CN202711843U - Flame-retardant power cable with concentric conductor - Google Patents

Abstract

The utility model provides a concentric conductor flame-retardant power cable, which includes an insulating core, the insulating core includes a conductor and an insulating layer, the conductor is a copper core or an aluminum core, and the insulating layer is a cross-linked polyethylene insulating layer , the insulated wire core is wrapped with a tape layer, the tape layer is a non-woven tape tape layer, the tape layer is wrapped with a concentric conductor, and the concentric conductor is a copper wire or a copper strip , the concentric conductor is wrapped with an inner sheath layer, an armor layer and an outer sheath layer in turn; this kind of concentric conductor flame-retardant power cable is easy to process, can effectively reduce costs, has good flexibility, and is easy to construct. While transmitting power, it can effectively avoid interference to surrounding electrical equipment, and at the same time eliminate the influence of external electromagnetic interference on the cables connected to it, avoid overvoltage caused by strong lightning and cause cable breakdown or damage, and improve cable safety. sex and reliability.

Description

Flame-retardant power cable with concentric conductors

technical field

The utility model relates to a power cable, in particular to a flame-retardant power cable with concentric conductors.

Background technique

Compared with the usual plastic insulated and sheathed power cables, concentric conductor power cables have many advantages. Its use is conducive to improving the safety and reliability of the power supply system, improving the quality of power transmission, and is more suitable for the requirements of modern power transmission and transformation systems. It has broad development prospects and application markets.

However, in domestic cable products, there is no or very little structure of concentric conductors. Some foreign developed countries are mostly committed to research in this area and put it into practice. The design principles of concentric conductor power cables: 1. In order to facilitate production and management , as far as possible to unify the wire diameter of the concentric wires; 2. According to the production equipment, the minimum wire diameter is stipulated under the condition that the concentric wires are evenly distributed on the wrapping layer of the cable core, and the distance between them is not greater than 4mm. The less the better; 3. In order to ensure the uniformity of the concentric conductors and not to slide relative to each other, and to ensure that the appearance of the cable is round after the sheath is extruded, the layered non-woven fabric or PVC tape wrapping method is used, that is, the insulated core After cabling, the tape is twisted concentrically with the wire or the copper tape is wrapped and the non-woven tape is overlapped and wrapped.

Utility model content

The purpose of this utility model is to provide a concentric conductor flame-retardant power cable to solve the problem of improving the safety and reliability of the power supply system, improving the quality of power transmission, and making the cable more suitable for the requirements of modern power transmission and transformation systems.

The technical solution of the utility model is:

A concentric conductor flame-retardant power cable, comprising an insulated wire core, the insulated wire core includes a conductor and an insulating layer, the conductor is a copper core or an aluminum core, the insulating layer is a cross-linked polyethylene insulating layer, and the insulating The wire core is wrapped with a wrapping layer, and the wrapping layer is a non-woven tape wrapping layer. The wrapping layer is wrapped with a concentric conductor, and the concentric conductor is a copper wire or a copper strip. The concentric The conductor is wrapped with an inner sheath layer, an armor layer and an outer sheath layer in sequence, the inner sheath layer is a polyvinyl chloride inner sheath layer, and the outer sheath layer is a cross-linked polyethylene outer sheath layer.

A further improvement lies in: glass fiber filaments are filled between the insulating layer and the tape layer.

A further improvement is that: the armor layer is a thin steel wire armor layer.

A further improvement is that: the number of the insulated wire cores is three.

The utility model is a concentric conductor flame-retardant power cable. The concentric conductor is wrapped outside the insulated wire core and can be used as a neutral wire and a ground wire, or can be shared by the neutral wire and the ground wire. The material is copper wire, copper strip or copper wire. Wire plus copper tape, the size of its cross section is the same or half of that of the phase line of the cable. And in the case of ensuring that the concentric conductors are evenly distributed on the wrapping layer of the cabled insulated core, and the spacing is not greater than 4mm, the minimum wire diameter is specified so that the number of wires is small.

The flame-retardant power cable with concentric conductors is easy to process, can effectively reduce costs, has good flexibility, and is easy to construct. This kind of flame-retardant power cable with concentric conductors can effectively avoid interference to surrounding electrical equipment when transmitting power, and at the same time eliminate the influence of external electromagnetic interference on the cable connected to it, and can avoid overvoltage caused by strong lightning and cable strikes. Wear or damage, improve the safety and reliability of the cable, improve the sensitivity of the overcurrent protection device at the head end of the line, effectively protect the cable and other equipment, and eliminate the ground fault caused by one-phase insulation breakdown as soon as possible.

