CN113823984A - Cable fusion connection method - Google Patents

Abstract

The invention discloses a cable fusion connection method, which is characterized by comprising the following steps: stripping the outer sheath, the armored belt, the inner sheath and the conductive shielding layer of the cable to practical sizes according to actual application conditions, and cutting the cable to a cone of the application size by using a corresponding cable tapering cutter; separating the cable conductors in layers, cutting the inner layer monofilament from the inner layer to align and reinforce the two ends of the inner layer monofilament according to a step shape, welding the monofilament by using a silver welding rod, polishing the monofilament to be flat and smooth, cleaning the monofilament, and processing the monofilament from inside to outside in a way that the conductor is welded; repairing the inner shield and the outer shield of the insulating layer; and finally repairing layer by layer. The method adopts a single wire welding mode, has small joint resistance, strong tensile capacity of single wire welding, difficult failure, adopts insulation hot melting repair, is not easy to damage, has long service life, close restoration of the repaired appearance, good integration with the whole cable, good aesthetic property, reasonable method, convenient implementation and suitable popularization.

Description

Cable fusion connection method

Technical Field

The invention relates to a process method for welding a cable joint, in particular to a cable fusion connection method.

Background

With the rapid development of urban power grids and the requirement of economic construction, the rapid growth of cable lines is accompanied by the rapid increase of cable line faults, and at the present stage, the fault rate of joints in the power cable line faults in operation is higher. In the face of continuous joint fault troubles, the recovery cable body fusion connection technology breaks through the traditional cable connection technology design concept, realizes the high-reliability non-interface connection technical process of power cables with any voltage class, provides more reliable technical support for the development of high-voltage and ultrahigh-voltage cable connection technologies, and fills the blank in the field at home and abroad. However, the following problems exist after the cable connection at present: the joint resistance is large; the tensile capacity is poor, so that the failure is easy to occur again, and the service life is influenced; the joint bulges outwards, and the joint and the whole cable cannot be well fused, so that the appearance is poor.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects of the technology and provide a cable fusion connection method.

In order to solve the technical problem, the technical scheme provided by the invention is a cable fusion connection method, which comprises the following steps:

s1, stripping a cable head: stripping the outer sheath, the armor belt, the inner sheath and the conductive shielding layer of the cable to practical sizes according to practical application conditions, and cutting the cable to a cone with the application size by using a corresponding cable tapering cutter, wherein the stripping is not the stripping, and the outer sheath, the armor belt, the inner sheath and the conductive shielding layer are carefully protected during the stripping;

s2, welding a cable conductor: separating the cable conductors in layers, cutting the inner layer monofilament from the inner layer to align and reinforce the two ends of the inner layer monofilament according to a step shape, welding the monofilament by using a silver welding rod, polishing the monofilament to be flat and smooth, cleaning the monofilament, and processing the monofilament from inside to outside in a way that the conductor is welded;

s3, repairing the inner shield and the outer shield of the insulating layer: cleaning a cone, winding a semi-conductive heat-shrinkable tape on the surface of a conductor to be tightly combined with the original semi-conductive tape, winding a high-density hot-melt tape to keep smooth and consistent, winding an isolation tape on the insulating outer layer, winding the isolation tape by using a heating tape, selecting proper temperature and heating time according to the cable model and the cable grade to heat the isolation tape and the insulating outer layer to fuse the isolation tape into a whole, winding the isolation tape on the insulating surface by using the semi-conductive heat-shrinkable tape after cooling to be well overlapped with the original semi-conductive tape, heating and fusing, completing the repair of a cable core, and cooling;

s4, repairing layer by layer: the copper strips of the shielding layer stripped are lapped and finished, the cable is pulled to be formed together by the armor belt, the stripped inner sheath is repaired, after the inner sheath is repaired, the stripped armor belt is wound to the surface close connection of the inner sheath again, the interface is connected or welded by pressing and rolling, the steel belts are different in size and different in thickness, the steel belts can be welded thickly, the armor is completed, the outer sheath is trimmed to be consistent with the surface of the armor belt, the interface is repaired to the outside by using the rest sheath material, the armor belt is wound by the sheath repair belt, the steel belts are baked to be fused, the repair belt is removed, and the outer sheath of the cable is repaired.

