CN103680685A

CN103680685A - Dry overall shield insulating tubular bus

Info

Publication number: CN103680685A
Application number: CN201310715071.5A
Authority: CN
Inventors: 余乐升
Original assignee: ZHEJIANG NAN WANG ELECTRIC Co Ltd
Current assignee: ZHEJIANG NAN WANG ELECTRIC Co Ltd
Priority date: 2013-12-20
Filing date: 2013-12-20
Publication date: 2014-03-26
Anticipated expiration: 2033-12-20
Also published as: CN103680685B

Abstract

The invention relates to the field of power generation, transmission, transformation and distribution devices of power systems, in particular to a dry overall shield insulating tubular bus which comprises a tubular conductive core. A first semi-conductive shield layer, an insulating layer, a second semi-conductive shield layer, a grounding shield layer and an outer protection layer sequentially wrap the outside of the conductive core from inside to outside, wherein the insulating layer is made of organic silicone rubber. The tubular conductive core is high in capacity and small in size, the insulating layer made of the organic silicone rubber has a fine electrical insulating property, dielectric loss, voltage resistance, arc resistance, corona resistance, volume resistivity, surface resistivity and the like of the insulating layer are among the best in insulating materials, the electrical performance of the insulating layer is less affected by temperature and frequency, and the organic silicone rubber insulating layer has excellent heat resistance and water repellency, has a certain flexibility after curing, can be bent and can meet use requirements under different conditions.

Description

Dry type full-shield insulative tubular bus

Technical field

The present invention relates to electric power system generating, transmission of electricity, become distribution devices field, particularly a kind of dry type full-shield insulative tubular bus.

Background technology

Along with China's rapid development of economy, unprecedented soaring for electricity capacity.Step down side rated current is also continuing to increase.At present, 110KV and 220KV transformer separate unit capacity reach 120MVA, and low-pressure side voltage is 6.3-13.8KV, and operating current is up to 5000A-11000A.Meanwhile, during China's separate unit capacity 125MW and following thermal power generation unit are in and close down gradually.200MW, 300MW and 600MW machine consist of main flow generating equipment, and its outlet voltage is respectively 15.75KV, 18KV and 20KV, and outlet electric current is respectively 8625A, 11320A and 19000A.Tubulose bus mainly reaches large current circuit more than 8000A with electric current, and the busbar cross-section of this shape amasss greatly, ampacity is large, bending strength is large, so using in large ampacity and large short circuit current loop.

At present, in the insulative tubular bus plant equipment processing of use, insulate and be mostly straight tube-like, the tubulose bus of making after insulating barrier can not bend.As Chinese patent < < dry-type all-insulating tubular bus > > (application number: 201010152738.1; Open day: on November 09th, 2011) disclose following technical scheme: comprise successively from inside to outside hollow contact tube, first ring epoxy resins insulating barrier, the first screen, the second epoxy resins insulation layer, secondary shielding layer, the 3rd epoxy resins insulation layer, the 3rd screen; the 3rd screen is connected with ground zero potential, forms shielding protection layer.Here adopt epoxy resin as insulating barrier, exist following not enough: 1, after epoxy resin is cured, it is hard and more crisp that epoxy resins insulation layer becomes, be easily subject to the effect of external force produce damaged and be difficult to repair again; 2, the insulating tube type busbar of being made by epoxy resin, can not bend again, for definite shape, need to process the annex that different bending angle tube type bus are used as turning, and these tubular shape conductors with angle cannot adopt plant equipment processing insulating barrier, can only adopt manual coiling insulating barrier, thereby cause product insulation quality unstable, during on-the-spot installation, select according to demand again different bending angles, it is obviously convenient not to do like this, and can not general all bending angles.

Summary of the invention

The object of the present invention is to provide a kind of dry type full-shield insulative tubular bus, good insulation preformance and can bending, meets the installation requirements under different condition.

For realizing above object; the technical solution used in the present invention is: a kind of dry type full-shield insulative tubular bus; comprise tubular guidewire battery core; conductive cores outside is coated with the first semiconductive shielding layer, insulating barrier, the second semiconductive shielding layer, ground shield, external protection from inside to outside successively, and described insulating barrier is made by organic silica gel.

Compared with prior art, there is following technique effect in the present invention: the conductive cores capacity of tubulose is large, volume is little; The insulating barrier that adopts organic silica gel to make, there is good electrical insulation capability, its dielectric loss, proof voltage, resistance to electric arc, resistance to corona, specific volume resistance and surface resistivity etc. all come out at the top in insulating material, and its electric property is subject to the impact of temperature and frequency very little, organic silica gel insulating barrier also has the water repellency of good heat resistance, excellence simultaneously, and it has certain flexibility after solidifying, can bend, can meet the user demand under different condition.

Accompanying drawing explanation

Fig. 1 is structural representation of the present invention.

Embodiment

Below in conjunction with Fig. 1, the present invention is described in further detail.