The beneficial effects of the utility model are: the utility model is a flame-retardant power cable with concentric conductors, which is easy to process, can effectively reduce costs, has good flexibility, and is easy to construct. When transmitting power, it can effectively avoid interference to surrounding electrical equipment, and at the same time eliminate the impact of external electromagnetic interference on the cables connected to it, avoid overvoltage caused by strong lightning and cause cable breakdown or damage, and improve cable safety. It can improve the sensitivity of the overcurrent protection device at the head end of the line, effectively protect cables and other equipment, and eliminate the ground fault caused by one-phase insulation breakdown as soon as possible.

Description of drawings

Figure 1 is a schematic structural view of an embodiment of the utility model;

Among them: 1-conductor, 2-insulation layer, 3-tape layer, 4-concentric conductor, 5-inner sheath layer, 6-armouring layer, 7-outer sheath layer.

Detailed ways

Preferred embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, this embodiment provides a concentric conductor flame-retardant power cable, including an insulated core, the insulated core includes a conductor 1 and an insulating layer 2, the conductor 1 is a copper core, and the insulating layer 2 It is a cross-linked polyethylene insulating layer, and the insulating wire core is wrapped with a tape layer 3, and the tape layer 3 is a non-woven tape tape layer, and the tape layer 3 is wrapped with a concentric conductor 4 , the concentric conductor 4 is a copper wire, and the concentric conductor 4 is wrapped with an inner sheath layer 5, an armor layer 6 and an outer sheath layer 7 in sequence, and the inner sheath layer 5 is a polyvinyl chloride inner sheath layer, the outer sheath layer 7 is a cross-linked polyethylene outer sheath layer, the armor layer 6 is a thin steel wire armor layer, and the number of the insulated wire cores is three.

This embodiment is a concentric conductor flame-retardant power cable. The concentric conductor 4 is wrapped outside the insulated wire core. It can be used as a neutral wire and a ground wire, or it can be shared by the neutral wire and the ground wire. The material is copper wire, copper tape or Copper wire plus copper strip, the size of its section is the same as or half of the section of the phase line of the cable. And in the case of ensuring that the concentric conductors 4 are evenly distributed on the wrapping layer of the cabled insulated wire core, and the spacing thereof is not greater than 4 mm, the minimum wire diameter is specified so that the number of wires is small.

The flame-retardant power cable with concentric conductors is easy to process, can effectively reduce costs, has good flexibility, and is easy to construct. This kind of flame-retardant power cable with concentric conductors can effectively avoid interference to surrounding electrical equipment when transmitting power, and at the same time eliminate the influence of external electromagnetic interference on the cable connected to it, and can avoid overvoltage caused by strong lightning and cable strikes. Wear or damage, improve the safety and reliability of the cable, improve the sensitivity of the overcurrent protection device at the head end of the line, effectively protect the cable and other equipment, and eliminate the ground fault caused by one-phase insulation breakdown as soon as possible.

The beneficial effects of this embodiment are: this embodiment is a concentric conductor flame-retardant power cable, which is easy to process, can effectively reduce costs, has good flexibility, and is easy to construct. When transmitting power, it can effectively avoid interference to surrounding electrical equipment, and at the same time eliminate the impact of external electromagnetic interference on the cables connected to it, avoid overvoltage caused by strong lightning and cause cable breakdown or damage, and improve cable safety. It can improve the sensitivity of the overcurrent protection device at the head end of the line, effectively protect cables and other equipment, and eliminate the ground fault caused by one-phase insulation breakdown as soon as possible.

Claims (4)

1. antiflaming power cable of concentric conductors, it is characterized in that: comprise insulated wire cores, described insulated wire cores comprises conductor (1) and insulating barrier (2), described conductor (1) is copper core or aluminium core, described insulating barrier (2) is crosslinked polyetylene insulated layer, described insulated wire cores is surrounded with belting layer (3) outward, described belting layer (3) is the nonwoven fabric belts belting layer, the outer concentric conductor (4) that is surrounded with of described belting layer (3), described concentric conductor (4) is copper wire or copper strips, the outer inner restrictive coating (5) that is enclosed with successively of described concentric conductor (4), armour (6) and external sheath layer (7), described inner restrictive coating (5) is the polyvinyl chloride inner sheath layer, and described external sheath layer (7) is the crosslinked polyethylene external sheath layer.

2. a kind of antiflaming power cable of concentric conductors as claimed in claim 1 is characterized in that: be filled with glass fiber between described insulating barrier (2) and belting layer (3).

3. a kind of antiflaming power cable of concentric conductors as claimed in claim 1 or 2, it is characterized in that: described armour (6) is the LWA light wire armoured layer.

4. a kind of antiflaming power cable of concentric conductors as claimed in claim 1 or 2, it is characterized in that: the quantity of described insulated wire cores is three.

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