CN112037971A - Flexible oil-resistant waterproof medium-voltage cable - Google Patents

Abstract

The invention discloses a flexible oil-resistant and waterproof medium-voltage cable, which comprises a soft copper conductor in the center, a semiconductive cable tie layer, an inner semiconductive shielding layer, an insulating layer and an outer semiconductive layer which are sequentially covered by the soft copper conductor to the outer layer. Shield, metal overall shield, polyester tie and outer jacket. The semi-conductive cable tie layer is wrapped around the soft copper conductor by gap wrapping technology; the inner semi-conductive shielding layer, insulating layer and outer semi-conductive shielding layer are three-layer co-extrusion; Ester tie layer, the outermost layer is an extruded outer sheath layer. The flexible medium-voltage cable of the invention has good flexibility, oil resistance and waterproof performance, excellent mechanical resistance, convenient installation, movement and maintenance, strong resistance to large current overload, safe and reliable operation, and can meet the requirements of modern military vehicles, ships and high-speed railways. , mines, through tunnels, subway construction, nuclear power engineering, oil exploration and other related major mobile electrical equipment supporting application requirements, excellent electrical performance.

Description

A flexible oil-resistant and waterproof medium-voltage cable

technical field

The invention relates to the technical field of power cables, and more particularly to a flexible oil-resistant and waterproof medium-voltage cable.

Background technique

In recent years, various industries such as military vehicles, ships, high-speed rail construction, nuclear power technology, tunnel engineering, and oil production have developed rapidly in China. The development field of various heavy mobile equipment has continued to expand. It can no longer meet the supporting requirements of mobile heavy equipment systems, and the power supply type from low voltage to medium voltage can better support the transmission circuit of heavy mobile construction equipment; due to such high voltage cables, there is no supporting production in China. ; At present, only a few developed cable companies in the world can produce them, and domestic demand all depends on imports. Due to the limited safety, reliability and tracking services of flexible medium-voltage cable products imported, it restricts my country's production of this product. bottleneck. At present, domestic medium-voltage cable products of 3KV and below are all XLPE insulated cables, which can only be used as flexible medium-voltage cables for fixed laying and heavy-duty mobile equipment. Meet the electrical supporting construction needs of heavy mobile equipment. However, there is no research and development report in China for cables for mobile supporting projects with a medium voltage level below 10KV.

Therefore, how to realize the power supply of the flexible medium voltage cable supporting the heavy equipment is an urgent problem to be solved by those skilled in the art.

SUMMARY OF THE INVENTION

In view of this, the present invention provides a flexible oil-resistant and waterproof medium-voltage cable, which includes a soft copper conductor in the center, and the outer layer of the soft copper conductor sequentially includes a semi-conductive cable tie layer wrapped by a gap wrapping technology, and a three-layer co-extrusion technology is adopted. Covered inner semi-conductive shield, insulation, outer semi-conductive shield, and metal overall shield, polyester tie and outer protective jacket. The semi-conductive cable tie layer is wrapped on the outside of the soft copper conductor by gap wrapping technology, which plays the role of shielding the soft copper conductor and balancing the electric field. The soft copper conductor covered with the semiconductive cable tie layer constitutes a flexible medium-voltage insulated wire; in order to ensure the better operation of the above-mentioned flexible medium-voltage insulated wire, a layer of fine soft copper wire metal shielding is designed on the outside to fully prevent the The inner flexible insulated wire is electromagnetically connected to the outside for better work and avoids the electromagnetic interference of the external electromagnetic to the flexible insulation. Outer protective jacket layer of extruded 105°C low-smoke halogen-free polyolefin material. The medium-voltage cable of the invention has good flexibility, oil resistance and waterproof performance, excellent mechanical resistance, convenient installation, movement and maintenance, strong resistance to large current overload, safe and reliable operation, and can meet the requirements of modern military ships, high-speed railways, mines, through Tunnel, subway construction, nuclear power engineering, oil exploration and other related high-level mobile electrical supporting application requirements, excellent electrical performance.

In order to achieve the above object, the present invention adopts the following technical solutions:

A flexible oil-resistant and waterproof medium-voltage cable, comprising: a soft copper conductor in the center; layer, metal overall shield, polyester cable ties and outer protective sleeve.

