CN-122026160-A - Metal isolation grounding connector for long-line high-voltage cable and mounting method

CN122026160ACN 122026160 ACN122026160 ACN 122026160ACN-122026160-A

Abstract

The invention discloses a long-line high-voltage cable metal isolation grounding connector and an installation method, wherein the grounding connector comprises a grounding metal casing, a lead sealing structure and a multifunctional wrapping layer; the grounding metal casing comprises two grounding semicircular shells sleeved on the outer side of the exposed cable metal layer, the two grounding semicircular shells are fixedly connected through a locking structure, one grounding semicircular shell is provided with a grounding lead-out terminal used for being connected with a grounding cable, the two groups of lead sealing structures are respectively arranged at two end parts of the grounding semicircular shells and are fixedly connected with the end parts of the grounding semicircular shells and the cable metal layer at the corresponding position, and the multifunctional wrapping layer wraps the outer sides of the grounding semicircular shells, the lead sealing structures and the exposed cable metal layer. The invention has the advantages of good connection reliability, good sealing performance, small space occupation and the like.

Inventors

LIN JUNYU
XIE SHENGHAI
Fan Beichen
SONG LUYU
ZENG GUOHUI
ZHANG XINGTAO
HU FEI
ZHANG JUNJIE
YAN XIFENG
ZHOU ZHIHAO
XIU CHANG
LIU ZHIHAO

Assignees

长园电力技术有限公司

Dates

Publication Date: 20260512
Application Date: 20260413

Claims (10)

1. The metal isolation grounding connector for the long-line high-voltage cable is characterized by comprising a grounding metal casing, a lead sealing structure and a multifunctional wrapping layer; the grounding metal casing comprises two grounding semicircular shells sleeved on the outer side of the exposed cable metal layer, the two grounding semicircular shells are fixedly connected through a locking structure, and one grounding semicircular shell is provided with a grounding leading-out terminal used for being connected with a grounding cable; the lead sealing structure is provided with two groups and is respectively wrapped at two end parts of the grounding semicircular shell, and the lead sealing structure is fixedly connected with the end parts of the grounding semicircular shell and the cable metal layers at corresponding positions; The multifunctional wrapping layer wraps the outer sides of the grounding semicircular shell, the lead sealing structure and the exposed cable metal layer.
2. The long-circuit high-voltage cable metal isolation grounding connector according to claim 1, wherein the locking structure comprises copper binding wires, after two grounding semicircular shells are wrapped on a bare cable metal layer, the two grounding semicircular shells are bound by the copper binding wires, after the grounding semicircular shells and the cable metal layer are sealed by lead, the copper binding wires are removed, waterproof sealing mud is uniformly smeared at the butt joint of the two grounding semicircular shells, and finally a protective layer is wound.
3. The long-line high-voltage cable metal isolation grounding connector according to claim 1, wherein the locking structure comprises two locking blocks, the two locking blocks are respectively locked at two butt joints of two grounding semicircular shells, the locking blocks are of arc structures, the circle centers of the arc structures coincide with the circle centers of the grounding semicircular shells, two dovetail guide rails are arranged on one side of a concave surface of each locking block, the dovetail guide rails are obliquely arranged compared with the length direction of each locking block, and the two dovetail guide rails are symmetrically arranged; the two dovetail grooves are symmetrical to each other at the joint of the two grounding semicircular shells and are matched with the two dovetail guide rails of the locking block.
4. The long-circuit high-voltage cable metal isolation grounding connector according to claim 1, wherein the inner side surface of the grounding metal casing is provided with a spiral groove matched with the spiral protrusion on the surface of the cable metal layer.
5. The long-circuit high-voltage cable metal isolation grounding connector according to claim 1, wherein an insulating layer is arranged on the outer side of the grounding leading-out terminal.
6. The long-circuit high-voltage cable metal isolation grounding connector according to claim 1, wherein a grounding protection layer is wrapped at the joint of the grounding lead-out terminal and the grounding cable, and comprises a temperature-resistant sealant, an insulating tape, a waterproof tape and a heat-shrinkable tube which are sequentially arranged from inside to outside.
7. The long-circuit high-voltage cable metal isolation grounding connector according to claim 1, wherein the multifunctional wrapping layer comprises a temperature-resistant sealant, an insulating tape, a waterproof tape, a heat-shrinkable wrapping tape, an armor tape and a PVC tape which are sequentially arranged from inside to outside.
8. A method for installing a long-line high-voltage cable metal isolation grounding connector as claimed in any one of claims 1 to 7, comprising the steps of: Determining the grounding position of the high-voltage cable; stripping the cable outer sheath of the high-voltage cable at the position to expose the cable metal layer; Sleeving the two grounding semicircular shells outside the exposed cable metal layer, and locking the two grounding semicircular shells by adopting a locking structure; sealing and fixing the two ends of the grounded semicircular shell with the cable metal layer by adopting a lead lining process; Respectively priming the lead sealing position of the cable metal layer by adopting an aluminum strip and a lead strip, and sealing and fixing the two ends of the grounded semicircular shell with the cable metal layer by adopting a lead sealing process; The outer sides of the grounding semicircular shell, the lead sealing structure and the exposed cable metal layer are sequentially provided with a temperature-resistant sealant, an insulating tape, a waterproof tape, a thermal shrinkage winding tape, an armor tape and a PVC tape; the grounding lead-out terminal on the cable metal layer is fixedly connected with the grounding cable, and the temperature-resistant sealant, the insulating tape, the waterproof adhesive tape and the heat shrinkage tube are sequentially arranged at the connection part of the grounding cable.
9. The method for installing a metal isolated ground joint for a long-circuit high-voltage cable according to claim 8, wherein 2 layers of temperature-resistant sealant, 6 layers of insulating tapes, 2 layers of waterproof tapes, 2 layers of heat-shrinkable wrapping tapes, 2 layers of armor tapes and 2 layers of PVC tapes are sequentially arranged on the outer sides of the grounded semicircular shell, the lead sealing structure and the exposed cable metal layer.
10. The method for installing the metal isolation grounding connector of the long-circuit high-voltage cable according to claim 8, wherein 2 layers of temperature-resistant sealant, 6 layers of insulating tapes, 2 layers of waterproof tapes and 1 layer of heat shrink tubes are sequentially arranged at the connecting position of the grounding cable.

