CN117080988A - Manufacturing method of cold-shrink terminal end of three-core high-voltage crosslinked polyethylene insulated cable - Google Patents
Manufacturing method of cold-shrink terminal end of three-core high-voltage crosslinked polyethylene insulated cable Download PDFInfo
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- CN117080988A CN117080988A CN202310895274.0A CN202310895274A CN117080988A CN 117080988 A CN117080988 A CN 117080988A CN 202310895274 A CN202310895274 A CN 202310895274A CN 117080988 A CN117080988 A CN 117080988A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 229920003020 cross-linked polyethylene Polymers 0.000 title claims abstract description 19
- 239000004703 cross-linked polyethylene Substances 0.000 title claims abstract description 19
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 26
- 229910052802 copper Inorganic materials 0.000 claims abstract description 26
- 239000010949 copper Substances 0.000 claims abstract description 26
- 239000010959 steel Substances 0.000 claims abstract description 26
- 238000007789 sealing Methods 0.000 claims abstract description 11
- 238000009434 installation Methods 0.000 claims abstract description 10
- 238000002788 crimping Methods 0.000 claims abstract description 5
- 238000009413 insulation Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 17
- 239000002390 adhesive tape Substances 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 5
- 239000000565 sealant Substances 0.000 claims description 5
- 239000003292 glue Substances 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 210000003811 finger Anatomy 0.000 description 4
- 230000035882 stress Effects 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000011810 insulating material Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000819 phase cycle Methods 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 210000004932 little finger Anatomy 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 201000009240 nasopharyngitis Diseases 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/02—Cable terminations
- H02G15/04—Cable-end sealings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/02—Cable terminations
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- Cable Accessories (AREA)
Abstract
The invention provides a manufacturing method of a cold-shrink terminal head of a three-core high-voltage crosslinked polyethylene insulated cable, which comprises the following steps: respectively installing grounding wires at the root parts of the steel armor and the three-core copper shield of the pretreated cable, and sealing to obtain a first cable; mounting a cold shrink three fingerstall and a cold shrink insulating tube on the first cable to obtain a second cable; arranging the leads of the second cable according to the internal sequence in the high-voltage cabinet; the cold shrinkage terminal is sleeved with the cold shrinkage terminal to obtain a third cable by aligning with the mounting datum point of the cold shrinkage terminal; and sleeving the wiring terminal into the wire core of the third cable, crimping the wiring terminal and sealing to finish the cable installation. According to the invention, the cable leads are stripped to a proper length, and the cable leads are reasonably arranged outside the cable bin, so that the cables are ensured not to cross each other when entering the cable bin, the cold-shrink cable heads are vertically and orderly arranged in the cable bin, the safe operation of the cable heads is ensured, the electrical accidents are reduced, the cable manufacturing and guiding time is greatly saved, and the labor efficiency is improved.
Description
Technical Field
The invention relates to the technical field of cable installation, in particular to a method for manufacturing a cold-shrink terminal head of a three-core high-voltage crosslinked polyethylene insulated cable.
Background
At present, the 35KV three-core crosslinked polyethylene cable for power transmission and transformation of a power system is further popularized, the design capacity of a switch cabinet is further improved, the number of cable access strips in a high-voltage cabinet is also increased, and the difficulty of cable connection is increased. The terminal end of the 35kv crosslinked polyethylene cable is manufactured and installed by adopting a thermal shrinkage process and a cold shrinkage process. When the thermal shrinkage cable end operates, various insulation defects, such as insufficient insulation breakdown of the space, gradually occur in the gap between the thermal shrinkage material and the cable body, which is generated by thermal expansion and cold shrinkage; aging the heat-shrinkable insulating material; uneven heating of the insulation treatment process is easy to wet and water is easy to enter, so that breakdown discharge is caused; the electric field distribution is more concentrated, and the breakdown explosion is easy; the service life of the insulating material is short, and the insulating material needs to be replaced periodically, so that the cable length is insufficient, and the later use is influenced. Aiming at the phenomenon, the high-voltage cross-linked polyethylene insulated cable terminal head cold shrinkage process is widely popularized at present, and the problem brought by the heat shrinkage cable terminal head is solved. The manufacturing process and the material performance of the cold-shrink cable terminal overcome the defects of the manufacturing process of the heat-shrink cable terminal, but the important problem that cable head accidents frequently occur due to the fact that cable leads in a cable bin of a high-voltage cabinet are crossed, stress tubes are stressed unevenly can not be overcome according to the traditional manufacturing process of the heat-shrink cable terminal or the cold-shrink terminal.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a manufacturing method of a cold-shrink terminal head of a three-core high-voltage crosslinked polyethylene insulated cable.
