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

State Grid Tianjin Electric Power Company

State Grid Corporation of China

North China Electric Power University

Wei Fan

Chi Zhang

Longji Li

Chun He

Qinghua Tang

Lei Yang

Xiaoguang Wang

Shengchen Fang

Yang Yu

Haoming Wang

Pengxian Song

Yi Ding

Xudong Wang

Jun Zhang

Guodong Li

Yan Qi

Xu Li

Zhengzheng Meng

Li Zhang

Ke Xu

Lin Li

Xuejun Shang

Songyuan Li

Fengzheng Zhou

Xiaohui Zhu

Tao Li

Jin He

Kun Wang

Guohao Li

Pan Zhang

Nan Wang

Ning Jiang

Zhijun Zhang

Minghui Duan

Jie Zhang

Jian Wang

Rong Chen

Zhiyong Gan

Bin Qu

Qingfeng Wen

Yanxin Shi

Yongfu Wang

Ziyue Wang

Yuyan Man

Xiaoguang Xi

Cheng Sun

Ning Kang

Mingzheng Zhu

Chunhui Zhang

Fei Lu

Weibo Li

Xuliang Zhu

Menghan Wu

Liansheng Zhou

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

A GIS mechanical fault diagnosis method and the device are disclosed. The method includes: collecting vibration signals to be measured of various excitation sources of GIS in mechanical operation; performing wavelet packet-feature entropy vector extraction on the vibration signals to be measured, when it is determined that the vibration signals to be measured are abnormal according to standard vibration signals in the normal state; inputting the extracted wavelet packet-feature entropy vectors into the pre-trained BP neural network for GIS mechanical fault identification, and outputting the corresponding fault. The disclosure integrates the vibration signals under the action of various excitation sources, extracts the feature entropy vectors according to the entropy theory, and constructs and trains a BP neural network that can classify and recognize various GIS mechanical faults, so as to perform comprehensive and effective GIS mechanical faults diagnose.

GIS mechanical fault diagnosis method and device

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

The present application relates to a method for evaluating an operation of a distribution network based on data capture and Spark. The method includes: acquiring a packet from a terminal, and mirroring the packet through a mirroring port of a switch to acquire a mirror packet of the packet; analyzing the mirror packet, acquiring a 101/104 protocol packet, and storing the 101/104 protocol packet into an HDFS; acquiring the 101/104 protocol packet from the HDFS, parsing the 101/104 protocol packet on a Spark platform to acquire a parameter in the 101/104 protocol packet, and analyzing and processing the parameter to obtain a key indicator for evaluating the operation of the distribution network; and displaying the key indicator through a web page.

Method and system for evaluating an operation of a distribution network

Provided is a method for determining types of ice-and-snow cover. The method includes: determining typical RGB component values of typical types of ice-and-snow cover, establishing a one-to-one corresponding relation between the typical types of ice-and-snow cover and the typical RGB component values, and establishing a database of typical types of ice-and-snow cover; and extracting RGB values of an ice-and-snow covering point from an ice-and-snow cover image of a measurement area, comparing RGB component values of the ice-and-snow covering point with typical RGB component values in the database of typical types of ice-and-snow cover, and determining the type of ice-and-snow cover of the measurement area according to a comparison result.

Method and device for determining types of ice-and-snow cover

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Tianjin, China

Wei Fan