Description

Metal isolation grounding connector for long-line high-voltage cable and mounting method Technical Field The invention relates to a high-voltage cable technology, in particular to a long-line high-voltage cable metal isolation grounding connector and an installation method. Background In high voltage ac cabling, the metallic sheath (or metallic shield) of the cable will generate voltage and circulating current due to electromagnetic induction during normal operation. In order to limit the induced voltage, reduce the circulation loss and ensure the personal safety and the equipment safety, the grounding connection points are required to be arranged on the cable lines at intervals, and the single point or the multiple points of the metal sheath are grounded. The prior art provides some technical means of metal isolating joints without breaking cables, and the technical means adopts laser welding or argon arc welding to connect a grounding leading-out shell of the joint with a cable metal layer, so as to realize direct grounding of the cable metal layer of a long line, thereby reducing the induced voltage on the cable metal layer and reducing the circulation of the cable metal layer. The outermost layer is matched with a glass fiber reinforced plastic outer protection box according to the joint waterproof requirement, and high-performance insulating waterproof sealing double-component glue is poured into the shell, so that the product has corresponding mechanical protection, flame retardance and waterproof sealing performance. The technical means of the metal isolating joint has the following defects: 1. the grounding leading-out shell of the connector is fixedly connected with the cable metal layer in a welding mode, the mechanical strength and the long-term vibration resistance and tensile resistance of the grounding leading-out shell are limited, and when the cable is influenced by external force or expansion and contraction during operation, the connection point can be loose or even lose efficacy, so that poor grounding is caused. 2. The glass fiber reinforced plastic outer protection box is additionally arranged on the high-voltage cable metal isolation intermediate joint for waterproof sealing, but the waterproof outer box is large in size and is not suitable for places such as a pipe gallery with limited space, if the glass fiber reinforced plastic outer protection box is not arranged, the existing sealing structure possibly fails in a long-term water immersion or high-pressure environment. Disclosure of Invention The invention aims to overcome the problems and provide the metal isolation grounding connector for the long-line high-voltage cable, which has the advantages of good connection reliability, good sealing performance, small space occupation and the like. Another object of the present invention is to provide a method for installing a long-line high-voltage cable metal isolated ground connector. The aim of the invention is achieved by the following technical scheme: a metal isolation grounding connector of a long-line high-voltage cable comprises a grounding metal casing, a lead sealing structure and a multifunctional wrapping layer; the grounding metal casing comprises two grounding semicircular shells sleeved on the outer side of the exposed cable metal layer, the two grounding semicircular shells are fixedly connected through a locking structure, and one grounding semicircular shell is provided with a grounding leading-out terminal used for being connected with a grounding cable; the lead sealing structure is provided with two groups and is respectively wrapped at two end parts of the grounding semicircular shell, and the lead sealing structure is fixedly connected with the end parts of the grounding semicircular shell and the cable metal layers at corresponding positions; The multifunctional wrapping layer wraps the outer sides of the grounding semicircular shell, the lead sealing structure and the exposed cable metal layer. According to a preferred scheme, the locking structure comprises copper binding wires, after two grounding semicircular shells are wrapped on a bare cable metal layer, the two grounding semicircular shells are bound by the copper binding wires, the copper binding wires are removed after the grounding semicircular shells and the cable metal layer are sealed by lead, watertight sealing mud is uniformly smeared at the joint of the two grounding semicircular shells, and finally a protective layer is wound. The fixing mode is simple and convenient to operate, low in cost and suitable for specific occasions. According to one preferable scheme, the locking structure comprises two locking blocks, the two locking blocks are respectively locked at two butt joints of two grounding semicircular shells, the locking blocks are of arc-shaped structures, the circle centers of the arc-shaped structures coincide with the circle centers of the grounding semicircular shells, two dovetail gui