CN100437839C - Manufacturing method of aluminum alloy core aluminum twisted cross-linked polyethylene insulated water-blocking overhead cable - Google Patents

Abstract

The invention discloses a method for manufacturing an aluminum alloy-cored aluminum twisted cross-linked polyethylene insulated water-blocking overhead cable. The cable is composed of a conductor, a shielding layer and an insulating layer. The inner core part composed of wires and the outer core part composed of twelve pure aluminum wires with the same diameter as the aluminum alloy wires located on the outer layer of the inner core part, the wires are filled with water-blocking yarn, and the conductors are covered with an inner shielding layer , the outer coating insulation layer of the inner shielding layer, and its manufacturing method includes the following steps: 1) the manufacture of the cable conductor; 2) coating the inner shielding layer and the insulating layer; 3) cross-linking of the inner shielding layer and the insulating layer of the forming cable: forming The cables are cross-linked in warm water in a steam room at 100°C for 5-8 hours. The cable manufactured by the method combines the advantages of various existing cables, improves the electrical conductivity of the overhead cable, reduces the weight, improves the tensile strength of the cable, and realizes the longitudinal water blocking function.

Description

Manufacturing method of aluminum alloy core aluminum twisted cross-linked polyethylene insulated water-blocking overhead cable

technical field

The invention relates to a method for manufacturing electric wires and cables, in particular to a method for manufacturing an aluminum alloy-cored aluminum twisted cross-linked polyethylene insulated water-blocking aerial cable.

Background technique

At present, the 10KV insulated lines erected in domestic suburbs are all aluminum cores, and the span cannot be effectively enlarged. The span of insulated wires generally cannot be greater than 50 meters. However, most of the bare conductors in suburban or rural areas have a span of 65-70 meters. When the original bare wires are replaced with ordinary insulated aluminum wires, more places need to insert rods. Some of the inserted rods and even the uneven span, and some places without inserted rods will cause the following series of problems: difficult design, increased cost; line height difference, increased sag, insufficient wind deflection, increased hidden dangers; damaged strength, margin reduce.

The original insulated aluminum wire is not water-blocking. Because the joints overlap and the insulated wires have openings, although the joints are wrapped with insulating and waterproof tape, water can still seep in through them. Over time, rainwater has been infiltrating into the middle of the wire sag along the wire core. Due to the influence of acid rain, a chemical reaction occurs with the aluminum conductor, and the gradual corrosion causes stress disconnection.

If insulated copper wire is used, (1) it is bound to increase the cost (2.55 times that of aluminum); (2) the unit mass of the conductor is large, the sag is large, and the span cannot be enlarged; the safety factor cannot be too small, otherwise the wire tension will be large , the force on the pole is affected; (3) The phenomenon of wire theft is serious;

If the insulated steel-cored aluminum stranded wire is used, although the tension is large, there are the following disadvantages: (1) the steel core and the conductor do not have the same life span, and the steel core is easy to corrode at the stripping opening and the center of the wire sag; (2) due to its steel The resistance of the core is larger than that of aluminum alloy, so the area of the insulated wire increases a lot, and the wind pressure of the wire increases; (3) the proportion of steel is much larger than that of aluminum alloy, and the quality is also large, so the sag will also increase.

Based on the characteristics of the above-mentioned various cables, there is a disadvantage of not blocking water. Although the method of filling oil is used to achieve water blocking performance in the prior art, this method will increase the weight of the cable, so the sag will also increase. , the gear distance is not large, and the pollution is serious during processing.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a method for manufacturing an aluminum alloy-cored, aluminum-stranded, cross-linked polyethylene insulated, water-blocking overhead cable with good electrical conductivity, high tensile strength, and good longitudinal water-blocking performance .

