CN205751568U - Cast composite shielding isolated bus - Google Patents

Abstract

The utility model discloses cast composite shielding isolated bus, including cast conductor, if being rolled in its outer dried layer insulation screen and overcoat sheath successively, each layer of insulation screen includes insulating barrier and the screen layer being sequentially connected with；Each of which layer insulation screen and cast conductor connection, the two ends outward direction of each layer of insulation screen reserves one section of identical length；Making cast conductor define step-like insulation shielding portion, the screen layer near overcoat sheath is ground shield in addition.The cast composite shielding isolated bus electrical insulation properties of this utility model is strong, insulation safety coefficient high, current-carrying capacity is big, kelvin effect is low, heat sink strip is good, temperature rise is low, mechanical strength is high, big, the anti-electric vibration resistance of allowable stress [σ] by force, not by environmental disturbances, security reliability height, novel appearance, structure concisely, install convenient, maintenance workload is few, it is little to take up room, it is adaptable to all kinds of complex site Construction Arrangement.

Description

Cast composite shielding isolated bus

Technical field

This utility model relates to composite shielding isolated bus technical field, particularly relates to cast composite shielding isolated bus And processing technology, it is possible to it is effectively improved the dielectric strength of copper pipe bus, shields electromagnetic interference, reduce in product running The eddy-current loss produced, reduces the insulating protection processing technique of a kind of novel conductive material of shelf depreciation.

Background technology

Composite shielding insulation copper pipe bus is one of vitals in electrical power trans mission/distribution system, and its exterior insulation protects power transmission and distribution System and the safety of power equipment, reliability service plays vital effect.Composite shielding insulation copper pipe bus is mainly used in All kinds of power plant, the power transmission and distribution of each electric pressure of transformer station, are to connect electromotor, and transformator and transmission & distribution electrical control equipment connect The big electrical current carriers of all kinds of large-scale powerful devices.In generating, power transmission and transformation, petrochemical industry, cement plant, steel plant, coloured Metal manufacturer, all kinds of mining industry, big machinery.Shipbuilding, the large enterprise such as papermaking and each large-scale square extensively applies.Can install At high voltage overhead, climb all kinds of complex site Construction Arrangement places such as wall, buried cable ditch, cable interlayer, cable tunnel.

Along with the development of domestic economy, the power load of each transformer station surges therewith, and system running current is increasingly Greatly, load is increasingly concentrated, and the main transformer capacity of transformer station is the most increasing, and many employing multi-disc rectangle busbars in conventional engineering Connected mode or directly use cable connect, and these need not well adapt to the working method of big electric current (more than 3000A), with Shi Yinqi added losses are big, CURRENT DISTRIBUTION is uneven, the increase of skin effect coefficient causes current capacity decline and contact heating etc. existing As more and more obvious.This technology is applied to international pro-ject for offshore company the earliest, such as MGC company of Switzerland, bpb company etc. of Germany, After introduce in domestic, but offshore company and domestic corporation have relatively big difference, offshore company's bus to use resin on product structure Integrated poured, this makes bus cost increase, and involves great expense, it is impossible to adapt to domestic market, and last domestic bus changes through technology Good so that insulating barrier the most all uses teflon oriented film to hold.

The shortcoming of isolated bus is exactly mainly the middle insulation processing connected, and the insulation of single pipe mother is all to do before dispatching from the factory Good, transition joint is exactly female for on-the-spot single pipe and the docking of single pipe mother, and does the exhausted of transition joint after having docked again Edge processes, but the humidity of surrounding and temperature are impossible to meet, even craft hold time may bring impurity into so that The electrical insulation properties of pipe mother is substantially reduced.

Utility model content

In order to overcome above-mentioned the deficiencies in the prior art, this utility model provides cast composite shielding isolated bus, for solving Certainly the problems referred to above, this product uses the method for composite shielding insulation to improve the effective rate of utilization of bus material, improves bus Mechanical strength, thus increase the span length of bus, make the real advantage such as occupation of land consumption reduction.

This utility model the technical scheme is that cast composite shielding isolated bus, including cast conductor, depends on successively If secondary its outer dried layer insulation screen and overcoat sheath that be rolled in, each layer of insulation screen include the insulating barrier that is sequentially connected with and Screen layer；Each of which layer insulation screen and cast conductor connection, be positioned at the two ends of each layer of insulation screen outward To reserved one section of identical length L；Cast conductor is made to define step-like insulation shielding portion, in addition near overcoat The screen layer of sheath is ground shield, and ground shield includes aluminium foil layer and braiding copper mesh layers；Each insulating barrier is by poly-four Fluorothene layer and the transparent heat Heat-Shrinkable Tubings containing politef composition are made.

Further, each layer insulating includes that the some layers being connected in turn outside cast conductor are teflon oriented thin Film layer, aluminium foil layer, some layers of polytetrafluoroethylene floor and the transparent heat Heat-Shrinkable Tubings containing politef composition, the most some poly-four The outer coating silicon oil of fluorothene layer.

Further, overcoat sheath is polyolefin high polymer insulating sheath.

