CN2354252Y

CN2354252Y - High-tension cable terminal-end

Info

Publication number: CN2354252Y
Application number: CN 98218242
Authority: CN
Inventors: 黄维枢
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-08-17
Filing date: 1998-08-17
Publication date: 1999-12-15
Anticipated expiration: 2008-08-17

Abstract

The utility model relates to a novel high-tension cable terminal head, which comprises a wire connecting terminal, a guide core, an insulating layer, a capacitive screen layer, an outer sheath, an umbrella apron and a ground wire, wherein, an equipotential body for connecting the guide core and a first metal capacitive screen is a conductive body with definite preformed length. The last metal capacitive screen at the root of the cable terminal head is fastened and connected with a semi-conductive shielding layer and a metal grounding shielding layer; the ground wire is firmly led out from the metal grounding shielding layer. The cable terminal head has no oil and no porcelain. The capacitive screen layer fixed along an axial direction enforces voltage to be uniformly distributed; the flashover voltage and the breakdown voltage of the cable head are enhanced. The utility model has good performance of aging prevention, ultraviolet ray resistance and pollution flashover prevention.

Description

A kind of novel high-pressure cable terminal

The utility model belongs to the High-Voltage Electrical Appliances field, is specifically related to a kind of novel high-pressure cable terminal.

At present, the crosslinked polyethylene hv cable termination head of home and abroad 66kV and above electric pressure is oil-filled insulator cable end.Promptly, refill insulator, be full of silicone oil or other dielectric after the sealing at cable insulation overcoat upper stress awl.The easy seepage of these terminals, not only contaminated environment also is unfavorable for fire prevention, explosion-proof.Deterioration along with environment, pollution flashover accident also often has generation, depend merely on the increase creep distance and can not solve the pollution flashover problem, and this cable terminal volume is big, Heavy Weight, and price is expensive, state's productive rate is low, major part needs import, and homemade 110kV cable terminal needs 50,000 yuan approximately, import need ten thousand yuan of 8-10 approximately.

The technology of utilizing a short section twisted polyethylene cable to make high-voltage wall bushing discloses already, after all peelling off the oversheath, metal earth shield layer, semiconductive shielding layer of twisted polyethylene cable during making, the core of leading that two ends are exposed is crimped in the binding post, fix several metal capacitances screen with insulating material vertically on the cable insulation surface then and constitute along the equal laminated structure of face, and fastening outside it with the organic insulation oversheath.But this method is applied to cable terminal also has many problems.Because cable generally reaches tens meters to several kilometers, after the operation, cable insulation can produce contraction in various degree, and can produce big space between binding post, and the equipotential volume that connects binding post and first metal capacitance screen may misplace or throw off.In addition, different with sleeve pipe is when making cable terminal, only peel off oversheath, metal earth shield layer and the semiconductive shielding layer of certain-length, this is fastening with semiconductive shielding layer, metal earth shield layer and oversheath and be electrically connected problem with the last metal capacitance plate with regard to how existing.

The purpose of this utility model provides a kind of in light weight, and is oil-proof, non-maintaining, the novel high-pressure cable terminal that price is low.

This novel high-pressure cable terminal, comprise binding post 1, lead core 8, cable insulation 14, the capacitance plate layer, oversheath 4, full skirt 2, ground lead 6, described capacitance plate layer is a taper metal capacitance screen of fixing several mutually insulateds outside cable insulation vertically with insulating material, shielding the end from first shields nestable mutually, screen is long to be increased one by one, it is characterized in that being pressed in the binding post 1 and connecting the equipotential volume 10 of leading core 8 and first metal capacitance screen 12 is the electric conductors with certain length in reserve, last metal capacitance plate 19 and semiconductive shielding layer 17 at the cable terminal root, metal earth shield layer 18 is fastening continuous by conduction or semi-conductive layer 15, and firmly draws ground lead from metal screen layer 18.Scraped off the portion boundary place with conducting electricity or semiconductive material is made smooth additional edge 16 at the semiconductive shielding layer 17 of cable terminal root and its.On penult metal capacitance screen 20, can draw a measuring lead-in wire 5 of confession.Its oversheath 4 and full skirt 2 adopt anti-aging, uvioresistant, arc resisting hydrophobicity organic material to make.