The object of the present invention is achieved by the following technical solutions: a method for manufacturing an aluminum alloy core aluminum twisted cross-linked polyethylene insulated water-blocking overhead cable, the cable is composed of a conductor, a shielding layer, and an insulating layer, and the conductor is located at The inner core part is composed of seven aluminum alloy wires of equal diameter in the center of the cable, and the outer core part is composed of twelve pure aluminum wires with the same diameter as the aluminum alloy wires located on the outer layer of the inner core part. The water blocking wires are filled between the wires Yarn, the conductor is coated with the inner shielding layer, and the inner shielding layer is covered with an insulating layer. The manufacturing method comprises the following steps:

1) Manufacture of cable conductors: through the stranding equipment, three water-blocking yarns are used to wrap longitudinally around an aluminum alloy conductor and then twisted to form the center conductor of the cable; then six water-blocking yarns are used to fill six aluminum alloy conductors In the conductor gap, it is twisted and pressed together with the central conductor to form the inner core of the cable conductor; then three water-blocking yarns are longitudinally wrapped around the twisted and pressed inner core to fill, and then Twelve additional aluminum conductors are twisted and pressed together to form a cable conductor with an inner core and an outer core;

2) Covering the inner shielding layer and insulating layer: they use a double-layer co-extrusion method to coat the inner shielding layer and insulating layer outside the cable conductor through a screw extruder at a temperature range of 160 ° C to 230 ° C;

3) Cross-linking of the inner shielding layer and insulating layer of the formed cable: the formed cable is cross-linked in warm water in a steam room at 100°C for 5 to 8 hours.

In the above-mentioned manufacturing method of an aluminum alloy-cored aluminum-stranded cross-linked polyethylene insulated water-blocking overhead cable, the filling factor used when performing the compaction in step 1) is 0.88.

The above-mentioned method for manufacturing an aluminum alloy cored aluminum stranded cross-linked polyethylene insulated water-blocking overhead cable, wherein the water-blocking yarn is 2000-type water-blocking yarn.

The above-mentioned manufacturing method of aluminum alloy core aluminum twisted cross-linked polyethylene insulated water-blocking overhead cable, wherein, when performing step 2), the temperature zone where the coated inner shield and insulating layer pass through the extrusion screw of the extruder is It is divided into 8 zones according to the average interval of screw length from front to back, among them, zone 1: 160°C-190°C, zone 2: 160°C-190°C, zone 3: 160°C-190°C, zone 4: 160°C-190°C , Zone 5: 170°C-200°C, Zone 6: 170°C-200°C, Zone 7: 170°C-200°C, Zone 8: 200°C-230°C.

The above-mentioned manufacturing method of aluminum alloy-cored aluminum-stranded cross-linked polyethylene insulated water-blocking overhead cable, wherein the inner shielding layer is made of cross-linkable polyethylene material, and when the nominal cross-sectional area of the conductor is ^70mm2 or less, extruding The thickness is 0.5mm; when the nominal cross-sectional area of the conductor is ^95mm2 and above, the extrusion thickness is 0.6mm.

The above-mentioned manufacturing method of aluminum alloy cored aluminum twisted cross-linked polyethylene insulated water-blocking overhead cable, wherein the insulating layer is made of black weather-resistant silane cross-linked polyethylene material, and the extruded thickness is 3.4mm.

In the above-mentioned manufacturing method of an aluminum alloy-cored aluminum-stranded cross-linked polyethylene insulated water-blocking overhead cable, the out-of-roundness of the cable conductor is 6%-8%.

In the above-mentioned manufacturing method of aluminum alloy cored aluminum stranded XLPE insulated water-blocking overhead cable, the stranding equipment used in step 1) is a 500-type fork-type stranding machine and a 36-disk fork-type wire stranding machine.

In the above-mentioned manufacturing method of an aluminum alloy-cored aluminum-stranded XLPE insulated water-blocking overhead cable, the screw extruder used in step 2) is a SYP-1201 type 1+1 extruder.

Adopting the technical scheme of the present invention, the manufactured aluminum alloy core aluminum stranded XLPE insulated water-blocking overhead cable combines the advantages of various existing cables, compared with aluminum alloy core cables and steel core aluminum stranded wire cables , improve the conductivity of the overhead cable and reduce the weight; compared with the aluminum core cable, the tensile strength of the cable is improved, and the erection span of the overhead cable is increased; at the same time, water-blocking yarn is filled between the wires and the wires, so that The longitudinal water blocking function is realized, which can avoid the stress disconnection accident caused by the corrosion of the cable conductor, and the current carrying capacity of the insulated wire will not be reduced due to the filling of the water blocking material.

