CN2836286Y - Integral preformed rubber piece for high-voltage cable connection - Google Patents

Abstract

The utility model relates to an integral preformed rubber piece for high-voltage cable connection. A semi-conductive hollow outer circular cylinder on the left end part, a semi-conductive hollow inner circular cylinder on the right end part and rubber insulation materials filled between the semi-conductive hollow outer circular cylinder on the left end part and the semi-conductive hollow inner circular cylinder on the right end part form an integral preformed hollow cylinder which is used on a middle joint of a power cable; the left end part of a rubber piece is provided with a small step. The integral preformed rubber piece for high-voltage cable connection is characterized in that the axial length from an end part starting angle (1) on the left end of the rubber piece to the small step on the left end part of the rubber piece is 30 mm at least. The utility model has the advantages that banding force of a contact surface of the rubber piece and a cable is added to enhance the electrical breakdown resistance property of a cable shielding cutting-off point and the starting angle on the end part of the rubber piece so as to enhance the integral property of a middle joint of a high-voltage cable; the probability of breakdown failures near the cable shielding cutting-off point or a metallic shielding cover arranged on a cable is reduced to cause a cable transmission line to run more stably, wherein the probability of breakdown failures is caused by the relative displacement between the rubber piece and a cable body during running.

Description

High-tension cable connects uses integral prefabricated rubber parts

One, technical field:

The utility model relates to a kind of cable joint, particularly discloses the integral prefabricated rubber parts of a kind of high-tension cable connection.

Two, background technology:

Application for a patent for invention number is: 98105398.X, name is called the application of " premolded unit that is used for the power cable joint ", the hollow outside cylinder in end by hollow interior cylinder in the end of a semiconductive material and semiconductive material, the electro-insulating rubber material evenly riddles the high voltage power cable transition joint rubber parts of the outstanding whole mould injection forming that combines of cylindrical shape between the inside and outside cylinder, and the hollow outside cylinder of its medial end portions edge extends one and covers the outer semi-conductive layer that covers that the insulating material cylindrical shape is given prominence to.

Have data to show, under different interfacial pressures, the anti-electrical breakdown performance at interface is different.The anti-electrical breakdown performance relation in direct ratio at interfacial pressure and interface.The hollow cylindrical rubber parts that whole mould notes in application number 98105398.X form is by being nested into self it the smooth cable insulation surface of the external diameter processing bigger slightly than its internal diameter, tightening force by rubber parts self on the contact interface of the two produces an interfacial pressure, thereby improve the anti-electrical breakdown performance in interface, add the performance of the even cable intermediate joint internal electric field that rubber parts self had, thereby obtain a good high voltage power cable transition joint electro-insulating rubber spare.Yet in the middle of actual motion, be nested between rubber parts on the cable and the cable relative displacement can take place, if rubber parts is with respect to the excessive words of cable displacement numerical value, breakdown fault can take place in rubber parts semiconductive high-field electrode place, and rubber parts end semi-conductive screen also can lose due shield effectiveness, when serious even can puncture.Cover semi-conductive layer 4 in addition and be insulated the end semiconductive of the rubber parts right-hand member that material 3 shielding cuts off outside rubber parts and need enough distances to satisfy their leakage distance between the cylinder in hollow, this leakage distance is 37.5mm.In order to address the above problem, need to make again the each several part size of rubber parts and defining.

Three, summary of the invention:

Technical problem to be solved in the utility model is to overcome defective in the above-mentioned prior art, improves rubber parts integral insulation performance, makes the circuit outlet line more stable, discloses the integral prefabricated rubber parts of a kind of high-tension cable connection.

The utility model is achieved in that the integral prefabricated rubber parts of a kind of high-tension cable connection, the hollow outside cylinder of left part semiconductive, cylinder in the right part semiconductive is hollow, and be filled in rubber insulation material between the two, the three has formed an integral prefabricated hollow cylinder that is used for the power cable transition joint, in the rubber parts left part small stair is arranged, it is characterized in that: end initial angle 1 place of described rubber parts left end should be 30mm at least to the axial length A at small stair place, rubber parts left part.

