CN-122025275-A - Lightning protection overhead insulated cable based on composite shielding structure

CN122025275ACN 122025275 ACN122025275 ACN 122025275ACN-122025275-A

Abstract

The invention relates to the technical field of cables and discloses a lightning protection overhead insulated cable based on a composite shielding structure, wherein an elastic energy storage sheet, a high-conductivity graphite composite strip and a self-healing capsule are arranged, the elastic energy storage sheet is in a bending state in a normal state, when a lightning stroke suffered by the lightning exceeds a tolerance threshold value, the high-conductivity graphite composite strip is pulverized, then the elastic energy storage sheet starts to rebound and straighten, a connecting cable is used for tearing a prefabricated tearing opening, conductive polyurethane prepolymer repair liquid containing ten percent of graphite micropowder in a capsule chamber is mixed with a polyurethane latent curing agent and flows out, and a continuous conductive composite layer is formed after crosslinking polymerization and solidification, so that a lightning protection path is repaired, meanwhile, a basalt fiber protection network is used for restraining pulverized graphite fragments, a connecting base plate synchronously acts to accelerate medium release, autonomous recovery of the lightning protection performance of the cable is realized, power failure is not required to replace the cable, the operation and maintenance cost is greatly reduced, and the power supply continuity is improved.

Inventors

YAN JIPENG
JIAO YUNFU
WANG ZHONGYU
TAO JIALIN
LI BO

Assignees

锐洋集团东北电缆有限公司

Dates

Publication Date: 20260512
Application Date: 20260401

Claims (10)

1. The lightning protection overhead insulated cable based on the composite shielding structure is characterized by comprising a cable conductor, wherein an insulating layer surrounds the outer wall of the cable conductor, a self-healing layer surrounds the outer wall of the insulating layer, a repairing liquid sac chamber is fixedly connected to the inner side of the self-healing layer, a separation layer is fixedly connected to the side of the repairing liquid sac chamber, a curing agent sac chamber is fixedly connected to the other side of the separation layer, a connecting cable is fixedly connected to the inner side of the separation layer, a connecting bottom plate is fixedly connected to the bottom of the connecting cable, a prefabricated tearing opening is fixedly connected to the outer wall of the connecting cable, an elastic energy storage sheet is fixedly connected to the top of the connecting cable, a high-conductivity graphite composite strip is tightly attached to the top of the elastic energy storage sheet, an aluminum-clad steel lightning protection wire weaving section is tightly attached to the side of the elastic energy storage sheet, a basalt fiber protection net is fixedly connected to the outer wall of the aluminum-clad steel wire weaving section, and a rubber sheath is encircled by the outer wall of the basalt fiber protection net.
2. The lightning protection overhead insulated cable based on the composite shielding structure of claim 1, wherein the curing agent bag chamber and the self-healing layer are fixedly connected, and the curing agent bag chamber and the repairing liquid bag chamber are symmetrically arranged about the vertical central axis of the separation layer.
3. The lightning protection overhead insulated cable based on the composite shielding structure of claim 1, wherein the repair liquid capsule chamber, the separation layer and the curing agent capsule chamber are combined to form a self-healing capsule, and the self-healing capsule is arranged at equal intervals relative to the inside of the self-healing layer.
4. The lightning protection overhead insulated cable based on the composite shielding structure of claim 1, wherein the repair liquid sac is internally packaged with conductive polyurethane prepolymer repair liquid containing ten percent of graphite micropowder, and the curing agent sac is internally packaged with polyurethane latent curing agent.
5. The lightning protection overhead insulated cable based on the composite shielding structure of claim 1, wherein the repair liquid capsule chamber and the curing agent capsule chamber are of a double-cavity connected capsule structure, and the prefabricated tearing opening is a weak tearing line shared by the two cavities.
6. The lightning protection overhead insulated cable based on the composite shielding structure of claim 1, wherein the elastic energy storage sheet is made of a semi-conductive elastic stainless steel sheet, and the elastic energy storage sheet is arranged in an arc shape.
7. The lightning protection overhead insulated cable based on the composite shielding structure of claim 1, wherein one end of the elastic energy storage piece is fixed on one side of the aluminum-clad steel lightning protection wire braiding section, and the other end of the elastic energy storage piece is erected on the inner side of the other side of the aluminum-clad steel lightning protection wire braiding section.
8. The lightning protection overhead insulated cable based on the composite shielding structure of claim 1, wherein the aluminum-clad steel lightning protection wire braided sections are fixedly connected with the self-healing layer, and the high-conductivity graphite composite strips and the aluminum-clad steel lightning protection wire braided sections are distributed at equal intervals along the circumferential direction of the cable in a staggered manner.
9. The lightning protection overhead insulated cable based on composite shielding structure of claim 1, wherein the high-conductivity graphite composite strip maintains a rigid support state below a tolerance threshold, and the high-conductivity graphite composite strip undergoes lamellar splitting, rigid collapse and radial collapse when exceeding the threshold.
10. The lightning protection overhead insulated cable based on the composite shielding structure of claim 1, wherein the basalt fiber protection net is used for restraining pulverized high-conductivity graphite composite strips, and the basalt fiber protection net prevents dust from falling aloft.