In order to achieve the above object, the present invention provides the following solutions:
a manufacturing method of a cold-shrink terminal end of a three-core high-voltage crosslinked polyethylene insulated cable comprises the following steps:
step 1: stripping the outer sheath, the steel armor and the inner sheath with preset lengths on the cable to obtain a pretreated cable;
step 2: respectively installing grounding wires at the steel armor and three-core copper shielding root parts of the pretreated cable, and sealing to obtain a first cable;
step 3: mounting a cold shrink three fingerstall and a cold shrink insulating tube on the first cable to obtain a second cable;
step 4: arranging the leads of the second cable according to the internal sequence in the high-voltage cabinet;
step 5: performing insulation treatment on the second cable and determining a cold shrink terminal installation datum point;
step 6: sleeving the cold shrink terminal into the cold shrink terminal to obtain a third cable by aiming at the mounting datum point of the cold shrink terminal;
step 7: and sleeving the wiring terminal into the wire core of the third cable, crimping the wiring terminal and sealing to finish cable installation.
Preferably, the step 1: stripping the outer sheath, the steel armor and the inner sheath with preset lengths on the cable to obtain the pretreated cable, and the cable comprises the following components:
step 1.1: placing the cable at a preset position, straightening and leveling the end part of the cable, and cleaning the surface of the outer sheath;
step 1.2: stripping the outer sheath, the steel armor and the inner sheath of the cable, wherein the stripping length adopts the formula: s=a+b+300 mm; s represents the stripping length, A represents the splicing length of the cable bin, and B represents the length from the fixed part of the cable clamp to the bottom of the high-voltage cabinet;
step 1.3: and polishing by using an abrasive belt to remove an oxide layer and paint on the surface of the steel armor to obtain the pretreated cable.
Preferably, the step 2: respectively installing grounding wires at the steel armor and three-core copper shielding roots of the pretreated cable and sealing to obtain a first cable, wherein the method comprises the following steps:
step 2.1: fixing a first grounding wire on the steel armor by using a first constant force spring;
step 2.2: completely wrapping the steel armor and the first constant force spring to the 30mm position of the cable outer sheath by using an insulating self-adhesive tape, so that the first grounding wire is completely separated from the copper shield of the cable;
step 2.3: winding a second grounding wire on the root of the three-core copper shield of the cable, and fixing the second grounding wire by using a second constant force spring;
step 2.4: the three-core copper shield root, the second grounding wire and the second constant force spring of the cable are completely wrapped by insulating self-adhesive tape to the position of 30mm of the cable outer sheath.
Preferably, in the step 3, a shrink three fingerstall is installed on the first cable, including:
step 3.1: completely wrapping three layers of filling glue at the position of 40mm from the three-phase bifurcation of the first cable to the cable outer sheath;
step 3.2: wrapping 50mm of the cable outer sheath with waterproof sealant, wrapping two layers, and sandwiching the first and second grounding wires so as to prevent moisture from penetrating along the grounding wire gaps;
step 3.3: uniformly coating a layer of silica gel on the filling adhesive, and sleeving the cold-shrink three finger sleeves into the root parts of the three-phase bifurcation ports of the cable;
step 3.4: the first grounding wire and the second grounding wire are fixed on the outer sheath of the cable by PVC phase color tapes.
Preferably, in the step 3, mounting a cold shrink insulating tube on the first cable includes:
and sleeving a plurality of cold-shrink insulating pipes on the three cores of the cable respectively, so that the cold-shrink insulating pipes are lapped at the root parts of the cold-shrink three fingertips, the cold-shrink insulating pipes are contracted on the cable, and when the cold-shrink insulating pipes are contracted, each cold-shrink insulating pipe is lapped with the last cold-shrink insulating pipe by more than 30mm until each phase is contracted to the stress cone part of the lead.
