Polypropylene insulated cable

Abstract

The utility model discloses a polypropylene insulated cable. The polypropylene insulated cable comprises conductors; a temperature measuring optical fiber penetrates through the center of the conductor; the periphery of the conductor is wrapped with a wrapping shielding layer; a conductor shielding layer is extruded on the periphery of the wrapping shielding layer; a polypropylene insulating layer for insulating the conductor is extruded on the periphery of the conductor shielding layer; the periphery of the polypropylene insulating layer is wrapped with an insulating shielding layer; the periphery of the insulation shielding layer is provided with a longitudinal group water layer used for improving the water resistance of the cable. A metal sheath layer is arranged on the periphery of the longitudinal group water layer; the periphery of the metal sheath layer is wrapped by an outer sheath layer. And a hot melt adhesive layer for improving the adhesiveness between the outer sheath layer and the metal sheath layer is arranged between the metal sheath layer and the outer sheath layer. The polypropylene insulated cable provided by the utility model can effectively improve the power transmission capability, can monitor the temperature of the conductor in real time through the temperature measurement optical fiber, and is safer in operation.

Description

Technical Field

[0001] The utility model relates to a polypropylene insulated cable. Background Art

[0002] In recent years, the development of cross-linked polyethylene power cables has become relatively mature, but the maximum operating temperature of the XLPE insulation used is only 90°C, and it cannot be recycled, and the chemical cross-linking process produces cross-linking byproducts. Due to the high load density and rapid growth rate in urban areas, the transmission capacity of the existing power grid in some developed cities can no longer meet the needs of urban development, and it is inevitable to increase the transmission capacity of cable lines. However, the existing cross-linked polyethylene power cables have limited high temperature tolerance and cannot meet this demand. Utility Model Content

[0003] The utility model provides a polypropylene insulated cable to solve the above-mentioned technical problems, and specifically adopts the following technical solutions:

[0004] A polypropylene insulated cable comprises: a conductor; a temperature measuring optical fiber for detecting the temperature of the conductor is passed through the center of the conductor; a wrapping shielding layer for insulation shielding is wrapped around the outer periphery of the conductor; a conductor shielding layer for homogenizing the electric field on the conductor surface to prevent electric field distortion and improve the smoothness and roundness of the outer interface of the wrapping shielding layer is extruded on the outer periphery of the wrapping shielding layer; a polypropylene insulating layer for insulating the conductor is extruded on the outer periphery of the conductor shielding layer; an insulating shielding layer for homogenizing the electric field on the insulation surface to prevent electric field distortion and improve the smoothness and roundness of the outer interface of the polypropylene insulating layer is wrapped on the outer periphery of the polypropylene insulating layer; a longitudinal water-forming layer for improving the water-blocking property of the cable is arranged on the outer periphery of the insulating shielding layer; a metal sheath layer is arranged on the outer periphery of the longitudinal water-forming layer; an outer sheath layer is wrapped on the outer periphery of the metal sheath layer; a hot melt adhesive layer for improving the adhesion between the outer sheath layer and the metal sheath layer is arranged between the metal sheath layer and the outer sheath layer.

[0005] Furthermore, the wrapped shielding layer is formed by wrapping a semi-conductive nylon tape.

[0006] Furthermore, the wrapped shielding layer includes two layers of semi-conductive nylon tape; the two layers of semi-conductive nylon tape are stacked.

[0007] Further, the conductor shielding layer is composed of an ultra-smooth semi-conductive material.

[0008] Further, the insulating shielding layer is composed of an ultra-smooth semi-conductive material.

[0009] Furthermore, the longitudinal water-forming layer includes: three layers of semi-conductive buffer water-blocking tapes; the three layers of semi-conductive buffer water-blocking tapes are alternately stacked.

[0010] Furthermore, the metal sheath layer is wound by a copper sheath with a smooth surface.

[0011] Furthermore, the outer sheath layer consists of a sheath layer and a graphite electrode layer; the sheath layer is made of highly flame-retardant polyvinyl chloride material; and the graphite electrode layer is arranged on the outside of the sheath layer.

[0012] Furthermore, a glass fiber filling layer for blocking heat is filled between the conductor and the wrapped shielding layer.