1) be in the application of 98105398.X, at application number, with cover the hollow outside cylinder in semiconductive end that semi-conductive layer is connected outward a small stair and a big step partly arranged, in the utility model, only kept small stair, and use and this semiconductive part identical materials has been filled and led up big step, implementation is Integratively formed in mould is annotated, and accompanying drawing two is a rubber parts end partial enlarged drawing, and dotted portion is represented the big step of hollow exterior circular column rubber parts among the figure.Assign to increase the interface tightening force on rubber parts and the cable insulation surface of handling by fill and lead up outside big stage portion with semiconductive material like this, thus the anti-electrical breakdown performance in raising interface.Shown in figure three, figure three is through surface treatment and the schematic diagram after cable conductor having been connected.The insulation shielding of cable body will be cut off when handling cable, and be necessary by the interfacial pressure that increases material and increase the insulation shield cut-off part, the increase of this place's interfacial pressure can improve the overall performance of joint, and, be the big step among the 98105398.X so select to use semiconductive material to fill and lead up application number because the material of end is a semiconductive material.In sum, because the distance between the cable body semi-conductive screen cut-off part can become big, and near the interface resistance to sparking of this shielding can be again very important, so the big step of filling and leading up in the application that application number is 98105398.X is necessary.Fill and lead up the length A 〉=30mm of part.The right endpoint of attention A and rubber parts end initial angle 1 are on same radial alignment.And the difference of the interior external diameter of rubber parts of the present utility model is B 〉=30mm.

2), the aforementioned fact that relative displacement can take place of having mentioned between cable and the rubber parts, and the direction and the size of this part displacement all is different in the middle of actual.Insulation shielding cut-off part at actual central cable body should be in (from the joint centre position outwards) of the semi-conductive screen left position at rubber parts two ends, and the distance of 1cm to 2cm probably arranged between the two.If the insulation shielding of cable body has been displaced in partly any one of two semiconductives at rubber parts two ends, be insulation shield to the third side to displacement and surpassed the position of rubber parts end profile shielding curve initial angle 1, will make rubber parts lose due shield effectiveness, because rubber parts comes the electric field of homogenizing cable body insulation shielding cut-off part just by the curve of the semiconductor at its two ends.Like this, for fear of this thing happens, the axial length at the utility model regulation rubber parts two ends and the contacted semiconductor of cable interface should be 40mm, i.e. C 〉=40mm at least.

3), with reference to the accompanying drawings 4: in the joint mounting process with the conductor of two sections cables with aluminium hydraulic pressed connecting pipe 7 crimping after, in the conductor outside one hollow cylinder metallic shield is installed, 8 are described radome in the accompanying drawing 4.The outside diameter of cable of this radome external diameter and treated mistake much at one, this moment two sections cables be connected to an external diameter integral body much at one by radome.Just the rubber parts after the hole enlargement is installed to the junction of two sections cables then, the semiconductive high-tension shielding electrode 2 that installs the back rubber parts should cover on the metallic shield, and the center position that the back rubber parts should be positioned at the cable connection in theory is installed.But in actual motion, metallic shield also can with the semiconductive high-tension shielding electrode generation relative displacement of rubber parts.In case displacement is excessive, the end of metallic shield has fails the part that covered by the rubber parts high-field electrode, in this part the electrical breakdown fault will take place.So for fear of such fault takes place, the length of the utility model regulation rubber parts semiconductive high-field electrode should be 225mm, D 〉=225mm at least.Metallic shield has the dimensions for the size that cooperates aluminium hydraulic pressed connecting pipe 7 must require tool in addition, in order to satisfy the requirement that metallic shield can be covered by rubber parts semiconductive high-field electrode fully, the length that also requires rubber parts semiconductive high-field electrode is greater than more than the metallic shield 30mm.

1), with reference to the accompanying drawings 1, the length E the utility model that covers the end of semi-conductive layer outside first step of rubber parts plays is defined as greater than 440mm, i.e. E 〉=440mm.And from outside cover semi-conductive layer 4 the end, end must satisfy to being insulated leakage distance the hollow inner cylinder of right-hand member semiconductive that material cuts off 〉=regulation (for the transition joint of 110kV high-tension cable) of 37.5mm.

2), in order to increase by 1 effectively), described in interfacial pressure improve the electrical property of joint, prevent 2), described in the operation troubles brought of displacement.The numerical value ratio that defines between above described C, B and the A is C: A: B=4: 3: 3 or C: A: B=3: 2.3: 2.

The beneficial effects of the utility model are: 1, by more optimal structural design, increased contact with the cable tightening force on surface of rubber parts, thereby strengthened the two anti-electrical breakdown performance at cable shield cut-off part and rubber parts end initial angle 1 place particularly at the interface, improved the overall performance of high voltage power cable transition joint.2, by axial length that increases rubber parts end semiconductive material C and the length that increases the inner semiconductive material high-tension shielding of rubber parts electrode, reduced near the probability of the breakdown fault of institute's metallic shield of adorning on cable shield cut-off part that the relative displacement between in service because rubber parts and the cable body causes or the cable, cable transmission line is more stably moved.

