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Xiao Z.,Wuhan KangPuChangQing Software Technology Co. | Hongjun Y.,State Grid Corporation of China | Zhaofeng W.,State Grid Corporation of China | Muping S.,Zhejiang University | And 3 more authors.
Optics InfoBase Conference Papers | Year: 2016

A system of distributed current sensing based on Polarization Optical Time Domain Reflectometer (POTDR) is proposed to achieve the quantitative detection of current. Experimental results show that the system has high sensitivity. © OSA 2016.


Cai W.,State Grid Electric Power Research Institute of China | Cai W.,Wuhan University | Zhou G.-H.,Shanxi Electrical Power Corporation | Yang H.-J.,Xiangfan Guowang Composite Insulator Co. | And 3 more authors.
Gaodianya Jishu/High Voltage Engineering | Year: 2010

Online monitoring methods and the fault types for running composite insulators were analyzed. To master online status of composite insulators and offset scarcity of existing monitoring methods, both stress and temperature were proposed as two key parameters of online monitoring the operating conditions of the composite insulators. The technical means which the optic fiber sensors were used to measure stress and temperature of the composite insulator mandrel were presented. After collaborative research and development, the composite insulators with optic fiber sensors embedded in the mandrel inclusion were produced, meanwhile, the 220 kV transmission lines linking network was tested. The technical feasibilities are fully confirmed by the experimental results, while the prospects and requirements of the next phase are also proposed, in order to optimize the technology platform.


Cai W.,Wuhan University | Cai W.,State Grid Electric Power Research Institute of China | Wen S.,Jiangsu Nanjing Power Supply Company | Deng H.-M.,Wuhan University | And 2 more authors.
Gaodianya Jishu/High Voltage Engineering | Year: 2011

To understand the tension change of fiber Bragg grating (FBG) in a composite rod, thermal and stress strain of the implanted FBG is analyzed. The relationship between the center wavelength and reflectance spectrum of FBG and the structure and material parameters of insulator rod is obtained under the combined action of the insulator structural strain and thermal strain caused by the change of temperature, similarly, the relationship between the strain sensitivity of FBG and the structure parameters of insulator rod is obtained. The temperature sensitivity coefficient of FBG is calculated according to the thermal strain in end-fitting, and the numerical simulation on the change of temperature in the parts of the insulator is used to analyze the change of the reflectance spectrum of FBG. The results can provide a basis for the application of the composite insulator with implanted FBG.


Cai W.,Wuhan University | Cai W.,State Grid Electric Power Research Institute of China | Luo B.,China Southern Power Grid Co. | Deng H.-M.,State Grid Electric Power Research Institute of China | And 2 more authors.
Gaodianya Jishu/High Voltage Engineering | Year: 2011

In order to take precautions against the accident of composite insulators, such as brittle fracture of FRP rods, the flashover of iced insulators and so on, the intelligence rod structure is adopted by implanting fiber Bragg grating (FBG) into the composite insulator rod, which can online detect the tension change of the composite insulator interior. But the structure of the composite insulator end-fitting and the stress distribution is so complex that the self-strain of FBG is not directly suitable to indicate the tension change of the composite insulator interior. On the assumption that FBG has the same axial strain as the composite insulator rod, the finite element method is used to analyze the stress distribution of the composite insulator end-fitting for detecting the tension change of the composite insulator interior, and the relationship between the tension change and the displacement in the center wavelength of FBG is obtained, which can provide the basis for the application of the composite insulator embedded with FBG.


Cai W.,State Grid Electric Power Research Institute of China | Deng H.,State Grid Electric Power Research Institute of China | Zhou G.,Shanxi Electrical Power Corporation | Wang J.,Shanxi Electrical Power Corporation | Yang F.,Wuhan Kangpu Changqing Software Technology Co.
IEEE Transactions on Dielectrics and Electrical Insulation | Year: 2013

In this paper, the optical technology is used to monitor ESDD near insulators on transmission line. This technique is based on the light energy loss and the distribution of optical field in the dielectric waveguide. Under the same measure environment, there has the certain correlation between the ESDDs of the polluted insulators and the ones of the quartz glass rod. Based on the experimental results, artificial neural networks (ANN) has been developed to model the relationships between ESDD by the optical technology and the measured ones. The contrasts reveal that the ANN-calculated ESDDs have the same corresponding with the measured ones for a practical system. © 1994-2012 IEEE.


