JPH10164736A - Bus-bar supporting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form gaps among phases and to increase the dielectric strength, and to reduce the size of a bus-bar supporting device by forming grooves in surfaces being opposed to each other of a pair of insulating supporting boards and interposing bus-bars between, and providing protrusions on the opposite side surfaces to the grooves of these insulating supporting boards. SOLUTION: In respective corresponding surfaces of insulating supporting boards 2 each composed of a pair of insulating supporting boards 2A and 2B corresponding to each other, grooves 11 and insulated grooves 12 for putting bus-bars in are formed respectively, and besides rugged folded parts 13 surrounding these grooves 11, 12 are formed. And fitting parts 14 are provided on the upper and lower sides interposing the folded parts 13, and protrusions 16 are formed on the boundary surface sides of the insulating supporting boards 2 for supporting adjoining bus-bars 3 of different phases, and the insulating supporting boards 2 of individual phases are united by the aid of these protrusions 16. Consequently, it becomes possible to provide gaps among individual phases and increase the dielectric strength, and to reduce the size of an enclosed bus-bar box 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bus support device for arranging a bus connecting a transformer such as a substation and a distribution board and an insulating support plate supporting the bus.

[0002]

2. Description of the Related Art A closed bus is used to connect devices such as a closed switchboard and a transformer with a main circuit bus. The closing bus is generally constituted by a main circuit bus having a necessary current-carrying capacity therein, an insulator for insulating and supporting the bus, and a jacket for closing the insulator. The cross-sectional area and shape of the main circuit bus are determined by the supplied current, but a flat busbar is generally used due to a rise in temperature and ease of manufacture.
Insulating supports are provided between the bus bar and the ground metal to have the required mechanical strength and to maintain insulation from the ground.
In addition, the outer jacket is configured as a closed bus box by closing the main circuit bus and the insulating support with a ground metal, including a ventilation device, an inspection cover, and the like. Incidentally, Japanese Patent Application Laid-Open No. S51-40590 can be cited as this type of busbar supporting device.

[0003]

Conventionally, the closed bus is 600
In the case of the V class or lower, since the current is mainly applied, a flat insulating plate is sufficient for supporting the bus, but as the voltage becomes higher, electrical insulation is required and the creepage distance is required. As a result, the size of the supporting insulator and the like becomes large, and the size of the closed bus (bus duct) also becomes large. In addition, the support insulator that supports the main circuit bus is a structure that supports the bus at the head of the insulator.Because a bending force is applied to the insulator when a short-circuit current occurs, it is necessary to consider that the bus support interval is narrowed.
The busbar supporting device could not be avoided from being enlarged.

[0004] It is an object of the present invention to provide a busbar supporting device that is reduced in size and facilitates production.

[0005]

In order to achieve this object, a bus supporting device according to the present invention comprises a pair of insulating support plates corresponding to each other, and a groove formed on a corresponding surface of the pair of insulating support plates. A bus bar inserted into the groove of each insulating support plate, and a support member that supports between the insulating support plates and sandwiches the bus between the insulating support plates, and has a projection on the surface of the insulating support plate opposite to the groove. It is in.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 3 shows that a plurality of insulating support plates 2 are arranged at predetermined intervals along the longitudinal direction of a closed bus box within a closed bus box 1 formed by a jacket 7, and the three-phase bus 3 is supported on the insulating support plate 2. doing. The configuration of the insulating support plate 2, the bus 3, and the like arranged in the closed bus box 1 will be described with reference to FIGS. The third bus bar 3 from the left in FIG. 1, that is, the lower three buses 3 is intentionally removed to make the structure of the corresponding surface of the insulating support plate 2 easy to understand. The bus 3 in FIG. 2 is arranged in the vertical direction, but is actually arranged horizontally like the bus 3 in FIG.

The closed busbar 1 has a side plate 6 attached by welding, screws or the like between an upper supporting metal member 4 and a lower supporting metal member 5 corresponding to each other. The reference guide fittings 8A and 8B are attached to the left ends of the upper support fitting 4 and the lower support fitting 5, respectively. A jacket 7, for example, a steel plate, an aluminum plate, or the like is attached so as to surround the support metal fittings 4, 5 and both side plates 6, and has a substantially rectangular cross section. Insulation support plate 2 in closed busbar
And a three-phase bus 3 supported by the bus.
The closed busbar 1 in the longitudinal direction is covered with a cover 7A at a predetermined interval.
If the cover 7A is removed and the cover 7A is removed, the inside insulating support plate 2, busbar 3 and the like can be maintained and inspected.

The insulating support plate 2 includes a first insulating support plate 2A and a second insulating support plate 2B.
A groove 11 for accommodating the bus bar 3 and an insulating groove 12 are formed on the corresponding surface 10 of B. One-side insulating support plate 2A and other-side insulating support plate 2B are arranged such that corresponding surfaces 10 correspond to each other. An uneven fold 13 that surrounds these grooves 11 and 12 and reaches the corresponding surface is formed, and mounting portions 14 are provided on the upper and lower sides via the fold 13. Each groove 1
A projection 16 is provided on the other surface 15 corresponding to the one-phase insulating support plate 2 and the other-phase insulating support plate 2 ′ on the side opposite to 1 and 12.

When arranging the pair of insulating support plates 2A and 2B, the other surfaces 15 of the one side insulating support plate 2A and the other side insulating support plate surface 2B opposite to the grooves 11 and 12 are arranged correspondingly. The other surfaces 15 of the two insulating support plates are connected to each other by a protrusion 16, and a gap 20 is formed between the protrusion 16 and the other surface 15 of the two insulating support plates. The protruding portion 16 is provided on each insulating support plate 2.
A and 2B are arranged diagonally.

Next, a method of assembling the closed bus box 1 will be described.

The closed busbar 1 shown in FIG. 1 is turned by 90 ° to set the upper support 4 and the lower support 5 vertically. At this time,
Side plates 6 at the upper and lower ends of the upper support 4 and the lower support 5
Is fixed with screws. Mounting holes 21A are provided at predetermined intervals from the lower reference guide fittings 8A, 8B of both support fittings 4, 5. The one-side insulating support plate 2A is disposed between the support brackets 4 and 5 in contact with the reference guide brackets 8A and 8B. At this time,
It is arranged on the corresponding surface 10 of the one-side insulating support plate 2A so as to be on the upper side, the bus bar 3 housed in the groove 11 is covered with a spacer 21 made of an elastic member, and the spacer 21 is housed in the groove 11 of the other-side insulating support plate 2B. I do.

The other surface 15 of the insulating support plate 2B is arranged so as to correspond to the other surface 15 of the insulating support plate 2B of the other phase. The left side of the other surface 15 and the right side of the other surface 15 are connected by a protrusion 16. Therefore, in a state where the gap 20 is formed between the corresponding other surfaces 15 and the inside surrounded by the projections 16, the nuts are screwed into the threaded bolts inserted into the mounting holes 21A of the mounting portion 14 and the two support fittings 4, 5. After mounting, the insulating support plates 2A and 2B are fixed to the support fittings 4 and 5, and the bus 3 is sandwiched between the insulating support plates 2A and 2B. The closed bus box 1 in the vertical state is rotated by 90 ° and used in the horizontal state of FIG.

As described above, according to the present invention, the following effects can be achieved.

[0014] The insulating support plate 2A of FIG. 1 is arranged with the paper surface A facing upward. The insulation support plate in this state is rotated once so that the paper surface A faces downward and the back surface B faces upward, and the other insulation support plate 2B is arranged so that the corresponding surfaces are arranged corresponding to each other.
Are arranged corresponding to the insulating support plate 2A, and the other-side insulating support plate 2B
A pair of insulating support plates 2A and 2B are arranged so that the paper surface A of the paper is turned upward and the back surface B is directed downward, and the corresponding surfaces 10 of FIG. 1 correspond to each other and the paper surface A faces upward. I do.
Since these insulating support plates 2A and 2B can be made of one type of insulating support plate, not only is production easy, but inventory control is also simple because only one type is required. To further facilitate production, an insulating support plate having the insulating support plate 2B with the paper surface A facing upward and the back surface B facing downward, and an insulating supporting plate having the paper surface A facing downward and the back surface B facing upward. Prepare When distinguishing the two insulating support plates, the position of the protrusion 16 can be immediately identified, so that these insulating support plates 2A, 2B
Can be assembled efficiently without mistaking the order.

[0015] That is, when assembling the insulating support plate 2, it is sufficient to assemble the projection 16 while looking at the upper side or the lower side. This serves as a mark when assembling the plurality of insulating support plates 2 </ b> A and 2 </ b> B according to the setting, which facilitates the assembly.

[0016] The reference guide bracket 8A is the reference guide 8B
The height is made lower, and the reference guide fitting 8A is arranged so as to be in contact with the end of the insulating support plate 2A, and the reference guide 8B is arranged so as to be in contact with the projection 16 of the insulating support plate 2A. It is used as a reference position when assembling the plurality of insulating support plates 2A and 2B according to the setting, without question as to which of the protrusions 16 should be disposed.

[0017] The bus 3 of one phase and the bus 3 of the other phase communicate with each other via the protrusion 16 via the air gap 20, so that the insulation distance is increased, the dielectric strength is increased by that amount, and the closed bus is increased. Box 1 can be reduced. There is an advantage that the heat transfer due to the current flowing through each bus bar to the gap 20 can be cut off and the gap 20 can be used as a cooling ventilation hole.

[0018] The insulating groove portion 11 has a difference in size and shape from the groove portion 12 of the bus bar 3 so that the bus bar 3 is not erroneously attached to the groove portion 11 and a necessary surface creepage distance is secured. Although copper or aluminum is used for the bus 3, an insulated bus with an insulating coating may be used instead of a bare bus. An elastic member spacer 21 is fitted into the bus 3 and the insulating support plates 2A and 2B. The spacer 21 prevents corona generated between the busbar 3 and the insulating support plates 2A and 2B and damage due to mechanical contact.

[0019] FIG. 3 shows these components configured as a closed bus unit. A bus bar 3 extending in the horizontal direction is supported between the insulating support plate 2A and the insulating support plate 2B, and is supported at intervals of a support span 1 according to a required electromagnetic force. An extension of the connecting portion 23 of the bus 3 to this support span 1, that is, 1 is configured as one unit. Conventionally, as shown in FIG. 4, the bus 3 is supported by the supporting insulator 31 and the supporting bracket 32, and receives an electromagnetic force due to the K dimension at the time of a short circuit, so that it becomes cantilevered and the supporting span is shortened. Although it is necessary to increase the number of supports at one place during l, in the present invention, it is sufficient to provide two insulating support plates 2 and the number of installation positions of the insulating support plates 2 can be reduced. Can be reduced.

[0020]

As described above, according to the present invention, the bus bar 3 on one phase and the bus bar 3 on the other phase are connected to each other via the projection 16 via the gap 20, so that the insulation distance to the surface along the ground becomes longer. In addition, the dielectric strength is increased, and not only can the closed bus box 1 be reduced, but also the assembling work of the insulating support plate and the like is facilitated by the projections 16.

[Brief description of the drawings]

FIG. 1 is a sectional view showing details of a bus supporting device used in FIG. 3;

FIG. 2 is a perspective view showing a part of details of a busbar supporting device used in FIG. 3;

FIG. 3 is a perspective view of a closed bus box shown as an embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a conventional bus supporting device.

[Explanation of symbols]

2, 2 ', 2A, 2B ... insulating support plate, 3 ... bus bar, 10 ...
Corresponding surfaces, 11 and 12: groove and insulating groove, 16: protrusion, 17: gap.

Claims (4)

[Claims] A pair of insulating support plates corresponding to each other, a groove formed on a corresponding surface of the pair of insulating support plates,
A bus bar inserted into the groove of each insulating support plate, and a support member that supports between the insulating support plates and sandwiches the bus between the insulating support plates, and includes a protrusion on the surface of the insulating support plate opposite to the groove. A bus supporting device, comprising: 2. A pair of insulating supporting plates corresponding to each other, a groove formed on a corresponding surface of the pair of insulating supporting plates, a bus bar inserted into a groove of each insulating supporting plate, and a space between the insulating supporting plates. A supporting member for supporting and holding the bus bar between the insulating supporting plates, wherein a projection is provided on the surface of the insulating supporting plate opposite to the groove, and the surface of the one side insulating supporting plate and the other side of the insulating supporting plate having the projecting portion are provided. A busbar supporting device, wherein the surfaces are arranged corresponding to each other, the two insulating support plate surfaces are connected by a projection, and a gap is formed between the projection and the two insulating support plate surfaces. 3. A pair of insulating support plates corresponding to each other, a groove formed on a corresponding surface of the pair of insulating support plates, a bus bar inserted into a groove of each insulating support plate, and a space between each insulating support plate. A pair of insulating support plates each having a supporting member for supporting and holding the bus bar between the insulating supporting plates, a pair of insulating supporting plates having a groove on one surface and a projecting portion on the other surface, and a pair of the insulating supporting plates having a diagonal line with the projecting portions. A busbar supporting device, wherein the busbar supporting devices are arranged so as to correspond to each other via a groove so as to come into a shape. 4. A bus bar according to claim 1, wherein a reference guide having a different height is provided on each of a pair of support fittings for supporting said insulating support plate. Support device.