Description

Lightning protection overhead insulated cable based on composite shielding structure Technical Field The invention relates to the technical field of cables, in particular to a lightning protection overhead insulated cable based on a composite shielding structure. Background The cable main body adopts a crosslinked polyethylene insulated power cable which is a cable for power transmission, wherein the crosslinked polyethylene is used as an insulating layer, and the metal is used as a conductor. In Chinese patent publication No. CN204884602U, the utility model discloses a cable of cross-linked polyethylene insulating material for an overhead insulated cable containing graphene, which aims to solve the technical problem of reducing the cost of the overhead insulated cable, and adopts the following technical scheme: compared with the prior art, the cable with the crosslinked polyethylene insulating material and the auxiliary heat conducting agent has the advantages that the heat conductivity, the ultraviolet resistance and the weather resistance of the insulating layer of the aerial insulating cable are improved, the performance of the insulating layer is more excellent, the thickness of the insulating layer of the aerial insulating cable can be reduced by 5-10% compared with the insulating layer of the prior art, the cost of the aerial insulating cable is greatly reduced, and the difficulty of cable construction is reduced. Aiming at the above and the prior related technologies, the prior lightning protection overhead insulated cable has the defects that lightning current discharge and electric field voltage equalizing can be realized within the rated tolerance range, an insulating layer is effectively protected from breakdown damage, but when the lightning protection cable suffers strong lightning strike impact exceeding the bearing threshold, the conditions of insulation breakdown and line tripping power failure can occur, and the long-term operation reliability and the power supply safety of the overhead line are seriously reduced. Disclosure of Invention The invention aims to solve the technical problems that in the prior art, when an overhead insulated cable is subjected to strong lightning strike impact exceeding a bearing threshold value, the defect of insulation breakdown and line tripping power failure occurs, and therefore, the lightning strike prevention overhead insulated cable based on a composite shielding structure is provided. The lightning protection overhead insulated cable based on the composite shielding structure comprises a cable conductor, wherein an insulating layer surrounds the outer wall of the cable conductor, a self-healing layer surrounds the outer wall of the insulating layer, a repairing liquid sac chamber is fixedly connected to the inner side of the self-healing layer, a separation layer is fixedly connected to the side of the repairing liquid sac chamber, a curing agent sac chamber is fixedly connected to the other side of the separation layer, a connecting cable is fixedly connected to the inner side of the separation layer, a connecting bottom plate is fixedly connected to the bottom of the connecting cable, a prefabricated tearing opening is fixedly connected to the outer wall of the connecting cable, an elastic energy storage sheet is fixedly connected to the top of the connecting cable, a high-conductivity graphite composite strip is tightly attached to the top of the elastic energy storage sheet, an aluminum-clad steel lightning protection wire weaving section is tightly attached to the side of the elastic energy storage sheet, a basalt fiber protection net is fixedly connected to the outer wall of the aluminum-clad steel lightning protection wire weaving section, and a rubber sheath is encircled to the outer wall of the basalt fiber protection net. Preferably, the curing agent sac chamber is fixedly connected with the self-healing layer, and the curing agent sac chamber and the repairing liquid sac chamber are symmetrically arranged relative to the vertical central axis of the separation layer. Preferably, the repairing liquid sac chamber, the separation layer and the curing agent sac chamber are combined to form a self-healing capsule, and the self-healing capsule is arranged at equal intervals relative to the inside of the self-healing layer. Preferably, the conductive polyurethane prepolymer repairing liquid containing ten percent of graphite micropowder is encapsulated in the repairing liquid sac chamber, and the polyurethane latent curing agent is encapsulated in the curing agent sac chamber. Preferably, the repairing liquid sac chamber and the curing agent sac chamber are of a double-cavity connected capsule structure, and the prefabricated tearing opening is a weak tearing line shared by the two cavities. Preferably, the elastic energy storage sheet adopts a semi-conductive elastic stainless steel sheet, and the elastic energy storage sheet is in an arc-shaped a