CN105006294A - New type low voltage power transmission cable - Google Patents

Abstract

The invention discloses a new type low voltage power transmission cable which belongs to the technical field of power transmission cables. The transmission cable is used for the construction of underground routes of a residential place or a factory. The cable comprises conductors, a support framework, a fire retardant layer, an armor layer, and a water resisting layer. The conductors are wrapped in insulation layers. The insulation layers are wrapped in shielding layers. The support framework comprises support frames and bow shaped frames. The conductors are located in the filler between the adjacent support frames. Between the hollow cavity and the shielding layers is a buffering layer. The fire retardant layer is arranged at the outer side of the bow shaped frames of the support framework. The outer side of the fire retardant layer is provided with the armor layer. The outer side of the armor layer is provided with the water resisting layer. With such technical schemes, the cable of the invention can effectively help resolve various problems arising from the laying of underline pipes and the service lifetime of the cable can be effectively prolonged.

Description

New Low Voltage Transmission Cable

technical field

The invention belongs to the field of power transmission lines, and in particular relates to a novel low-voltage power transmission cable.

Background technique

With the development of science and technology, electricity plays an increasingly important role in residents' life and production activities. The general voltage of residential and factory electricity is 220-380V, because the cables used are rarely exposed to the ground, and most of them are located in underground pipelines. Traditional cables have not taken this into consideration in the design, resulting in relatively large cables during use. Many failures, or affect the service life due to the influence of the environment.

Contents of the invention

The purpose of the present invention is to provide a new type of low-voltage power transmission cable, which can effectively adapt to many problems existing in the process of laying underground pipelines, and can effectively improve the service life of the cable.

To achieve the above object, the present invention is achieved through the following technical solutions:

The new low-voltage power transmission cable described in the present invention includes a conductor, and also includes a supporting frame, a flame-retardant layer, an armor layer, and a water-blocking layer, wherein the outer surface of the conductor is covered with an insulating layer, and the outer surface of the insulating layer is covered with Shielding layer, the supporting frame includes a hollow cavity, a supporting bracket and an arc frame, and the conductor is located in the filler between adjacent supporting brackets; a buffer layer is provided between the hollow cavity and the shielding layer; the flame retardant layer It is arranged on the outside of the arc-shaped frame supporting the skeleton, an armor layer is arranged on the outside of the flame-retardant layer, and a water-blocking layer is arranged on the outside of the armor layer.

Further, the filler described in the present invention is composed of the following components by weight: 25-35 parts of high-density polyethylene, 15-2 parts of low-density polyethylene, 3-4 parts of vulcanizing agent, 2-4 parts of anti-aging agent 10-15 parts of paraffin oil, 3-4 parts of silicon dioxide, 1-2 parts of talcum powder, and 2-5 parts of stabilizer.

Further, the anti-aging agent described in the present invention adopts anti-aging agent 4010NA, and the described stabilizer adopts trilead tetraoxide.

Furthermore, the flame-retardant layer described in the present invention has a rectangular groove inside, and aluminum foil is embedded in the rectangular groove.

Furthermore, the insulating layer described in the present invention adopts a cross-linked polyethylene insulating layer, and the shielding layer is braided by steel wire and aluminum foil tape, and the steel wire and aluminum foil tape are covered with copper wire and glass fiber braided fabric. Mica tape.

Furthermore, the supporting framework described in the present invention adopts epoxy resin insulating material.

Furthermore, the cushioning layer described in the present invention is an elastic rubber material.

Compared with prior art, the beneficial effect of the present invention is:

The invention realizes the strength, waterproof and fire resistance of the transmission cable in the underground laying process by adding the flame-retardant layer, the water-blocking layer and the supporting frame, improves the adaptability of the cable to the underground pressure, and can effectively shield the electromagnetic interference generated by different transmission wires , to improve the stability of power transmission.

Description of drawings

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

In the figure: 1. Water blocking layer; 2. Armoring layer; 3. Flame retardant layer; 4. Rectangular groove; 5. Arc frame; 6. Shielding layer; 7. Insulating layer; 8. Conductor; ; 10, buffer layer; 11, optical fiber line; 12, pressure sensing line; 13, feedback line; 14, hollow cavity; 15, filler.

Detailed ways

The technical solutions described in the present application will be further described below in conjunction with the drawings and embodiments.

Embodiment 1: A new type of low-voltage power transmission cable, including a conductor 8, and also includes a supporting frame, a flame-retardant layer 3, an armor layer 2, and a water-blocking layer 1, wherein the outer surface of the conductor 8 is covered with an insulating layer 7, The insulating layer 7 is covered with a shielding layer 6, and the supporting frame includes a hollow cavity 14, a supporting bracket 9 and an arc frame 5, and the conductor 8 is located in the filler 15 between adjacent supporting brackets 9; the hollow cavity 14 and the shielding layer 6 are provided with a buffer layer 10; the flame-retardant layer 3 is arranged on the outside of the arc-shaped frame 5 supporting the skeleton, and an armored layer 2 is arranged on the outer side of the flame-retardant layer 3, and the outer side of the armored layer 2 A water blocking layer 1 is provided.

