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Flash sintering of zinc oxide (ZnO) ceramics can be induced at room temperature (25 °C) by electrical breakdown at high electric field strength. However, a strong discharge may degrade the sample. This study investigated the effects of atmospheric pressure and composition on the onset electric field for the flash sintering of ZnO. The experimental results show that flash sintering of ZnO under a low electric field at room temperature can be achieved by adjusting the atmospheric conditions. Compared with the onset electric field strength under normal atmospheric conditions, the value for flash sintering of ZnO at 20 kPa in a mixture of 20% air +80% argon (Ar) can be reduced by 82% to approximately 700 V/cm. This method also applies to yttrium oxide (Y2O3) for a low electric field in flash sintering at room temperature, and is the first report on flash sintering of Y2O3 at room temperature.
Hongyang Zhou; Xiang Li; Rongxia Huang; Nianping Yan; Xilin Wang; Zhidong Jia. Effect of atmospheric conditions on the onset electric field of ZnO and Y2O3 ceramics flash sintering at room temperature. Ceramics International 2021, 1 .
AMA StyleHongyang Zhou, Xiang Li, Rongxia Huang, Nianping Yan, Xilin Wang, Zhidong Jia. Effect of atmospheric conditions on the onset electric field of ZnO and Y2O3 ceramics flash sintering at room temperature. Ceramics International. 2021; ():1.
Chicago/Turabian StyleHongyang Zhou; Xiang Li; Rongxia Huang; Nianping Yan; Xilin Wang; Zhidong Jia. 2021. "Effect of atmospheric conditions on the onset electric field of ZnO and Y2O3 ceramics flash sintering at room temperature." Ceramics International , no. : 1.
Algae contamination accumulated on the surface of insulators will affect the electrical properties of insulators. At present, the characterization method of algae contamination is the image method, which determines the distribution of algae contamination through colour. The detection results are affected by environmental changes and the growth state of algae. This paper puts forward a method of detecting polluted insulator surface with algae by using laser‐induced breakdown spectroscopy (LIBS) technique, combined with the scanning electron microscope (SEM), inductively coupled plasma emission spectrometer (ICP), analyzed by the spectra of algae contamination. Mg, Ca, Fe are selected as the analytical element. The classification of algae contamination, non‐algae contamination and no contamination are realized with the principal component analysis (PCA). The research results are of great significance for characterization of algal pollution on insulator surface by LIBS.
Fuzeng Zhang; Shaojie Chen; Tingting Wang; Yongsheng Xu; Xinran Qin; Xilin Wang; Zhidong Jia. LIBS characterization of algal fouling on insulators. The Journal of Engineering 2021, 1 .
AMA StyleFuzeng Zhang, Shaojie Chen, Tingting Wang, Yongsheng Xu, Xinran Qin, Xilin Wang, Zhidong Jia. LIBS characterization of algal fouling on insulators. The Journal of Engineering. 2021; ():1.
Chicago/Turabian StyleFuzeng Zhang; Shaojie Chen; Tingting Wang; Yongsheng Xu; Xinran Qin; Xilin Wang; Zhidong Jia. 2021. "LIBS characterization of algal fouling on insulators." The Journal of Engineering , no. : 1.
Flashovers seriously affect the safe operation of high-voltage transmission lines. The influence of different pollutants on the flashover of insulators differs greatly. For hygroscopic aluminum phosphate, glucose, and other contaminants, the saturated moisture and flashover characteristics can cause flashovers at low humidity. Therefore, it is of great significance to quickly detect the moisture content in the field. In this article, based on the laser-induced breakdown spectroscopy (LIBS) method, the spectral characteristics of aluminum phosphate contamination were studied, and the spectral lines that characterize the content of aluminum phosphate were obtained. The detection limit for phosphorus was calculated according to the calibration curve. The difference in the moisture content of aluminum phosphate contamination also affects the LIBS signal. The atomic spectrum of phosphorus is selected as the analytical spectral lines. Within a certain relative humidity range, spectral data normalization reduces the influence of the moisture content on the mass fraction of aluminum phosphate samples detected by LIBS. The research results are of great significance for the rapid detection of special contamination, such as aluminum phosphate, in actual lines.
