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Non-intrusive online automatic maintenance and defect repair system for high-voltage transmission cables

A high-voltage power transmission, non-intrusive technology, applied in the direction of insulation/armored cable repair equipment, etc., can solve the problems of long span, difficult maintenance, manpower and material resources, etc., to reduce the failure rate, low manufacturing costs, and improve the use of effect of life

Active Publication Date: 2017-06-23
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, EHV and UHV DC transmission cables bear heavy loads and have long spans. Most of the transmission corridors are distributed underground in wilderness and mountainous areas. Regular off-line manual maintenance is difficult to achieve and consumes a lot of manpower and material resources.
For the on-line repair of insulation defects in transmission cables, there is no effective technology for cable insulation repair, and insulating materials with self-repair functions need further research

Method used

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  • Non-intrusive online automatic maintenance and defect repair system for high-voltage transmission cables
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  • Non-intrusive online automatic maintenance and defect repair system for high-voltage transmission cables

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Embodiment Construction

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0026] In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand...

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Abstract

A non-invasive high-voltage power transmission cable online automatic maintenance and defect repair system. The system comprises: a high-voltage power transmission cable (101) having a polypropylene-iron oxide nanocomposite material as an insulation material; and multiple non-invasive high-frequency current excitation devices (102, 103, . . . , 10N). The multiple non-invasive high-frequency current excitation devices are arranged at an equal distance therebetween, and each non-invasive high-frequency current excitation device surrounds the high-voltage power transmission cable, and is configured to non-invasively inject a high-frequency current into the high-voltage power transmission cable, and to automatically realize magnetic heating and heat insulation of the polypropylene-iron oxide nanocomposite material, so as to autonomously repair an initial electrical tree defect in the insulation material. The system can increase the service life of a power transmission cable, reduce a failure rate of a power transmission system and improve the reliability of the power transmission system.

Description

technical field [0001] The invention relates to the technical field of polymer insulated cable maintenance, in particular to a non-invasive online automatic maintenance and defect repair system for high-voltage transmission cables. Background technique [0002] High-voltage transmission cables are prone to insulation defects caused by overvoltage, ripple and other external environment during long-term operation. Especially for DC cables, discharges occur due to the accumulation of space charges inside the insulation, forming micro-defects. Even under ideal operating conditions, due to the inevitable introduction of impurity defects in the insulating medium during the cable manufacturing process, it will develop into insulation damage under the action of a strong electric field. These insulation defects will develop into electrical branches during long-term operation or under the action of a strong electric field, and quickly penetrate the insulating medium, causing prematur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02G1/16
CPCH02G1/16
Inventor 何金良胡军杨洋张波余占清
Owner TSINGHUA UNIV
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