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Online insulating property repairing method and device during operation of crosslinked polyethylene power cables

A technology of cross-linked polyethylene and power cables, which is applied in the direction of insulation/armored cable repair equipment, etc., can solve the problems that the injection pressure of the repair fluid cannot be kept constant, the time for cable power outage maintenance is increased, and the repair effect is weakened, so as to shorten the power outage Maintenance time, improvement of repair effect, low cost effect

Active Publication Date: 2017-05-31
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology still has the following deficiencies: First, with the injection of repair fluid, the inert pressure in the gas pressure tank gradually decreases. In the case of long-term repair, the injection pressure of the repair fluid cannot be guaranteed to be constant, which weakens the repair effect; It takes a certain amount of time after the patent repair liquid is injected to ensure the effective penetration of the repair liquid and react with water. The power outage time is too long, which increases the time for cable power outage maintenance.

Method used

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  • Online insulating property repairing method and device during operation of crosslinked polyethylene power cables
  • Online insulating property repairing method and device during operation of crosslinked polyethylene power cables
  • Online insulating property repairing method and device during operation of crosslinked polyethylene power cables

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] An on-line repair device for the insulation performance of a cross-linked polyethylene power cable during operation, comprising a repair liquid storage tank, a conduit and a cable terminal adapter, and the conduit is used to connect the repair liquid injection hole to the repair liquid storage tank liquid outlet connected; the adapter is provided with a restoration fluid injection hole communicating with its inner cavity, and the conduit is used to connect the restoration fluid injection hole with the outlet of the restoration fluid storage tank.

[0066] As an option, in the above-mentioned online repairing device, the adapter is in the shape of a cylinder and has an inner cavity through which both ends are connected, and the size of the inner cavity matches the outer diameter of the cable to be repaired, and can be sleeved on the terminal joint of the cable to be repaired place.

[0067] As an optional mode, fastening devices are provided at both ends of the adapter, ...

Embodiment 2

[0079] Example of online repair of cross-linked polyethylene

[0080] (1) power off

[0081] Cut off the power supply of the cable to be repaired, and take safety measures in accordance with the power cable operation regulations;

[0082] (2) Repair device connection

[0083] In the state of power failure, install a support frame made of insulating materials such as wood or plastic near the cable terminal, hang the repair liquid tank with a liquid level indicator and a pressure balance tube on the support frame, and then connect the copper nose of the cable terminal with the The gap between the insulation layers and the gap between the conductor connecting pipe and the insulation layer are exposed. Install the terminal adapter at the terminal joint at both ends of the cable. The repair fluid injection hole on the adapter is connected to the repair fluid storage tank through a hose. The storage tank is suspended above the location of the cable terminations;

[0084] (3) Prep...

Embodiment 3

[0102] Select any online repair device described in Example 1, first connect the two ends of the cable to be repaired to the repair device in the power-off state, so that the repair liquid can penetrate into the cable, and ensure that the repair liquid injection device can continue Fill the cable to be repaired with repair liquid, switch on and transmit power, and keep the repair liquid injected during the power-on process. After repairing for a period of time (2 months), turn off the power and remove the online repair device.

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Abstract

The invention discloses an online insulating property repairing method and device during operation of crosslinked polyethylene power cables and belongs to the field of cable insulation repairing. According to the online repairing method, in the cable operation process, the cables are filled with a repairing solution, that is, an electric field is provided in the cable repairing process, a water tree channel is opened, the repairing effect is better, the cable power outage repairing time is shortened, meanwhile, the cable is in both working and repairing states, and the cable operation reliability is improved. The repairing manner is characterized in that the electric field is applied to the cables, the cable repairing effect is improved, the cable power-outage maintenance time is obviously shortened, the medium and long-term repairing effect of cables as well as the repairing effect of long-distance and small-section cables are good, and the method and the device have the advantages of being advanced in technology, safe, stable, low in cost and wide in application range.

Description

technical field [0001] The invention relates to an on-line repair method and device for the insulation performance of cross-linked polyethylene power cables during voltage-applied operation, which belongs to the field of cable insulation repair and can be used in repair projects for cross-linked polyethylene power cables after long-term operation and insulation aging. [0002] technical background [0003] Cross-linked polyethylene (XLPE) power cables have reliable electrical and mechanical properties, so they have been widely used in urban power grids in my country. However, with the increase of the operating life of cables, the XLPE cables used in large quantities in the 1990s in my country have gradually entered a period of high incidence of aging failures. The early power cable manufacturing process was not high and the water resistance was not good. There were inevitably some microscopic defects in the cable body, and these defects often became the trigger point of water...

Claims

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Application Information

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IPC IPC(8): H02G1/16
CPCH02G1/16
Inventor 周凯陈讴黄明李天华陈泽龙
Owner SICHUAN UNIV
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