CN212847799U

CN212847799U - Low-temperature-resistant medium-voltage power cable

Info

Publication number: CN212847799U
Application number: CN202021548571.6U
Authority: CN
Inventors: 芮黎春
Original assignee: Wuxi City Pu Cao Technology Co ltd
Current assignee: Wuxi City Pu Cao Technology Co ltd
Priority date: 2020-07-30
Filing date: 2020-07-30
Publication date: 2021-03-30
Anticipated expiration: 2030-07-30

Abstract

The utility model discloses a low temperature resistant medium voltage power cable, which comprises a heat-resistant silicon rubber support body arranged at the center of the cable, wherein a plurality of cable cores are uniformly distributed on the outer periphery of the heat-resistant silicon rubber support body; a temperature control detection line is arranged in the center of the heat-resistant silicon rubber support body, and a plurality of heating belts are uniformly arranged on the periphery of the temperature control detection line; a PP mesh belt filling layer is arranged between the cable core and the heat-resistant silicon rubber support body; a waterproof isolation belt is wrapped outside the PP mesh belt filling layer; the median outside of blocking water still sets gradually no asbestos fire-resistant fire-retardant median, inner sheath, steel band armor, organically winds the area around package buffer layer and oversheath, and this cable is cold-resistant, be difficult to the fracture.

Description

Low-temperature-resistant medium-voltage power cable

Technical Field

The utility model relates to a middling pressure power cable field especially relates to low temperature resistant middling pressure power cable.

Background

The low-temperature-resistant medium-voltage power cable is widely applied to severe and cold environments, such as connection between electrical equipment in severe environments of power generation, metallurgy, chemical industry, petroleum, ports and the like. The elastic and bending performance of the material can be kept well in high and cold climate. In northern areas, plateau areas, refrigeration houses and the like of China, a large amount of low-temperature-resistant medium-voltage cables are needed, and the market prospect is wide. In northern areas of China, the temperature in winter is very low and is often lower than minus 40 ℃, and even if a common YJV22-8.7/15kV medium-voltage power cable is heated during laying or in a greenhouse before laying, the phenomena of sheath cracking and the like are still unavoidable in the laying process, so that the cable is damaged and cannot be normally used. The thickness of a steel strip armor layer of a common medium-voltage power cable is mostly 0.5mm or 0.8mm, the wrapping process is double-layer gap wrapping, the gap rate is not more than 50%, so that a small step can be formed at the overlapped part of two layers of steel strips, the outer sheath bears the largest mechanical stress and the largest internal stress at the overlapped part of the two layers of steel strips, and displacement is easily generated between the two layers of steel strips during laying, and the outer sheath is particularly easy to crack, so that the outer sheath cracks; in addition, the common medium-voltage power cable sheath generally uses a polyvinyl chloride sheath, and the polyvinyl chloride sheath has insufficient cold resistance.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming prior art's shortcoming, providing a low temperature resistant middling pressure power cable that cold-resistant, be difficult to the fracture.

In order to realize the purpose of the utility model, the technical proposal of the utility model is that:

the low-temperature-resistant medium-voltage power cable comprises a heat-resistant silicon rubber support body arranged in the center of the cable, wherein a plurality of cable cores are uniformly distributed on the outer periphery of the heat-resistant silicon rubber support body; a temperature control detection line is arranged in the center of the heat-resistant silicon rubber support body, and a plurality of heating belts are uniformly arranged on the periphery of the temperature control detection line; a PP mesh belt filling layer is arranged between the cable core and the heat-resistant silicon rubber support body; a waterproof isolation belt is wrapped outside the PP mesh belt filling layer; the outer side of the water-blocking isolation belt is also sequentially provided with an asbestos-free fire-resistant flame-retardant isolation belt, an inner sheath, a steel belt armor layer, an organic wrapping belt wrapping buffer layer and an outer sheath.

Preferably, the organic lapping buffer layer is a reinforced non-woven fabric belt.

Preferably, the inner sheath and the outer sheath are both cross-linked polyethylene sheaths.

Preferably, the cable core comprises a conductor, and an inner shielding layer, an insulating layer and an insulating shielding layer which are extruded on the outer layer of the conductor.

