Lead sealing structure and method for protection fitting of high-voltage cable head

Abstract

The invention provides a protection fitting lead sealing structure and method for a high-voltage cable head, and relates to the technical field of high-voltage cables. Comprising a high-voltage single-core cable, a cable corrugated aluminum sheath layer, a protection fitting, a grounding terminal, a viscous PCV adhesive tape layer, a thermal shrinkable sleeve layer, a waterproof tape layer, an insulating self-adhesive tape layer, a lead sealing layer, a sealing tape layer, a tinned soft copper wire, a tinned soft copper woven mesh, a lead sheath and a tinned soft copper marshalling wire. The corrugated aluminum sheath layer of the cable is well grounded, the service life of the cable is prolonged, long-term reliable and safe operation of the cable is guaranteed, the problem that an existing high-voltage cable head is low in reliability is solved, and the high-voltage cable head protection fitting lead sealing method is suitable for high-voltage cable head protection fitting lead sealing.

Description

Technical Field

[0001] The present invention relates to the technical field of high - voltage cables, and particularly to a lead - sealing structure and method for protective fittings of high - voltage cable heads. Background Art

[0002] Most large - scale hydropower stations are located in alpine and canyon areas. High voltage often adopts a 500kV voltage level. 500kV transformers are arranged in underground powerhouses, 500kV high - voltage cables are arranged in outlet shafts, and 500kV GIS switchyards are arranged on the ground. The 500kV high - voltage cables are connected to GIS equipment. After the cable laying and GIS equipment installation are completed, it is necessary to fabricate 500kV high - voltage cable heads on site. At present, some high - voltage cable heads often have problems such as water seepage, dust entry, and corrosion due to imperfect design structures and manufacturing processes, and their reliability is relatively low. Summary of the Invention

[0003] The technical problem to be solved by the present invention: The present invention provides a lead - sealing structure and method for protective fittings of high - voltage cable heads to solve the problem of relatively low reliability of existing high - voltage cable heads.

[0004] The technical solution adopted by the present invention to solve the above - mentioned technical problem: The lead - sealing structure of the protective fittings of the high - voltage cable head includes a high - voltage single - core cable, a corrugated aluminum sheath layer of the cable, a protective fitting, a grounding terminal, a sticky PCV tape layer, a heat - shrinkable sleeve layer, a waterproof tape layer, an insulating self - adhesive tape layer, a lead - sealing layer, a sealing tape layer, a tinned soft copper wire, a tinned soft copper braided mesh, a lead sheet, and a tinned soft copper braided wire;

[0005] One end of the tinned soft copper braided wire is tied to the corrugated aluminum sheath layer of the cable by a tinned soft copper wire, and there is a reserved part at one end of the tinned soft copper braided wire, which is tinned. The other end of the tinned soft copper braided wire is crimped to the grounding terminal;

[0006] A lead sheet is attached above the reserved part, and the front end of the protective fitting is attached above the lead sheet. A lead bar is used to wind and attach the front end of the protective fitting, the lead sheet, and the reserved part to the corrugated aluminum sheath layer of the cable to form a lead - sealing layer;

[0007] One end of the tinned soft copper braided mesh is tied to the corrugated aluminum sheath layer of the cable by a tinned soft copper wire and is tinned. The other end of the tinned soft copper braided mesh is tied to the front - end surface of the cable terminal protective fitting by a tinned soft copper wire and is tinned, so that the tinned soft copper braided mesh wraps the lead - sealing layer;

[0008] An adhesive cleaner is applied to the tinned soft copper braided mesh, and an insulating self - adhesive tape is wrapped and extended to wind around the high - voltage single - core cable to form an insulating self - adhesive tape layer;

[0009] Sealing tapes are wrapped at both ends of the insulating self - adhesive tape layer to form a sealing tape layer;

[0010] Wrap a waterproof tape outside the insulating self-adhesive tape layer and the sealing tape layer to form a waterproof tape layer;

[0011] Slip a heat shrink sleeve over the surface of the waterproof tape layer, and use a hot air blower to heat it so that the heat shrink sleeve fits tightly against the waterproof tape to form a heat shrink sleeve layer;

[0012] Wrap a sticky PVC tape around both ends of the heat shrink sleeve layer to form a sticky PCV tape layer.

