Removing method for air in crosslinked polyethylene insulation power cable

A cross-linked polyethylene and power cable technology, which is applied in the direction of cable/conductor manufacturing, electrical components, conductor/cable insulation, etc., can solve the problems of long time spent, rising cost, increased drying cost, etc., and achieves short time , saving cost and avoiding hidden dangers in quality

Inactive Publication Date: 2009-03-25
圣安电缆有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This exhaust method usually takes a long time, and the drying in th...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Take 100m of XLPE insulated cable of 220KV cross-linked polyethylene insulated cable with bulging phenomenon and gas inside, commonly known as fat semi-finished product, put the sealing cap of the gas pipe outlet of the nitrogen gas cylinder on one end of the cable, and open the other end of the cable to keep the pressure in the nitrogen gas cylinder at 2.5 MPa, nitrogen purity 99.5%; open the valve of the nitrogen cylinder, the gas in the semi-finished cable is slowly squeezed out by the high-pressure nitrogen, the bulge slowly disappears, until the bulge disappears completely, just close the valve, and the whole process lasts for 5 hours.

Embodiment 2

[0012] Take a 150m XLPE insulated cable of 110KV that has a bulging phenomenon and has gas inside, which is commonly known as a fat semi-finished product. Put the sealing cap of the gas pipe outlet of the nitrogen cylinder on one end of the cable, and open the other end of the cable to keep the pressure in the nitrogen cylinder at 2MPa. , the purity of nitrogen is 99.8%; open the valve of the nitrogen bottle, the gas in the semi-finished cable is slowly squeezed out by high-pressure nitrogen, and the bulge slowly disappears. When the bulge disappears completely, just close the valve. The whole process lasts for 5 hours.

Embodiment 3

[0014] Take 200m of XLPE insulated cable of 35KV cross-linked polyethylene insulated cable with bulging phenomenon and gas inside, which is commonly known as fat semi-finished product. Put the sealing cap of the gas pipe outlet of the nitrogen gas cylinder on one end of the cable, and open the other end of the cable to keep the pressure in the nitrogen gas cylinder at 1.5 MPa, nitrogen purity 99.9%; open the valve of the nitrogen cylinder, the gas in the semi-finished cable is slowly squeezed out by the high-pressure nitrogen, and the bulge slowly disappears. When the bulge disappears completely, just close the valve. The whole process lasts for 5 hours.

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PUM

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Abstract

The invention discloses a method of excluding gas from a cross-linked polyethylene insulated power cable. The method comprises the following steps: one end of a cable, which is a semi-finished article with a bulge after passing through an extruding machine, is communicated with an outlet formed on a gas pipe of a nitrogen cylinder, the pressure of the nitrogen cylinder is 1 to 2.5 MPa, and the other end of the cable is kept opened; the valve of the nitrogen cylinder is opened to allow the gas to continuously flow out from an opening end of the cable with the bulge beginning to disappear slowly, and the valve can be closed until the bulge has no gas to flow out. The method has the advantages of short time and good effect on excluding gas when the method is adopted to exclude the gas from the cross-linked polyethylene insulated power cable, and can totally exclude the gas existed between a cable sheath and insulated shielding, thereby avoiding potential quality troubles of the cable; the method greatly reduces the drying cost of a drying house through adopting high-pressure nitrogen to exclude the gas, thereby saving cost; and the method has the advantages of simple technology and convenient operation.

Description

technical field [0001] The invention relates to a method for removing gas in cables, in particular to a method for removing gas in XLPE insulated power cables. Background technique [0002] The current XLPE insulated power cables are widely used in power transmission lines. Medium-voltage, high-voltage and ultra-high-voltage XLPE insulated power cables are cross-linked by chemical methods. During the cross-linking process, a gas called acetophenone will be produced. If the acetophenone gas is not exhausted Then it flows into the next process and is processed into a finished product. In this way, a large amount of gas will be filled between the cable sheath and the insulation shield, the outer diameter of the cable will increase greatly, and a bulge will appear, commonly known as "fat". This cross-linked cable filled with gas must be disposed of, so there should be a degassing process in production, such as using a vacuum method to exhaust, this method is easy to reduce the ...

Claims

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Application Information

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IPC IPC(8): H01B13/14H01B13/24
Inventor 马正厚
Owner 圣安电缆有限公司
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