The utlity model has following advantage:

1. because this cable terminal does not have oil, no porcelain, be difficult for causing environmental pollution, and volume is little, in light weight, low price, a 110kv cable terminal only needs about 30,000 yuan;

2. operation maintenance workload is little, and site operation is simpler, and Gu Ding capacitance plate layer forces voltage to be evenly distributed vertically, has improved along face voltage to distribute, and has improved the flashover voltage and the puncture voltage of cable terminal greatly;

3. owing to scraped off the portion boundary place with conducting electricity or semiconductive material is made smooth additional edge, improved the insulation level of cable terminal at the semiconductive shielding layer of cable terminal root and its;

4. the oversheath of organic insulating material and full skirt have the superperformance of anti-aging, uvioresistant, anti-pollution flashover;

5. but suit is in earthy current transformer, and low price takes up space less, and its precision can reach 0.2 grade.

Embodiment of the present utility model respectively schemes referring to following:

Fig. 1 is an external form schematic diagram of the present utility model

Fig. 2 is a half section schematic diagram of the present utility model

Among the figure:

1---binding post 2---full skirt

3---landmark 4---oversheath

5---measuring lead wire 6---ground lead

7---cables 8---are led core

9---fluid sealant 10---equipotential volume

First metal capacitance screen of 11---oil resistant glue 12---

13---outsourcing insulating tape and self-adhesive tape 14-cable insulation

The additional edge of 15---conduction or semi-conductive layers 16---

17---semiconductive shielding layer 18---metal earth shield layer

19---last metal capacitance plate 20-penult metal capacitance screen

As Fig. 1, shown in 2, at the terminal of cable height according to electric pressure, determine the cable PVC oversheath peelled off and the length of metal earth shield layer, the end is peelled off a bit of cable insulation and is exposed and lead core 8, insert in the endoporus of binding post 1 leading core 8, fixing equipotential line 10 simultaneously compresses with forcing press again, wipe the semiconductive shielding layer 17 of cable terminal root then off by position shown in Figure 2, do not scratch the insulating barrier 14 of cable, and guarantee that insulator surface is smooth as far as possible, make first metal capacitance screen 12 at cable end, and firmly connect with equipotential line 10, equipotential line is a flexible conductor, its length will leave certain nargin, first metal capacitance screen outsourcing semiconductive self-adhesive tape and insulating tape, lay second screen backward along cable after reaching designing requirement, insulating barrier, the 3rd screen, insulating barrier ... to screen 20 second from the bottom, at its root with the some circles of metal wire colligation and draw wiring as measuring with 5 (measuring lead wire links to each other with ground lead during operation) of lead-in wire, before packing end layer metal capacitance screen, scraped off segment boundary place bag at semiconductive shielding layer 17 and its earlier and pasted the paper tinsel or the semiconductive material of conduction, make last metal capacitance plate 19 again after constituting smooth neat additional edge 16, with ground lead 6 usefulness copper cash or brute spring colligation on metal earth shield layer 18, with conduction or semiconductive material 15 parcels and connection final stage capacitance plate 19, semiconductive shielding layer 17, metal earth shield layer 18, last at whole cable terminal outer wrap insulating tape of making and self-adhesive tape 13, and at end filling with sealant 9, oil resistant glue 11, make oversheath 4 with heat-shrink tube at last, make full skirt 2 with the pyrocondensation skirt.Electric pressure is the cable terminal of 66KV, and the number of metal capacitance screen is that the length of 17, the first screens is 200mm, and the length of final stage capacitance plate is 500mm, evenly arranges along the cable insulation laminar surface, and the insulation thickness between the metal capacitance screen is 1mm.

Claims

1. novel high-pressure cable terminal, comprise binding post (1), lead core (8), cable insulation (14), the capacitance plate layer, oversheath (4), full skirt (2), ground lead (6), described capacitance plate layer is a taper metal capacitance screen of fixing several mutually insulateds outside insulating barrier vertically with insulating material, shielding the end from first shields nestable mutually, screen is long to be increased one by one, it is characterized in that being pressed into that to connect the equipotential volume (10) of leading core (8) and first metal capacitance screen (12) in the binding post (1) be the electric conductor with certain length in reserve, last metal capacitance plate (19) and semiconductive shielding layer (17) at the cable terminal root, metal earth shield layer (18) is fastening continuous by conduction or semi-conductive layer (15), and firmly draws ground lead (6) from metal ground connection shielding layer (18).

2. novel high-pressure cable terminal according to claim 1 is characterized in that being scraped off the portion boundary place with conducting electricity or the semiconductive electric material is made smooth additional edge (16) at the semiconductive shielding layer (17) of cable terminal root and its.

3. novel high-pressure cable terminal according to claim 1 and 2 is characterized in that can drawing a measuring measuring lead wire of confession (5) on penult metal capacitance screen (20).

4. novel high-pressure cable terminal according to claim 1 is characterized in that its oversheath (4) and full skirt (2) adopt anti-aging, uvioresistant, arc resisting hydrophobicity organic material to make.