Method for detecting radial damage of cable based on VLF voltage spectrum
A detection method and voltage spectrum technology, applied in the field of cable radial damage detection, can solve problems such as the inability to accurately evaluate the cable insulation state, the measurement results are susceptible to environmental interference, and the lack of diagnostic methods for insulation radial damage
Active Publication Date: 2018-11-16
SOUTHWEST JIAOTONG UNIV
View PDF8 Cites 5 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] At present, cable insulation fault diagnosis mostly focuses on the research on the insulation state of cable accessories, mainly through the method of partial discharge to study the insulation state of cables. However, there is currently no relevant standard that clearly gives the internal relationship between the cable insulation state and the development of partial discharge. And the measurement results are susceptible to environmental interference, resulting in the inability to accurately evaluate the insulation status of the cable
In addition, there is no effective diagnostic method for the radial damage of the insulation of the ethylene-propylene rubber cable in actual working conditions. Therefore, the research on the radial damage detection method of the ethylene-propylene rubber cable insulation is of great significance for maintaining the safe, stable and reliable operation of high-speed trains. great significance
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0051] The present invention will be further described below in conjunction with the accompanying drawings.
[0052] In the voltage range of 10-65kV, the number n of test voltage points is generally selected from 20 to 35, and in this embodiment, the number of test voltage points is selected as 26.
[0053] figure 1 It is a flow chart of the detection method adopted in the present invention, and the main steps are as follows:
[0054] Step 1: Take the qualified cables that have just left the factory, and select 26 test voltage points in turn within the voltage range of 10-65kV. The voltage value at the i-th test voltage point is recorded as V i , use a 0.1Hz ultra-low frequency VLF tester to measure the dielectric loss value at each test voltage point, and the dielectric loss value at the i-th test voltage point is recorded as 26 sets of data obtained from the measurement Denoted as the reference VLF voltage spectrum dielectric loss sequence F 1 (V i ), the voltage valu...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for detecting radial damage of a cable based on a VLF voltage spectrum, which comprises steps of obtaining a reference VLF voltage spectrum dielectric loss sequence and a VLF voltage spectrum dielectric loss sequence of a to-be-detected cable, calculating a correlation coefficient, determining whether the to-be-detected cable has radial damage according to the correlation coefficient, further determining the degree of radial damage of the to-be-detected cable, and the like. The invention has the beneficial effects that the method determines whether the cable has radial damage by measuring and calculating the correlation coefficient between the non-damaged cable and the VLF voltage spectrum dielectric loss sequence of the to-be-detected cable, the method issimple and reliable, and further the VLF voltage spectrum dielectric loss sequence is fitted and derived. By calculating the radial creep factor of the cable, the degree of radial damage of the cablecan be more accurately and comprehensively determined.
Description
technical field [0001] The invention belongs to the technical field of cable fault diagnosis, and in particular relates to a method for detecting radial damage of cables based on VLF voltage spectrum. Background technique [0002] Ethylene-propylene rubber cables have been widely used in high-speed trains due to their excellent properties such as heat resistance, low density, corrosion resistance, and flame retardancy. However, in actual operation, the pantograph takes electricity from the catenary, and the electricity is transmitted through the cable. To the network side cabinet, the cable inevitably needs to be bent and routed. Due to improper installation, long-lasting operation time, complex and changeable operating environment, and continuous increase in operating speed, radial damage to the cable insulation will eventually lead to Radial cracks occur in the cable insulation, which seriously reduces the stability of the traction power supply system. [0003] Very low f...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/083G01R31/088
Inventor 周利军陈远虎白龙雷车雨轩李丽妮余洋郭蕾王伟敏
Owner SOUTHWEST JIAOTONG UNIV