State Grid Tianjin Electric Power Company

Electric Power Science & Research Institute of State Grid Tianjin Electric Power Company

State Grid Corporation of China

Qinghua Tang

Chi Zhang

Chun He

Wei Fan

Zhengzheng Meng

Lin Li

Longji Li

Songyuan Li

Lei Yang

Shengchen Fang

Yang Yu

Haoming Wang

Pengxian Song

Jun Zhang

Xu Li

Ke Xu

Xiaohui Zhu

Fengzheng Zhou

Nan Wang

Xiaoguang Wang

Jin He

Qi Zhao

Minghui Duan

Rong Chen

Yue Han

Xiaobo Song

Yanwei Dong

Cheng Sun

Meng Cao

Mingzheng Zhu

Chunhui Zhang

Fei Lu

Weibo Li

Jin Li

Xuliang Zhu

Suya Li

The present disclosure provides a defect detection method and apparatus for a cushion layer of a cable, a device, and a storage medium. The method includes: obtaining specification parameters of a corrugated sheath of a to-be-detected cable, calculating a first volume of a cushion layer without deformation and a second volume of a deformed portion of the cushion layer when the cushion layer is deformed under stress, and calculating a stressed-state deformation ratio of the cushion layer based on the first volume and the second volume; obtaining a voltage, a current, an electrode area, an electrode distance, and an initial electrode distance of the cushion layer when the stressed-state deformation ratio is reached, and calculating volume resistivity of the cushion layer; and comparing the volume resistivity with a preset evaluation parameter to obtain a defect detection result of the cushion layer.

Defect detection method and apparatus for cushion layer of cable, device, and storage medium

Provided are an imaging method and system for residual stress of a basin insulator and a method for preparing a test block. The imaging method includes cutting and preparing a standard industrial sample of a basin insulator and testing the acoustoelastic coefficient of the standard industrial sample; then obtaining the residual stress data of the basin insulator and obtaining the spatial point sound velocity distribution of the basin insulator; finally, obtaining a stress distribution cloud map of the basin insulator by calculation of the attribute value and the coordinate data of a to-be-measured location, and performing reliability verification based on the residual stress data.

Imaging method and system for residual stress of basin insulator, and method for preparing test block

Defect detection method for a semi-conducting bedding layer of a power cable includes: obtaining a length parameter, a corrugation pitch parameter, radius parameters, and a thickness parameter of a power cable; obtaining a first resistance value between a shield and a corrugated sheath, and calculating a second resistance value of the shield based on the length parameter and the corrugation pitch parameter; calculating a radial resistance value of the semi-conducting bedding layer based on the first resistance value and the second resistance value; determining a contact angle of a critical point of contact between the corrugated sheath and the semi-conducting bedding layer based on the radius parameters and the thickness parameter; calculating volume resistivity of the semi-conducting bedding layer based on the radial resistance value and the contact angle; and comparing the volume resistivity with a preset evaluation parameter to obtain a defect detection result of the semi-conducting bedding layer.

Defect detection method, apparatus, and device for semi-conducting bedding layer of power cable

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Tianjin, China

Qinghua Tang