Embodiment 2: A new type of low-voltage power transmission cable, including a conductor 8, and also includes a supporting frame, a flame-retardant layer 3, an armor layer 2, and a water-blocking layer 1, wherein the outer surface of the conductor 8 is covered with an insulating layer 7, The insulating layer 7 is covered with a shielding layer 6, and the supporting frame includes a hollow cavity 14, a supporting bracket 9 and an arc frame 5, and the conductor 8 is located in the filler 15 between adjacent supporting brackets 9; the hollow cavity 14 and the shielding layer 6 are provided with a buffer layer 10; the flame-retardant layer 3 is arranged on the outside of the arc-shaped frame 5 supporting the skeleton, and an armored layer 2 is arranged on the outer side of the flame-retardant layer 3, and the outer side of the armored layer 2 A water blocking layer 1 is provided. The filler 15 is composed of the following ingredients in parts by weight: 25-35 parts of high-density polyethylene, 15-2 parts of low-density polyethylene, 3-4 parts of vulcanizing agent, 2-4 parts of anti-aging agent, 10-15 parts of paraffin oil 3-4 parts of silicon dioxide, 1-2 parts of talcum powder, and 2-5 parts of stabilizer. The anti-aging agent adopts anti-aging agent 4010NA, and the stabilizer adopts trilead tetraoxide. The flame retardant layer 3 has a rectangular slot 4 inside, and the rectangular slot 4 is embedded with aluminum foil. The insulating layer 7 is a cross-linked polyethylene insulating layer, and the shielding layer is braided by steel wire and aluminum foil tape, and a mica tape covered with copper wire and glass fiber braid is pasted on the steel wire and aluminum foil tape. The supporting frame adopts epoxy resin insulating material. The buffer layer 10 is made of elastic rubber material.

The filler 15 is composed of the following components by weight: 25-35 parts of high-density polyethylene, 15-2 parts of low-density polyethylene, 3-4 parts of vulcanizing agent, 2-4 parts of anti-aging agent, 10-15 parts of paraffin oil, 3-4 parts of silicon dioxide, 1-2 parts of talcum powder, and 2-5 parts of stabilizer. The anti-aging agent is anti-aging agent 4010NA, and the stabilizer is composed of trilead tetraoxide, which can realize the improvement of the filling in terms of resistance insulation rate, high temperature resistance, water resistance and flame retardancy under the premise of ensuring the insulation performance of the filling. Requirements, to achieve the improvement of cable life.

The support frame described in the present invention is made of rigid insulating material. In the present invention, epoxy resin insulating material or high-strength nylon material frame can be selected, but no matter what kind of material frame is selected, it is necessary to ensure the strength while requiring It has insulation performance and flame retardancy in line with national standards.

The aluminum foil embedded in the rectangular groove 4 in the present invention can not only increase the strength of the cable, but also can shield external electromagnetic signals, which is equivalent to adding a shielding layer in the flame retardant layer 3 . The rectangular slots 4 are evenly distributed between the flame-retardant layer 3 and the filler 15 , which will not affect the flame-retardant effect of the flame-retardant layer 3 while shielding electromagnetic signals.

The present invention is coated with a waterproof material on the outside, and is provided with a water-blocking layer and a flame-retardant layer made of a fireproof material inside, which can effectively solve the problems caused by water encounter and internal short circuit in the process of laying cables underground. The cable provided by the invention can effectively prolong the service life of the cable, and reduce the maintenance cost while increasing the service life.

Claims (7)

1. a New Low Voltage power transmission cable, comprise conductor (8), it is characterized in that: also comprise support frame, flame-retardant layer (3), armour (2), water blocking layer (1), the outer surface of wherein said conductor (8) is coated with insulating barrier (7), insulating barrier (7) is coated with screen (6), described support frame comprises cavity (14), supporting bracket (9) and arc frame (5), and conductor (8) is positioned at the filler (15) between adjacent supporting bracket (9); Resilient coating (10) is provided with between described cavity (14) and screen (6); Described flame-retardant layer (3) is arranged on the outside of the arc frame (5) of support frame, be provided with armour (2) in the outside of flame-retardant layer (3), the outside of armour (2) is provided with water blocking layer (1).

2. New Low Voltage power transmission cable according to claim 1, it is characterized in that: described filler (15) is made up of the composition of following weight portion: high density polyethylene (HDPE) 25 ~ 35 parts, low density polyethylene (LDPE) 15 ~ 2 parts, vulcanizing agent 3 ~ 4 parts, 2 ~ 4 parts, age resistor, paraffin oil 10 ~ 15 parts, silicon dioxide 3 ~ 4 parts, talcum powder 1 ~ 2 part, stabilizer 2 ~ 5 parts.

3. New Low Voltage power transmission cable according to claim 2, is characterized in that: described age resistor adopts antioxidant 4010NA, and described stabilizer adopts lead orthoplumbate.

4. New Low Voltage power transmission cable according to claim 3, is characterized in that: have rectangular channel (4) in described flame-retardant layer (3), and described rectangular channel (4) is embedded with aluminium foil.

5. New Low Voltage power transmission cable according to claim 4, it is characterized in that: described insulating barrier (7) adopts crosslinked polyetylene insulated layer, described screen adopts steel wire and aluminium foil strip to weave and forms, and posts the mica tape of surface coverage copper wire and fiberglass braided thing at steel wire and aluminium foil strip.

6. New Low Voltage power transmission cable according to claim 5, is characterized in that: described support frame adopts epoxy resin insulation material.

7. New Low Voltage power transmission cable according to claim 6, is characterized in that: described resilient coating (10) is elastic rubber material.