WO2004055954A1 - Insulation bus system and insulation unit coupling method - Google Patents

Abstract

An insulation bus system includes T-shaped bushings each mounted on a casing of electric device arranged side by side and having an internal conductor, a plurality of bus units arranged between the adjacent T-shaped bushings and having a bus conductor whose axis lines are matched, a connection conductor movable in the direction of the axis line in the T-shaped bushings and having at its both sides connection holes attachable/detachable and slidable to/from the end of the bus conductor, an insulation plug engaged in a hole formed in the T-shaped bushing, coupling means coupling the connection conductor with the internal conductor, a flange arranged at the side of the T-shaped bushing of each bus unit, and connection means for thrusting through the flanges of the pair of bus units sandwiching the T-shaped bushing and connecting the pair of bus units via the T-shaped bushing.

Description

 Description: Insulated busbar system and method of connecting the busbar unit

 The present invention relates to an insulated bus system in which a plurality of electric devices arranged adjacent to each other are connected by an insulated bus, and a method of connecting the bus units.

—Self:

 FIG. 12 is a diagram illustrating a procedure for connecting a plurality of arranged boards 30 by an insulating bus 31 in a conventional gas insulated switchgear.

 In this example, when connecting the bus bar portion 3 3 to the incoming pusher 32 protruding from the upper surface of the board 30, a plurality of boards 30 already connected to the busbar portion 3 3 After moving the board 30 to which the bus bar 33 is to be connected to one side, the bus bar 33 is connected to the incoming pusher 33.

 In this case, for example, when it is necessary to take out the bus bar 33 of an arbitrary board 30 from a plurality of boards 30 arranged, all the boards 30 on one side are moved in one direction from the bus bar 33. In addition, there is a problem that each bus bar 33 must be disassembled from each lead-in bushing 32 when moving.

 FIG. 13 is a view for explaining another procedure for connecting a plurality of arranged boards 30 by an insulating bus 31 in a conventional gas insulated switchgear.

 In this example, the insulated busbar 31 configured by connecting the busbar portion 33 to the lead-in pusher 32 for the length of the row board in advance is attached to the upper surface of the arrayed boards 30 at a time. In this case, when it is necessary to take out an arbitrary board 30 from a plurality of arranged boards 30, there is a problem that the entire insulating bus 31 must be removed from the board 30.

Also, when the number of rows of gas-insulated switchgears is large and the length of the row is long, when installing the insulating busbar 31, it is necessary to correctly position each of the incoming pushers 3 2 with respect to each panel 30. There was also a problem that the laying work was difficult. Disclosure of the invention

 The present invention solves the above-mentioned problems, and in the case where an arbitrary casing is extracted from a juxtaposed casing, the casing is extracted without breaking other casings. It is another object of the present invention to provide an insulated bus system and a method for connecting the bus unit, in which the alignment of the axes of the bus conductors is easy when the electrical equipment is laid.

 An insulated bus system according to the present invention includes: a T-shaped pusher having an inner conductor attached to a casing of a plurality of electric devices arranged in parallel; and an axis of each bus-bar conductor between each adjacent T-shaped pusher. A plurality of bus units provided so as to coincide with each other, and are movable in the direction of the axis within the T-shaped pusher, and are moved toward and away from the ends of the bus conductors on both sides thereof. A connection conductor having a possible connection hole; an insulating plug fitted into a hole formed in the T-shaped pushing; a fastening means for fastening the connection conductor and the internal conductor; A flange provided on the T-shaped bushing side, and a pair of the busbar units passing through the flanges of each of the pair of busbar units sandwiching the T-shaped bushing and via a T-shaped bushing; It is obtained by a forming the connecting means.

