Cable aging defect lossless positioning method based on transmission line model

• Main Authors: QIAN YUCHENG, ZHAO CHANGWEI, WANG SHUDONG, YANG XIAOZHI, LI QING, CAO ZHANGPENG, YANG WEI, NIU LEI, LI SENLIN, HU YAN, GUAN SHAOQING
• Format: Patent
• Language: Chinese; English
• Published: 01.03.2024
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention relates to the technical field of cable defect detection, and discloses a cable aging defect lossless positioning method based on a transmission line model, and the method comprises the steps: carrying out the measurement through professional equipment, and obtaining the impedance spectrum data of the head end of a cable; establishing a cable head end impedance spectrum model containing a defect section; constructing a along-line characteristic diagnosis function; describing a positioning waveform through the function relationship; filtering and de-noising the positioning waveform; and local defect judgment and positioning are performed in combination with the analysis graph. According to the method, the actual state of the cable during operation can be better detected under the condition that the cable is not damaged, whether early-stage defects and aging exist in the cable or not is detected, and defect, aging and fault positioning can be achieved. Compared with a current detection method, the