[0013] Furthermore, the lead strip is wound into an apple shape.

[0014] The present invention also provides a method for sealing lead of a protective fitting for a high-voltage cable head, which is applied to the protective fitting for a high-voltage cable head with the sealing lead structure as described above. The method includes the following steps:

[0015] S1. Bind one end of the tinned soft copper braided wire to the corrugated aluminum sheath layer of the cable with a tinned soft copper wire, and make sure there is a reserved part at one end of the tinned soft copper braided wire, and then tin it. The other end of the tinned soft copper braided wire is crimped to the grounding terminal;

[0016] S2. Fit a lead sheet above the reserved part, fit the front end of the protective fitting above the lead sheet, and use a lead strip to wind and fit the front end of the protective fitting, the lead sheet and the reserved part on the corrugated aluminum sheath layer of the cable to form a lead seal layer;

[0017] S3. Bind one end of the tinned soft copper braided mesh to the corrugated aluminum sheath layer of the cable with a tinned soft copper wire and tin it. The other end of the tinned soft copper braided mesh is bound to the surface of the front end of the cable terminal protective fitting with a tinned soft copper wire and tinned, so that the tinned soft copper braided mesh wraps the lead seal layer;

[0018] S4. Apply an adhesive cleaner on the tinned soft copper braided mesh, wrap an insulating self-adhesive tape, and extend the winding to the high-voltage single-core cable to form an insulating self-adhesive tape layer;

[0019] S5. Wrap a sealing tape around both ends of the insulating self-adhesive tape layer to form a sealing tape layer;

[0020] S6. Wrap a waterproof tape outside the insulating self-adhesive tape layer and the sealing tape layer to form a waterproof tape layer;

[0021] S7. Slip a heat shrink sleeve over the surface of the waterproof tape layer, and use a hot air blower to heat it so that the heat shrink sleeve fits tightly against the waterproof tape to form a heat shrink sleeve layer;

[0022] S8. Wrap a sticky PVC tape around both ends of the heat shrink sleeve layer to form a sticky PCV tape layer.

[0023] Furthermore, the lead strip is wound into an apple shape.

[0024] Advantages of the present invention: The present invention provides a lead-sealing structure and method for a protective fitting of a high-voltage cable head. One end of a tinned soft copper braided wire is tied to the corrugated aluminum sheath layer of the cable through a tinned soft copper wire, and a reserved part exists at one end of the tinned soft copper braided wire, which is tinned. The other end of the tinned soft copper braided wire is crimped to a grounding terminal. A lead sheet is attached above the reserved part, and the front end of the protective fitting is attached above the lead sheet. A lead strip is used to wind and attach the front end of the protective fitting, the lead sheet, and the reserved part to the corrugated aluminum sheath layer of the cable to form a lead-sealing layer. One end of a tinned soft copper woven mesh is tied to the corrugated aluminum sheath layer of the cable through a tinned soft copper wire and tinned. The other end of the tinned soft copper woven mesh is tied to the front surface of the front end of the cable terminal protective fitting through a tinned soft copper wire and tinned, so that the tinned soft copper woven mesh wraps the lead-sealing layer. An adhesive cleaner is applied to the tinned soft copper woven mesh, and an insulating self-adhesive tape is wrapped and extended to wind around the high-voltage single-core cable to form an insulating self-adhesive tape layer. Sealing tapes are wrapped at both ends of the insulating self-adhesive tape layer to form a sealing tape layer. A waterproof tape is wrapped outside the insulating self-adhesive tape layer and the sealing tape layer to form a waterproof tape layer. A heat shrinkable sleeve is put on the surface of the waterproof tape layer, and the heat shrinkable sleeve is heated by hot air to make it tightly fit the waterproof tape to form a heat shrinkable sleeve layer. Adhesive PVC tapes are wrapped at both ends of the heat shrinkable sleeve layer to form an adhesive PCV tape layer. In this way, problems such as water seepage, dust entry, and corrosion are overcome, and the problem of low reliability of the existing high-voltage cable head is solved. Description of the Drawings

