CN201174264Y

CN201174264Y - Tubular dielectric bus

Info

Publication number: CN201174264Y
Application number: CNU2008200192726U
Authority: CN
Inventors: 孙国歧; 李培国
Original assignee: Shandong Chilintec Electric Equipment Manufacture Co Ltd
Current assignee: Shandong Deyou Electric Co., Ltd.
Priority date: 2008-03-25
Filing date: 2008-03-25
Publication date: 2008-12-31
Anticipated expiration: 2018-03-25

Abstract

The utility model discloses a tubular isolate bus, comprising a wire connecting terminal, a tubular conductor, a semiconductive buffer layer, an isolating layer, an electrical stress eliminating layer, an outer sheath and so on. The tubular isolate bus is mainly characterized in that the outside of the tubular conductor is coated with the semiconductive buffer layer the outside of which is provided with the main isolating layer without any capacitance plate; and the electrical stress eliminating layer is arranged outside the main isolating layer to forcedly distribute the isolating surface potential uniformly. The tubular isolate bus has a simple and reasonable structure, the main isolating material can be selected in a wind range, and the tubular isolate bus is suitable for mechanized mass production and improves the safety and reliability.

Description

Tubular isolated bus

Technical field

The utility model relates to a kind of isolated bus, particularly tubular shape conductor coated outside SOLID ORGANIC insulating material, be used for the tubular isolated bus of transforming plant main transformer depressor low-pressure side.

Background technology

At present, in the change of electric power system, power distribution station, the bus that the main transformer low-pressure side is used mainly is a rectangular bus bar, employing be multi-slice rectangle conductor.Increasing along with transforming plant main transformer depressor capacity, transformer low voltage side bus rated current constantly increases (having surpassed 3000A under a lot of situations), rectangular bus bar has been difficult to satisfy bus heating and electrodynamic requirement technically with on the structure because its skin effect coefficient is big, bending strength is low.In order to address the above problem, the isolated bus (capacitor type insulating pipe bus) of tubular conductor had appearred adopting in recent years, and this isolated bus carrying object is tubular conductor, and its skin effect coefficient is little, mechanical strength is high, has solved the deficiency of rectangular bus bar.The CN 2864924Y utility model patent of bulletin disclosed a kind of like this insulated tube bus such as on January 31st, 2007, this type insulated tube bus is made up of tubular hollow conductor, insulating barrier, oversheath etc., its skin effect coefficient is little, current-carring characteristic good, be primarily characterized in that laying the capacitor voltage equalizing screen in the insulating barrier between tubular conductor and the oversheath forces all pressures, efficiently solve tubular isolated bus along face voltage problem pockety, improved the reliability of bussed supply.Yet, structurally also there are many weak points in this type insulated tube bus, such as: one, its insulating barrier directly is coated on the tubular conductor, the centre does not have elastic cord breaker, because the difference of thermal expansion coefficients of conductor and insulating barrier is very big, the stress that in use expands with heat and contract with cold causes insulating barrier cracked or cause that gap causes discharge breakdown between metal level and insulating barrier; Two, owing to will alternately twine main insulation and lay capacitance plate, complex process is unfavorable for mechanization large-scale production to this utility model in realization.

Summary of the invention

The purpose of this utility model is to overcome the shortcoming of above prior art, provide a kind of structure more advantages of simple, move safety and reliability, be suitable for a kind of novel tubular isolated bus of mechanization large-scale production.

The technical scheme that its technical problem that solves the utility model adopts is: a kind of novel tubular isolated bus, comprise binding post, tubular conductor, end seal layer, semiconductive transition buffer layer, insulating barrier, electric stress eliminating layer, earth electrode, external sheath layer etc., it is characterized in that laying between tubular conductor and the insulating barrier elasticity semiconductive transition buffer layer; Do not lay capacitance plate in the insulating barrier, the main insulation material is unrestricted, both can be built up membrane (such as polytetrafluoroethylene film) insulation, also the solid insulation that can be made up of thermosetting resin (such as epoxy resin) and other filler; Main insulation both can realize with the winding method, also can realize by casting, made simple and convenient; Its insulating surface Electric Field Distribution is pind down by the electric stress eliminating layer, described electric stress eliminating layer can be a stress cone, it also can be stress tube, it is made by the solid insulating material of high-k (relative dielectric constant ε r ≮ 4), and with the earth electrode close-coupled, the axial electric capacity that it is bigger forces the insulating surface Potential distribution to be tending towards even.Because adopt said structure, the structure of the utility model insulated tube bus is advantages of simple more, the main insulation material is selected wide, and manufacture craft is simplified greatly, is suitable for mechanization large-scale production; The utlity model has the semi-conductive buffer layer of offsetting the stress that expands with heat and contract with cold, avoid that gap causes discharge breakdown between insulating barrier cracked or metal tube and insulating barrier, and has the uniform electric stress eliminating layer of the insulating surface of forcing Electric Field Distribution, effectively improved the anti-soil lightning and pressed, made its operation more safe and reliable.