Further, screen layer is aluminium foil layer.

Compared with prior art, the beneficial effects of the utility model are: buses of insulation tubes has a characteristic that

(1) current-carrying capacity is big

Buses of insulation tubes is hollow conductor, and surface area is big, and conductive surface electric current distribution is uniform.Therefore, isolated bus It is particularly suitable for the loop that operating current is big.

(2) kelvin effect is low, power loss is little

The skin effect coefficient of buses of insulation tubes is low, Kf≤1, and AC resistance is little, thus the power loss of bus is little.If adopting With multi-slice rectangle conductor, along with the increase of sheet number, skin effect coefficient continues to increase, and the effective-current amount of unit section declines, Between sheet and sheet, CURRENT DISTRIBUTION is uneven, and added losses strengthen, and radiating condition is poor.

(3) radiating condition is good, temperature rise is low

Buses of insulation tubes is hollow conductor, bus internal diameter air channel energy self-assembling formation hot-air convection, (the gas of indoor and outdoors Pressure reduction, energy self-assembling formation hot-air convection, radiating condition is good, thus substantially increases power supplying efficiency.

(4) allowable stress [σ] is big, and mechanical strength is high

The allowable stress of buses of insulation tubes is 4 times of rectangular bus bar, and the short circuit current that can bear is big, and mechanical strength is high, makes Obtain bus and support span increasing.In the case of 50KA short circuit current, the unsettled span of Φ 100 × 5mm isolated bus reaches 9 meters, Utilizing bus bar cupport to support, the span of bus can reach 13 meters, owing to bus span is big, can be directly entered altitude chamber and indoor limit Stream reactor or 10 KV switch cabinets connect, and decrease corresponding support insulator, bus gold utensil and civil engineering framework basis.

(5) electrical insulation properties is strong

Buses of insulation tubes uses closed shield insulation mode, and earthing of casing current potential is zero, owing to electric shield has: a. makes Electric Field Distribution is uniform；B. controlling potential and restriction electric field；C. avoid producing shelf depreciation at insulating surface；D. conduct leakage current And charging current；E. dangerous contact voltage is carried out the characteristics such as protection, therefore the insulation tubular bus electric field of this band shielding divides Cloth is uniform, and electrical insulation properties is strong.

(6) insulant heat-resistance coefficient is high

Buses of insulation tubes major insulation material uses politef, can work, have excellent in-250 DEG C～+250 DEG C Electric property and chemical stability, dielectric loss is little, fire-retardant, ageing-resistant, service life >=40 year.

(7) anti-electrical equipment vibration resistance is strong

Directly buses of insulation tubes is fixed on Steel Structure or on concrete support, cancels wall bushing and post insulator Son, has stronger shock resistance.

(8) not by environmental disturbances, the every of reliability height buses of insulation tubes is lock shield insulation mutually, internal without condensation product Raw, and eliminate extraneous moisture, the ground connection caused by dust and foreign object and phase fault, run and there is the reliable of height Property.

Utilize new technology semi-insulating, all insulation to reach to prevent the person from touching charged bus and metal object is fallen and produced on bus Raw phase fault etc..Being widely used in Practical Project, international advanced developed country is the most commonly used, China Guangdong, Guangxi, river The ground such as Soviet Union, Beijing, Tianjin, Shandong, Hunan, Jiangxi, Shanxi the most preferentially use this series products to obtain preferable effect, for becoming The safe operation in power station, raising power supply reliability, reduction loss serve positive role.

The composite shielding insulation copper pipe bus of my company's research and development uses the cold drawn copper tube of high-purity for transmission of electricity leading body, copper pipe Feature be that sectional area is big, resistivity is low, and conductivity is high, and corrosion resistance is strong, and mechanical strength is high, and these advantages are joined at power transmission Electricity application is confirmed.My company researches and develops, and the convection type composite shielding all insulation copper pipe bus of production solves change at present Power station is applied fairly common rectangular bus bar be not suitable with the big loop of operating current and rectangular bus bar self-heating, electric power Etc. factor.Composite shielding insulation copper pipe bus achieved with significant effect, the most also has good in practical engineering application Public praise.

Accompanying drawing explanation

Fig. 1 is the sectional view of an embodiment of cast composite shielding isolated bus；

Fig. 2 is the sectional view of the insulation screen of the bus of the embodiment of Fig. 1；

Wherein: wherein: 1-cast conductor, 2-insulating barrier, 3-screen layer, 4-overcoat sheath, 5-insulation screen, 6-ground connection Screen layer, 7-teflon oriented film layer, 8-aluminium foil layer, 9-polytetrafluoroethylene floor, 10-transparent heat Heat-Shrinkable Tubings, 11-silicon Oil.

Detailed description of the invention

In order to deepen understanding of the present utility model, below in conjunction with the accompanying drawings with embodiment to this utility model furtherly Bright, this embodiment is only used for explaining this utility model, does not constitute protection domain of the present utility model and limits.

