Jiaxing Zhenhua Wire & Cable Co.,Ltd

High quality product, professional service, being the core supplier in laser industry!

Home > News > Content
Welding Cable Waterproof Sealing Greatly Improved
- Jun 21, 2017 -

Welding aluminum Welding Cable has become the mainstream of high-voltage cross-linked Welding Cable metal sets, "Recently, there are experts, China's power sector has been the choice of metal sets of the order is to squeeze lead sets - squeeze aluminum sets - aluminum welding - aluminum-plastic In the choice of metal Welding Cable sets, the welded aluminum sets have been discriminated against, while the extruded aluminum sets are popular, forcing some Welding Cable manufacturers to spend lots of money on imported second-hand presses. As domestic aluminum sets of welding crushing equipment continue to improve , Constantly improve the means of detection and auxiliary water blocking materials continue to progress, so that the quality of welding aluminum and Welding Cable the overall waterproof seal greatly improved welding aluminum Welding Cable more and more users to accept.

Experts said that high-voltage cross-linked Welding Cable metal sets of equipment in foreign development has a long history. From 1797 onwards the use of extrusion method to produce Welding Cable lead, until 1900, almost all of the world's large Welding Cable factory is the use of piston-type extruder manufacturing lead Welding Cable. But because the lead of the mechanical strength is small, heavy weight, and later switched to lead alloy. But lead and lead alloy sets in the Welding Cable by vibration, repeated bending and thermal cycling occurs when the recrystallization, and thus the formation of fine cracks, reducing the water blocking performance. Aluminum sets include extruded (including aluminum and aluminum extrusion), welded and composite aluminum with three, of which land-based Welding Cable to weld the most applications. Due to poor corrosion resistance of aluminum, submarine Welding Cable is no longer recommended use of aluminum sets. Composite aluminum composite layer by the French first developed and used. Aluminum tape thickness of 0.1-0.3mm, coated with polyethylene on one side, longitudinal package on the Welding Cable core and cover the lid.

It is understood that, in addition to Europe in addition to some 400k and 500kV Welding Cable on the use of lead sets, has basically abandoned the traditional vertical pressure aluminum machine, and extensive use of welding equipment. Although some Welding Cable companies in Europe and the United States, such as the United States Southern Welding Cable Company, Germany ABB, France Silec (Silec) and Nexans (Nexans) and other high-voltage cross-linked Welding Cable in the use of various forms of metal sheath: aluminum + Package, lead bag + copper wire, smooth welded aluminum sleeve, corrugated aluminum sleeve, 69kV and 115kV grade Welding Cable also uses aluminum belt bonded composite layer, but in addition to the submarine Welding Cable with lead alloy sets, the land Welding Cable with the most Is welded aluminum sleeve.

(XLPE), ethylene-propylene rubber Welding Cable (EPR) and PVC Welding Cable (PVC), but also for the use of cross-linked polyethylene Welding Cable (PVC), but also for the use of anti-fouling, weather resistance, flame retardant, oil resistance, AppliWelding Cable to oil-immersed paper insulated Welding Cable, in -50 ~ +90 degrees Celsius can be used.

(2) because the material for the rubber material, so small size, light weight, a set of head only about 1KG.

(3) because the material has a heat shrinkability, the installation only need to heat. Simple process, easy to master, low labor intensity.

(4) heat-shrinkable accessories for the dry type, can prevent the Welding Cable head explosion and the like vicious accidents.

(5) heat shrink accessories without any pouring agent, can be installed after the power supply, the most suitable repair works.

Domestic production of heat shrinkable Welding Cable terminal common are RSWY and RSNY and other models. RSWY series models for outdoor terminal, with resistance to temperature changes and anti-fouling performance, life expectancy is more than 15 years; RSNY series for indoor, material with flame retardant, the service life of more than 20 years.

Install the Welding Cable heat shrink terminal should be in the ambient temperature above 0 degrees Celsius, relative humidity below 70% when to avoid insulation surface condensation damp. If the ambient temperature is low, the humidity is large, the installation should be appropriate to the outer Welding Cable before the appropriate heating tide to ensure the installation quality.

The thermal material of the Welding Cable heat shrinkable head is a heat shrinkable heat shrinkable tube. When the temperature reaches 110 to 120 degrees Celsius, the rubber and plastic heat shrink tube begins to shrink, and its shrinkage is 50% ~ 70%. This heat shrinkable tube can withstand up to 140 degrees Celsius high temperature, performance is not affected, but if the temperature is too high, the heating time is too long, the surface will be damaged, or even charred.

In the production of cross-linked polyethylene power Welding Cable thermal termination head, in order to ensure adequate insulation strength, generally take the following measures:

(1) to ensure adequate insulation creep. For this purpose, the three-phase Welding Cable core should have a sufficient length from the bifurcation to the end. For 10KV power Welding Cables are generally about 500-700mm (specific values and indoor terminal or outdoor terminal head), so that each phase outside the core insulation layer can ensure a sufficient length (usually 400 ~ 500mm).

(2) to avoid three-phase bifurcation insulation injury. For this purpose, a small portion of the copper shield (about 55 mm) is retained from the three-phase bifurcation. In order to avoid the branch of each branch insulation sheath was punched, in the three-phase bifurcation should be wrapped around the tape, and put on the three-sheath jacket made of heat-shrinkable insulation material, from the root of the fingers to both ends of the heating fixed The

(3) as far as possible so that the three-phase bifurcation from the copper shield to the inner sheath of the insulation between the electric field evenly. For this reason, a small section (about 20 mm long) of the semiconductor layer is not peeled off between the copper shield of each phase and the inner jacket insulation layer, and the transition between the copper shield, the semiconductor layer and the insulating layer The upper stress tube, the stress tube, encloses the semiconductor layer and laps a portion of the copper shield and the insulating layer on both sides. The stress tube is also heat-shrink insulation material, sealed by heating and fixed.

(4) to avoid the copper shield appears floating potential. To this end, in the three-phase bifurcation should be the phase of the copper shield and the Welding Cable outside the armored metal wire welding and welding, and welding ground wire. Welding application of electric iron, can not use torch, so as not to burn the inner jacket insulation layer.

(5) outdoor Welding Cable terminal head should be put on the rain skirt. The purpose of putting on the skirt is to increase the surface creepage distance. Rainproof skirt with a single hole and three holes of the points. Three together with the three-hole rain skirt sets in the triangle, single-hole waterproof skirt in the middle of the middle.