Xinran Qin; Fuzeng Zhang; Shaojie Chen; Tingting Wang; Xiao Hong; Xilin Wang; Zhidong Jia. Characterization of Hygroscopic Insulator Contamination via Laser-Induced Breakdown Spectroscopy. IEEE Transactions on Plasma Science 2021, PP, 1 -7.
AMA StyleXinran Qin, Fuzeng Zhang, Shaojie Chen, Tingting Wang, Xiao Hong, Xilin Wang, Zhidong Jia. Characterization of Hygroscopic Insulator Contamination via Laser-Induced Breakdown Spectroscopy. IEEE Transactions on Plasma Science. 2021; PP (99):1-7.
Chicago/Turabian StyleXinran Qin; Fuzeng Zhang; Shaojie Chen; Tingting Wang; Xiao Hong; Xilin Wang; Zhidong Jia. 2021. "Characterization of Hygroscopic Insulator Contamination via Laser-Induced Breakdown Spectroscopy." IEEE Transactions on Plasma Science PP, no. 99: 1-7.
Dual-comb spectroscopy has been an infusive spectroscopic tool for gas detection due to its high resolution, high sensitivity, and fast acquisition speed over a broad spectral range without any mechanical scanning components. However, the complexity and cost of high-performance dual-comb spectroscopy are still high for field-deployed applications. To solve this problem, we propose a simple frequency domain post-processing method by extracting the accurate position of a specific absorption line frame by frame. After aligning real-time spectra and averaging for one second, the absorbance spectrum of H13C14N gas in the near-infrared is obtained over 1.1 THz spectral range. By using this method, the standard deviation of residual error is only ~0.002, showing great agreement with the conventional correction method. In addition, the spectral resolution is improved from 13.4 GHz to 4.3 GHz compared to direct spectrum averaging. Our method does not require a specially designed common-mode suppression comb, rigorous frequency control system, or complicated computational algorithm, providing a cost-effective scheme for field-deployed Doppler-limited spectroscopy applications.
Haoyang Yu; Qian Zhou; Xinghui Li; Xiaohao Wang; Xilin Wang; Kai Ni. Improving Resolution of Dual-Comb Gas Detection Using Periodic Spectrum Alignment Method. Sensors 2021, 21, 903 .
AMA StyleHaoyang Yu, Qian Zhou, Xinghui Li, Xiaohao Wang, Xilin Wang, Kai Ni. Improving Resolution of Dual-Comb Gas Detection Using Periodic Spectrum Alignment Method. Sensors. 2021; 21 (3):903.
Chicago/Turabian StyleHaoyang Yu; Qian Zhou; Xinghui Li; Xiaohao Wang; Xilin Wang; Kai Ni. 2021. "Improving Resolution of Dual-Comb Gas Detection Using Periodic Spectrum Alignment Method." Sensors 21, no. 3: 903.
The electric field grading by dielectric permittivity gradient devices is an effective way of enhancing the insulation performance. In situ electric-field-driven assembly is an advanced method for the fabrication of insulating devices with adaptive permittivity gradients; however, there is no theoretical guidance for its use in design. We develop an analytical model for the spatiotemporal permittivity of uncured-composite device in an AC electric field and investigate the coupling effects between the in situ assisted electric field and rod-like filler self-assembly in three devices: pin-flat insulator, basin insulator, and silicone-gel-insulated gate bipolar transistor. Our model is based on optical images and dielectric permittivity monitoring, thus avoiding complicated electrodynamic calculations. The electric-field uniformity follows a U-shaped curve with assisted-voltage application time. We also find a combination of experimental parameters that constitutes an optimal tradeoff between internal and surface electric-field uniformities. This work establishes a theoretical design framework to optimize the performance (e.g., flashover voltage and breakdown strength) of composite device.
Zikui Shen; Xilin Wang; Zhenyu Xin; Tianfeng Zhang; Chi Xu; Zhidong Jia. Analytical model for the spatiotemporal permittivity of uncured-composite devices in an AC electric field. Journal of Physics D: Applied Physics 2021, 54, 155302 .
AMA StyleZikui Shen, Xilin Wang, Zhenyu Xin, Tianfeng Zhang, Chi Xu, Zhidong Jia. Analytical model for the spatiotemporal permittivity of uncured-composite devices in an AC electric field. Journal of Physics D: Applied Physics. 2021; 54 (15):155302.
