CN201153060Y - Crosslinked polyethylene insulated crimped metal sleeve power cable having rated voltage 220kV - Google Patents

Abstract

The utility model provides a power cable with a rated voltage of 220kV XLPE insulated corrugated metal sheath. The cross-sectional structure of the cable includes a non-metal sheath, a corrugated metal sheath, a semi-conductive resistance water buffer zone, and an insulating shield from the outside to the inside. layer, insulating layer, conductor shielding layer, semi-conductive nylon tape, conductor. The effect of the utility model is that the high-voltage cable with this structure can not only increase the mechanical strength of the metal sheath, improve the corrosion resistance of the metal sheath, but also increase the capacity of the short-circuit current carried by the metal sheath, ensuring that the cable is short-circuited in the event of a short circuit. security issues. The cable with this structure is suitable for large-capacity transmission lines such as large power stations.

Description

Rated voltage 220kV XLPE insulated corrugated metal sheath power cable

technical field

The utility model relates to a cable, in particular to a power cable with a rated voltage of 220kV cross-linked polyethylene insulated corrugated metal sheath.

Background technique

With the sustained and rapid development of the national economy and the continuous improvement of people's living standards, the demand for electricity is increasing. Insufficient supply of electric energy has become one of the important factors restricting the sustainable and high-speed development of my country's national economy. Therefore, it is imperative to develop high-voltage transmission and increase the voltage level of transmission lines. Oil-filled power cables are used in traditional high-voltage transmission lines. Due to the limitation of laying drop and the high cost of line maintenance, this kind of cable has been phased out and gradually replaced by XLPE insulated power cables. . However, the corrugated aluminum-sheathed high-voltage power cables popularized at present, because the material of the metal sheath is aluminum, the capacity of the short-circuit current of the cable with this structure is also limited to a certain extent.

Contents of the invention

The purpose of this utility model fundamentally improves the structure of the above two high-voltage cables with a rated voltage of 220kV. The high-voltage cable with this structure can not only increase the mechanical strength of the metal sheath, improve the corrosion resistance of the metal sheath, but also It can increase the capacity of the short-circuit current carried by the metal sheath, ensuring the safety of the cable when a short-circuit occurs.

In order to achieve the above purpose, the technical solution adopted by the utility model is to provide a power cable with a rated voltage of 220kV cross-linked polyethylene insulated corrugated metal sheath, wherein: the cross-sectional structure of the cable includes non-metallic sheath, corrugated metal Sheath, semiconductive resistive water buffer tape, insulating shield, insulating layer, conductor shield, semiconductive nylon tape, conductor.

The cross-sectional shape of the conductor is a compacted circle, a five-segmented conductor or a seven-segmented conductor.

The corrugated metal sleeve is a corrugated copper sleeve or stainless steel sleeve radially wrapped relative to the semiconducting resistance water buffer zone.

The non-metal sheath is made of insulating grade polyvinyl chloride, medium density polyethylene or high density polyethylene.

The effect of the utility model is that the high-voltage cable with this structure can not only increase the mechanical strength of the metal sheath, improve the corrosion resistance of the metal sheath, but also increase the capacity of the short-circuit current carried by the metal sheath, ensuring that the cable is short-circuited in the event of a short circuit. security issues. The high-voltage cable with this structure is suitable for large-capacity transmission lines such as large-scale power stations.

Description of drawings

Fig. 1 is a cross-sectional structure schematic diagram of a rated voltage 220kV cross-linked polyethylene insulated corrugated metal sheath power cable of the present utility model;

In the picture:

1. Conductor 2. Semi-conductive nylon tape 3. Conductor shielding

4. Insulation layer 5. Insulation shield 6. Semiconducting resistance water buffer zone

7. Wrinkle metal sheath 8. Non-metallic sheath

Detailed ways

The structure of the rated voltage 220kV cross-linked polyethylene insulated corrugated metal sheathed power cable of the utility model is described in conjunction with the accompanying drawings and embodiments.

The utility model has a rated voltage of 220kV XLPE insulated corrugated metal sheathed power cable. The cross-sectional structure of the cable includes a non-metallic sheath 8 and a conductive coating on its surface, a corrugated metal sheath 7 and asphalt anticorrosion on its surface from the outside to the inside. Coating, semiconductive resistance water buffer tape 6, insulating shielding layer 5, insulating layer 4, conductor shielding layer 3, semiconductive nylon tape 2, conductor 1. The cross-sectional shape of the conductor 1 is a compacted circular, five-section conductor or seven-section conductor, and the corrugated metal sheath 7 is a corrugated copper or stainless steel sheath wrapped radially relative to the semiconducting resistance water buffer zone 6 . The non-metallic sheath 8 is made of insulating grade polyvinyl chloride, medium density polyethylene or high density polyethylene.

The rated voltage 220kV cross-linked polyethylene insulated corrugated metal sheath power cable structure of the utility model is realized in this way:

Example 1

As shown in Figure 1, the rated voltage 220kV cross-linked polyethylene insulated corrugated copper sheathed polyethylene sheathed power cable, the model is YJTW03-127/220 1×1200mm ² , and its cross-sectional structure is as follows from the inside to the outside:

The cross-sectional shape is a compact circular five-segment conductor 1, a semi-conductive nylon tape 2, a conductor shielding layer 3, an insulating layer 4, an insulating shielding layer 5, a semi-conductive resistance water buffer tape 6, a corrugated copper sleeve 7, and a polyethylene sheath 8.

Example 2

As shown in Figure 1, the rated voltage 220kV XLPE insulated corrugated stainless steel sheathed PVC sheathed power cable is YJGW02-127/220 1×2500mm ² , and its cross-sectional structure is as follows from inside to outside:

The cross-sectional shape is a tightly pressed circular seven-segment conductor 1, semi-conductive nylon tape 2, conductor shielding layer 3, insulating layer 4, insulating shielding layer 5, semi-conductive resistance water buffer tape 6, corrugated stainless steel sleeve 7, polyvinyl chloride sheath Cover 8, and the metal shielding layer between the semiconducting resistance water buffer layer 6 and the corrugated stainless steel cover 7.

Claims (4)

1, the crosslinked polyetylene insulated wrinkle metallic sheath of a kind of rated voltage 220kV power cable is characterized in that: the cross section structure of this cable includes non metallic sheath (8), wrinkle metallic sheath (7), semiconductive block water buffer strip (6), insulation screen (5), insulating barrier (4), conductor shield (3), semiconductive nylon tape (2), conductor (1) from outside to inside successively.

2, according to the crosslinked polyetylene insulated wrinkle metallic sheath of the described rated voltage 220kV of claim 1 power cable, it is characterized in that: the cross sectional shape of described conductor (1) is for pressing circle, five milliken conductors or seven milliken conductors.

3, according to the crosslinked polyetylene insulated wrinkle metallic sheath of the described rated voltage 220kV of claim 1 power cable, it is characterized in that: wrinkle copper sheathing or stainless steel sleeve that described wrinkle metallic sheath (7) radially wraps up for the buffer strip (6) that blocks water with respect to semiconductive.

4, according to the crosslinked polyetylene insulated wrinkle metallic sheath of the described rated voltage 220kV of claim 1 power cable, it is characterized in that: described non metallic sheath (8) is made for polyvinyl chloride, medium density polyethylene or the high density polyethylene (HDPE) of insulation level.

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