The utility model has the advantages that:

firstly, the method comprises the following steps: a layer of organic wrapping tape is added outside the steel tape armor layer to play a role in buffering; the medium-voltage power cable is heavy after being armored, the wrapping buffer belt is easy to damage when being received on a cable reel on one layer of the cable, when the outer sheath is extruded, a die opening is blocked or the surface of the cable is difficult to see due to the fact that the wrapping buffer belt is damaged, the wrapping buffer belt can be normally wrapped, the strength is certain, the wrapping buffer belt is adaptive to the temperature grade of the cable, and reinforced non-woven fabrics are selected as buffer layers after multiple times of test comparison;

secondly, the method comprises the following steps: the inner sheath and the outer sheath are made of polyethylene materials with excellent low-temperature resistance, the low-temperature resistance can reach 70 ℃ below zero, and the normal use of the cable can be completely ensured;

thirdly, the method comprises the following steps: the heat-resistant silicon rubber support body is arranged in the center of the cable, so that the cable core is supported and fixed, and the filling and wrapping are convenient;

fourthly: a temperature control detection wire and a heating belt are arranged in the heat-resistant silicon rubber support body, an end lead of the heating belt can be connected with a power supply for heating, the temperature control detection wire is arranged, the heating temperature is controlled by connecting a temperature control monitor, and the real-time monitoring is carried out; under extreme conditions, the cable core is heated from the inside of the cable, and the cable core can be ensured to work normally.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure: 10 is heat-resisting silicon rubber support, 11 is the control by temperature change probe wire, 12 is the heating band, 20 is the cable core, 21 is the conductor, 22 is the internal shield layer, 23 is the insulating layer, 24 is the insulating shield layer, 30 is the PP guipure filling layer, 40 is the median that blocks water, 50 is the fire-resistant fire-retardant median of no asbestos, 60 is the inner sheath, 70 is the steel band armor, 80 is the organic taped package buffer layer, 90 is the oversheath.

Detailed Description

The technical solution in the embodiment of the present invention is clearly and completely described below with reference to the accompanying drawings.

The low-temperature-resistant medium-voltage power cable comprises a heat-resistant silicon rubber support body 10 arranged in the center of the cable, wherein a plurality of cable cores 20 are uniformly distributed on the periphery of the heat-resistant silicon rubber support body 10; a temperature control detection wire 11 is arranged at the center of the heat-resistant silicon rubber support body 10, and a plurality of heating belts 12 are uniformly arranged on the periphery of the temperature control detection wire 11; a PP mesh belt filling layer 30 is arranged between the cable core 20 and the heat-resistant silicon rubber support body 10; a water-blocking isolating belt 40 is wrapped outside the PP mesh belt filling layer 30; the outer side of the water-blocking isolation belt 40 is also sequentially provided with an asbestos-free fire-resistant flame-retardant isolation belt 50, an inner sheath 60, a steel belt armor layer 70, an organic wrapping belt wrapping buffer layer 80 and an outer sheath 90.

Preferably, the organic wrapping tape wrapping buffer layer 80 is a reinforced non-woven fabric tape.

Preferably, the inner sheath 60 and the outer sheath 90 are both cross-linked polyethylene sheaths.

Preferably, the cable core 20 includes a conductor 21, and an inner shield layer 22, an insulating layer 23, and an insulating shield layer 24 which are extruded on an outer layer of the conductor 21.

The described embodiments are only some, but not all embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Claims

1. Low temperature resistant medium voltage power cable, its characterized in that: the cable comprises a heat-resistant silicon rubber support body (10) arranged at the center of the cable, wherein a plurality of cable cores (20) are uniformly distributed on the periphery of the heat-resistant silicon rubber support body (10); a temperature control detection line (11) is arranged at the center of the heat-resistant silicon rubber support body (10), and a plurality of heating belts (12) are uniformly arranged on the periphery of the temperature control detection line (11); a PP mesh belt filling layer (30) is arranged between the cable core (20) and the heat-resistant silicon rubber support body (10); a waterproof isolation belt (40) is wrapped outside the PP mesh belt filling layer (30); the outer side of the water-blocking isolation belt (40) is further sequentially provided with an asbestos-free fire-resistant flame-retardant isolation belt (50), an inner sheath (60), a steel-tape armor layer (70), an organic wrapping belt wrapping buffer layer (80) and an outer sheath (90).

2. The low temperature resistant medium voltage power cable according to claim 1, characterized in that: the organic lapping tape lapping buffer layer (80) is a reinforced non-woven cloth tape.

3. The low temperature resistant medium voltage power cable according to claim 1, characterized in that: the inner sheath (60) and the outer sheath (90) are both cross-linked polyethylene sheaths.

4. The low temperature resistant medium voltage power cable according to claim 1, characterized in that: the cable core (20) comprises a conductor (21), and an inner shielding layer (22), an insulating layer (23) and an insulating shielding layer (24) which are extruded on the outer layer of the conductor (21).