Chicago/Turabian StyleZikui Shen; Xilin Wang; Zhenyu Xin; Tianfeng Zhang; Chi Xu; Zhidong Jia. 2021. "Analytical model for the spatiotemporal permittivity of uncured-composite devices in an AC electric field." Journal of Physics D: Applied Physics 54, no. 15: 155302.
The electric field grading of dielectric permittivity gradient devices is an effective way of enhancing their insulation properties. The in situ electric field‐driven assembly is an advanced method for the fabrication of insulation devices with adaptive permittivity gradients; however, there is no theoretical guidance for design. In this study, an analytical model with a time constant is developed to determine the transient permittivity of uncured composites under an applied AC electric field. This model is based on optical image and dielectric permittivity monitoring, which avoids the direct processing of complex electrodynamics. For a composite with given components, the increased filler content and electric field strength can accelerate the transient process. Compared with the finite element method based on differential equations, this statistical model is simple but efficient, and can be applied to any low‐viscosity uncured composites, which may contain multiple fillers. More importantly, when a voltage is applied to an uncured composite insulating device, the proposed model can be used to analyse the spatiotemporal permittivity characteristics of this device and optimise its permittivity gradient for electric field grading.
Zikui Shen; Zhenyu Xin; Xilin Wang; Xinyu Wei; Zhidong Jia. Analytical model for the transient permittivity of uncured TiO 2 whisker/liquid silicone rubber composites under an AC electric field. High Voltage 2020, 6, 470 -479.
AMA StyleZikui Shen, Zhenyu Xin, Xilin Wang, Xinyu Wei, Zhidong Jia. Analytical model for the transient permittivity of uncured TiO 2 whisker/liquid silicone rubber composites under an AC electric field. High Voltage. 2020; 6 (3):470-479.
Chicago/Turabian StyleZikui Shen; Zhenyu Xin; Xilin Wang; Xinyu Wei; Zhidong Jia. 2020. "Analytical model for the transient permittivity of uncured TiO 2 whisker/liquid silicone rubber composites under an AC electric field." High Voltage 6, no. 3: 470-479.
‘Thermal runaway’ was the most popular mechanism in flash sintering, but this theory was inappropriate under high electric field. In this paper, we described electric discharge and breakdown phenomena in experiment to verify this point. And water moisture was found an important role in conducting electric discharge, that increasing moisture content of samples decreased the onset electric field of flash sintering and as low as 1628 V/cm of onset electric field was realized in this paper. With high electric field that can induce electric discharge in the sample, the flash sintering can be induced at room temperature and atmosphere.
Jieming Liu; Huang Rongxia; Ruobing Zhang; Guanghua Liu; Xilin Wang; Zhidong Jia; Liming Wang. Mechanism of flash sintering with high electric field: In the view of electric discharge and breakdown. Scripta Materialia 2020, 187, 93 -96.
AMA StyleJieming Liu, Huang Rongxia, Ruobing Zhang, Guanghua Liu, Xilin Wang, Zhidong Jia, Liming Wang. Mechanism of flash sintering with high electric field: In the view of electric discharge and breakdown. Scripta Materialia. 2020; 187 ():93-96.
Chicago/Turabian StyleJieming Liu; Huang Rongxia; Ruobing Zhang; Guanghua Liu; Xilin Wang; Zhidong Jia; Liming Wang. 2020. "Mechanism of flash sintering with high electric field: In the view of electric discharge and breakdown." Scripta Materialia 187, no. : 93-96.
Flash sintering is a fabulous method to sinter ceramics in several seconds at low furnace temperatures.For the first report, with an optimized design of electrodes by introducing extra tips, dry zinc oxide specimens were sintered at room temperature under an Alternating Current (AC) field of 1,765 V/cm without any aids. The sintering processes could be induced by surface flashover, which was a new mechanism and verified by the experimental results. The method lowers the onset electric field and currents, to prevent the physical fracture of specimens caused by a large power surge when flash events occur.
Xiang Li; Rongxia Huang; Xilin Wang; Guanghua Liu; Zhidong Jia; Liming Wang. A simple optimized design of an electrode to conduct flash sintering at room temperature and low onset electric field. Scripta Materialia 2020, 186, 158 -162.
