Application method of anti-corrosion pitch for 500kV power cable

A power cable and bitumen technology, applied in the field of 500kV power cable metal sheath bitumen anti-corrosion coating, can solve the problems of poor bitumen coating quality, uneven coating, easy to leak coating, etc., to achieve excellent anti-corrosion performance, Improve product quality and save costs

Inactive Publication Date: 2016-12-14
HANGZHOU CABLE
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Problems solved by technology

[0003] The present invention aims to overcome the problems of poor asphalt coating quality, uneven coating, and easy occurrence of mis

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  • Application method of anti-corrosion pitch for 500kV power cable

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[0014] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0015] A method for coating an asphalt anti-corrosion layer of a 500kV power cable, comprising the following steps:

[0016] Step 1: Select the cable asphalt that meets the technical requirements, add the asphalt into the container with the function of heating and temperature control, the asphalt container is divided into zone 1 and zone 2, zone 1 is the feeding zone, the asphalt is added to the container from zone 1, and the It is gradually heated to make it liquid and then flows into zone 2. Zone 2 is the temperature control zone.

[0017] Preferably, this step specifically includes: step 1-1: select qualified cable asphalt, with a softening point of 85°C to 100°C and a flash point of not less than 260°C; step 1-2: the asphalt container has two temperature control zones, one zone For the feeding area, the wall of the container is surrounded b...

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Abstract

The invention discloses an application method of anti-corrosion pitch for a 500kV power cable and aims to solve the problems that in the prior art, pitch for large-specification power cables is poor in application quality and is applied unevenly, and missing application is prone to occur. The method comprises the steps that the qualified cable pitch is selected and heated to the liquid state; the pitch in the liquid state is sprayed to the surface of a metal sheath in four radial directions of a cable core of the metal sheath of the cable; extruding application is conducted through a rubber mold; and then after being heated through a heater, the pitch enters a machine head of an extruding machine, so that the even pitch application process is completed. The method has the beneficial effects that a pitch anti-corrosion layer of the metal sheath is applied evenly; thickness consistency is good; the metal sheath is covered completely, and no missing application occurs; it is guaranteed that the metal protection layer of the cable is excellent in anti-corrosion property; and the surface of the outer sheath of the cable is god in quality.

Description

technical field [0001] The invention relates to the technical field of cable manufacturing, in particular to a method for coating an asphalt anticorrosion layer on a metal sheath of a 500kV power cable. Background technique [0002] At present, the asphalt anti-corrosion layer coating method for ultra-high voltage cables is not mature enough, and uneven coating of asphalt on the outer surface of the metal sheath is prone to occur during the manufacturing process. Leakage of coating will lead to the decline of the anti-corrosion performance of the metal sheath, and the long-term operation of the cable is prone to problems such as oxidation and corrosion of the metal sheath. Contents of the invention [0003] The present invention aims at overcoming the problems of poor asphalt coating quality, uneven coating, easy occurrence of missing coating and the like in the prior art, and provides a method for coating a 500kV ultra-high voltage cable asphalt anticorrosion layer. [0...

Claims

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Application Information

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IPC IPC(8): B05D1/02B05D3/02H01B13/22
CPCB05D1/02B05D3/0254H01B13/22
Inventor 魏学志滕兆丰张治刚石春静王昌英
Owner HANGZHOU CABLE
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