Shielding structure of high-voltage cable head and manufacturing method

Abstract

The invention provides a shielding structure of a high-voltage cable head and a manufacturing method, and relates to the technical field of high-voltage cables, a semi-conductive PE belt is wrapped on a transition section and a cable main insulating layer to form a semi-conductive PE layer, a semi-conductive C belt is wrapped on a cable outer semi-conductive layer and the semi-conductive PE layer to form a semi-conductive C belt layer, and the semi-conductive C belt layer covers the transition section. The semi-conductive C belt layer is wrapped with a shielding metal net and extends to the tin-plated annealed copper wire to form a shielding metal net layer, the surface of the shielding metal net layer is wrapped with an adhesive PVC adhesive tape to form an adhesive PVC adhesive tape layer, the upper end of the adhesive PVC adhesive tape layer does not exceed the upper end of the semi-conductive C belt layer, and the adhesive PVC adhesive tape layer covers the transition section so as to shield electromagnetic interference. The high-voltage cable head solves the problem that the service life of an existing high-voltage cable head is affected due to electromagnetic interference, and is suitable for electromagnetic shielding of the high-voltage cable head.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage cables, and in particular to a shielding structure and a manufacturing method of a high-voltage cable head. Background Art

[0002] Large hydropower stations are mostly located in high mountain valleys. High voltage is often at a 500kV level. 500kV transformers are arranged in underground powerhouses, 500kV high-voltage cables are arranged in outgoing line shafts, and 500kV GIS switch stations are arranged on the ground. The 500kV high-voltage cables need to be connected to GIS equipment. After the cable laying and GIS equipment installation are completed, 500kV high-voltage cable heads need to be processed and manufactured on-site. However, current high-voltage cable heads are shielded, and some have internal and external electromagnetic interference, resulting in an unbalanced electromagnetic field transition across the cable heads, impacting the service life of the cables. Summary of the Invention

[0003] Technical problem solved by the present invention: The present invention provides a shielding structure and a manufacturing method for a high-voltage cable head, which solves the problem that the existing high-voltage cable head has electromagnetic interference, thereby affecting its service life.

[0004] The present invention solves the above-mentioned technical problems by adopting a technical solution: a shielding structure of a high-voltage cable head, wherein the high-voltage cable head includes a cable corrugated aluminum sheath layer, a cable outer semi-conductive layer, a cable main insulation layer, and a transition section located between the cable outer semi-conductive layer and the cable main insulation layer, and a tinned soft copper wire with a fixed grounding unit is provided on the cable corrugated aluminum sheath layer, and the shielding structure includes: a semi-conductive PE layer, a semi-conductive C tape layer, a shielding metal mesh layer and a sticky PVC tape layer; the semi-conductive PE layer is formed by wrapping a semi-conductive PE tape on the transition section and the cable main insulation layer; the semi-conductive C tape layer is formed by wrapping a semi-conductive C tape on the cable outer semi-conductive layer and the semi-conductive PE layer, and the semi-conductive C tape layer covers the transition section; the shielding metal mesh layer is formed by wrapping a shielding metal mesh on the semi-conductive C tape layer and extending it to the tinned soft copper wire; the sticky PVC tape layer is formed by wrapping a sticky PVC tape on the surface of the shielding metal mesh layer, the upper end of the sticky PVC tape layer does not exceed the upper end of the semi-conductive C tape layer, and the sticky PVC tape layer covers the transition section.

[0005] Furthermore, the transition section is subjected to a chamfer grinding process.

[0006] The present invention also provides a method for manufacturing a shielding structure of a high-voltage cable head, which is applied to the shielding structure of the above-mentioned high-voltage cable head. The manufacturing method comprises the following steps:

[0007] S1. Wrap the semi-conductive PE tape on the transition section and the main insulation layer of the cable to form a semi-conductive PE layer;

[0008] S2. Wrapping a semiconductive C tape on the outer semiconductive layer and the semiconductive PE layer of the cable to form a semiconductive C tape layer, wherein the semiconductive C tape layer covers the transition section;

[0009] S3, wrapping a shielding metal mesh on the semi-conductive C-tape layer and extending it to the tinned soft copper wire to form a shielding metal mesh layer;

[0010] S4. Wrapping the surface of the shielding metal mesh layer 8 with a sticky PVC tape to form a sticky PVC tape layer. The upper end of the sticky PVC tape layer does not exceed the upper end of the semi-conductive C tape layer. The sticky PVC tape layer covers the transition section.

