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A high-voltage cable seal lead water corrosion detection method and device

A high-voltage cable, corrosion detection technology, used in measuring devices, weather resistance/light resistance/corrosion resistance, instruments, etc., can solve problems such as damage to the insulation structure of power cables, and achieve reasonable design results

Active Publication Date: 2021-11-02
ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the heat-shrinkable protective tape on the outside of the power cable seal, it is difficult to judge whether there is corrosion by direct observation. The protective tape must be removed, resulting in damage to the insulation structure of the power cable.

Method used

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  • A high-voltage cable seal lead water corrosion detection method and device

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A high-voltage cable seal lead water ingress corrosion detection method, comprising the following steps:

[0037] Step 1. Wrap tinfoil in a spiral and overlapping manner at the lead seal of the high-voltage cable.

[0038] Such as figure 1 As shown, the corrugated protective sheath 2 and the outer sheath 1 are provided on the body of the existing high-voltage cable, and the lead seal 4 and the inner lining layer 5 are provided on the joint and the outer sheath 6 is provided.

[0039] In this embodiment, the tinfoil 3 is wrapped around the cable body at a distance of 30 cm from the lead sealing position of the high-voltage cable. The tinfoil is in a strip shape with a width of 20 cm. The wrapping degree of tinfoil is 1cm, and the tinfoil is wrapped all the way to the inner lining. After winding, there is a margin of 30cm above and below the lead seal of the high-voltage cable.

[0040] Step 2. Wrap the inflatable bag on the outer layer of tin foil, and use the air pum...

Embodiment 2

[0053] Based on the same inventive concept, the present invention also provides a high-voltage cable seal lead water ingress corrosion detection device, the problem-solving principle of which is similar to the above-mentioned high-voltage cable lead seal water ingress corrosion detection method, and the repetition will not be repeated.

[0054] The high-voltage cable seal lead water ingress corrosion detection device includes:

[0055] The winding module is used to wind the first tinfoil at the lead seal of the high-voltage cable;

[0056] The blowing module is used to wrap the inflatable bag on the outer layer of the first tinfoil and blow air into the inflatable bag until the inflatable bag is fully inflated, then stop injecting gas;

[0057] The deflation module is used to release the gas in the inflatable bag, and take out the first tinfoil for standby;

[0058] The winding module is also used to wind the second tinfoil at the lead seal of the high-voltage cable;

[0059...

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Abstract

The invention relates to a method and a device for detecting corrosion of high-voltage cable seal lead in water, comprising the following steps: wrapping tinfoil paper on the lead seal place of high-voltage cable; wrapping an inflatable bag on the outer layer of the tin foil paper and blowing air into the inflatable bag until the inflatable bag Fully inflated; release the gas in the air bag, and take out the tin foil for later use; wrap the tin foil around the cable seal, then wrap the air bag on the outer layer of the tin foil and blow air into the air bag. After the air bag is fully inflated, Keep the pressure in the inflatable bag for a period of time; release the gas in the inflatable bag, and take out the tinfoil; compare two pieces of tinfoil, and use the pressure deformation to judge the water corrosion of the cable seal lead. The invention uses the pressure deformation produced by the corrosion of the aluminum metal in the aluminum sheath of the cable, and prints out the deformation through the tinfoil paper and the inflatable bag, without peeling off the plastic outer sheath of the cable, thereby realizing the non-destructive corrosion of the high-voltage cable by water Sex detection function.

Description

technical field [0001] The invention belongs to the technical field of high-voltage electrical tests, in particular to a method and device for detecting corrosion of lead-inlet water in high-voltage cable seals. Background technique [0002] In the urban distribution network, considering the requirements for beautiful environment and power supply safety, overhead transmission lines are gradually replaced by power cables and laid underground. Since the power cables are laid in a humid environment such as the ground, they are easily corroded by the influence of moisture, especially in the lead-sealed positions of the cable joints and terminals, which are more likely to infiltrate moisture, resulting in the most serious corrosion in this position. Due to the heat-shrinkable protective tape on the outside of the power cable seal, it is difficult to judge whether there is corrosion by direct observation. The protective tape must be removed, resulting in damage to the insulation s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/00
Inventor 王浩鸣刘继平房晟辰孟峥峥于洋张静李文杰王昱力常文治杜非
Owner ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO
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