A detection method for cable radial damage 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 lack of diagnostic methods for insulation radial damage, the inability to accurately evaluate the cable insulation state, and the measurement results are susceptible to environmental interference, etc.
Active Publication Date: 2019-06-04
SOUTHWEST JIAOTONG UNIV
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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
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[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 26.
[0053] figure 1 For the detection method flowchart that the present invention adopts, main steps are as follows:
[0054] Step 1: Take the qualified cables that have just left the factory, and select 26 test voltage points on average in the voltage range of 10 ~ 65kV, and record the voltage value at the i-th test voltage point as V i , using a 0.1Hz ultra-low frequency VLF tester to measure the dielectric loss value at each test voltage point, the dielectric loss value at the i-th test voltage point is recorded as The 26 sets of data obtained from the measurement Recorded as the reference VLF voltage spectrum dielectric loss sequence F 1 (V i ), the voltage value at the test voltage po...
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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 detection method for cable radial damage based on VLF voltage spectrum. Background technique [0002] Ethylene-propylene rubber cables are 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 power from the catenary, and the power is transmitted through the cable To the network side cabinet, the cables inevitably need to be bent and routed. Due to improper installation, coupled with long-term operation, complex and changeable operating environment, and continuous increase in operating speed, radial damage to the cable insulation occurs, which eventually leads to Radial cracks occur in the cable insulation layer, which seriously reduces the stability of the traction power supply system. [0003] The very low...
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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