Description of drawings

Fig. 1 is a cross-sectional view of a cable manufactured by the method for manufacturing an aluminum alloy-cored aluminum-stranded cross-linked polyethylene insulated water-blocking aerial cable of the present invention.

Detailed ways

Please refer to Fig. 1, the cable 1 produced by the manufacturing method of the aluminum alloy core aluminum twisted cross-linked polyethylene insulated water-blocking overhead cable of the present invention is composed of a conductor 2, a water-blocking yarn 3, an inner shielding layer 4 and an insulating layer 5 . The conductor 2 includes an inner core part 21, an outer core part 22 and a water-blocking yarn 3 arranged between the conductors 2, wherein the inner core part 21 is composed of a central conductor located at the center of the cable 1 and six aluminum wires surrounding the central conductor. The outer core 22 is located on the outer layer of the inner core 21 and is composed of twelve pure aluminum wires.

The manufacturing method of the aluminum alloy core aluminum stranded XLPE insulated water-blocking aerial cable 1 comprises the following steps:

1) Manufacture of cable conductor 2: through 500-type fork-type stranding machine and 36-type fork-type stranding machine and other stranding equipment, three 2000-type water-blocking yarns are longitudinally wrapped around an aluminum alloy conductor and then stranded , to make the center conductor of the cable; then fill the gaps of the six aluminum alloy conductors with six 2000-type water-blocking yarns, and then twist and press them together with the center conductor to make the inner core part 21 of the cable conductor; then use three 2000-type water-blocking yarns Type water-blocking yarn 3 is longitudinally wrapped and filled outside the twisted and compressed inner core 21, and then twelve aluminum conductors are added to it and twisted and compressed together to form an inner core and an outer core. 22 cable conductors; the filling factor used in tight pressing is 0.88, and the out-of-roundness of cable conductors is 6% to 8%.

2) Coating the inner shielding layer 4 and the insulating layer 5: the inner shielding layer 4 is made of cross-linked polyethylene material, and the insulating layer 5 is made of black weather-resistant silane cross-linked polyethylene material. They pass SYP-1201 type 1+1 screw type The extruder adopts a double-layer co-extrusion method to cover the inner shielding layer 4 and the insulating layer 5 outside the cable conductor. The temperature zone on the screw extruded by the extruder is divided into 8 zones at an average interval from the front to the back of the screw length, of which , Zone 1: 160°C-190°C, Zone 2: 160°C-190°C, Zone 3: 160°C-190°C, Zone 4: 160°C-190°C, Zone 5: 170°C-200°C, Zone 6: 170°C ℃-200℃, zone 7: 170℃-200℃, zone 8: 200℃-230℃; when the nominal cross-sectional area of the conductor is ^70mm2 or below, the extrusion thickness of the inner shielding layer 4 is 0.5mm; When the cross-sectional area is ^95mm2 and above, the extrusion thickness of the inner shielding layer 4 is 0.6mm; when the nominal cross-sectional area of the conductor is ^70mm2 and below and ^95mm2 and above, the extrusion thickness of the insulating layer 5 is 3.4mm.

3) Cross-linking of the inner shielding layer 4 and insulating layer 5 of the formed cable: cross-link the formed cable with warm water in a steam room at 100°C for 5-8 hours.

The above-mentioned manufacturing method of aluminum alloy core aluminum twisted cross-linked polyethylene insulated water-blocking overhead cable was adopted, and the performance of the cable was tested to meet the requirements listed in the following table:

Those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present invention, rather than as a limitation to the present invention, as long as within the spirit of the present invention, the above-described embodiments Changes and modifications will fall within the scope of the claims of the present invention.