Preferably, the step 5: performing insulation processing on the second cable and determining a cold shrink terminal installation datum point, comprising:
step 5.1: a 10mm copper shield is reserved upwards at the end part of the cold shrink insulating tube of the second cable, and the rest is stripped;
step 5.2: a 20mm semiconductive layer is reserved upwards at a copper shielding fracture of the second cable, and the rest is stripped;
step 5.3, the fracture of the semiconductive layer is trimmed to form a 45-degree groove, and the groove is polished by an abrasive belt to ensure that the groove is in smooth transition with the insulation of the cable and is cleaned;
step 5.4: the semi-conductive fracture of the second cable is downwards arranged at the cold shrink insulating tube, a preset distance is measured to be used as a mounting datum point of the cold shrink terminal, and a PVC phase ribbon is used for making limit marks;
step 5.5: wrapping two layers with a semiconducting tape from the copper shielding fracture of the second cable to 10mm of the semiconducting layer;
step 5.6: the second cable is uninsulated according to terminal Kong Shenqie and the sharp corners are removed from the cable insulation break.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
compared with the prior art, the method for manufacturing the cold-shrink terminal head of the three-core high-voltage crosslinked polyethylene insulated cable has the advantages that the cable leads are stripped to the proper length and are reasonably arranged outside the cable bin, so that the cables are not crossed when entering the cable bin, the cold-shrink cable head is vertically and orderly arranged inside the cable bin, the safe operation of the cable head is ensured, the electrical accidents are reduced, the cable manufacturing and guiding time is greatly saved, and the labor efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic stripping diagram of a conventional three-core high-voltage crosslinked polyethylene insulated cable provided by the invention;
fig. 2 is a schematic stripping diagram of a three-core high-voltage crosslinked polyethylene insulated cable provided by the invention;
FIG. 3 is a schematic diagram of a cable insulation process according to the present invention;
FIG. 4 is a schematic view of a fabricated cable cold-shrink termination provided by the present invention;
fig. 5 is a front view of a cable lead and a high-voltage cabinet according to the present invention;
fig. 6 is a right side view of the connection between the cable lead and the high-voltage cabinet.
Symbol description:
1. an outer sheath; 2. steel armor; 3. an inner sheath; 4. copper shielding; 5. a ground wire; 6. cold shrinking three finger sleeves; 7. PVC phase color tape; 8. a cold shrink terminal; 9. a cold shrink seal tube; 10. and a connection terminal.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to achieve the above object, the present invention provides the following solutions:
referring to fig. 1-6, a method for manufacturing a cold-shrink terminal end of a three-core high-voltage cross-linked polyethylene insulated cable includes:
step 1: stripping the outer sheath, the steel armor and the inner sheath with preset lengths on the cable to obtain a pretreated cable;
further, the step 1 includes:
step 1.1: placing the cable at a preset position, straightening and leveling the end part of the cable, and cleaning the surface of the outer sheath;
step 1.2: stripping the outer sheath, the steel armor and the inner sheath of the cable, wherein the stripping length adopts the formula: s=a+b+300 mm; s represents the stripping length, A represents the splicing length of the cable bin, and B represents the length from the fixed part of the cable clamp to the bottom of the high-voltage cabinet; after stripping the cable outer jacket, steel armor and inner jacket, the copper shield was temporarily secured with PVC phase tape on top of each phase.
Step 1.3: and polishing by using an abrasive belt to remove an oxide layer and paint on the surface of the steel armor to obtain the pretreated cable.
Step 2: respectively installing grounding wires at the steel armor and three-core copper shielding root parts of the pretreated cable, and sealing to obtain a first cable;
further, the step 2 includes:
step 2.1: fixing a first grounding wire on the steel armor by using a first constant force spring;
in practical application, before step 2.1, the surface dirt and the steel armor surface of the cable stripping part, which is 50mm long downwards, need to be cleaned.
Step 2.2: completely wrapping the steel armor and the first constant force spring to the 30mm position of the cable outer sheath by using an insulating self-adhesive tape, so that the first grounding wire is completely separated from the copper shield of the cable;
step 2.3: winding a second grounding wire on the root of a three-core copper shield of the cable, and fixing the second grounding wire by using a second constant force spring (the first grounding wire is diagonally separated from the second grounding wire);
step 2.4: the three-core copper shield root, the second grounding wire and the second constant force spring of the cable are completely wrapped by insulating self-adhesive tape to the position of 30mm of the cable outer sheath.