AMA StyleXiang Li, Rongxia Huang, Xilin Wang, Guanghua Liu, Zhidong Jia, Liming Wang. A simple optimized design of an electrode to conduct flash sintering at room temperature and low onset electric field. Scripta Materialia. 2020; 186 ():158-162.
Chicago/Turabian StyleXiang Li; Rongxia Huang; Xilin Wang; Guanghua Liu; Zhidong Jia; Liming Wang. 2020. "A simple optimized design of an electrode to conduct flash sintering at room temperature and low onset electric field." Scripta Materialia 186, no. : 158-162.
The composition of contamination deposited on transmission line insulators can affect their surface flashover voltage. Currently, there is no rapid on-line method to detect this contamination composition in power grids. In this paper, we applied laser-induced breakdown spectroscopy (LIBS) to analyze contamination on insulator surfaces. Usually, Na and Ca salts are found in contamination along with various sulfate, carbonate, and chloride compounds. As an element’s detection method, LIBS can only measure a certain element content, for example, Ca. The mixture of various compounds with the same cations can influence the LIBS signal. The influence of mixing ratios on the calibration curves and relative spectral intensity was studied via LIBS. Na2CO3, NaHCO3, CaSO4, and CaCO3 samples containing different proportions of Na and Ca were prepared. The linear correlation coefficients (R2) for the Na and Ca calibration curves generated using various mixing ratios were analyzed. The results showed that the mixture ratio did not dramatically affect the linear calibration curves for mixtures containing the same cations. This finding may significantly reduce the difficulty of applying LIBS analysis for complex contamination on insulators. The laser energy density had effects on the spectral characteristics of the measured elements. The partial least-square regression (PLSR) model can improve the accuracy of Na and Ca prediction.
Shan Lu; Xinwei Wang; Tianzheng Wang; Xinran Qin; Xilin Wang; Zhidong Jia. Analysis of Salt Mixture Contamination on Insulators via Laser-Induced Breakdown Spectroscopy. Applied Sciences 2020, 10, 2617 .
AMA StyleShan Lu, Xinwei Wang, Tianzheng Wang, Xinran Qin, Xilin Wang, Zhidong Jia. Analysis of Salt Mixture Contamination on Insulators via Laser-Induced Breakdown Spectroscopy. Applied Sciences. 2020; 10 (7):2617.
Chicago/Turabian StyleShan Lu; Xinwei Wang; Tianzheng Wang; Xinran Qin; Xilin Wang; Zhidong Jia. 2020. "Analysis of Salt Mixture Contamination on Insulators via Laser-Induced Breakdown Spectroscopy." Applied Sciences 10, no. 7: 2617.
Surface pollution deposition in a high voltage surface can reduce the surface flashover voltage, which is considered to be a serious accident in the transmission of electric power for the high conductivity of pollution in wet weather, such as rain or fog. Accordingly, a rapid and accurate online pollution detection method is of great importance for monitoring the safe status of transmission lines. Usually, to detect the equivalent salt deposit density (ESDD) and non-soluble deposit density (NSDD), the pollution should be collected when power cut off and bring back to lab, time-consuming, low accuracy and unable to meet the online detection. Laser-induced breakdown spectroscopy (LIBS) shows the highest potential for achieving online pollution detection, but its application in high voltage electrical engineering has only just begun to be examined. In this study, a LIBS method for quantitatively detecting the compositions of pollutions on the insulators was investigated, and the spectral characteristics of a natural pollution sample were examined. The energy spectra and LIBS analysis results were compared. LIBS was shown to detect pollution elements that were not detected by conventional energy spectroscopy and had an improved capacity to determine pollution composition. Furthermore, the effects of parameters, such as laser energy intensity and delay time, were investigated for artificial pollutions. Increasing the laser energy intensity and selecting a suitable delay time could enhance the precision and relative spectral intensities of the elements. Additionally, reducing the particle size and increasing the density achieved the same results.
Xinwei Wang; Shan Lu; Tianzheng Wang; Xinran Qin; Xilin Wang; Zhidong Jia. Analysis of Pollution in High Voltage Insulators via Laser-Induced Breakdown Spectroscopy. Molecules 2020, 25, 822 .
