电力工程技术2024，Vol.43Issue(4)：177-185,9.DOI:10.12158/j.2096-3203.2024.04.018
基于改进TFDR法的核电站仪控电缆断裂缺陷检测
Fracture detection of I&C cable in NPP based on improved TFDR method
摘要
Abstract
Time-frequency domain reflection(TFDR)method has the advantages of maturity,convenience and high resolution,so it is widely applied to locate defects in various cables.To ensure the fracture defect of the instrumentation and control(I&C)cable can be effectively discriminated and precisely located in nuclear power plant(NPP),an improved TFDR method is proposed by intervening thermal stress in this paper.Subsequently,different degrees of fracture defects are simulated in a 50-meter multi-core I&C cable,and traditional TFDR and improved TFDR methods are used for detection and verification.Comparing the detection results of both,the peak localization of improved TFDR method for weak defect fracture is improved to 0.2,which is 2.5 times of the traditional TFDR method,and the localization error rate is less than 2.5％.Compared to the traditional TFDR method,improved TFDR method utilizes the thermal stress fluctuation variance curve as the basis for defect identification,the identification power of weak fracture defects can be substantially improved.The original localization distance can be corrected to improves the accuracy of weak fracture damage in improved TFDR method.So the effective identification and localization of weak defects can be further achieved in improved TFDR method.关键词
仪控电缆/缺陷定位/时频域反射(TFDR)法/时频互相关/热应力/浮动方差Key words
instrumentation and control cables/defect location/time-frequency domain reflection(TFDR)method/time-frequency cross-correlation/thermal stress/floating variance分类
信息技术与安全科学引用本文复制引用
邓红雷,李力行,涂画,姚力恺,张翔,刘刚..基于改进TFDR法的核电站仪控电缆断裂缺陷检测[J].电力工程技术,2024,43(4):177-185,9.基金项目
广东省自然科学基金资助项目(2022A15150125-23) （2022A15150125-23）