Claims (9)

1. the manufacture method of the crosslinked polyetylene insulated aerial cable that blocks water of aluminium alloy core, aluminium strand, this cable is made of conductor, screen, insulating barrier, the inner core that described conductor is made of seven equal diameter aluminium alloy conductors that are positioned at cable center and be positioned at that inner core is outer field to be made up of 12 outer cores that constitute with the isodiametric fine aluminium lead of aluminium alloy conductor, be filled with water blocking yarn between the lead, conductor coats internal shield outward, internal shield outsourcing insulating layer coating, its manufacture method comprises the following steps:

1) manufacturing of cable conductor: outside an aluminium alloy conductor, fill earlier afterwards strandedly by wire twisting equipment, make the center conductor of cable with three water blocking yarn longitudinal lappings; Then be filled among the six roots of sensation aluminium alloy conductor slit with six roots of sensation water blocking yarn, stranded and press with center conductor again, make the inner core of cable conductor; Filling outside stranded and the inner core of pressing with three water blocking yarn longitudinal lappings then, adding 12 aluminium conductors and stranded together and press at it again, making cable conductor with inner core and outer core;

2) coat internal shield and insulating barrier: they adopt internal shield and insulating barrier outside the double-layer coextrusion method coating cable conductor by the screw-type extrusion machine under 160 ℃～230 ℃ temperature province;

3) moulding cable internal shield and insulating barrier is crosslinked: moulding cable warm water crosslinking 5～8 hours in 100 ℃ of vaporiums.

2. the manufacture method of the crosslinked polyetylene insulated aerial cable that blocks water of aluminium alloy core, aluminium according to claim 1 strand is characterized in that, in execution in step 1) described pressing the time activity coefficient that adopts be 0.88.

3. the manufacture method of the crosslinked polyetylene insulated aerial cable that blocks water of aluminium alloy core, aluminium strand according to claim 1 is characterized in that described water blocking yarn adopts 2000 type water blocking yarns.

4. the manufacture method of the crosslinked polyetylene insulated aerial cable that blocks water of aluminium alloy core, aluminium strand according to claim 1, it is characterized in that, in execution in step 2) time, coating internal shield and insulating barrier is to be divided into 8 districts in the equispaced from front to back with spiro rod length through the humidity province on the plastic extruding machine extrusion screw rod, wherein, 1 district: 160 ℃-190 ℃, 2 districts: 160 ℃-190 ℃, 3 districts: 160 ℃-190 ℃, 4 districts: 160 ℃-190 ℃, 5 districts: 170 ℃-200 ℃, 6 districts: 170 ℃-200 ℃, 7 districts: 170 ℃-200 ℃, 8 districts: 200 ℃-230 ℃.

5. the manufacture method of the crosslinked polyetylene insulated aerial cable that blocks water of aluminium alloy core, aluminium according to claim 1 strand is characterized in that described internal shield adopts the crosslinkable polyethylene material, when the conductor nominal area of section at 70mm ²And when following, extruding thickness is 0.5mm; When the conductor nominal area of section at 95mm ²And when above, extruding thickness is 0.6mm.

6. the manufacture method of the crosslinked polyetylene insulated aerial cable that blocks water of aluminium alloy core, aluminium strand according to claim 1 is characterized in that described insulating barrier adopts black weather resistant silane crosslinked polyethylene, and extruding thickness is 3.4mm.

7. the manufacture method of the crosslinked polyetylene insulated aerial cable that blocks water of aluminium alloy core, aluminium strand according to claim 1 is characterized in that the deviation in roundness of described cable conductor is 6%～8%.

8. the manufacture method of the crosslinked polyetylene insulated aerial cable that blocks water of aluminium alloy core, aluminium according to claim 1 strand is characterized in that, in execution in step 1) time wire twisting equipment that adopts be 500 type crosswise wire stranders and 36 dish V shape thread reaming machines.

9. the manufacture method of the crosslinked polyetylene insulated aerial cable that blocks water of aluminium alloy core, aluminium according to claim 1 strand is characterized in that, in execution in step 2) time screw-type extrusion machine that adopts be SYP-1201 type 1+1 plastic extruding machine.

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