As it is shown in figure 1, cast composite shielding isolated bus, including cast conductor 1, if being rolled in its outer dried layer insulation successively Screen layer 5 and overcoat sheath 4, each layer of insulation screen 5 includes insulating barrier 2 and the screen layer 3 being sequentially connected with；Each of which layer Insulation screen 5 and cast conductor 1 junction, be positioned at the two ends outward direction of each layer of insulation screen 5 reserve one section identical Length L；Cast conductor 1 is made to be internally formed step-like insulation shielding portion, in addition near the screen layer of overcoat sheath 4 3 is ground shield 6, and ground shield 6 includes aluminium foil layer or braiding copper mesh layers.Each of cast composite shielding isolated bus Insulating barrier 2 is made up of polytetrafluoroethylene floor and the transparent heat Heat-Shrinkable Tubings containing politef composition.

As in figure 2 it is shown, each layer insulating 2 of cast composite shielding isolated bus includes being connected to cast conductor 1 in turn Some strata tetrafluoroethene oriented film layer 7 outward, aluminium foil layer 8, some layers of polytetrafluoroethylene floor 9 become with containing politef The transparent heat Heat-Shrinkable Tubings 10 of part, the most some outer coating silicon oil of polytetrafluoroethylene floor 9 11.In addition overcoat sheath 4 is that polyolefin is high Polymers insulating sheath.Screen layer 3 is aluminium foil layer.

Embodiment 1

The 10KV composite shielding insulation structure of copper pipe bus and processing technology thereof be:

Step one, 20cm is respectively stayed at conductor two ends, afterwards at 2 layers of teflon oriented film of conductive surface tight enclosure.

Step 2, at the outer one layer of aluminium foil of tight enclosure of teflon oriented film.

Step 3, at aluminium foil outer wrap 4 strata tetrafluoroethene, and uniformly coating silicon oil

Step 4, at the outer sheathed transparent heat Heat-Shrinkable Tubings containing politef composition of teflon oriented film.Step Rapid one, two, three, four can be considered first insulation screen, respectively stay 5cm at each insulation screen two ends afterwards, carry out Two, the making of the 3rd, the 4th insulation screen, totally four insulation screens, contracts 2 layers in the outer reheating of the 4th insulation screen Insulating sheath also does grounding, and the most whole pipe bus just completes.

Embodiment 2

Structure and the processing technology thereof of 35KV cast composite shielding buses of insulation tubes be:

A. step one, 20cm is respectively stayed at conductor two ends, teflon oriented thin conductive surface tight enclosure 2 layers afterwards Film.

B. step 2, at the outer one layer of aluminium foil of tight enclosure of teflon oriented film.

C. step 3, at aluminium foil outer wrap 4 strata tetrafluoroethene, and uniformly coating silicon oil

D. step 4, at the outer sheathed transparent heat Heat-Shrinkable Tubings containing politef composition of teflon oriented film. E. step one, two, three, four can be considered first insulation screen, respectively stay 5cm at each insulation screen two ends afterwards, enter Row second, third, fourth, fifth, the making of the six, the 7th, the 8th insulation screen, totally eight insulation screens, Eight insulation screen outer reheating 2 layers of insulating sheaths of contracting also do grounding, and the most whole pipe bus just completes.

What embodiment of the present utility model was announced is preferred embodiment, but is not limited thereto, the common skill of this area Art personnel, easily according to above-described embodiment, understand spirit of the present utility model, and make different amplifications and change, but as long as Without departing from spirit of the present utility model, all in protection domain of the present utility model.

Claims (4)

1. cast composite shielding isolated bus, it is characterised in that: include cast conductor (1), if the dried layer being rolled in it successively outer is exhausted Edge screen layer (5) and overcoat sheath (4), the described insulation screen of each layer (5) includes insulating barrier (2) and the shielding being sequentially connected with Layer (3)；The described insulation screen of each of which layer (5) and cast conductor (1) junction, be positioned at the described insulation screen of each layer (5) two ends outward direction reserves one section of identical length L；Cast conductor (1) outside is made to define step-like insulation screen Covering portion, the screen layer (3) near overcoat sheath (4) is ground shield (6) in addition, and described ground shield (6) includes aluminum Layers of foil or braiding copper mesh layers；Each described insulating barrier (2) is by polytetrafluoroethylene floor and the pyrocondensation containing politef composition Sleeve pipe is made.

Cast composite shielding isolated bus the most according to claim 1, it is characterised in that: the described insulating barrier of each layer (2) Including being connected to outer some stratas tetrafluoroethene oriented film layer (7) of cast conductor (1), aluminium foil layer (8), some stratas in turn Tetrafluoroethene layer (9) and the transparent heat Heat-Shrinkable Tubings (10) containing politef composition, the most some described polytetrafluoroethylene floors (9) outer coating silicon oil (11).

Cast composite shielding isolated bus the most according to claim 1, it is characterised in that: described overcoat sheath (4) is poly- Olefin polymer insulating sheath.

Cast composite shielding isolated bus the most according to claim 1, it is characterised in that: described screen layer (3) is aluminium foil Layer.