[0011] Furthermore, the transition section is subjected to a chamfer grinding process.

[0012] Beneficial effects of the present invention: The present invention provides a shielding structure and manufacturing method for a high-voltage cable head, which forms a semi-conductive PE layer by wrapping a semi-conductive PE tape on the transition section and the main insulation layer of the cable, and forms a semi-conductive C tape layer by wrapping a semi-conductive C tape on the outer semi-conductive layer of the cable and the semi-conductive PE layer, and the semi-conductive C tape layer covers the transition section, and a shielding metal mesh is wrapped on the semi-conductive C tape layer and extends to the tinned soft copper wire to form a shielding metal mesh layer, and a sticky PVC tape is wrapped on the surface of the shielding metal mesh layer to form a sticky PVC tape layer, the upper end of the sticky PVC tape layer does not exceed the upper end of the semi-conductive C tape layer, and the sticky PVC tape layer covers the transition section, thereby shielding electromagnetic interference and solving the problem that the existing high-voltage cable head has electromagnetic interference, thereby affecting its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the shielding structure of a high-voltage cable head provided by the present invention, wherein 1 represents the corrugated aluminum sheath layer of the cable, 2 represents the tinned soft copper wire of the fixed grounding unit, 3 represents the outer semi-conductive layer of the cable, 4 represents the main insulation layer of the cable, 5 represents the semi-conductive PE layer, 6 represents the transition section between the outer semi-conductive layer of the cable and the main insulation layer of the cable, 7 represents the semi-conductive C-tape layer, 8 represents the shielding metal mesh layer, and 9 represents the sticky PVC tape layer. DETAILED DESCRIPTION

[0014] The present invention provides a shielding structure for a high-voltage cable head and a manufacturing method thereof, which is a part of the manufacturing and installation of the cable head at the terminal where the high-voltage cable is connected to other equipment. Through reliable design and complete technology, the electromagnetic field at the cable head terminal is guaranteed to have a balanced transition, which can effectively block external electromagnetic interference from entering the interior of the cable head. At the same time, it can also reduce the impact of the electromagnetic field inside the cable head on external equipment and the environment, thereby extending the service life of the cable.

[0015] The shielding structure of the high-voltage cable head provided by the present invention is as follows: Figure 1As shown, the high-voltage cable head includes a cable corrugated aluminum sheath layer 1, a cable outer semi-conductive layer 3, a cable main insulation layer 4, and a transition section 6 located between the cable outer semi-conductive layer 3 and the cable main insulation layer 4. A tinned soft copper wire 2 with a fixed grounding unit is provided on the cable corrugated aluminum sheath layer 1. The shielding structure includes: a semi-conductive PE layer 5, a semi-conductive C tape layer 7, a shielding metal mesh layer 8 and an adhesive PVC tape layer 9; the semi-conductive PE layer 5 is formed by wrapping the semi-conductive PE tape on the transition section 6 and the cable main insulation layer 4; A semiconductive C tape is wrapped around the outer semiconductive layer 3 and the semiconductive PE layer 5 of the cable to form a semiconductive C tape layer 7, and the semiconductive C tape layer 7 covers the transition section 6; a shielding metal mesh is wrapped around the semiconductive C tape layer 7 and extended to the tinned soft copper wire 2 to form a shielding metal mesh layer 8; a sticky PVC tape layer 9 is formed by wrapping the surface of the shielding metal mesh layer 8, the upper end of the sticky PVC tape layer 9 does not exceed the upper end of the semiconductive C tape layer 7, and the sticky PVC tape layer 9 covers the transition section.

[0016] In particular, the transition section 6 is subjected to a chamfer grinding process.