Four, description of drawings:

Accompanying drawing 1 is the rubber parts half-sectional view;

Accompanying drawing 2 is rubber parts left part partial enlarged drawings;

Accompanying drawing 3 is cable connection diagrams;

Accompanying drawing 4 is that rubber parts combines schematic diagram with cable;

Accompanying drawing 5 is rubber parts half-sectional views that brush coheres reliable semiconducting coating on insulation.

In the drawings: 1, rubber parts semiconductive end initial angle; 2, rubber parts semiconductive high-tension shielding electrode; 3, rubber parts insulating material; 4, glue spare covers semi-conductive layer outward; 5, cable XLPE (crosslinked polyethylene) insulation is terminal; 6, cable copper core; 7, cable core aluminium hydraulic pressed connecting pipe; 8, metallic shield; 9, the hollow outside cylinder in end; 10, the hollow interior cylinder in end; P ₁And P ₂, the insulation shield cut-off part.

Five, embodiment:

In advance with cylinder in the semiconductive end and semiconductive end outside cylinder and semiconductive electrode high pressure sulfidization molding in mould, semiconductive end outside cylinder has been removed application number when sulfidization molding be the big step of the application medial end portions outside cylinder of 98105398.X, implementation method is when the mould of end outside cylinder is made in design above-mentioned big step part to be made in the die cavity, then the material feeding global formation.Then the mode of just annotating with mould with insulating material be injected into as shown in accompanying drawing 13 in the after cure moulding.Cylinder and end outside cylinder are insulated the material partition to form the insulation interruption in the moulding rearward end.On improved size, the utility model is got a kind of compound mode: the inside and outside cylinder in semiconductive end contact with cable the part length C be 40mm, the small stair right-hand member is 30mm to the distance A between its beginning angle 1, end, it is 446mm to outward from E that the small stair right-hand member covers the semi-conductive layer end-to-end distance, the rubber parts thickness B is 30mm, yet the size in implementing is not limited to above-mentioned size, and any combination of the size of defined can solve the problem of the required solution of the utility model in claims.

When the outside cylinder of prefabricated semiconductive end mentioned above, the rubber parts insulation that semiconductive end outside cylinder is extended out is outer to be covered semi-conductive layer and spins off.And the method that adopts outer brush to cohere reliable semiconducting coating reaches with semiconductive integral body and covers the same effect of semi-conductive layer outward.As shown in Figure 5: the hollow outside cylinder in rubber parts semiconductive end still adopts whole method of making in advance at mark M with the part on a left side in mould, mark Q with a left side the part method that then adopts outer brush to cohere reliable semiconducting coating reach with semiconductive integral body and cover the same effect of semi-conductive layer outward.And any combination in the size range that the combination on the size is taked to provide in claims gets final product.

Claims (6)

1, the integral prefabricated rubber parts of a kind of high-tension cable connection, the hollow outside cylinder of left part semiconductive, cylinder in the right part semiconductive is hollow, and be filled in rubber insulation material between the two, the three has formed an integral prefabricated hollow cylinder that is used for the power cable transition joint, in the rubber parts left part small stair is arranged, it is characterized in that: the axial length A that the end initial angle (1) of described rubber parts left end is located small stair place, rubber parts left part should be 30mm at least.

2, high-tension cable according to claim 1 connects and uses integral prefabricated rubber parts, it is characterized in that: should be 40mm at least with the axial length C at the semiconductor interface at the contacted left and right end portions rubber parts of cable two ends.

3, integral prefabricated rubber parts is used in high-tension cable connection according to claim 1 and 2, and it is characterized in that: the length between C, A and the B is than being C: A: B=4: 3: 3 or C: A: B=3: 2.3: 2.

4, according to claim 1 or the integral prefabricated rubber parts of 2 or 3 described high-tension cables connections, it is characterized in that: the high-field electrode that is equipped with one deck semiconductive material in the interposition of hollow cylinder rubber parts, the length of this high-field electrode should be 225mm at least, and the total length of this high-field electrode being installed in more than the metallic shield 30mm on the cable of should exceeding that it covers.

5, the integral prefabricated rubber parts of high-tension cable connection according to claim 4, it is characterized in that: have near the outer semi-conductive layer that covers the cylinder in extending to from semiconductive outside cylinder outer surface, this semi-conductive layer is can be with the hollow outside cylinder of semiconductive whole or cooperate moulding, also can adopt directly the insulating material surface brush cohere with semiconductive integral body outside cover the semiconducting coating of the same reliable effect of semi-conductive layer.

6, the integral prefabricated rubber parts of high-tension cable connection according to claim 5, it is characterized in that: cover outward semi-conductive layer terminal to rubber parts left end small stair be not less than 440mm apart from E, and cover outward semi-conductive layer terminal to the rubber parts semiconductive hollow in surface leakage between the cylinder apart from must be greater than 37.5mm.

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