The beneficial effects of the utility model are that rational in infrastructure, the main insulation material is selected wide, is suitable for mechanization large-scale production, and has improved fail safe and reliability.

Description of drawings

Below in conjunction with accompanying drawing the utility model is further specified.

Accompanying drawing is the tubular isolated bus schematic diagram of the utility model.

In the accompanying drawing, 1. binding post, 2. tubular conductor, 3. end seal layer, 4. semiconductive transition buffer layer, 5. insulating barrier, 6. electric stress eliminating layer, 7. earth electrode layer, 8. external sheath layer, 9. silicon rubber full skirt.

Embodiment

Embodiment of the present utility model is as shown in drawings: several flat binding posts (1) firmly are connected on the tubular conductor (2) by welding or alternate manner (such as being threaded etc.), and this tubular conductor is cast copper pipe (comprising copper alloy tube) or aluminum pipe (comprising aluminium-alloy pipe); Coat one deck semiconductive transition buffer layer (4) tightly in the outside of tubular conductor (2), this layer has elasticity, is used to offset the stress that expands with heat and contract with cold between tubular conductor (2) and the insulating barrier (5); The outside of semiconductive transition electricity resilient coating (4) is insulating barrier (5), and this insulating barrier both can be the built up membrane insulation, also can be insulative thermosetting resin; Insulating barrier (5) both can be realized with the winding method, also can realize with casting; Insulating barrier (5) outside is with electric stress eliminating layer (6) and earth electrode layer (7), electric stress eliminating layer (6) can be a stress cone, it also can be stress tube, electric stress eliminating layer (6) is made by solid insulating material high-k, contractile (such as silicon rubber), it can radially shrink, and tightly is rolled in after the contraction on the insulating barrier (5); Earth electrode layer (7) is extremely thin conduction of thickness or semi-conductive layer; The afterbody of electric stress eliminating layer (6) has conduction or semiconductive part, and this conduction or semiconductive part closely contact with earth electrode (7); External sheath layer (8) is enclosed within outside electric stress eliminating layer (6) and the earth electrode (7), and end seal layer (3) and external sheath layer (8) are bonding to be sealed in above-mentioned semiconductive transition buffer layer (4), insulating barrier (5), electric stress eliminating layer (6) and earth electrode (7) on the tubular conductor; External sheath layer (8) can be (but being not limited to) composite material collapsible tube or composite glass steel pipe; For the heavier occasion of environment filth, can be outside external sheath layer (8) suit silicon rubber full skirt (9), increase creepage distance.

As further improvement of the utility model, external sheath layer (8) can be divided into plurality of sections, electric stress eliminating layer (6) is combined into one with the termination section of external sheath layer (8), can also full skirt (9) also be combined into one with it again; This complex one end and end seal layer (3) are bonding, the bonding formation sealing of the remainder (interlude) of the other end and external sheath layer (8).

Tubular conductor of the present utility model (2) not only can also can curve it different angles as required for straight; When tubular conductor (2) was the shape of bending, the utility model isolated bus also was crooked.

Claims

1, a kind of tubular isolated bus, comprise binding post, tubular conductor, the end seal layer, semiconductive transition buffer layer, insulating barrier, the electric stress eliminating layer, the earth electrode layer, external sheath layer, it is characterized in that tubular conductor two ends connect binding post, the outside of tubular conductor coats semiconductive transition buffer layer, semiconductive transition buffer layer is outward an insulating barrier, insulating barrier is outward electric stress eliminating layer and earth electrode layer, the two ends of external sheath layer and end seal layer are bonding, and external sheath layer and end seal layer are with semiconductive transition buffer layer, insulating barrier, electric stress eliminating layer and earth electrode layer are sealed on the tubular conductor.

2, tubular isolated bus according to claim 1 is characterized in that the bonding silicon rubber full skirt of end portion of external sheath layer.

3, tubular isolated bus according to claim 1, it is characterized in that external sheath layer is divided into plurality of sections, the termination section of electric stress eliminating layer and external sheath layer is combined into one, and this complex one end and end seal layer are bonding, the bonding formation sealing of the interlude of the other end and external sheath layer.

4, tubular isolated bus according to claim 1, it is characterized in that external sheath layer is divided into plurality of sections, the termination section and the full skirt of electric stress eliminating layer and external sheath layer are combined into one, and this complex one end and end seal layer are bonding, the bonding formation sealing of the interlude of the other end and external sheath layer.

5, tubular isolated bus according to claim 1 is characterized in that its profile is crooked.

6, tubular isolated bus according to claim 1 is characterized in that binding post is a multi-disc square-section conductor, and these square-section conductor arrangement become regular polygon.

7, tubular isolated bus according to claim 1, the material that it is characterized in that semiconductive transition buffer layer is the rubber that is added with metal or conductive carbon black.

8, tubular isolated bus according to claim 1, the material that it is characterized in that insulating barrier is built up membrane or thermosetting resin.

9, tubular isolated bus according to claim 1 is characterized in that the relative dielectric constant of electric stress eliminating layer is not less than 4.

10, tubular isolated bus according to claim 1 is characterized in that oversheath is compound collapsible tube or composite glass steel pipe.