CN202042267U - Flame-retardant polyolefin inner sheath, cross-linked polyolefin outer sheath shipboard power cable - Google Patents

Abstract

The utility model discloses a marine power cable with a flame-retardant polyolefin inner sheath and a cross-linked polyolefin outer sheath. The marine power cable comprises two conductor cable cores, each conductor cable core comprises a copper conductor, a flame-retardant layer, a shielding layer and a cross-linked polyethylene insulating bush, and a wrapping tape, a polyolefin inner sheath, a copper wire braiding armored layer and a cross-linked polyolefin outer sheath are arranged outside the conductor cable core. The marine power cable has a simple structure and is easy to realize, the polyolefin inner sheath and the cross-linked polyolefin outer sheath outside the conductor cable core can effectively improve the flame retarding capacity of the power cable as well as safety of the power cable, a flame-retardant mica layer outside the copper conductor can effectively improve the flame retarding property of the conductor cable core, and the shielding layer can effectively shield electromagnetic wave.

Description

Flame-retardant polyolefin inner sheath, cross-linked polyolefin outer sheath shipboard power cable

technical field

The utility model relates to the field of power cables, in particular to a marine power cable with a flame-retardant polyolefin inner sheath and a cross-linked polyolefin outer sheath.

Background technique

Power cables are electrical devices used to transmit and distribute electrical energy. In power lines, the proportion of cables is gradually increasing. The main function of the power cable is to transmit and distribute high-power electric energy in the main line of the power system. Modern ships have a high degree of electrification and need to use a large number of power cables for power transmission, and modern ships have requirements for the flame retardant properties of power cables. Traditional power cables cannot meet the needs of modern ships.

Utility model content

The purpose of the utility model is to provide a marine power cable with a flame-retardant polyolefin inner sheath and a cross-linked polyolefin outer sheath to solve the problem that the flame-retardant properties of the power cable in the prior art cannot meet the needs of modern ships.

In order to achieve the above object, the technical solution adopted in the utility model is:

The marine power cable with a flame-retardant polyolefin inner sheath and a cross-linked polyolefin outer sheath is characterized in that it includes two compound bundled conductor cores. Composed of refractory layer, shielding layer, and cross-linked polyethylene insulating sleeve, the twisted pitch ratio of the two conductor cores is less than 10 times, the resistivity of the copper conductor is less than 0.017241Ω.mm ² /m, and the outside of the two conductor cores is sequentially Covered with wrapping tape, polyolefin inner sheath, steel wire braided armor layer, cross-linked polyolefin outer sheath. The marine power cable with a flame-retardant polyolefin inner sheath and a cross-linked polyolefin outer sheath is characterized in that the surface of the copper conductor is plated with a tin layer.

The marine power cable with flame-retardant polyolefin inner sheath and cross-linked polyolefin outer sheath is characterized in that: the steel wire braided armor layer is braided by steel wires coated with a zinc-tin layer on the surface.

The utility model has simple structure and is easy to realize. The conductor core plays the role of transmitting electric energy. The two conductor cores are twisted together through compound bundle twisting, and the twisting pitch ratio is less than 10 times, which can ensure the compact structure of the power cable and reduce the transmission loss of electric energy. Copper conductors Resistivity less than 0.017241Ω.mm ² /m can improve the transmission efficiency of electric energy, the fire-resistant mica layer outside the copper conductor can effectively improve the fire-resistant performance of the conductor core, the shielding layer outside the copper conductor can effectively shield electromagnetic waves, braided into steel wire The steel wire of the braided armor layer is galvanized and tin-coated to prevent oxidation during processing and use. The polyolefin inner sheath and cross-linked polyolefin outer sheath outside the conductor core can effectively improve the resistance of the power cable. Combustibility, but also improve the safety of power cables.

Description of drawings

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

Detailed ways

As shown in Figure 1. A shipboard power cable with a flame-retardant polyolefin inner sheath and a cross-linked polyolefin outer sheath, including two conductor cores 1 that are stranded in multiple forms. Layer 3, shielding layer 4, cross-linked polyethylene insulating sleeve 5, the surface of copper conductor 2 is plated with tin layer, the pitch ratio of the two conductor cores 1 is less than 10 times, and the resistivity of copper conductor 2 is less than 0.017241Ω. mm ² /m, two conductor cores 1 are covered with wrapping tape 6 , polyolefin inner sheath 7 , steel wire braided armor layer 8 , and cross-linked polyolefin outer sheath 9 in sequence. The steel wire braided armor layer 8 is formed by braiding steel wires coated with galvanized tin layer on the surface.

In the utility model, an oxygen-free copper rod is used for the copper conductor, and the resistivity of the copper is less than 0.017241Ω.mm ² /m (20°C). The annealed copper wire after drawing is tin-plated to prevent oxidation during processing and use. The conductor core adopts compound bundle twisting, and the twisting pitch ratio is less than 10 times. The insulation is a hybrid material of cross-linked polyethylene insulation. Semi-finished products are subjected to water immersion voltage or dry spark test. The inner sheath is made of polyolefin sheath material. Braided with galvanized tin steel wire. The outer sheath is made of cross-linked polyolefin sheath material. The factory inspection items include conductor DC resistance, insulation resistance, AC withstand voltage test, cable structure size inspection, cable appearance mark inspection, etc.

Claims (3)

1. A marine power cable with a flame-retardant polyolefin inner sheath and a cross-linked polyolefin outer sheath, which is characterized in that it includes two conductor cores with multiple twisted strands, and the conductor cores are made of copper conductors, which are successively covered with copper conductors. The refractory layer outside the conductor, the shielding layer, and the cross-linked polyethylene insulating sleeve are composed. The twisting pitch ratio of the two conductor cores is less than 10 times, and the resistivity of the copper conductor is less than 0.017241Ω.mm ² /m. The two conductor cores The outside is sequentially covered with a wrapping tape, a polyolefin inner sheath, a steel wire braided armor layer, and a cross-linked polyolefin outer sheath. 2. The marine power cable with a flame-retardant polyolefin inner sheath and a cross-linked polyolefin outer sheath according to claim 1, wherein the surface of the copper conductor is plated with a tin layer. 3. The marine power cable with flame-retardant polyolefin inner sheath and cross-linked polyolefin outer sheath according to claim 1, characterized in that: the steel wire braided armor layer is braided by steel wire coated with a zinc-tin layer on the surface become.

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