AMA StyleXinwei Wang, Shan Lu, Tianzheng Wang, Xinran Qin, Xilin Wang, Zhidong Jia. Analysis of Pollution in High Voltage Insulators via Laser-Induced Breakdown Spectroscopy. Molecules. 2020; 25 (4):822.
Chicago/Turabian StyleXinwei Wang; Shan Lu; Tianzheng Wang; Xinran Qin; Xilin Wang; Zhidong Jia. 2020. "Analysis of Pollution in High Voltage Insulators via Laser-Induced Breakdown Spectroscopy." Molecules 25, no. 4: 822.
The required onset flash sintering temperature of a ZnO ceramic was decreased to as low as room temperature under an applied Alternating Current (AC) field of 3530 V/cm, and the ZnO ceramic achieved 99% of its theoretical density in 40 s without sintering aids. Due to electrical breakdown, flash sintering occurred once the AC field increased to 5 kV even with no increase in sample temperature and conductivity. Electrical breakdown happened at both edges of the sample, a phenomenon observed in thermal infrared images and confirmed by the simulation results. Electrical breakdown can be very useful in flash sintering even at room temperature.
Jieming Liu; Xiang Li; Xilin Wang; Rongxia Huang; Zhidong Jia. Alternating current field flash sintering 99% relative density ZnO ceramics at room temperature. Scripta Materialia 2019, 176, 28 -31.
AMA StyleJieming Liu, Xiang Li, Xilin Wang, Rongxia Huang, Zhidong Jia. Alternating current field flash sintering 99% relative density ZnO ceramics at room temperature. Scripta Materialia. 2019; 176 ():28-31.
Chicago/Turabian StyleJieming Liu; Xiang Li; Xilin Wang; Rongxia Huang; Zhidong Jia. 2019. "Alternating current field flash sintering 99% relative density ZnO ceramics at room temperature." Scripta Materialia 176, no. : 28-31.
We examined the flash sintering behavior of zinc oxide nanopowder at an onset furnace temperature as low as 50 °C without sintering aids under an AC electric field up to 2800 V/cm. As the electric field applied in the specimens increased and the flash sintering occurred in air, the onset furnace temperature decreased from 190 to 126 °C, while with the thermal insulation method, the onset furnace temperature decreased to 50 °C. The surface temperature of the specimens was observed with a thermal infrared camera, and the peak temperature was 1404 °C. A high density >92% was achieved with thermal insulation flash sintering and an electric field of 2800 V/cm.
Xilin Wang; Yuchen Zhu; Rongxia Huang; Hongwei Mei; Zhidong Jia. Flash sintering of ZnO ceramics at 50 °C under an AC field. Ceramics International 2019, 45, 24909 -24913.
AMA StyleXilin Wang, Yuchen Zhu, Rongxia Huang, Hongwei Mei, Zhidong Jia. Flash sintering of ZnO ceramics at 50 °C under an AC field. Ceramics International. 2019; 45 (18):24909-24913.
Chicago/Turabian StyleXilin Wang; Yuchen Zhu; Rongxia Huang; Hongwei Mei; Zhidong Jia. 2019. "Flash sintering of ZnO ceramics at 50 °C under an AC field." Ceramics International 45, no. 18: 24909-24913.
Metal cabinets such as switch cabinets and ring network cabinets have the advantages of small footprints and good protection for equipment and offer neat and orderly protection. They are widely used in power systems. In a hot and humid environment, condensation can easily cause equipment to age and even cause insulation failure. Therefore, research on reliable anticondensation methods is of great significance for the safe operation of power equipment. In this study, phase change capsules with phase transition temperatures of 22 and 32 °C were used as fillers and liquid silicone rubber was used as a matrix to prepare liquid silicone rubber composites filled with phase change capsules for a temperature-control coating. Studies have shown that liquid silicone rubber coatings containing phase change capsules can significantly enhance the anticondensation performance of metal cabinets. By using a temperature-control coating on the surface where the cabinet experiences condensation, the temperature difference between the surface and the dew point is reduced, thereby slowing down the condensation rate and even preventing condensation.
Juyi Guo; Xilin Wang; Jun Wang; Chuan Chen; Yu Liu; Weinan Fan; Zhidong Jia. Study on the Anticondensation Characteristics of Liquid Silicone Rubber Temperature-Control Coatings. Polymers 2019, 11, 1282 .