Preferably, the soft copper conductor is formed by twisting several thin copper wire bundles. The thin copper wire bundles are twisted into strands, and the strands are multi-core twisted into the required 5 types of soft conductor core specifications. The thin copper wires are annealed soft copper wires to form 5 types of flexible wire bundle stranded conductors. The cable products are relatively soft, and are suitable for the supporting application of medium-voltage cables of heavy-duty mobile electrical equipment in many industries.

Preferably, the semiconductive cable tie layer is wrapped on the outside of the soft copper conductor using a gap wrapping technique. The semi-conductive cable tie layer is thin-walled, which can ensure that the soft copper conductor has the effect of balancing the electric field distribution after being coated. Because the soft copper conductor is twisted by multiple wires, it is easy to form an air gap with the inner semi-conductive shielding layer. Therefore, a semi-conductive tie layer of semi-conductive material is added on the surface of the soft copper conductor to balance the above-mentioned The effect of the electric field of the soft copper conductor is equal potential with the soft copper conductor and in good contact with the three-layer co-extruded inner semi-conductive shielding layer to avoid partial discharge between the soft copper conductor and the inner semi-conductive shielding layer. This ensures the safety of insulated wires.

Preferably, the inner semiconducting shielding layer, the insulating layer and the outer semiconducting shielding layer are coated on the outer layer of the semiconducting cable tie layer by a three-layer co-extrusion technology, and the semiconducting cable tie layer and the soft copper conductor are A flexible insulated wire is formed, so that the electrical performance of the flexible insulating layer is better. The three-layer co-extrusion technology is a technological process for the production of medium-voltage cables.

Preferably, the inner semi-conductive shielding layer of the three-layer co-extrusion is of a peelable type, and the outer semi-conductive shielding layer is of a non-peelable type.

Preferably, the insulating layer adopts a high-density polyethylene insulating material with a withstand voltage of 10KV, which has excellent electrical insulating properties.

Preferably, the metal overall shielding layer adopts annealed soft copper wire bundles to be wound outside the three-layer co-extruded outer semi-conductive shielding layer to shield external electromagnetic interference and ensure better operation of the inner flexible insulated wire.

Preferably, the polyester tie is a polyester PP tape layer, which plays the role of isolating and tying the inner layer around the metal overall shielding layer.

Preferably, the outer protective sheath is made of halogen-free, low-smoke, flame-retardant, and 105°C-resistant polyolefin outer sheath material. , oil resistance, abrasion resistance and cutting resistance.

As can be seen from the above technical solutions, the present disclosure provides a flexible oil-resistant and waterproof medium-voltage cable, which includes a soft copper conductor with an annealed soft copper material in the center, and a semi-conductive cable tie layer, an inner and outer layer of the soft copper conductor that are covered with gaps in sequence. Semi-conductive shield, insulating layer, outer semi-conductive shield, metal overall shield, polyester tie and outer protective sleeve. The semi-conductive cable tie layer is wrapped and overlapped on the outside of the soft copper conductor, and the inner semi-conductive shielding layer, the 10KV insulating layer and the outer semi-conductive shielding layer adopt three-layer co-extrusion technology and the soft copper conductor covered with the semi-conductive cable tie layer. It constitutes a flexible insulated wire, and the outer protective sheath of the outermost layer of the cable has good physical and mechanical properties, oil resistance, water resistance, wear resistance, etc. The flexible medium-voltage cable of the invention has good flexibility, oil resistance and waterproof performance, excellent mechanical resistance, convenient installation, movement and maintenance, strong resistance to large current overload, safe and reliable operation, and can meet the requirements of modern military vehicles, ships and high-speed railways. , mines, through tunnels, subway construction, nuclear power engineering, oil exploration and other related major mobile electrical equipment supporting application requirements, excellent electrical performance.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the provided drawings without creative work.

1 accompanying drawing is a sectional view of a cable provided by the present invention;

Figure 2 is a cross-sectional view of a cable provided by the present invention.

In the drawings: 1-soft copper conductor, 2-semi-conductive cable tie layer, 3-inner semi-conductive shielding layer, 4-insulating layer, 5-outer semi-conductive shielding layer, 6-metal overall shielding layer, 7-polyester Cable ties, 8-outer protective sleeve.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The embodiment of the present invention discloses a flexible oil-resistant and waterproof medium-voltage cable, comprising: a soft copper conductor 1 in the center, a semi-conductive cable tie layer 2 and an inner semi-conductive shielding layer sequentially wrapped by the soft copper conductor 1 on the outer layer gap 3. Insulation layer 4 , outer semi-conductive shielding layer 5 , metal overall shielding layer 6 , polyester tie 7 and outer protective sleeve 8 .

