CN2449399Y

CN2449399Y - Double-layer stress-dispersed cross linking cable end

Info

Publication number: CN2449399Y
Application number: CN 00255452
Authority: CN
Inventors: 佘晓峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-09-29
Filing date: 2000-09-29
Publication date: 2001-09-19
Anticipated expiration: 2010-09-29

Abstract

The utility model relates to a double-layer stress-dispersed crosslinked cable terminal end, which presents a shape similar to a pipe. An outer layer of the cable end is provided with an insulating layer with partial spacing ring-shaped convex rain skirts, the central part is a hollow pipe for storing core wires, and the inner part of the insulating layer is orderly compounded with a dielectric layer and a stressed layer from outside to inside. The utility model is suitable for indoor and outdoor end joints of 10KV to 35KV crosslinked cables. The unique structure of double stress dispersion layers enables the products to have the advantages of good electric field dispersivity, good pressure resistance, long service life, insulation materials of silicon rubber, etc. saving, low accuracy requirement of installation size, etc., therefore, the utility model is an ideal and novel crosslinked cable terminal end.

Description

Double-layer stress decentralized crosslinking cable terminal

The invention relates to a kind of power cable connector, is suitable for indoor, outdoor terminal application at the crosslinked cable of 10-35 kilovolt.

Cable end is concentrated for the anti-back electric field that connects with transformer, controller switching equipment, when branch equipment is connected, often need to peel off oversheath, inner sheath etc., produces high-voltage breakdown and flashover, and the electric field of cable terminal is disperseed, and insulation property etc. have a series of requirements.Prior art is as mold insert with similar trumpet-shaped stress cone, the compound layer insulating in outside, the direct notes rubbers (moulding) that the outer surface of this insulating barrier has are protruding " the rain skirt " of ring-type at interval, to increase outer creepage distance, reduce outer creepage, have plenty of the smooth outer surface of insulating barrier own, outside its smooth outer surface, put " rain skirt " layer again.Therefore, electricity circle be referred to as " rain skirt " can with the insulating barrier one, also can make separately, be enclosed within outside the insulating barrier, this combined stress awl crosslinked cable terminals, make full use of the bell-mouthed geometry of its loudspeaker and disperse electric field, remarkable to the electric field dispersion effect that concentrate the screen end, but the electric field dispersion effect that this tubaeform stress cone is peeled off the place to whole section screen is unsatisfactory.For this reason, also have in the prior art and a kind ofly need not make mold insert by horn-like stress cone, use the dielectric layer of tubulose instead and make mold insert, the compound layer insulating in outside, " rain skirt " disjunctor or split are outside insulating barrier, the advantage of this compound crosslinked cable terminals is that the electric field to the whole section shielding place of peeling off has good dispersion effect, but its weak point is not as good as the former to the electric field dispersion effect that concentrates on the screen end.The terminals of two kinds of complex method gained have his own strong points, and shortage is also respectively arranged, and are difficult to make the best of both worlds.As seen, either-or structure in the prior art has caused either-or electric field dispersion effect.These two kinds of terminals all only come dispersive stress (electric field) by one deck structure, on the whole, all exist stress to disperse not enough shortcoming.

The task of the invention is that the structure with both compatibilities realizes the electric field dispersion effect that makes the best of both worlds promptly disperseing electric field with double-layer structure.By retrieval, still do not have the report of finding this type of imagination at present, do not see the appearance of this series products yet.

The method of finishing above-mentioned task is: integral body is made the class tube, and one section rain skirt that circular projection at interval should be arranged is arranged in its outermost insulating barrier, when drenching to solve rainwater, increases outer creepage distance, reduces outer creepage problem.This rain skirt section can be made one with whole insulating barrier, can insulating barrier be tubular also, and the outside puts the split type of rain skirt, and the central part of terminals is blank pipes, and with logical heart yearn, ecto-entad is compounded with dielectric layer and stressor layers successively in the insulating barrier.The horn mouth of stressor layers is inside.

For making with easy for installation, the rain skirt can be made independent shell-like; Terminals are not with in the rain skirt section and are compounded with dielectric layer and stressor layers; The length of dielectric layer surpasses the length of stressor layers.

Accompanying drawing is the structural representation of this programme.

With reference to accompanying drawing, come in conjunction with the embodiments further to illustrate the invention: with different manufacture crafts and mounting means, be divided into prefabricated terminals, thermal shrinkage type terminals, cold-contraction type terminals in the industry, this programme all is suitable for above-mentioned three classes.Insulating barrier 2 usefulness silicon rubber, ethylene-propylene rubber, insulation polyethylene are made, and add raw materials such as zinc oxide, brium carbonate in dielectric layer 3 usefulness rubber or the insulation polyethylene, and dielectric constant is 8-30; Stressor layers 4 is with adding carbon black and metal dust etc. in rubber or the plastics, and resistivity is 10 ²-10 ⁶Ohmcm.They have the semiconductive performance, no matter select silicon rubber, ethylene-propylene rubber for use, and the polyethylene that still insulate is made base-material, then require the base-material of insulating barrier, dielectric layer, stressor layers necessary consistent.Each layer stressor layers 4 before this annotated rubbers (moulding) by mould separately and made, and again it is enclosed within dielectric layer 3 moulds as mold insert and annotates rubber (moulding) one-tenth double-decker again, is mounted on as mold insert with double-decker and annotates rubber (moulding) insulating barrier 2 on the terminals mould and realize.Generally require the internal diameter 13-45 (mm of unit, down together) of blank pipe 5, stressor layers 4 is horn-like, be referred to as stress cone, horn mouth is inside, stress cone wall thickness 0.5-4, length 40-100, about 20 ° of horn mouth inclination angle, the inside and outside wall of stress cone requires smooth, and particularly two ends answer circular arc to connect especially, smooth transition is with effective dispersion electric field.The thickness 2-10 of dielectric layer 3, the total length 60-500 of terminals, because of product seriation, the zone of reasonableness of each layer size is also scalable, more than is that industry technical staff is familiar with.

This programme is with dielectric layer 3 and stressor layers 4 compatibilities, be combined with each other, significant double-layer stress dispersion effect is arranged, from technology, all be feasible in theory, no matter product is the concentrated electric field of cable shield end after tested, still whole section screen peeled off the electric field at place, dispersion effect is all very good, and can reduce the thickness of insulating barrier, and cost economizes in raw materials.

It is good that these terminals have the electric field dispersive property compared to existing technology, and anti-(electricity) pressure property is good, The advantages such as long service life can be saved the insulating layer material cost, and the installation dimension required precision is low.

Claims

1, a kind of double-layer stress decentralized crosslinking cable terminal, integral body is the class tube, its outermost layer is the insulating barrier (2) that has the protruding rain skirt (1) of part interval ring-type, central part is characterized in that for the blank pipe (5) of logical heart yearn the interior ecto-entad of insulating barrier (2) is compounded with dielectric layer (3) and the inside stressor layers (4) of horn mouth successively.

2, terminals as claimed in claim 1 is characterized in that said rain skirt (1) is the outer jacket layer of insulating barrier (2).

3, terminals as claimed in claim 1 is characterized in that the dielectric layer (3) in said being compounded in is not with rain skirt section with stressor layers (4) substantially at these terminals.

4,, it is characterized in that the length of the length of dielectric layer (3) greater than stressor layers (4) as claim 1 or 3 described terminals.