[0013] The utility model is beneficial in that the provided polypropylene insulated cable has strong high temperature resistance, can effectively improve power transmission capacity, and can monitor the conductor temperature in real time through temperature measuring optical fiber, thereby improving power transmission while controlling the safety of cable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 It is a structural schematic diagram of a polypropylene insulated cable involved in the present application;

[0016] Polypropylene insulated cable 10, conductor 11, temperature measuring optical fiber 12, wrapped shielding layer 13, conductor shielding layer 14, polypropylene insulation layer 15, insulation shielding layer 16, longitudinal water-filled layer 17, metal sheath layer 18, hot melt adhesive layer 19, outer sheath layer 20, sheath layer 201, graphite electrode layer 202, glass fiber filling layer 21. DETAILED DESCRIPTION

[0017] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0018] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0020] like Figure 1 As shown, a polypropylene insulated cable 10 of the present application includes: a conductor 11, a temperature measuring optical fiber 12 is inserted in the center of the conductor 11, and the temperature of the conductor 11 can be detected by the temperature measuring optical fiber 12, so that during long-term use, the temperature of the conductor 11 can be monitored in real time. When the monitored temperature is too high, the current flow in the conductor 11 can be controlled by the control circuit, so as to adjust the temperature of the conductor 11, thereby ensuring the overall safety of the cable, avoiding long-term high temperature damage to the line, extending the service life of the cable, and reducing the transmission and maintenance costs.

[0021] A wrapping shielding layer 13 is wrapped around the outer periphery of the conductor 11 for insulation shielding. The wrapping shielding layer 13 is formed by wrapping a semi-conductive nylon tape. The wrapping shielding layer 13 includes two layers of semi-conductive nylon tape layers, which are stacked. The wrapping shielding layer 13 is wrapped with two overlapping layers of the semi-conductive nylon tape layers, which can provide a smoother interface for subsequent insulation extrusion.

[0022] The outer periphery of the wrapped shielding layer 13 is extruded with a conductor shielding layer 14. The conductor shielding layer 14 is made of ultra-smooth semi-conductive material, which can homogenize the electric field on the surface of the conductor 11 to prevent electric field distortion and improve the smoothness and roundness of the outer interface of the wrapped shielding layer 13, thereby avoiding the generation of partial discharge.

[0023] The conductor shielding layer 14 is extruded with a polypropylene insulation layer 15 to insulate the conductor 11. The polypropylene insulation layer 15 is made of polypropylene material, which has a high temperature resistance and can effectively improve the current carrying capacity of the cable. Polypropylene material has excellent insulation performance, a higher temperature resistance (105°C), and can be plasticized and recycled. It not only has great advantages in improving the current carrying capacity, but also has unique advantages in simplifying the processing technology, reducing costs, and increasing production speed.

[0024] The outer periphery of the polypropylene insulation layer 15 is wrapped with an insulation shielding layer 16, which is also made of ultra-smooth semi-conductive material. This can homogenize the electric field on the insulation surface to prevent electric field distortion and improve the smoothness and roundness of the outer interface of the polypropylene insulation layer 15, thereby further avoiding the occurrence of partial discharge.

[0025] A longitudinal water-blocking layer 17 is provided on the outer periphery of the insulating shielding layer 16 to improve the water-blocking property of the cable. The longitudinal water-blocking layer 17 includes three layers of semi-conductive buffer water-blocking tapes, which are alternately stacked to effectively improve the water-blocking effect.

[0026] The outer periphery of the longitudinal water-forming layer 17 is provided with a metal sheath layer 18. The metal sheath layer 18 is wound by a copper sheath with a smooth surface, which can avoid damaging the insulating core during corrugation and can also save the amount of outer sheath material.

[0027] The outer circumference of the metal sheath layer 18 is covered with an outer sheath layer 20, which is composed of a sheath layer 201 and a graphite electrode layer 202. The sheath layer 201 is made of highly flame-retardant polyvinyl chloride material, and the graphite electrode layer 202 is arranged on the outside of the sheath layer 201. When the outer sheath layer is subjected to a pressure test, the graphite electrode layer 202 serves as an electrode for the sheath pressure test. With the combination of the metal sheath layer 18 and the outer sheath layer 20, the flame retardant and fire resistant performance of the cable of the internal technical solution is more excellent.

[0028] A hot melt adhesive layer 19 is provided between the metal sheath layer 18 and the outer sheath layer 20 to improve the adhesion between the outer sheath layer 20 and the metal sheath layer 18 , that is, the outer sheath layer 20 and the metal sheath layer 18 can be better bonded together.

[0029] As a specific implementation, a glass fiber filling layer 21 is filled between the conductor 11 and the wrapped shielding layer 13 to block heat, thereby reducing the impact of the high temperature of the conductor 11 on the outer layer structure.

[0030] The polypropylene insulation layer 15 of the polypropylene insulated cable 10 of this solution adopts polypropylene insulation material, which has excellent insulation performance and high temperature resistance, has great advantages in improving current carrying capacity, and is more suitable for power line transmission. The temperature measuring optical fiber 12 can realize real-time monitoring of the temperature of the conductor 11 during cable operation. While it has high temperature resistance, it can also monitor the temperature in real time through the temperature measuring optical fiber 12, and then control the temperature according to the temperature data, which is safer to use. In addition, this solution uses the combination of the metal sheath layer 18 and the outer sheath layer 20 to make the overall flame retardant and fire resistant performance of the cable more excellent.

[0031] Therefore, the above-mentioned polypropylene insulated cable 10 has strong high temperature resistance, can effectively improve the power transmission capacity, and can monitor the temperature of the conductor 11 in real time through the temperature measuring optical fiber 12, so as to control the safety of cable operation while improving power transmission.

[0032] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the above embodiments do not limit the utility model in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the utility model.

Claims

1. A polypropylene insulated cable, characterized in that: include: conductor; A temperature measuring optical fiber for detecting the temperature of the conductor is passed through the center of the conductor; The outer periphery of the conductor is wrapped with a wrapping shielding layer for insulation shielding; The outer periphery of the wrapped shielding layer is extruded with a conductor shielding layer for homogenizing the electric field on the surface of the conductor to prevent electric field distortion and improve the smoothness and roundness of the outer interface of the wrapped shielding layer; The outer periphery of the conductor shielding layer is extruded with a polypropylene insulation layer for insulating the conductor; The outer periphery of the polypropylene insulation layer is provided with an insulation shielding layer for homogenizing the electric field on the insulation surface to prevent electric field distortion and improve the smoothness and roundness of the outer interface of the polypropylene insulation layer; The outer periphery of the insulating shielding layer is provided with a longitudinal water-forming layer for improving the water resistance of the cable; The outer periphery of the longitudinal water-forming layer is provided with a metal sheath layer; The outer periphery of the metal sheath layer is covered with an outer sheath layer; A hot melt adhesive layer is provided between the metal sheath layer and the outer sheath layer for improving the adhesion between the outer sheath layer and the metal sheath layer.

2. The polypropylene insulated cable according to claim 1, characterized in that: The wrapped shielding layer is a semi-conductive nylon tape layer formed by wrapping a semi-conductive nylon tape.

3. The polypropylene insulated cable according to claim 2, characterized in that: The wrapping shielding layer comprises two layers of the semi-conductive nylon tape; The two layers of the semi-conductive nylon tape are stacked.

4. The polypropylene insulated cable according to claim 1, characterized in that: The conductor shielding layer is made of an ultra-smooth semi-conductive material.

5. The polypropylene insulated cable according to claim 1, characterized in that: The insulating shielding layer is made of an ultra-smooth semi-conductive material.

6. The polypropylene insulated cable according to claim 1, characterized in that: The longitudinal water-forming layer comprises: three layers of semi-conductive buffer water-blocking tape; The three layers of the semi-conductive buffer water-blocking tapes are arranged in an alternating and overlapping manner.

7. The polypropylene insulated cable according to claim 1, characterized in that: The metal sheath layer is formed by winding a copper sheath with a smooth surface.

8. The polypropylene insulated cable according to claim 1, characterized in that: The outer sheath layer consists of a sheath layer and a graphite electrode layer; The sheath layer is made of highly flame-retardant polyvinyl chloride material; The graphite electrode layer is arranged on the outer side of the sheath layer.

9. The polypropylene insulated cable according to claim 1, characterized in that: A glass fiber filling layer for blocking heat is filled between the conductor and the wrapped shielding layer.

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