 Also, in the method of connecting the bus unit of the insulated bus system according to the present invention, the connecting conductor is moved in one direction by sliding from the hole to the end of one of the bus conductors with the insulating plug opened. Then, moving the other bus unit to be connected so that the axes of the bus conductors are aligned with each other, and then sliding the bus conductors from the hole to the ends of the one and the other bus conductors. Moving the connecting conductors to connect the adjacent bus conductors together, then fastening the connecting conductors to the inner conductors with bolts, and then passing the bolts to the pair of flanges. A step of connecting a pair of busbar units through a T-type bushing by threading the nut through a nut and screwing it to a bolt, and a step of fitting an insulating plug into a hole of the T-type bushing and fixing the insulating plug to the T-type pushing. And a simplified drawing Do Description

FIG. 1 is a plan view of a gas-insulated switchgear according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view taken along the line 11-11 in FIG. 1,

 Figure 3 is a perspective view of the contact of Figure 2,

 FIG. 4 is a perspective view of a flange piece of the flange of FIG. 2,

 Fig. 5 is an exploded perspective view of the vicinity of the flange in Fig. 2,

 FIG. 6 is a perspective view of the vicinity of the flange in FIG. 2,

 FIG. 7 is a cross-sectional view of the end of the through bolt of FIG. 2,

 FIG. 8 is a cross-sectional view showing the way in which the bus unit of FIG. 2 is connected,

 FIG. 9 is a sectional view of a gas-insulated switchgear according to Embodiment 2 of the present invention.

 FIG. 10 is a perspective view of the connecting conductor of FIG. 9,

 FIG. 11 is a view of the connecting conductor of FIG. 10 viewed from one direction,

 FIG. 12 is a diagram illustrating a conventional procedure for connecting a plurality of arranged boards by an insulating bus.

 FIG. 13 is a view for explaining a procedure of another example of connecting a plurality of boards arranged in a conventional manner by an insulating bus. BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. In the embodiments, the same members, portions, or equivalent members and portions will be described with the same reference numerals.

Embodiment 1

 FIG. 1 is a plan view of an insulated bus system according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view taken along line II-111 of FIG.

The insulated busbar system of the present invention comprises a T-shaped pushing 2 having an inner conductor 2a mounted on a casing 1 of a gas-insulated switchgear which is an electric device, and a T-shaped bushing 2 adjacent to each other. And a plurality of bus units 3 provided with the axes of the bus conductors 3a coincident with each other, and movable in the axial direction within the T-shaped pushing 2 and on both sides thereof at the ends of the bus conductors 3a. A connecting conductor 4 having a connecting hole 4a which can be moved toward and away from the connecting conductor 4a, an insulating plug 5 fitted in a frusto-conical hole 2d formed in the T-shaped pushing 2, and a connecting conductor 4 6 as a fastening means for fastening the inner conductor 2a to the inner conductor 2a And a flange 8 provided on the T-shaped pushing 2 side of each busbar unit 3, and a pair of busbar units 3 sandwiching the Τ-shaped pushing 2 penetrating through the respective flanges 8 Τ And a connecting means for connecting the bus units 3 of the above.

 In the Τ-shaped pushing 2, the inner conductor 2a is included in an insulating material such as an epoxy resin, and the surface that does not contribute to the interfacial insulation is entirely covered with the sprayed metal surface 2b. A cylindrical electric field relaxation shield part 2c is connected to an end of the internal conductor 2a. The end of the internal conductor 2a penetrates through the electric field mitigation shield 2c.

 The bus unit 3 includes a bus conductor 3a, an inner conductive layer 3b covering the peripheral surface of the bus conductor 3a via a conductive adhesive, and an insulating layer 3c covering the inner conductive layer 3b. And an outer conductive layer 3d covering the insulating layer 3c. The insulating layer 3c is made of insulating rubber such as Ethylene Propylene Diene Monomer (EPDM) or silicon rubber, and both end surfaces of the insulating layer 3c are exposed to serve as an insulating interface when realizing interfacial insulation. The inner conductive layer 3b and the outer conductive layer 3d are made of conductive rubber obtained by adding graphite powder to the rubber used for the insulating layer 3c.

 The insulating plug 5 has a truncated cone shape, and includes an inner conductive layer 5a on the screw 6 side, an insulator 5b, and an outer conductive layer 5c. The insulator 5b is made of an insulating rubber such as EPDM or silicon rubber, and its peripheral side surface becomes an insulating interface when realizing interfacial insulation. The inner conductive layer 5a and the outer conductive layer 5c are made of conductive rubber obtained by adding graphite powder to the rubber used for the insulator 5b.