AMA StyleJuyi Guo, Xilin Wang, Jun Wang, Chuan Chen, Yu Liu, Weinan Fan, Zhidong Jia. Study on the Anticondensation Characteristics of Liquid Silicone Rubber Temperature-Control Coatings. Polymers. 2019; 11 (8):1282.
Chicago/Turabian StyleJuyi Guo; Xilin Wang; Jun Wang; Chuan Chen; Yu Liu; Weinan Fan; Zhidong Jia. 2019. "Study on the Anticondensation Characteristics of Liquid Silicone Rubber Temperature-Control Coatings." Polymers 11, no. 8: 1282.
Silicone rubber material is widely used in high-voltage external insulation systems due to its excellent hydrophobicity and hydrophobicity transfer performance. However, silicone rubber is a polymeric material with a poor ability to resist electrical tracking and erosion; therefore, some fillers must be added to the material for performance enhancement. The inclined plane test is a standard method used for evaluating the tracking and erosion resistance by subjecting the materials to a combination of voltage stress and contaminate droplets to produce failure. This test is time-consuming and difficult to apply in field inspection. In this paper, a new and faster way to evaluate the tracking and erosion resistance performance is proposed using laser-induced breakdown spectroscopy (LIBS). The influence of filler content on the tracking and erosion resistance performance was studied, and the filler content was characterized by thermogravimetric analysis and the LIBS technique. In this paper, the tracking and erosion resistance of silicone rubber samples was correctly classified using principal component analysis (PCA) and neural network algorithms based on LIBS spectra. The conclusions of this work are of great significance to the performance characterization of silicone rubber composite materials.
Ping Chen; Xilin Wang; Xun Li; Qishen Lyu; Naixiao Wang; Zhidong Jia. A Quick Classifying Method for Tracking and Erosion Resistance of HTV Silicone Rubber Material via Laser-Induced Breakdown Spectroscopy. Sensors 2019, 19, 1087 .
AMA StylePing Chen, Xilin Wang, Xun Li, Qishen Lyu, Naixiao Wang, Zhidong Jia. A Quick Classifying Method for Tracking and Erosion Resistance of HTV Silicone Rubber Material via Laser-Induced Breakdown Spectroscopy. Sensors. 2019; 19 (5):1087.
Chicago/Turabian StylePing Chen; Xilin Wang; Xun Li; Qishen Lyu; Naixiao Wang; Zhidong Jia. 2019. "A Quick Classifying Method for Tracking and Erosion Resistance of HTV Silicone Rubber Material via Laser-Induced Breakdown Spectroscopy." Sensors 19, no. 5: 1087.
Detection of corona discharge of the transmission line can reflect its health status and provide warning information for maintenance. Some existing detection methods are flawed and cannot be used widely. This study presents a new method by measuring the electromagnetic wave caused by corona discharge with RF antenna. Then a circularly polarised log-periodic antenna was designed by making two pairs of log-periodic antennas 90° orthogonal. Finally, this antenna was simulated and manufactured to detect electromagnetic signals, the result shows that the time domain signal of corona discharge is a high frequency oscillation wave and its fast Fourier transform main distributes between 200 and 350 MHz.
Yunfeng Xia; Xinming Song; Zhidong Jia; Xilin Wang; Jinfeng Qi; Zheng Xu. Research on antenna for detecting the corona discharge of transmission line. The Journal of Engineering 2019, 2019, 2965 -2968.
AMA StyleYunfeng Xia, Xinming Song, Zhidong Jia, Xilin Wang, Jinfeng Qi, Zheng Xu. Research on antenna for detecting the corona discharge of transmission line. The Journal of Engineering. 2019; 2019 (16):2965-2968.
Chicago/Turabian StyleYunfeng Xia; Xinming Song; Zhidong Jia; Xilin Wang; Jinfeng Qi; Zheng Xu. 2019. "Research on antenna for detecting the corona discharge of transmission line." The Journal of Engineering 2019, no. 16: 2965-2968.
In order to explore the partial discharge characteristics of 10 kV XLPE insulated cable (hereinafter referred to as ‘XLPE cable’), first six typical defects are made on the main insulation according to the requirements of the installation process and the key process in which quality problem easily occur. They are: The main insulation has a dent, the main insulation has a knife wound, the main insulation has a metal tip, the main insulation surface has impurities, the high voltage end has a metal tip, and the stripping of the semi-conductive fracture is irregular. Then, the voltage step up test is carried out, and the test is monitored by the local discharge detection system. The test results show that the typical defects caused by the installation of 10 kV XLPE cable joint will produce serious local discharge phenomenon, and the initial discharge voltage is low and the stable discharge quantity is large.
Yunfeng Xia; Xinming Song; Jianzong He; Zhidong Jia; Xilin Wang. Simulation and partial discharge detection for typical defects of 10 kV cable the joint. The Journal of Engineering 2019, 2019, 2856 -2859.
AMA StyleYunfeng Xia, Xinming Song, Jianzong He, Zhidong Jia, Xilin Wang. Simulation and partial discharge detection for typical defects of 10 kV cable the joint. The Journal of Engineering. 2019; 2019 (16):2856-2859.
Chicago/Turabian StyleYunfeng Xia; Xinming Song; Jianzong He; Zhidong Jia; Xilin Wang. 2019. "Simulation and partial discharge detection for typical defects of 10 kV cable the joint." The Journal of Engineering 2019, no. 16: 2856-2859.
Recently, composite materials with nonlinear dielectric or resistive properties performed well in electric field homogenization and space charge suppression in a high voltage transmission and distribution system. For the purpose of obtaining insulation materials with desirable dielectric and electrical resistance properties, we investigated several fillers with nonlinear electrical properties doped in silicon rubber composites, and their dependency on the temperature and field. The samples of silicone rubber composites with different components were prepared using barium strontium titanate (BST) and zinc oxide (ZnO) as the filler, and high temperature vulcanized silicone rubber (SiR) as the matrix. The investigations revealed that the BST-doped samples showed different dielectric properties compared to ZnO-doped composites, with an increase in the electric field, which was nonlinear. The resistivity of both doped samples was similar. Results demonstrated that it was possible to achieve higher values of permittivity, and lower values of tanδ and resistivity, with respect to unfilled silicone rubber composites over a wide electrical field and temperature range. Discussion of the results attributes these important functional behaviours to the spontaneous polarization of nonlinear nanoparticles and the interaction between the SiR chains and the nonlinear nanoparticles at the interfacial area.
Juyi Guo; Xilin Wang; Zhidong Jia; Jun Wang; Chuan Chen. Nonlinear Electrical Properties and Field Dependency of BST and Nano-ZnO-Doped Silicone Rubber Composites. Molecules 2018, 23, 3153 .
AMA StyleJuyi Guo, Xilin Wang, Zhidong Jia, Jun Wang, Chuan Chen. Nonlinear Electrical Properties and Field Dependency of BST and Nano-ZnO-Doped Silicone Rubber Composites. Molecules. 2018; 23 (12):3153.
Chicago/Turabian StyleJuyi Guo; Xilin Wang; Zhidong Jia; Jun Wang; Chuan Chen. 2018. "Nonlinear Electrical Properties and Field Dependency of BST and Nano-ZnO-Doped Silicone Rubber Composites." Molecules 23, no. 12: 3153.
Metal oxide arresters (MOA) are widely used for over-voltage protection of power facilities in 10 kV distribution networks, and it is hard to determine the failure ones. This study presented an online monitor for 10 kV MOA used in substation. Firstly, with simulation on electromagnetic transient program (EMTP), the authors found that the resistive component of leakage current flowing through the MOA could reflect its health status. Then the principle of detecting the resistive leakage current flowing MOA by the harmonic analysis method is introduced. Finally, a remote monitoring system for MOA based on wireless communication technology is built and testing experiments of monitoring the health status of MOA has been done.
Xinming Song; Yunfeng Xia; Jianzong He; Zhidong Jia; Xilin Wang. Development of online monitor for substation 10 kV MOA. The Journal of Engineering 2018, 2019, 701 -704.
AMA StyleXinming Song, Yunfeng Xia, Jianzong He, Zhidong Jia, Xilin Wang. Development of online monitor for substation 10 kV MOA. The Journal of Engineering. 2018; 2019 (16):701-704.
Chicago/Turabian StyleXinming Song; Yunfeng Xia; Jianzong He; Zhidong Jia; Xilin Wang. 2018. "Development of online monitor for substation 10 kV MOA." The Journal of Engineering 2019, no. 16: 701-704.