Step 3: mounting a cold shrink three fingerstall and a cold shrink insulating tube on the first cable to obtain a second cable;
further, the step 3 includes:
step 3.1: completely wrapping three layers of filling glue at the position of 40mm from the three-phase bifurcation of the first cable to the cable outer sheath;
step 3.2: wrapping 50mm of the cable outer sheath with waterproof sealant, wrapping two layers, and sandwiching the first and second grounding wires so as to prevent moisture from penetrating along the grounding wire gaps;
step 3.3: uniformly coating a layer of silica gel on the filling glue, sleeving the cold-shrink three finger sleeves into the root parts of three-phase bifurcation ports of the cable, and firstly pulling the main body of the finger sleeve anticlockwise and then pulling the support strips of the little finger anticlockwise so as to respectively shrink on the cable;
step 3.4: fixing the first grounding wire and the second grounding wire on an outer sheath of the cable by using a PVC phase ribbon;
step 3.5: and determining the number of cold shrink tubes according to the length of the cable lead, sleeving a plurality of cold shrink insulating tubes on the three cores of the cable respectively, enabling the cold shrink insulating tubes to be lapped on the root parts of the cold shrink three fingertips, enabling the cold shrink insulating tubes to be shrunk on the cable, and when the cold shrink insulating tubes are shrunk, lapping each cold shrink insulating tube with the last cold shrink insulating tube by more than 30mm until each phase is shrunk to the stress cone part of the lead. It should be noted that, in order to ensure insulation and protection of the cable lead, the two layers of cold shrink tubes may be shrunk, and the second layer is located at a position 30mm below the gravitational cone.
Step 4: arranging the leads of the second cable according to the internal sequence in the high-voltage cabinet;
specifically, after each cable is fixed to the cable clamp, the cables are respectively arranged in the cabinet bottom according to the standard phase sequence colors and the internal phase of the high-voltage cabinet, so that each cable lead can vertically enter the high-voltage cabinet, and the lead crossing part is reserved below the cabinet bottom.
Step 5: performing insulation treatment on the second cable and determining a cold shrink terminal installation datum point;
further, the step 5 includes:
step 5.1: a 10mm copper shield is reserved upwards at the end part of the cold shrink insulating tube of the second cable, and the rest is stripped;
step 5.2: a 20mm semiconductive layer is reserved upwards at a copper shielding fracture of the second cable, and the rest is stripped;
step 5.3, the fracture of the semiconductive layer is trimmed to form a 45-degree groove, and the groove is polished by an abrasive belt to ensure that the groove is in smooth transition with the insulation of the cable and is cleaned; the method comprises the steps of carrying out a first treatment on the surface of the
Step 5.4: the semi-conductive fracture of the second cable is downwards arranged at the cold shrink insulating tube, a preset distance (40 mm in the house and 50mm in the outdoor) is measured as a mounting datum point of the cold shrink terminal, and a PVC phase ribbon is used for making limit marks;
step 5.5: wrapping two layers with a semiconducting tape from the copper shielding fracture of the second cable to 10mm of the semiconducting layer;
step 5.6: insulation of the second cable is cut off according to the terminal hole depth (in the present invention, the terminal hole depth +5mm length is preferable), and the cable insulation break is removed from the sharp corner.
Step 6: sleeving the cold shrink terminal into the cold shrink terminal to obtain a third cable by aiming at the mounting datum point of the cold shrink terminal;
further, the step 6 specifically includes:
step 6.1: polishing the cable by using an abrasive belt to insulate and remove conductive particles on the insulating surface of the cable, and cleaning by using a cleaning towel;
step 6.2: and uniformly coating silicone grease on the insulating surface of the cable, sleeving a cold shrink terminal to align with a datum point, and pulling the support bar anticlockwise so as to shrink the support bar on the cable.
Step 7: and sleeving the wiring terminal into the wire core of the third cable, crimping the wiring terminal and sealing to finish cable installation.
Specifically, step 7 includes:
step 7.1: the connecting terminal is sleeved into the cable core, the terminal direction is confirmed according to the condition of the field equipment, and the terminal is in crimping connection. And polishing the indentation to be smooth, and cleaning the polished metal powder.
