CN201174271Y - EHV XLPE Cable - Google Patents

Abstract

The utility model discloses an ultra-high voltage cross-linked cable. The conductor of the cable is wrapped with a semi-conductive nylon tape. The insulation adopts a three-layer extrusion structure. The inner insulation is a conductor shielding layer, the middle is cross-linked polyethylene, and the outer insulation is an insulation layer. The shielding layer, the waterproof layer outside the insulation is composed of a radial waterproof layer and a longitudinal waterproof layer. The longitudinal waterproof layer is composed of a layer of semi-conductive resistance water tape and a layer of water-blocking buffer tape. The radial waterproof layer is welded corrugated aluminum The outer sheath is coated with asphalt anti-corrosion layer, the inner sheath is extruded with a thin layer of polyethylene, the middle is extruded with flame-retardant polyvinyl chloride, and the outer sheath is extruded with a layer of semi-conductive material. The cable has high working temperature, excellent electrical performance, large transmission capacity, light structure, convenient installation and laying, no drop limit, easy maintenance, especially no risk of fire caused by oil leakage, and is mainly used for high-drop ultra-high voltage leads of large-capacity power stations. It can also be used as a transmission wire across rivers and rivers. It has a wide range of uses and has good social and economic benefits.

Description

EHV XLPE Cable

technical field

The utility model relates to a power cable structure, in particular to an ultra-high voltage cross-linked cable. It belongs to the field of cable new technology.

Background technique

With the rapid development of my country's electric power industry, the demand for power cables, which are arteries and blood vessels for power transmission, is also increasing day by day. Among the power cables with various insulation forms, cross-linked polyethylene (XLPE) insulated power cables are an emerging and booming new army. In the development of power cables, although PVC power cables are simple to manufacture due to their process , stable performance, convenient laying, not limited by the height difference, etc., but due to its inherent shortcomings such as large dielectric loss (tgδ=8), low working temperature (65°C), and insufficient withstand voltage level, various defects are gradually revealed. This makes it an inevitable trend that XLPE insulated power cables will gradually replace PVC insulated power cables. In addition, cross-linked polyethylene insulated power cables have superior electrical properties and heat resistance, and are easy to connect and transport. At present, they have gradually replaced power cables with oil-impregnated paper insulation and PVC insulation structures. However, because the outer sheath of extra-high voltage cables often needs to be coated with asphalt and graphite, etc., which causes dust, is not conducive to construction, and is difficult to maintain. Therefore, XLPE insulated power cables need to improve the outer sheath of the cable to improve the cable. Comprehensive performance.

Utility model content

The technical problem to be solved by the utility model is to overcome the defects of the current ultra-high voltage cross-linked cable sheath, and provide a cable with superior electrical performance, good flame retardant effect, high working temperature, large transmission capacity, light structure, convenient installation and laying, and maintenance. Simple, especially for power cables that are not coated with pitch and graphite.

The purpose of this utility model is achieved in this way: an ultra-high voltage cross-linked cable includes a cable core, a waterproof layer and a sheath layer from the inside to the outside, and the cable core includes a conductor in the middle and a semi-conductive nylon tape on the surface of the conductor And the outer insulation layer, the waterproof layer and the sheath layer are wrapped around the cable core in turn. Vinyl layer and outer jacket of semi-conductive material.

The insulating layer adopts a three-layer extrusion structure, the inner insulation on the conductor surface is the conductor shielding layer, the middle is cross-linked polyethylene, and the outer insulation is the insulating shielding layer.

The above-mentioned waterproof layer has three layers, which are semi-conductive resistance water belt, semi-conductive water-blocking buffer belt and welded corrugated aluminum sleeve from inside to outside.

The utility model has the advantages of reasonable and simple structure, easy manufacture and low cost. The cable completely solves the dust problem in the production and construction process, which is convenient for cable monitoring and maintenance. In addition, it has strong electrical performance, flame retardant performance and waterproof performance; the cable structure is compact and round, which can fully meet the performance requirements of 500kV ultra-high voltage cross-linked cables. It is mainly used for high-drop ultra-high voltage lead-out wires of large-capacity power stations, and can also be used as transmission wires across rivers. It has a wide range of uses.

Description of drawings

Fig. 1 is the structural representation of the utility model.

In the figure: 1. Conductor 2. Semi-conductive nylon tape 3. Inner conductive shield 4. XLPE insulation 5. Outer conductive shield 6. Semi-conductive water-blocking tape 7. Semi-conductive buffer water-blocking tape 8. Welded corrugated aluminum sleeve 9. Asphalt Anti-corrosion layer 10. PE outer sheath 11. Flame-retardant PVC 12. Semi-conductive material

Detailed ways

As shown in Figure 1, the surface of the copper stranded conductor 1 is wrapped with a semi-conductive nylon tape 2, and the inner conductive shielding layer 3, XLPE insulation 4, and outer conductive shielding layer 5 are squeezed to form a cable core, and there are three waterproof layers on the outside. The first waterproof layer is composed of semi-conductive resistance water belt 6, semi-conductive water-resistant buffer belt 7 and welded corrugated aluminum sleeve 8 from the inside to the outside. An asphalt anti-corrosion layer 9 is applied between the waterproof layer and the sheath layer, and the PE inner protection layer is extruded. Cover 10, flame-retardant PVC sheath 11, and finally extrude a layer of semi-conductive material 12 to obtain the finished product.

Claims (3)

1. An ultra-high voltage cross-linked cable, which includes a cable core, a waterproof layer and a sheath layer from the inside to the outside. The cable core includes a conductor in the middle, a semi-conductive nylon tape on the surface of the conductor and an outer insulating layer, and the waterproof layer The sheath layer and the sheath layer are wrapped around the cable core in turn. It is characterized in that: the sheath layer of the cable is a three-layer structure, which is respectively a polyethylene layer, a flame-retardant polyvinyl chloride layer and a semi-conductive material outer sheath from the inside to the outside. set. 2. The ultra-high voltage cross-linked cable according to claim 1, characterized in that: the waterproof layer has three layers, from inside to outside are semi-conductive resistance water belt, semi-conductive water-blocking buffer belt and welded corrugated aluminum sleeve. 3. The ultra-high voltage cross-linked cable according to claim 1 or 2, characterized in that: the insulating layer adopts a three-layer extruded structure, the inner insulation on the conductor surface is a conductor shielding layer, the middle is cross-linked polyethylene, and the outer Insulation is an insulating shield.