Compared with the prior art, the invention has the advantages that: the method adopts a single wire welding mode, has small joint resistance, strong tensile capacity of single wire welding, difficult failure, adopts insulation hot melting repair, is not easy to damage, has long service life, close restoration of the repaired appearance, good integration with the whole cable, good aesthetic property, reasonable method, convenient implementation and suitable popularization.

Detailed Description

Example 1, one type is YJLV22, 3X 50²8.7/15kv cable fusion connection method, comprising the following steps:

s1, stripping a cable head: stripping the outer sheath, the armor belt, the inner sheath and the conductive shielding layer of the cable to practical sizes according to practical application conditions, and cutting the cable to a cone with the application size by using a corresponding cable tapering cutter, wherein the stripping is not the stripping, and the outer sheath, the armor belt, the inner sheath and the conductive shielding layer are carefully protected during the stripping;

s2, welding a cable conductor: separating the cable conductors in layers, cutting the inner layer monofilament from the inner layer to align and reinforce the two ends of the inner layer monofilament according to a step shape, welding the monofilament by using a silver welding rod, polishing the monofilament to be flat and smooth, cleaning the monofilament, and processing the monofilament from inside to outside in a way that the conductor is welded;

s3, repairing the inner shield and the outer shield of the insulating layer: cleaning and smoothing a cone, winding a semi-conductive heat-shrinkable tape on the surface of a conductor to be tightly combined with the original semi-conductive, keeping the winding of a high-density hot-melt tape to be smooth and consistent, winding an isolation tape on the insulating outer layer, winding the isolation tape by using a heating tape, heating the isolation tape at 175 ℃ for 25min to fuse the isolation tape into a whole, after cooling, winding the isolation tape on the insulating surface to be well overlapped with the original semi-conductive, heating and fusing, completing the repair of a cable core, and cooling;

s4, repairing layer by layer: the copper strip lap joint of the shielding layer that peels off is accomplished, take the cable with the armor area and take the shaping together, restore the inner sheath of peeling off, if have the former unnecessary inner sheath that closes not to close outside the fusing and repair the welding, after the inner sheath is restoreed and is accomplished, twine the armor area of peeling off again to inner sheath surface zonulae occludens, wherein the interface adopts the pressure to roll up and connects, the armor is accomplished, the oversheath is pruned and is taken surperficial unanimous with the armor, the interface is mended to the outside with remaining sheath material, it is good to twine with the sheath restoration area, roast to fusing with the fire, go the restoration area, the outer sheath of cable restores and accomplishes.

Example 2, one model is YJV22, 3 x 400²26/35kv cable fusion connection method, comprising the following steps:

s1, stripping a cable head: stripping the outer sheath, the armor belt, the inner sheath and the conductive shielding layer of the cable to practical sizes according to practical application conditions, and cutting the cable to a cone with the application size by using a corresponding cable tapering cutter, wherein the stripping is not the stripping, and the outer sheath, the armor belt, the inner sheath and the conductive shielding layer are carefully protected during the stripping;

s2, welding a cable conductor: separating the cable conductors in layers, cutting the inner layer monofilament from the inner layer to align and reinforce the two ends of the inner layer monofilament according to a step shape, welding the monofilament by using a silver welding rod, polishing the monofilament to be flat and smooth, cleaning the monofilament, and processing the monofilament from inside to outside in a way that the conductor is welded;