 The connection conductor 4 has a pair of connection holes 4a in which the ends of the bus conductor 3a can slide. A groove 4b is formed in the inner peripheral wall of the connection hole 4a. As shown in FIG. 3, a contact 7 which is an annular coil panel is attached to the groove 4b, and the connection conductor 4 and the bus conductor 3a are more reliably electrically connected by the contact 7. It is connected to the.

The pair of busbar units 3 are coaxially connected by a flange 8, a through bolt 9, and a nut 10. As shown in FIGS. 4 to 6, the flange 8 is composed of a pair of horseshoe-shaped flange pieces 11. The flange piece 1 1 has a through hole 1 la through which the bolt 9 passes, and a connection hole 1 lb And a screw hole 1 lc. The pair of flanges 8 penetrates the connection hole 1 lb, and surrounds the periphery of each of the opposing ends of the pair of busbar units 3 facing each other with bolts 11 screwed with screws 11c.

 The connecting means is composed of a through bolt 9 and a nut 10. As shown in FIG. 7, a shoulder 20 comes into contact with a step portion of the through bolt 9, and a nut 10 on the washer 20 passes through. By screwing onto the end of the bolt 9, the bus unit 3 is connected to each other via the T-shaped bushing 2, and the insulating interface of the T-shaped bushing 2 and the insulating interface of the bus unit 3 are separated by insulating grease. Is interposed between them to realize interfacial insulation.

 In this case, the joint between the bus conductor 3a and the connecting conductor 4 is covered by the radially enlarged portion A of the inner conductive layer 5a, the electric field relaxation shield portion 2c, and the inner conductive layer 3b. Is reduced or shielded.

 The insulating plug 5 is press-fitted into the hole 2d with insulating grease sandwiched between the holding plate 12 and the bolts 13 to realize interfacial insulation. At this time, the inner conductive layer 5a automatically comes into contact with the head of the screw 6, and becomes an electric field mitigation shield near the head of the screw 6 and the hole 2d of the electric field mitigation shield part 2c.

 Next, a procedure for connecting the bus unit 3 in the above-described insulated bus system will be described.

 First, in FIG. 8, with the insulating plug 5 opened, the connecting conductor 4 was moved in the direction of arrow B by manually sliding from the hole 2d to the end of one bus conductor 3a. Thereafter, the other bus unit 3 to be connected is moved in the direction of arrow C so that the axes of the bus conductors 3a to be connected are aligned. This work is performed for each bus unit 3 between the adjacent T-shaped pushings 2. At this time, the busbar unit 3 is already provided with the flange 8.

 Thereafter, the connecting conductor 4 is moved in the direction of arrow D by manually sliding the end of the other busbar conductor 3a from the hole 2d to connect the adjacent busbar conductors 3a. This work is also performed for each bus unit 3.

 Next, the connecting conductor 4 is fastened to the inner conductor 2a with the screw 6.

Next, the bolt 9 is inserted through the through hole 11a, and the nut 10 is screwed to the end of the bolt 9 via the washer 20 so that each adjacent bus unit 3 is T-shaped. Connect via Singing 2.

 Finally, an insulating plug 5 is fitted to the hole 2 d of the T-shaped bushing 2 with insulating grease, and a bolt 13 is screwed onto the upper portion of the T-shaped pushing 2 via the holding plate 12 to form an insulating plug. Fix 5 to T-shaped pushing 2.

 The operation of disconnecting the bus unit 3 in the insulated bus system may be performed in the reverse order of the above operation.

 As described above, according to the insulated bus system according to this embodiment, it is possible to move in the axial direction within the T-shaped bushing 2 and move toward and away from the ends of the bus conductor 3a on both sides, respectively. By providing the connecting conductor 4 having the slidable connecting hole 4a, when an arbitrary casing 1 is extracted from the juxtaposed casings 1, the other casings 1 can be moved without moving. One thing can be extracted.

 Also, when laying the gas insulated switchgear, by inserting the end of the bus conductor 3a into the communication hole 4a, the axes of the adjacent bus conductors 3a automatically match, and the position of the axis The alignment can be performed easily. Embodiment 2

 FIG. 9 is a cross-sectional view of a main part of the insulated bus system according to Embodiment 2 of the present invention.