[0025] Figure 1 FIG. is a schematic diagram of a lead-sealing structure of a protective fitting for a high-voltage cable head provided by the present invention. Among them, 1 represents a high-voltage single-core cable, 2 represents a corrugated aluminum sheath layer of the cable, 3 represents a cable insulation layer, 4 represents a protective fitting, 5 represents a grounding terminal, 6 represents an adhesive PCV tape layer, 7 represents a heat shrinkable sleeve layer, 8 represents a waterproof tape layer, 9 represents an insulating self-adhesive tape layer, 10 represents a lead-sealing layer, 11 represents a sealing tape layer, 12 represents a tinned soft copper wire, 13 represents a tinned soft copper woven mesh, 14 represents a lead sheet, and 15 represents a tinned soft copper braided wire. Detailed Embodiments

[0026] The lead-sealing structure and method for a protective fitting of a high-voltage cable head provided by the present invention are part of the manufacture and installation of a cable head for connecting a high-voltage cable to other equipment. Through reliable design and complete processes, the waterproof, dustproof, and corrosion-proof properties of the cable head are ensured, and the corrugated aluminum sheath layer of the cable is well grounded, extending the service life of the cable and ensuring the long-term reliable and safe operation of the cable, solving the problem of low reliability of the existing high-voltage cable head.

[0027] Such as Figure 1As shown in the figure, the present invention provides a lead sealing structure for a protective fitting of a high-voltage cable head, which includes a high-voltage single-core cable 1, a corrugated aluminum sheath layer 2 of the cable, a cable insulation layer 3, a protective fitting 4, a grounding terminal 5, a sticky PCV tape layer 6, a heat-shrinkable sleeve layer 7, a waterproof tape layer 8, an insulating self-adhesive tape layer 9, a lead sealing layer 10, a sealing tape layer 11, a tinned soft copper wire 12, a tinned soft copper braided mesh 13, a lead sheet 14, and a tinned soft copper braided wire 15. Among them, when the cable factory produces, the corrugated aluminum sheath layer 2 and the cable insulation layer 3 of the cable are extruded on the copper core in layers.

[0028] One end of the tinned soft copper braided wire 15 is tied to the corrugated aluminum sheath layer 2 of the cable through the tinned soft copper wire 12, and there is a reserved part at one end of the tinned soft copper braided wire 15, which is tinned, and the other end of the tinned soft copper braided wire 15 is crimped to the grounding terminal 5.

[0029] The lead sheet 14 is attached above the reserved part, and the front end of the protective fitting 4 is attached above the lead sheet 14, and a lead strip is used to wind and attach the front end of the protective fitting 4, the lead sheet 14, and the reserved part to the corrugated aluminum sheath layer 2 of the cable to form a lead sealing layer 10. Specifically, the lead strip is wound into an apple shape, that is, the lead sealing layer 10 is also in an apple shape.

[0030] One end of the tinned soft copper braided mesh 13 is tied to the corrugated aluminum sheath layer 2 of the cable through the tinned soft copper wire 12 and is tinned, and the other end of the tinned soft copper braided mesh 13 is tied to the surface of the front end of the cable terminal protective fitting 4 through the tinned soft copper wire 12 and is tinned, so that the tinned soft copper braided wire 13 wraps the lead sealing layer 10.

[0031] A sticky agent is applied to the tinned soft copper braided mesh 13, and an insulating self-adhesive tape is wrapped and extended to wind around the high-voltage single-core cable 1 to form an insulating self-adhesive tape layer 9.

[0032] Sealing tapes are wrapped at both ends of the insulating self-adhesive tape layer 9 to form a sealing tape layer 11.

[0033] A waterproof tape is wrapped outside the insulating self-adhesive tape layer 9 and the sealing tape layer 11 to form a waterproof tape layer 8.

[0034] A heat-shrinkable sleeve is put on the surface of the waterproof tape layer 8, and the heat-shrinkable sleeve is heated with a hot air blower to make it tightly adhere to the waterproof tape to form a heat-shrinkable sleeve layer 7.

[0035] Sticky PVC tapes are wrapped at both ends of the heat-shrinkable sleeve layer 7 to form a sticky PCV tape layer 6.

[0036] The present invention also provides a method for lead sealing of a protective fitting of a high-voltage cable head, which is applied to the lead sealing structure of the protective fitting of the high-voltage cable head described above. The method includes the following steps:

[0037] S1. Use tinned soft copper wire 12 to tie one end of the tinned soft copper braided wire 15 to the corrugated aluminum sheath layer 2 of the cable, and leave a reserved part at one end of the tinned soft copper braided wire 15, then tin it. The other end of the tinned soft copper braided wire 15 is crimped to the grounding terminal 5.

[0038] S2. Fit the lead sheet 14 above the reserved part, fit the front end of the protective fitting 4 above the lead sheet 14, and use a lead strip to wind and fit the front end of the protective fitting 4, the lead sheet 14 and the reserved part on the corrugated aluminum sheath layer 2 of the cable to form a lead seal layer 10; the lead strip is wound into an apple shape, that is, the lead seal layer 10 is also in an apple shape.

[0039] S3. Use tinned soft copper wire 12 to tie one end of the tinned soft copper braided mesh 13 to the corrugated aluminum sheath layer 2 of the cable and tin it. The other end of the tinned soft copper braided mesh 13 is tied to the surface of the front end of the cable terminal protective fitting 4 through the tinned soft copper wire 12 and tin it, so that the tinned soft copper braided wire 13 wraps the lead seal layer 10.

[0040] S4. Apply an adhesive cleaner on the tinned soft copper braided mesh 13, wrap an insulating self-adhesive tape, and extend the winding to the high-voltage single-core cable 1 to form an insulating self-adhesive tape layer 9. Specifically, the insulating self-adhesive tape is wrapped in a 2 - time reciprocating 1 / 2 covering manner.

[0041] S5. Wrap a sealing tape at both ends of the insulating self-adhesive tape layer 9 to form a sealing tape layer 11. Specifically, the sealing tape is wrapped in a 1 - layer 1 / 2 covering manner.

[0042] S6. Wrap a waterproof tape outside the insulating self-adhesive tape layer 9 and the sealing tape layer 11 to form a waterproof tape layer 8. Specifically, the waterproof tape is wrapped in a 1 - time reciprocating 1 / 2 covering manner.

[0043] S7. Put a heat shrinkable sleeve on the surface of the waterproof tape layer 8, and use a hot air blower to heat it to make the heat shrinkable sleeve tightly adhere to the waterproof tape, forming a heat shrinkable sleeve layer 7.

[0044] S8. Wrap a sticky PVC tape at both ends of the heat shrinkable sleeve layer 7 to form a sticky PCV tape layer 6. Specifically, the sticky PVC tape is wrapped in a 2 - time reciprocating 1 / 2 covering manner.