[0017] The present invention also provides a method for manufacturing a shielding structure of a high-voltage cable head, which is applied to the shielding structure of the high-voltage cable head described above. The manufacturing method comprises the following steps:

[0018] S1. Wrap a semi-conductive PE tape on the transition section 6 and the main insulation layer 4 of the cable to form a semi-conductive PE layer 5. Specifically, wrap the semi-conductive PE tape in a reciprocating 1 / 2 covering manner.

[0019] S2. Wrap a semiconductive C tape on the outer semiconductive layer 3 and the semiconductive PE layer 5 of the cable to form a semiconductive C tape layer 7, and the semiconductive C tape layer 7 covers the transition section 6; specifically, wrap the semiconductive C tape in a single direction from top to bottom with 1 / 2 coverage.

[0020] S3. Wrap a shielding metal mesh on the semi-conductive C-tape layer 7 and extend it to the tinned soft copper wire 2 to form a shielding metal mesh layer 8; specifically, wrap the shielding metal mesh in a single direction from top to bottom with 1 / 2 coverage.

[0021] S4. Wrap the sticky PVC tape on the surface of the shielding metal mesh layer 8 to form a sticky PVC tape layer 9. The upper end of the sticky PVC tape layer 9 does not exceed the upper end of the semi-conductive C tape layer 7, and the sticky PVC tape layer 9 covers the transition section. Specifically, wrap the sticky PVC tape from bottom to top and then to bottom, and wrap it back and forth in a 1 / 2 coverage manner.

[0022] Furthermore, the transition section 6 is subjected to a chamfer grinding process.

Claims

1. A shielding structure for a high-voltage cable head, comprising a cable corrugated aluminum sheath layer, a cable outer semi-conductive layer, a cable main insulation layer, and a transition section between the cable outer semi-conductive layer and the cable main insulation layer, wherein a tinned soft copper wire having a fixed grounding unit is provided on the cable corrugated aluminum sheath layer, characterized in that: The shielding structure includes: a semi-conductive PE layer, a semi-conductive C-tape layer, a shielding metal mesh layer and a sticky PVC tape layer; the semi-conductive PE layer is formed by wrapping the semi-conductive PE tape on the transition section and the main insulation layer of the cable; the semi-conductive C-tape layer is formed by wrapping the semi-conductive C-tape on the outer semi-conductive layer of the cable and the semi-conductive PE layer, and the semi-conductive C-tape layer covers the transition section; the shielding metal mesh layer is formed by wrapping the shielding metal mesh on the semi-conductive C-tape layer and extending it to the tinned soft copper wire; the sticky PVC tape layer is formed by wrapping the sticky PVC tape on the surface of the shielding metal mesh layer, the upper end of the sticky PVC tape layer does not exceed the upper end of the semi-conductive C-tape layer, and the sticky PVC tape layer covers the transition section.

2. The shielding structure of the high-voltage cable head according to claim 1, characterized in that: The transition section is subjected to a chamfer grinding process.

3. A method for manufacturing a shielding structure of a high-voltage cable head, characterized in that: The shielding structure applied to the high-voltage cable head according to claim 1, wherein the manufacturing method comprises the following steps: S1, wrapping a semi-conductive PE tape on the transition section 6 and the main insulation layer 4 of the cable to form a semi-conductive PE layer 5; S2. Wrapping a semiconductive C tape on the outer semiconductive layer 3 and the semiconductive PE layer 5 of the cable to form a semiconductive C tape layer 7, wherein the semiconductive C tape layer 7 covers the transition section 6; S3, wrapping a shielding metal mesh on the semi-conductive C-tape layer 7 and extending it to the tinned soft copper wire 2 to form a shielding metal mesh layer 8; S4. Wrap the surface of the shielding metal mesh layer 8 with a sticky PVC tape to form a sticky PVC tape layer 9. The upper end of the sticky PVC tape layer 9 does not exceed the upper end of the semi-conductive C tape layer 7. The sticky PVC tape layer 9 covers the transition section.

4. The method for manufacturing a shielding structure of a high-voltage cable head according to claim 3, characterized in that: The transition section is subjected to a chamfer grinding process.

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