 In this embodiment, the connecting conductor 21 has a C-shaped cross section in the middle as shown in FIG. 1 and FIG. 11, and the screw 6 is connected to the inner conductor of the T-shaped pushing 2. By being screwed to 2a, the connecting conductor 21 is in close contact with the end of the bus conductor 3a. Therefore, in this case, the groove 4b and the contact 7 required in the first embodiment are unnecessary.

 The connecting conductor may be composed of two members that are divided into two parts along the axial direction, or the connecting conductor has a C-shaped cross section at the intermediate portion, and the opening side is fastened with a clamp. You may make it.

In each of the first and second embodiments, the gas-insulated switchgear has been described as an electric device. However, the present invention is not limited to this, and may be disposed in a plant. It can also be applied to switchboards and insulated busbar systems for transformers. Can be. Industrial applicability

 INDUSTRIAL APPLICABILITY As described above, the present invention can be applied to an insulated bus unit in which casings of a plurality of electric devices arranged in parallel are connected by an insulating bus.

Claims

The scope of the claims 1. T-shaped pushers each having an internal conductor attached to the casing of a plurality of electric appliances arranged side by side;  A plurality of bus units provided between the adjacent T-shaped pushings such that the axes of the bus conductors are aligned with each other;  A connecting conductor movably in the direction of the axis within the T-shaped pusher and having a connecting hole slidable and slidable with respect to an end of the bus conductor on both sides thereof; An insulating plug fitted in the hole formed in the  Fastening means for fastening the connection conductor and the inner conductor,  A flange provided on the T-shaped bushing side of each of the bus units; and a pair of the bus bar units sandwiching the T-shaped bushings, each penetrating the flange of each of the bus unit, and via the T-shaped bushing. Connecting means for connecting the bus unit; and Insulated busbar system with. 2. A groove extending in the circumferential direction is formed on the inner wall surface of the connection hole, and a groove provided with a contact for electrically connecting the bus conductor and the connection conductor is provided in the groove. The insulated busbar system of claim 1. 3. The insulated busbar system according to claim 2, wherein the contact is formed by making a coil spring into an annular shape. 4. The insulated busbar system according to any one of claims 1 to 3, wherein the connecting conductor has a C-shaped cross section. 5. The insulated busbar system according to any one of claims 1 to 4, wherein the fastening means is a screw. 6. The insulated busbar system according to any one of claims 1 to 5, wherein the connecting means is a through bolt and a nut. 7. The insulating plug is fixed to a T-shaped bushing by being covered with a pressing plate and screwing a screw to the T-shaped bushing through the pressing plate. 2. The insulated busbar system according to item 1. 8. The insulated bus system according to any one of claims 1 to 7, wherein the electric device is a gas insulated switchgear. 9. A T-shaped pusher having an inner conductor attached to the casing of a plurality of electric devices arranged side by side, and the axes of the bus conductors are provided between the adjacent T-shaped pushes so as to coincide with each other. A plurality of busbar units, and a connection hole movably in the direction of the axis within the T-shaped pusher and provided on both sides thereof with connection holes capable of coming into contact with and separating from the ends of the busbar conductors. A conductor, an insulating plug fitted into a hole formed in the T-shaped pushing, a bolt fastening the connection conductor and the internal conductor through the hole, and a T-shaped pushing side of each busbar unit. A through-bolt that penetrates the provided flange and the respective flanges of the pair of busbar units sandwiching the T-shaped pushing, and connects the pair of busbar units via the T-shaped pushing; And a method of connecting the bus Yunidzuto of insulated bus system comprising a nut,  With the insulating plug opened, the connecting conductor is slid from the hole to the end of one of the bus conductors in one direction, and then the other bus unit to be connected is moved. A process of matching the axes of the bus conductors; Then, a step of sliding the connecting conductors 4 by sliding from the holes to one and the other ends of the bus conductors to connect the adjacent bus conductors, and A step of fastening the connecting conductor to the inner conductor, and then passing a bolt through the pair of flanges, passing the nut through the nut, and screwing the bolt to the bolt through the T-shaped pushing. The bus unit of Process  Fitting the insulating plug into the hole of the T-shaped bushing and fixing the insulating plug to the T-shaped bushing; A method of connecting said bus unit in an insulated bus system comprising: