Overhead insulated cable

Abstract

The invention relates to the technical field of cables, and provides an overhead insulated cable which is composed of three layers including a conductor, an insulating layer and a sheath layer from inside to outside in sequence, and the sheath layer is prepared from the following raw materials in parts by weight: 60-70 parts of polycarbonate, 6-8 parts of an antioxidant, 10-15 parts of a flame retardant, 10-20 parts of filler, 0.5-1.5 parts of a coupling agent and 1-2 parts of a lubricant; and the water absorption rate of the polycarbonate is 0.2%-0.3%. According to the technical scheme, the problem of low insulation performance of the overhead insulated cable in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to an overhead insulated cable. Background Art

[0002] In today's power transmission field, overhead insulated cables play a vital role. With the rapid development of social economy, higher and higher requirements are put forward for the reliability, safety and efficiency of power supply. Traditional overhead bare wires expose many problems. For example, they are easily affected by external environmental factors, such as wind, rain, lightning in bad weather, etc., which can easily lead to line short circuits and grounding faults, seriously affecting the stability of power supply. At the same time, in densely populated areas, overhead bare wires have great safety hazards, which can easily cause electric shock accidents and pose a threat to people's lives and property. Therefore, the development of an overhead insulated cable that can improve the insulation performance and safety of the line is an urgent problem to be solved. Summary of the invention

[0003] The invention provides an overhead insulated cable, which solves the problem of low insulation performance of the overhead insulated cable in the related art.

[0004] The technical solution of the present invention is as follows: The present invention proposes an overhead insulated cable, which consists of three layers, from the inside to the outside, which are a conductor, an insulating layer and a sheath layer, and the sheath layer includes the following raw materials in parts by weight: 60-70 parts of polycarbonate, 6-8 parts of antioxidant, 10-15 parts of flame retardant, 10-20 parts of filler, 0.5-1.5 parts of coupling agent, and 1-2 parts of lubricant; The water absorption rate of the polycarbonate is 0.2% to 0.3%.

[0005] As a further technical solution, the conductor is made of aluminum.

[0006] As a further technical solution, the insulating layer is a cross-linked polyethylene insulating layer.

[0007] As a further technical solution, the raw material further includes an epoxy thiazole compound, and the mass ratio of the epoxy thiazole compound to the polycarbonate is 2-3:30.

[0008] In the present invention, epoxythiazole compounds are added and mixed with polycarbonate to form a more stable electric field distribution in the cable sheath layer, which helps to improve the resistivity of the cable, improve the insulation performance of the cable, and ensure safe and reliable power transmission.

[0009] As a further technical solution, the epoxy thiazole compound includes one or more of 4-(2,3-dihydro-benzo[1,4]dioxin-6-yl)-thiazol-2-amine, 4-[4-(oxiran-2-ylmethoxy)phenyl]-1,2,3-thiadiazole, and 4-benzo[1,3]dioxy-5-thiazol-2-amine.

[0010] As a further technical solution, the antioxidant includes one or more of antioxidant 1010 , antioxidant 1076 , and antioxidant 168 .

[0011] As a further technical solution, the flame retardant includes one or both of magnesium hydroxide and aluminum hydroxide.

[0012] As a further technical solution, the filler includes one or more of calcium carbonate, talcum powder, and mica powder.

[0013] As a further technical solution, the coupling agent includes one or both of silane coupling agent KH-171 and silane coupling agent KH-570.

[0014] As a further technical solution, the lubricant includes one or both of zinc stearate and calcium stearate.

[0015] The present invention also provides a method for preparing an overhead insulated cable, comprising the following steps: S1, mixing the raw materials of the sheath layer uniformly, and extruding to obtain a sheath layer; S2. Wrap the insulation layer and the sheath layer around the conductor in sequence to obtain a cable.

[0016] As a further technical solution, the extrusion temperature is 220-230°C.

[0017] The working principle and beneficial effects of the present invention are: In the present invention, polycarbonate with different water absorption rates is added as a raw material to enhance the ability of the overhead insulated cable to resist water intrusion, maintain a stable volume resistivity, reduce the risk of leakage caused by a decrease in volume resistivity, and improve the insulation performance of the cable. DETAILED DESCRIPTION

[0018] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In the following examples and comparative examples: Conductor material: Aluminum; Insulation layer: Cross-linked polyethylene insulation layer.

[0020] Example 1 The preparation of overhead insulated cables includes the following steps: S1. Weigh 60 parts of polycarbonate, 6 parts of antioxidant 1010, 10 parts of aluminum hydroxide, 10 parts of calcium carbonate, 0.5 parts of silane coupling agent KH-171, and 1 part of zinc stearate, mix them evenly, and extrude them at 220°C to obtain a sheath layer, in which the water absorption rate of polycarbonate is 0.2% (specific gravity is 1.2g / cm 3 , model number is LXTY1615, manufacturer is Luxi Chemical Group Co., Ltd.); S2. Wrap the insulation layer and the sheath layer around the conductor in sequence to obtain a cable.

[0021] Example 2 The preparation of overhead insulated cables includes the following steps: S1. Weigh 65 parts of polycarbonate, 7 parts of antioxidant 1076, 12 parts of aluminum hydroxide, 15 parts of talcum powder, 1 part of silane coupling agent KH-171, and 1.5 parts of zinc stearate, mix them evenly, and extrude them at 225°C to obtain a sheath layer, in which the water absorption rate of polycarbonate is 0.2% (specific gravity is 1.2g / cm 3 , model number is LXTY1615, manufacturer is Luxi Chemical Group Co., Ltd.); S2. Wrap the insulation layer and the sheath layer around the conductor in sequence to obtain a cable.

[0022] Example 3 The preparation of overhead insulated cables includes the following steps: S1. Weigh 70 parts of polycarbonate, 8 parts of antioxidant 168, 15 parts of magnesium hydroxide, 20 parts of mica powder, 1.5 parts of silane coupling agent KH-570, and 2 parts of calcium stearate, mix them evenly, and extrude them at 230°C to obtain a sheath layer, in which the water absorption rate of polycarbonate is 0.2% (specific gravity is 1.2g / cm 3 , model number is LXTY1615, manufacturer is Luxi Chemical Group Co., Ltd.); S2. Wrap the insulation layer and the sheath layer around the conductor in sequence to obtain a cable.

[0023] Example 4 Compared with Example 1, the difference of Example 4 is that the water absorption rate of polycarbonate is 0.3% (specific gravity is 1.19 g / cm 3 , model 2205, manufacturer is Covestro Polymer Co., Ltd.).

[0024] Example 5 The preparation of overhead insulated cables includes the following steps: S1. Weigh 60 parts of polycarbonate, 6 parts of antioxidant 1010, 10 parts of aluminum hydroxide, 10 parts of calcium carbonate, 0.5 parts of silane coupling agent KH-171, 1 part of zinc stearate, and 2 parts of 4-(2,3-dihydro-benzo[1,4]dioxin-6-yl)-thiazole-2-amine, mix them evenly, and extrude them at 150°C to obtain a sheath layer, in which the water absorption rate of polycarbonate is 0.3% (specific gravity is 1.19 g / cm 3 , model number is PC2205, manufacturer is Covestro Polymer Co., Ltd.); S2. Wrap the insulation layer and the sheath layer around the conductor in sequence to obtain a cable.

[0025] Example 6 Compared with Example 5, the difference of Example 6 is that the added amount of 4-(2,3-dihydro-benzo[1,4]dioxin-6-yl)-thiazol-2-amine is 4 parts.

[0026] Example 7 Compared with Example 5, the difference of Example 7 is that the added amount of 4-(2,3-dihydro-benzo[1,4]dioxin-6-yl)-thiazol-2-amine is 6 parts.

[0027] Example 8 Compared with Example 5, the difference in Example 8 is that the added amount of 4-(2,3-dihydro-benzo[1,4]dioxin-6-yl)-thiazol-2-amine is 8 parts.

[0028] Example 9 Compared with Example 7, Example 9 is different in that 4-(2,3-dihydro-benzo[1,4]dioxin-6-yl)-thiazol-2-amine is replaced with an equal amount of 4-[4-(oxiran-2-ylmethoxy)phenyl]-1,2,3-thiadiazole.

[0029] Example 10 Compared with Example 7, Example 10 is different in that 4-(2,3-dihydro-benzo[1,4]dioxin-6-yl)-thiazol-2-amine is replaced with an equal amount of 4-benzo[1,3]dioxo-5-thiazol-2-amine.

[0030] Comparative Example 1 Compared with Example 1, the difference of Comparative Example 1 is that the water absorption rate of polycarbonate is 0.15% (specific gravity is 1.2 g / cm 3 , model number is 1201-10, manufacturer is LG Chemical Enterprise Co., Ltd.).

[0031] Comparative Example 2 Compared with Example 1, the difference in Comparative Example 2 is that the water absorption rate of the polycarbonate is 0.35% (specific gravity is 1.2 g / cm 3 , model 945A-116, manufacturer is Saudi Basic Industries Corporation).

[0032] The overhead insulated cables prepared in Examples 1 to 10 and Comparative Examples 1 to 2 were tested according to the following method: 1. Voltage test: According to the test method specified in GB / T 12527-2008 "Overhead insulated cables with rated voltage of 1 kV and below", the test sample shall be subjected to a voltage test under the test conditions of 3.5 kV and 1 min.

[0033] 2. Insulation resistance (90℃): Test the insulation resistance of the sample according to the test method specified in GB / T 12527-2008 "Overhead insulated cables with rated voltage of 1kV and below".

[0034] The test results are shown in the following table: Table 1 Performance test results of overhead insulated cables prepared in Examples 1 to 10 and Comparative Examples 1 to 2

[0035] Compared with Example 1, Comparative Examples 1, 2 and Example 4 added polycarbonates with different water absorption rates. As a result, the voltage tests of Example 1 and Example 4 did not show breakdown, while the voltage tests of Comparative Examples 1 and 2 showed breakdown. Moreover, the insulation resistance of Example 1 and Example 4 was better than that of Comparative Examples 1 and 2, indicating that when the water absorption rate of polycarbonate is 0.2%~0.3%, the insulation performance of the obtained overhead insulated cable is better.

[0036] Compared with Example 4, Examples 5 to 8 added different masses of 4-(2,3-dihydro-benzo[1,4]dioxin-6-yl)-thiazole-2-amine. As a result, the insulation resistance of Examples 6 and 7 was better than that of Examples 5 and 8, indicating that when the mass ratio of 4-(2,3-dihydro-benzo[1,4]dioxin-6-yl)-thiazole-2-amine to polycarbonate was 2 to 3:30, the insulation performance of the obtained overhead insulated cable was better.

[0037] Compared with Example 7, Example 9 adds 4-[4-(oxiran-2-ylmethoxy)phenyl]-1,2,3-thiadiazole to replace 4-(2,3-dihydro-benzo[1,4]dioxin-6-yl)-thiazol-2-amine, and Example 10 adds 4-benzo[1,3]dioxy-5-thiazol-2-amine to replace 4-(2,3-dihydro-benzo[1,4]dioxin-6-yl)-thiazol-2-amine. As a result, the insulation resistance of Example 10 is better than that of Examples 7 and 9, indicating that when 4-benzo[1,3]dioxy-5-thiazol-2-amine is added, the insulation performance of the obtained overhead insulated cable is better.

[0038] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An overhead insulated cable, characterized in that: The invention is composed of three layers, which are, from the inside to the outside, a conductor, an insulating layer and a sheath layer. The sheath layer comprises the following raw materials in parts by weight: 60-70 parts of polycarbonate, 6-8 parts of antioxidant, 10-15 parts of flame retardant, 10-20 parts of filler, 0.5-1.5 parts of coupling agent and 1-2 parts of lubricant. The water absorption rate of the polycarbonate is 0.2%-0.3%.

2. An overhead insulated cable according to claim 1, characterized in that: The material of the conductor is aluminum.

3. An overhead insulated cable according to claim 1, characterized in that: The insulating layer is a cross-linked polyethylene insulating layer.

4. An overhead insulated cable according to claim 1, characterized in that: The raw materials also include epoxy thiazole compounds, and the mass ratio of the epoxy thiazole compounds to the polycarbonate is 2-3:

30.

5. An overhead insulated cable according to claim 4, characterized in that: The epoxy thiazole compound includes one or more of 4-(2,3-dihydro-benzo[1,4]dioxin-6-yl)-thiazol-2-amine, 4-[4-(oxiran-2-ylmethoxy)phenyl]-1,2,3-thiadiazole, and 4-benzo[1,3]dioxy-5-thiazol-2-amine.

6. An overhead insulated cable according to claim 1, characterized in that: The antioxidant includes one or more of antioxidant 1010 , antioxidant 1076 , and antioxidant 168 .

7. An overhead insulated cable according to claim 1, characterized in that: The flame retardant includes one or both of magnesium hydroxide and aluminum hydroxide.

8. An overhead insulated cable according to claim 1, characterized in that: The filler includes one or more of calcium carbonate, talcum powder and mica powder.

9. The overhead insulated cable according to claim 1, characterized in that: The coupling agent includes one or both of silane coupling agent KH-171 and silane coupling agent KH-570.

10. An overhead insulated cable according to claim 1, characterized in that: The lubricant includes one or both of zinc stearate and calcium stearate.

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