s3, repairing the inner shield and the outer shield of the insulating layer: cleaning a cone, winding a semi-conductive heat-shrinkable tape on the surface of a conductor to be tightly combined with the original semi-conductive, winding a high-density hot-melt tape to keep smooth and consistent, winding an isolation tape on the insulating outer layer, winding the isolation tape by using a heating tape, heating at 195 ℃ for 55min to fuse the isolation tape into a whole, after cooling, winding the isolation tape on the insulating surface to be well overlapped with the original semi-conductive, heating and fusing, completing the repair of a cable core, and cooling;

s4, repairing layer by layer: the copper strips of the shielding layer stripped are lapped and finished, the cable is pulled to be formed together by the armor belt, the stripped inner sheath is repaired, original redundant inner sheath which is not closed is repaired and welded outside the fusion, after the inner sheath is repaired and finished, the stripped armor belt is wound to the inner sheath surface tight connection again, the interface is welded, the armor is finished, the outer sheath is trimmed to be consistent with the surface of the armor belt, the interface is repaired to the outside by using residual sheathing materials, the stripped armor belt is wound well, the cable outer sheath is baked to be fused, the repair belt is removed, and the cable outer sheath is repaired and finished.

Relevant experimental data:

the single wire welding resistance of the silver welding rod of the invention is compared with the standard resistance (the testing temperature is 20 ℃, the direct current resistance)

The method adopts a single wire welding mode, has small joint resistance, strong tensile capacity of single wire welding, difficult failure, adopts insulation hot melting repair, is not easy to damage, has long service life, close restoration of the repaired appearance, good integration with the whole cable, good aesthetic property, reasonable method, convenient implementation and suitable popularization.

The present invention and the embodiments thereof have been described above without limitation, and those skilled in the art will be able to devise examples similar to the above embodiments without departing from the spirit and scope of the invention.

Claims (1)

1. A method of fusion splicing cables, comprising the steps of:

s1, stripping a cable head: stripping the outer sheath, the armor belt, the inner sheath and the conductive shielding layer of the cable to practical sizes according to practical application conditions, and cutting the cable to a cone with the application size by using a corresponding cable tapering cutter, wherein the stripping is not the stripping, and the outer sheath, the armor belt, the inner sheath and the conductive shielding layer are carefully protected during the stripping;

s2, welding a cable conductor: separating the cable conductors in layers, cutting the inner layer monofilament from the inner layer to align and reinforce the two ends of the inner layer monofilament according to a step shape, welding the monofilament by using a silver welding rod, polishing the monofilament to be flat and smooth, cleaning the monofilament, and processing the monofilament from inside to outside in a way that the conductor is welded;

s3, repairing the inner shield and the outer shield of the insulating layer: cleaning a cone, winding a semi-conductive heat-shrinkable tape on the surface of a conductor to be tightly combined with the original semi-conductive tape, winding a high-density hot-melt tape to keep smooth and consistent, winding an isolation tape on the insulating outer layer, winding the isolation tape by using a heating tape, selecting proper temperature and heating time according to the cable model and the cable grade to heat the isolation tape and the insulating outer layer to fuse the isolation tape into a whole, winding the isolation tape on the insulating surface by using the semi-conductive heat-shrinkable tape after cooling to be well overlapped with the original semi-conductive tape, heating and fusing, completing the repair of a cable core, and cooling;

s4, repairing layer by layer: the copper strips of the shielding layer stripped are lapped and finished, the cable is pulled to be formed together by the armor belt, the stripped inner sheath is repaired, after the inner sheath is repaired, the stripped armor belt is wound to the surface close connection of the inner sheath again, the interface is connected or welded by pressing and rolling, the steel belts are different in size and different in thickness, the steel belts can be welded thickly, the armor is completed, the outer sheath is trimmed to be consistent with the surface of the armor belt, the interface is repaired to the outside by using the rest sheath material, the armor belt is wound by the sheath repair belt, the steel belts are baked to be fused, the repair belt is removed, and the outer sheath of the cable is repaired.