Step 7.2: winding two layers of sealant on the wiring terminal in a 1/2 lap joint manner;
step 7.3: uniformly coating silicone grease on the sealant, sleeving a cold-shrink sealing tube, and pulling the support bar anticlockwise to shrink the support bar to the end part of the cold-shrink terminal and the wiring terminal;
step 7.4: and (5) carrying out phase marking on the cold-shrink insulating tube by using a same-color PVC phase color tube according to the phase color of the cable.
Step 7.5: and manufacturing and installing the other cable ends, and installing the other cables according to the steps.
After the cable is installed, the invention also needs to test the cable head and lead the cable head, and the steps are as follows:
(1) Respectively carrying out insulation resistance, voltage withstand and partial discharge tests on the cable according to regulations;
(2) After the test is qualified, the lead is penetrated into the high-voltage cabinet according to the phase sequence color code according to the pre-lead arrangement position, and the lead is correspondingly connected and guided, so that the cable head in the cabinet is vertical;
(3) In order to prevent the cable from penetrating into the hole to damage the lead sheath, a protective sleeve and a fireproof sealing material are added at the position of the hole;
(4) And the fireproof blocking is carried out, so that the fireproof requirement is met.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the invention, for the switch cabinet with a narrow space, a cold-shrink cable head manufacturing method is innovated, and a new manufacturing and guiding method is adopted, so that the safe operation and the prolonged service life of the cold-shrink cable head can be realized, and the problems existing in the long-term operation of the cold-shrink terminal head of the crosslinked polyethylene three-core power cable in the switch cabinet are solved: 1) The difficulty of connecting and guiding a plurality of cables in a narrow space is high; 2) The cable leads are mutually crossed, and potential discharge hazards exist among the leads; 3) Stress tubes at the ends of the cold-shrink cables are stressed and easily shift to cause cable head accidents; 4) The cable bin of the high-voltage cabinet is difficult to implement fireproof blocking; 5) High accident rate of the cable head and the like.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In summary, the present description should not be construed as limiting the invention.
Claims (6)
1. The manufacturing method of the cold-shrink terminal end of the three-core high-voltage crosslinked polyethylene insulated cable is characterized by comprising the following steps of:
step 1: stripping the outer sheath, the steel armor and the inner sheath with preset lengths on the cable to obtain a pretreated cable;
step 2: respectively installing grounding wires at the steel armor and three-core copper shielding root parts of the pretreated cable, and sealing to obtain a first cable;
step 3: mounting a cold shrink three fingerstall and a cold shrink insulating tube on the first cable to obtain a second cable;
step 4: arranging the leads of the second cable according to the internal sequence in the high-voltage cabinet;
step 5: performing insulation treatment on the second cable and determining a cold shrink terminal installation datum point;
step 6: sleeving the cold shrink terminal into the cold shrink terminal to obtain a third cable by aiming at the mounting datum point of the cold shrink terminal;
step 7: and sleeving the wiring terminal into the wire core of the third cable, crimping the wiring terminal and sealing to finish cable installation.
2. The method for manufacturing the cold-shrink terminal end of the three-core high-voltage crosslinked polyethylene insulated cable according to claim 1, wherein the following steps are adopted: stripping the outer sheath, the steel armor and the inner sheath with preset lengths on the cable to obtain the pretreated cable, and the cable comprises the following components:
step 1.1: placing the cable at a preset position, straightening and leveling the end part of the cable, and cleaning the surface of the outer sheath;
step 1.2: stripping the outer sheath, the steel armor and the inner sheath of the cable, wherein the stripping length adopts the formula: s=a+b+300 mm; s represents the stripping length, A represents the splicing length of the cable bin, and B represents the length from the fixed part of the cable clamp to the bottom of the high-voltage cabinet;
step 1.3: and polishing by using an abrasive belt to remove an oxide layer and paint on the surface of the steel armor to obtain the pretreated cable.
