilateral triangle. The conductor arrangement has a balanced insulation distance between phases, which improves the insulation strength, improves the space factor, and reduces the pipe diameter, resulting in a smaller size. In addition, instead of using an expensive three-phase T-shaped branch pipe with the same diameter as the pipe as in the past, small-diameter pipes are used for each phase at the branched connections of the busbar. It is easy and inexpensive to manufacture, has high pressure resistance as a pressure vessel, is robust, and can easily be used to increase the capacity of the bus bar. In addition, when connecting a bus bar end and a branched bus bar end by a single-phase connecting bus bar for each phase in an L-shape, the single-phase connecting bus bar is connected between the bus bar ends on the extended axis of the conductor, In addition, when the busbar ends that are branched between the busbar ends on the same axis are connected to each phase in a T-shape by a single-phase connection busbar, at least two of the single-phase connection buses of each phase are connected to the busbar.・
Since the connection is made between the wire ends on the extended axis of the conductor, the length of the conduit between the connection parts is shortened and the space is reduced.
The arrangement of the busbars is not restricted by these single-phase connection busbars, and the degree of freedom in the configuration of the busbars is improved.

[Brief explanation of the drawing]

Figure 1a is a plan view of a conventional sealed three-phase busbar, Figure 1b is a sectional view taken along the line I-1 in Figure a, Figure 1a is a view taken in the direction of B in Figure b, and Figure 2a is a is a plan view of the sealed three-phase bus of the present invention, the second
Figure b is a side view of Figure A at arrow C, Figure 2 c is a sectional view taken along the line ■-■ in Figure A, Figure 2 d is a view viewed from arrow D in Figure A, Figure 2 e is d.
(7) A view taken along the arrow E, FIG. 3 a is a plan view showing another embodiment of the present invention, FIG. 3 b is a sectional view taken along the line ■-■ of FIG. ■A cross-sectional view taken along the line. 11, 12, 101A, 101B, 102...Three-phase lumped bus bar, 13, 14, 103A, 103B, 104...
・Three-phase one-piece sealed pipeline, 17, 18, 19, 107
,108,109...Single-phase connection bus, 20,21,
22...L-shaped conduit, Al, bl9cl; a1
'9b159c1'; A29b29c2 bodies, A3, b3
, C3...L-shaped connection conductor, A4, b4, c4
...Connecting conductor.

Claims (1)

[Scope of Claims] 1. In two three-phase lump-type sealed pipes arranged horizontally with their axes orthogonal to each other, symmetrical and identical isosceles with apex angles in the same direction with respect to the axes. Both three-phase bus conductors placed at each vertex of the triangle are housed, and an insulating gas is filled in to form a two-three-phase lumped bus, and each phase of the two three-phase bus conductors is connected for each phase. A sealed three-phase bus, characterized in that the branched conductors are housed in a small conduit and connected by a single-phase connection bus made by filling insulating gas. 2 Three-phase busbar conductors are placed at each vertex of an equilateral triangle in the double-pack type sealed conduit, and one-phase bus conductors of the three phases are arranged at the apex angles of the bus conductors of each phase in the double-pack type sealed pipe. Among the bus conductors and other two-phase bus conductors, the first phase bus conductors are each connected by a T-shaped single-phase connection bus, and the other second
2. The sealed three-phase bus according to claim 1, wherein the phase bus conductors are connected via a gate-shaped single-phase connection bus that straddles the first phase.