Silicone rubber composite materials, especially high-temperature vulcanized (HTV) insulators, are widely used in high-voltage transmission lines. Previous studies have shown that the degree of aging of an HTV material is approximately linear with its hardness. The hardness measurement relies on laboratory analysis after sampling, and there is no alternative hardness test available for on-site application. In this paper, the ablation characteristics of HTV materials and the spectral and temperature characteristics of the corresponding plasmas were investigated via laser-induced breakdown spectroscopy (LIBS), thereby laying the foundation for the subsequent use of LIBS technology for on-site hardness characterization. A linear relationship was found between the hardness (either macroscopic or microscopic) of an HTV material and the intensity ratio of the ion line to the atomic line in the spectral data as well as a linear relationship between the hardness and the average plasma temperature corresponding to the aging layer. The results show that LIBS can serve as an effective source of hardness information for an HTV material and is therefore helpful for maintaining the safety of transmission lines.
Xilin Wang; Xiao Hong; Ping Chen; Chenlong Zhao; Zhidong Jia; Liming Wang; Lin Zou. Surface Hardness Analysis of Aged Composite Insulators via Laser-Induced Plasma Spectra Characterization. IEEE Transactions on Plasma Science 2018, 47, 387 -394.
AMA StyleXilin Wang, Xiao Hong, Ping Chen, Chenlong Zhao, Zhidong Jia, Liming Wang, Lin Zou. Surface Hardness Analysis of Aged Composite Insulators via Laser-Induced Plasma Spectra Characterization. IEEE Transactions on Plasma Science. 2018; 47 (1):387-394.
Chicago/Turabian StyleXilin Wang; Xiao Hong; Ping Chen; Chenlong Zhao; Zhidong Jia; Liming Wang; Lin Zou. 2018. "Surface Hardness Analysis of Aged Composite Insulators via Laser-Induced Plasma Spectra Characterization." IEEE Transactions on Plasma Science 47, no. 1: 387-394.
The fast detection of classical contaminants and their distribution on high-voltage transmission line insulators is essential for ensuring the safe operation of the power grid. The analysis of existing insulator contamination has traditionally relied on taking samples during a power cut, taking the samples back to the lab and then testing them with elemental analysis equipment, especially for sugars, bird droppings, and heavy metal particulates, which cannot be analysed by the equivalent salt deposit density (ESDD) or non-soluble deposit density (NSDD) methods. In this study, a novel method called laser-induced breakdown spectroscopy (LIBS) offering the advantages of no sample preparation, being nearly nondestructive and having a fast speed was applied for the analysis of metal contamination. Several LIBS parameters (laser energy and delay time) were optimized to obtain better resolution of the spectral data. The limit of detection (LOD) of the observed elements was obtained using a calibration curve. Compared to calibration curves, multivariate analysis methods including principal component analysis (PCA), k-means and partial least squares regression (PLSR) showed their superiority in analyzing metal contamination in insulators. Then, the elemental distribution of natural pollution was predicted using LIBS to fully capture information about the bulk elements (Na, Ni, Cu, Mn, Ca, etc.) of entire areas with PLSR. The results showed that LIBS could be a promising method for accurate direct online quantification of metal contamination in insulators.
Naixiao Wang; Xilin Wang; Ping Chen; Zhidong Jia; Liming Wang; Ronghui Huang; Qishen Lv. Metal Contamination Distribution Detection in High-Voltage Transmission Line Insulators by Laser-induced Breakdown Spectroscopy (LIBS). Sensors 2018, 18, 2623 .
AMA StyleNaixiao Wang, Xilin Wang, Ping Chen, Zhidong Jia, Liming Wang, Ronghui Huang, Qishen Lv. Metal Contamination Distribution Detection in High-Voltage Transmission Line Insulators by Laser-induced Breakdown Spectroscopy (LIBS). Sensors. 2018; 18 (8):2623.
Chicago/Turabian StyleNaixiao Wang; Xilin Wang; Ping Chen; Zhidong Jia; Liming Wang; Ronghui Huang; Qishen Lv. 2018. "Metal Contamination Distribution Detection in High-Voltage Transmission Line Insulators by Laser-induced Breakdown Spectroscopy (LIBS)." Sensors 18, no. 8: 2623.