Insulation Aging Diagnosis System and Method Based on 10kv XLPE Cable
A diagnostic system and insulation aging technology, which is applied in the direction of testing dielectric strength, etc., can solve the problems that cannot reflect the aging state of cable insulation water tree, the characteristic quantity is not obvious, and the release speed of residual charge is slow, so as to achieve easy release, Prevention of insulation accidents, good detection effect
Active Publication Date: 2016-01-20
STATE GRID CORP OF CHINA +1
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Problems solved by technology
Among these methods, each method has its own advantages and disadvantages, and none of them can reflect the water tree aging state of cable insulation well.
In recent years, the off-line diagnosis method that uses water trees as the object of aging diagnosis has AC excitation residual charge method, but its main disadvantage is that the release speed of residual charge is slow and the characteristic quantity is not obvious.
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[0020] The implementation of the present invention will be described in further detail below with reference to the accompanying drawings. The following embodiments are only descriptive and not restrictive, and the protection scope of the present invention cannot be limited by this.
[0021] A 10kVXLPE cable-based insulation aging diagnosis system and method. The system includes: a water-containing tree 10kVXLPE cable, a DC power supply, a high-voltage pulse power supply and a data acquisition and processing unit, such as figure 1 As shown, one end of the water-containing tree 10kVXLPE cable core wire is connected to one end of switch S1, switch S2, and switch S3 through wires, the other end of switch S1 is connected to a DC power supply, the other end of switch S2 is grounded, and the other end of switch S3 is connected to high voltage pulse For the power supply, connect a resistor R between the outer side of the water-containing tree 10kVXLPE cable insulation layer near this end...
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The invention relates to an insulation aging diagnostic system and method based on a 10kV XLPE cable. The system comprises a water tree 10kV XLPE cable, a direct-current power supply, a high-voltage pulse power supply and a data collecting and processing unit. The method includes the steps that firstly, a negative direct-current voltage Vdc is exerted on the water tree 10kV XLPE cable; secondly, the high-voltage side of the cable is grounded, and trapped charges become residual charges in the grounding discharging process; thirdly, a high-voltage pulse voltage is exerted on the water tree 10kV XLPE cable, and voltage direct-current component signals on a resistor R are collected through the data collecting and processing unit, the time integral operation is performed, and the residual charge quality is obtained; fourthly, the water tree aging degree of the cable is judged according to the residual charge quantity. The insulation aging diagnostic system and method can well detect the water tree aging degree and is obvious in detection effect and capable of effectively preventing insulating accidents.
Description
Technical field [0001] The invention belongs to the technical field of analysis and diagnosis of insulation aging of cross-linked polyethylene cables, in particular to an insulation aging diagnosis system and method based on 10kV XLPE cables. Background technique [0002] The degree of cableization of urban power grids is an important indicator of the technical level of urban power grids, and it is also a necessary means to promote the rapid progress of urban civilization and improve the urban living environment. In the past 30 years, various technologies of power cables at home and abroad have developed rapidly, especially the development of three-layer co-extrusion production technology for manufacturing XLPE cables. Compared with oil-filled cables, XLPE cables require no oil supply equipment and have better fire resistance. , Simple installation and maintenance and good mechanical and electrical performance, etc., are adopted by more and more countries. At present, the cables...
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IPC IPC(8): G01R31/12
Inventor 何勇毛华李盛伟马力黄临存范伟王兆峰耿芳郭晋芳张梅侯彩龙
Owner STATE GRID CORP OF CHINA