A kind of dry type full-shield insulative tubular bus; comprise tubular guidewire battery core 11; conductive cores 11 outsides are coated with the first semiconductive shielding layer 12, insulating barrier 13, the second semiconductive shielding layer 14, ground shield 20, external protection 30 from inside to outside successively, and described insulating barrier 13 is made by organic silica gel.The first semiconductive shielding layer 12 is arranged on conductive cores 11 outsides, the point discharge phenomenon that plays uniform electric field and avoid conductive cores 11 appearances to cause because of wedge angle or burr; The second semiconductive shielding layer 14 plays insulation shielding effect.The material of first and second

semiconductive shielding layer

12,14 adopts conventional setting.Main points of the present invention are: use organic silica gel as insulating barrier 13, organic silica gel is after sulfuration, and excellent electrical properties has elaborated in background technology, repeats no more here.Meanwhile, adopt organic silica gel as insulating barrier 13, also bring a significant advantage: the insulating barrier 13 after sulfuration has certain flexibility, can bend, difficultly rupture, Fragmentation Phenomena.

Conductive cores 11 can be selected copper tubular shape conductor or aluminium tubular shape conductor, also can use copper, Al bimetal multiple tube.Copper tubular shape conductor or aluminium tubular shape conductor can be selected according to rated current size, copper, the complicated a little point of Al bimetal multiple tube, it can following steps for manufacturing: copper coin, the aluminium sheet of (1) selected dimension, and the thickness of plate and width are determined by rated current size; (2) under the condition of high temperature, with roll mill to folding neat copper coin, that aluminium sheet carries out high temperature rolling is compound, copper coin, the compound level of aluminium sheet reach atom metallurgical binding state; (3) ply-metal of making is rolled into tubulose with rolling machine, piece mouth is adopted to the welding of high temperature compound welding technology, and the seamed pipe that butt welding connects carries out polishing, can make required copper, Al bimetal multiple tube.Under hot environment, the multiple tube of being made to composite tube by composite plate, its structure reaches atom metallurgical binding state, metal material stable performance, when moulding, bimetallic contact-making surface can be not separated; Than much good by the processing of inner casing tube or the outer rolling plate of pipe under simple cold conditions, the multiple tube bimetallic contact-making surface of simply processing under cold conditions is released state, or when moulding, contact-making surface is easily separated comes, the non-constant of material property of multiple tube.

As preferred version of the present invention, described the first semiconductive shielding layer 12, insulating barrier 13, the second semiconductive shielding layer 14 adopt that extruding machines are three-layer co-extruded, one-shot forming forms shielding insulation electric conductor 10 in conductive cores 11 after sulfuration.Adopt this technique, process velocity is fast, and cost is low, and owing to being that machine squeezes out, its quality also can be guaranteed; And, this one-body molded setting, make each layer affixed as a whole, the metaboly that can not slide, has reduced the partial discharge in insulating barrier, thereby has extended the useful life of insulating material, after shielding insulation electric conductor 10 machines, can bend according to on-the-spot installation requirements.

The set-up mode of ground shield 20 is various, in the present embodiment preferably: described ground shield 20 consists of copper strips, and copper strips is wrapped on shielding insulation electric conductor 10 and passes through ground connection.The mode being wound around by copper strips, meets the user demand of the shielding insulation electric conductor 10 under different bending states, in insulation atelier, the shielding insulation electric conductor 10 that meets installation requirements is wound around to copper strips, can manually be wound around also and can be wound around by machine.

More preferably, described external protection 30 is high-voltage busbar pipe formation, and high-voltage busbar pipe is set in ground shield 20 outsides by the mode of hot and cold contracting.High-voltage busbar piping adopts high-quality high polymer and environmental protection fire retarding agent, through scientific matching mechanical blending, become high polymer, formed product is by electron accelerator (4.5M) crosslinking with radiation, continuously expansion forms, the advantages such as that its product has is fire-retardant, radioresistance, softness, heat-resisting, easy to use, insulation property are reliable.Stop the short trouble that the toys such as mouse, snake cause; Prevent the corrosion of chemical substance to bus such as acid, alkali, salt; Prevent that maintainer's mistakenly entering into charged interval from causing unexpected injury.

Claims

1. a dry type full-shield insulative tubular bus; it is characterized in that: comprise tubular guidewire battery core (11); conductive cores (11) outside is coated with the first semiconductive shielding layer (12), insulating barrier (13), the second semiconductive shielding layer (14), ground shield (20), external protection (30) from inside to outside successively, and described insulating barrier (13) is made by organic silica gel.

2. dry type full-shield insulative tubular bus as claimed in claim 1, is characterized in that: described the first semiconductive shielding layer (12), insulating barrier (13), the second semiconductive shielding layer (14) adopt that extruding machine is three-layer co-extruded, one-shot forming forms shielding insulation electric conductor (10) conductive cores (11) is upper after sulfuration.

3. dry type full-shield insulative tubular bus as claimed in claim 2, is characterized in that: described ground shield (20) consists of copper strips, and copper strips is wrapped in shielding insulation electric conductor (10) and goes up and pass through ground connection.

4. dry type full-shield insulative tubular bus as claimed in claim 3, is characterized in that: described external protection (30) is high-voltage busbar pipe formation, and high-voltage busbar pipe is set in ground shield (20) outside by the mode of hot and cold contracting.

5. dry type full-shield insulative tubular bus as claimed in claim 4, is characterized in that: described conductive cores (11) is copper, aluminium tubular shape conductor.

6. dry type full-shield insulative tubular bus as claimed in claim 4, is characterized in that: described conductive cores (11) is copper, Al bimetal multiple tube.