Claims

1. The lead sealing structure of the protective fitting for a high-voltage cable head, characterized in that, It includes a high-voltage single-core cable, a corrugated aluminum sheath layer of the cable, protective fittings, a grounding terminal, a viscous PCV tape layer, a heat-shrinkable sleeve layer, a waterproof tape layer, an insulating self-adhesive tape layer, a lead seal layer, a sealing tape layer, tinned soft copper wire, a tinned soft copper braided mesh, lead sheet and a tinned soft copper braided wire; One end of the tinned soft copper braided wire is tied to the corrugated aluminum sheath layer of the cable by the tinned soft copper wire, and there is a reserved part at one end of the tinned soft copper braided wire, and it is tinned. The other end of the tinned soft copper braided wire is crimped to the grounding terminal; The lead sheet is attached above the reserved part, and the front end of the protective fitting is attached above the lead sheet, and the front end of the protective fitting, the lead sheet and the reserved part are attached to the corrugated aluminum sheath layer of the cable by winding with a lead bar to form a lead seal layer; One end of the tinned soft copper braided mesh is tied to the corrugated aluminum sheath layer of the cable by the tinned soft copper wire and is tinned. The other end of the tinned soft copper braided mesh is tied to the front surface of the front end of the cable terminal protective fitting by the tinned soft copper wire and is tinned, so that the tinned soft copper braided mesh wraps the lead seal layer; An adhesive is applied to the tinned soft copper braided mesh, and an insulating self-adhesive tape is wrapped and extended to wind around the high-voltage single-core cable to form an insulating self-adhesive tape layer; Sealing tapes are wrapped at both ends of the insulating self-adhesive tape layer to form a sealing tape layer; A waterproof tape is wrapped outside the insulating self-adhesive tape layer and the sealing tape layer to form a waterproof tape layer; A heat-shrinkable sleeve is put on the surface of the waterproof tape layer, and the heat-shrinkable sleeve is heated by hot air to make it tightly fit the waterproof tape to form a heat-shrinkable sleeve layer; Viscous PVC tapes are wrapped at both ends of the heat-shrinkable sleeve layer to form a viscous PCV tape layer.

2. The lead-sealing structure of the protective fitting for a high-voltage cable head according to claim 1, characterized in that, The lead bar is wound into an apple shape.

3. The lead sealing method for the protective fitting of the high-voltage cable head is applied to the lead sealing structure of the protective fitting of the high-voltage cable head as described in claim 1, and is characterized in that, The method includes the following steps: S1. Tie one end of the tinned soft copper braided wire to the corrugated aluminum sheath layer of the cable with the tinned soft copper wire, so that there is a reserved part at one end of the tinned soft copper braided wire, and it is tinned. The other end of the tinned soft copper braided wire is crimped to the grounding terminal; S2. Attach the lead sheet above the reserved part, attach the front end of the protective fitting above the lead sheet, and wind the front end of the protective fitting, the lead sheet and the reserved part to the corrugated aluminum sheath layer of the cable with a lead bar to form a lead seal layer; S3. Tie one end of the tinned soft copper braided mesh to the corrugated aluminum sheath layer of the cable with the tinned soft copper wire and tin it. The other end of the tinned soft copper braided mesh is tied to the front surface of the front end of the cable terminal protective fitting with the tinned soft copper wire and tinned, so that the tinned soft copper braided mesh wraps the lead seal layer; S4. Apply an adhesive to the tinned soft copper braided mesh, wrap an insulating self-adhesive tape and extend it to wind around the high-voltage single-core cable to form an insulating self-adhesive tape layer; S5. Wrap sealing tapes at both ends of the insulating self-adhesive tape layer to form a sealing tape layer; S6. Wrap a waterproof tape outside the insulating self-adhesive tape layer and the sealing tape layer to form a waterproof tape layer; S7. Put a heat-shrinkable sleeve on the surface of the waterproof tape layer, and heat the heat-shrinkable sleeve with hot air to make it tightly fit the waterproof tape to form a heat-shrinkable sleeve layer; S8. Wrap viscous PVC tapes at both ends of the heat-shrinkable sleeve layer to form a viscous PCV tape layer.

4. The lead sealing method for the protective fitting of the high-voltage cable head according to claim 3, characterized in that, The lead bar is wound into an apple shape.

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