Wen S.,Jiangsu Nanjing Power Supply Company | Cai W.,State Grid Electric Power Research Institute of China | Deng H.,State Grid Electric Power Research Institute of China | Du S.,Jiangsu Electric Power Company | And 2 more authors.
Gaodianya Jishu/High Voltage Engineering | Year: 2013

Applying fiber Bragg grating (FBG) to monitor composite insulators status online has become an effective monitor technique. In order to obtain the relationship between the stress change of the insulator and the center wavelength of FBG in composite rods, we simulated fault conditions such as the rod breakdown, umbrella skirt damage, and different electrical fitting conditions etc., and analyzed the relationship among the stress of the implanted FBG, the damage proportion and the center wavelength. The results show that the wavelength of FBG increases with the broken area of the rod, and the change has the maximum value near the point of failure; the wavelength of FBG has a significant increasing trend with the running time of the insulator, and the drift value of umbrella skirt damage is higher than that of non-damage condition; the temperature sensitivity coefficient of FBG in the end fitting markedly increases with the lateral pressure value, and the heat stress of end fitting has a certain extending effect on the coefficient. These data can provide evaluation references for running composite insulators.


Du S.,Jiangsu Electric Power Company | Cai W.,State Grid Electric Power Research Institute of China | Deng H.,State Grid Electric Power Research Institute of China | Wen S.,Jiangsu Nanjing Power Supply Company | And 2 more authors.
Gaodianya Jishu/High Voltage Engineering | Year: 2012

According to the present situation of inspection of the insulators in transmission lines, based on reviewing the related inspection at home and abroad, and combined with optical fiber sensing technology and composite insulator technology, the intelligence rod structure of the composite insulator was developed by embedding fiber Bragg grating (FBG) into the composite insulator rod. The internal temperature and stress collection system of the composite insulator was designed to realize real-time monitoring of the running composite insulators. The calibration test of the composite insulator was performed to determine the quantitative relationship between the center wavelength of the FBG and the temperature/stress of the composite insulator. The results show that the temperature and stress of the composite insulator have a good linear relationship with the center wavelength of the FBG. The tension coefficient of FBG in the insulator is 47~50 pm/kN, and the temperature coefficient is 13.5~14.1 pm/°C, which provides inspection reference for the running composite insulator embedded with FBG.


Gong Q.,Wuhan University | Feng R.,Wuhan University | Li W.,Wuhan University | Zhang W.,Wuhan Kangpu Changqing Software Technology Co. | Xu G.,Wuhan University
Gaodianya Jishu/High Voltage Engineering | Year: 2016

In order to solve the problem that overhead transmission lines are often struck by lightning and the lightning point can not be located accurately, we propose a novel location method for lightning striking the optical fiber composite overhead ground wire (OPGW) based on the state of polarization of light. The method uses the internal optical fibers of OPGW as sensors,and by sending stable probe light to the optical fibers through the monitoring host computer at the substation, the changes involved in the state of the polarization of light is detected to determine the lightning point. By simulation lightning tests on OPGW under laboratory environment, we analyze the abrupt information in the state of polarization caused by the Faraday effect. Then we utilize singular value decomposition (SVD) and wavelet analysis algorithms to locate the fault point after extracting the arriving time which stands for the abrupt information in the state of polarization spreading from the lightning strike point to the polarization demodulation equipment. The laboratory test results show that the proposed method can control the location error within 1%, which is insensitive to the factors such as line parameters and the velocity of traveling wave that counts in the traditional methods. The fault point can be determined on the condition that the internal optical fibers of OPGW are in good state. It has provided new ideas for the detection and location of lightning strike point on the transmission lines with good accuracy and reliability. © 2016, High Voltage Engineering Editorial Department of CEPRI. All right reserved.


Yu Z.,Guangxi Electric Power Research Institute | Xu J.,Wuhan Kangpu Changqing Software Technology Co.
Gaoya Dianqi/High Voltage Apparatus | Year: 2014

The paper proposed to apply the TDLAS technology in detecting the volume fraction of H2S in the atmosphere of SF6. Through the research and analysis of TDLAS technology, a simple detection prototype was manufactured, the practicalapplicability of the prototype was approved through certain test. The research result indicated that the detection of the volume fraction of H2S gas in SF6 can achieve high accuracy by using this technology at atmospherepressure.

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