3. The method for manufacturing the cold-shrink terminal end of the three-core high-voltage crosslinked polyethylene insulated cable according to claim 2, wherein the following step 2 is: respectively installing grounding wires at the steel armor and three-core copper shielding roots of the pretreated cable and sealing to obtain a first cable, wherein the method comprises the following steps:
step 2.1: fixing a first grounding wire on the steel armor by using a first constant force spring;
step 2.2: completely wrapping the steel armor and the first constant force spring to the 30mm position of the cable outer sheath by using an insulating self-adhesive tape, so that the first grounding wire is completely separated from the copper shield of the cable;
step 2.3: winding a second grounding wire on the root of the three-core copper shield of the cable, and fixing the second grounding wire by using a second constant force spring;
step 2.4: the three-core copper shield root, the second grounding wire and the second constant force spring of the cable are completely wrapped by insulating self-adhesive tape to the position of 30mm of the cable outer sheath.
4. A method of manufacturing a cold shrink termination end of a three-core high voltage cross-linked polyethylene insulated cable according to claim 3, wherein in step 3, a cold shrink three finger sleeve is mounted on the first cable, comprising:
step 3.1: completely wrapping three layers of filling glue at the position of 40mm from the three-phase bifurcation of the first cable to the cable outer sheath;
step 3.2: wrapping 50mm of the cable outer sheath with waterproof sealant, wrapping two layers, and sandwiching the first and second grounding wires so as to prevent moisture from penetrating along the grounding wire gaps;
step 3.3: uniformly coating a layer of silica gel on the filling adhesive, and sleeving the cold-shrink three finger sleeves into the root parts of the three-phase bifurcation ports of the cable;
step 3.4: the first grounding wire and the second grounding wire are fixed on the outer sheath of the cable by PVC phase color tapes.
5. The method for manufacturing a cold shrink terminal end of a three-core high voltage cross-linked polyethylene insulated cable according to claim 4, wherein in said step 3, mounting a cold shrink insulating tube on said first cable comprises:
and sleeving a plurality of cold-shrink insulating pipes on the three cores of the cable respectively, so that the cold-shrink insulating pipes are lapped at the root parts of the cold-shrink three fingertips, the cold-shrink insulating pipes are contracted on the cable, and when the cold-shrink insulating pipes are contracted, each cold-shrink insulating pipe is lapped with the last cold-shrink insulating pipe by more than 30mm until each phase is contracted to the stress cone part of the lead.
6. The automatic inclination angle correction method according to claim 5, wherein said step 5: performing insulation processing on the second cable and determining a cold shrink terminal installation datum point, comprising:
step 5.1: a 10mm copper shield is reserved upwards at the end part of the cold shrink insulating tube of the second cable, and the rest is stripped;
step 5.2: a 20mm semiconductive layer is reserved upwards at a copper shielding fracture of the second cable, and the rest is stripped;
step 5.3: the semiconductive layer is trimmed to a 45-degree groove, and is polished by an abrasive belt to ensure that the semiconductive layer is in smooth transition with the insulation of the cable and is cleaned;
step 5.4: the semi-conductive fracture of the second cable is downwards arranged at the cold shrink insulating tube, a preset distance is measured to be used as a mounting datum point of the cold shrink terminal, and a PVC phase ribbon is used for making limit marks;
step 5.5: wrapping two layers with a semiconducting tape from the copper shielding fracture of the second cable to 10mm of the semiconducting layer;
step 5.6: the second cable is uninsulated according to terminal Kong Shenqie and the sharp corners are removed from the cable insulation break.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310895274.0A CN117080988A (en) | 2023-07-20 | 2023-07-20 | Manufacturing method of cold-shrink terminal end of three-core high-voltage crosslinked polyethylene insulated cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310895274.0A CN117080988A (en) | 2023-07-20 | 2023-07-20 | Manufacturing method of cold-shrink terminal end of three-core high-voltage crosslinked polyethylene insulated cable |
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| Publication Number | Publication Date |
|---|---|
| CN117080988A true CN117080988A (en) | 2023-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310895274.0A Pending CN117080988A (en) | 2023-07-20 | 2023-07-20 | Manufacturing method of cold-shrink terminal end of three-core high-voltage crosslinked polyethylene insulated cable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117995468A (en) * | 2023-12-27 | 2024-05-07 | 江苏嘉盟电力设备有限公司 | Intermediate cold-shrink cable accessory for crosslinked polyethylene insulated power cable |
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2023
- 2023-07-20 CN CN202310895274.0A patent/CN117080988A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117995468A (en) * | 2023-12-27 | 2024-05-07 | 江苏嘉盟电力设备有限公司 | Intermediate cold-shrink cable accessory for crosslinked polyethylene insulated power cable |
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