In order to further optimize the above technical solution, the soft copper conductor 1 is formed by twisting several thin copper wire bundles. The fine copper wire strands are twisted into strands, and the strands are twisted into the required 5 types of wire specifications. The thin copper wire is annealed soft copper wire.

In order to further optimize the above technical solution, the semiconductive cable tie layer 2 is wrapped on the outside of the soft copper conductor 1 by using a gap wrapping technique. The semi-conductive tie layer 2 is of thin-wall type, and the gap is wrapped around the outside of the soft copper conductor 1 , which has the effect of fully tying the inner soft bundle and twisting the soft copper conductor 1 and balancing the electric field of the soft copper conductor 1 .

In order to further optimize the above technical solution, the inner semi-conductive shielding layer 3, the insulating layer 4 and the outer semi-conductive shielding layer 5 adopt three-layer co-extrusion technology, which are wrapped outside the semi-conductive cable tie layer 2, and are connected with the semi-conductive cable tie layer 2 and the outer semi-conductive shield layer 5. The soft copper conductor 1 constitutes a flexible insulated wire.

In order to further optimize the above technical solution, the three-layer co-extruded inner semi-conductive shielding layer 3 is of a peelable type, and the outer semi-conductive shielding layer 5 is of a non-peelable type.

In order to further optimize the above technical solution, the insulating layer 4 adopts a high-density polyethylene insulating material with a withstand voltage of 10KV, which has excellent electrical insulating properties.

In order to further optimize the above technical scheme, the metal overall shielding layer 6 is wound around the three-layer co-extruded outer semi-conductive shielding layer 5 with annealed soft copper wire bundles to shield external electromagnetic interference and ensure better operation of the internal flexible insulated wires.

In order to further optimize the above technical solution, the polyester tie 7 is a polyester PP tape layer, which plays the role of isolating and tying the inner layer around the metal overall shielding layer 6 .

In order to further optimize the above technical solutions, the outer protective cover 8 is made of a halogen-free, low-smoke, flame-retardant, and 105°C-resistant polyolefin outer sheath material, which has high physical and mechanical properties, and is environmentally friendly, flexible, high-pressure resistant, waterproof, oil-resistant, and resistant to high pressure. Abrasion and cut resistance properties.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant part can be referred to the description of the method.

The above description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (8)

1. A flexible oil-resistant and waterproof medium-voltage cable, characterized in that it comprises: a soft copper conductor in the center, and a semi-conductive cable tie layer, an inner semi-conductive shielding layer, an insulating layer that are successively covered by the soft copper conductor to the outside , Outer semi-conductive shield, metal overall shield, polyester cable ties and outer protective sleeve. 2 . The flexible oil-resistant and waterproof medium-voltage cable according to claim 1 , wherein the soft copper conductor is formed by twisting several thin copper wire bundles. 3 . 3 . The flexible oil-resistant and waterproof medium-voltage cable according to claim 1 , wherein the semi-conductive cable tie layer is wrapped on the outer layer of the soft copper conductor by using a gap wrapping technique. 4 . 4. The flexible oil-resistant and waterproof medium-voltage cable according to claim 1, wherein the inner semi-conductive shielding layer, the insulating layer and the outer semi-conductive shielding layer are coated on the semi-conductive shielding layer by three-layer co-extrusion technology. The outer layer of the conductive tie layer, together with the semiconductive tie layer and the soft copper conductor, constitutes a flexible insulated wire. 5 . The flexible oil-resistant and waterproof medium-voltage cable according to claim 1 , wherein the insulating layer adopts a high-density polyethylene insulating material that can withstand a voltage level of 10KV. 6 . 6 . The flexible oil-resistant and waterproof medium-voltage cable according to claim 1 , wherein the overall metal shielding layer is wound around the outer semiconducting shielding layer by using annealed soft copper wire bundles. 7 . 7 . The flexible oil-resistant and waterproof medium-voltage cable according to claim 1 , wherein the polyester cable tie is a polyester PP material cable tie layer, which is used for isolating and tightening the metal wire bundles that are wound. 8 . Shield. 8 . The flexible oil-resistant and waterproof medium-voltage cable according to claim 1 , wherein the outer protective sheath is made of a halogen-free, low-smoke, flame-retardant, and 105° C.-resistant polyolefin outer sheath material. 9 .

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