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Prof. Yanpeng Hao
South China University of Technology

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Research Keywords & Expertise

0 External insulation of power transmission and transformation
0 Evaluation and expert system for icing condition of transmission lines
0 Atmospheric pressure dielectric barrier discharge
0 Insulation diagnosis and life prediction
0 Research on lightning protection and overvoltage technology of power system

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Project

Project Goal: investigate the unmanned intelligent live working technology of transmission line

Starting Date:01 January 2018

Current Stage: In research

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Project

Project Goal: Investigate the key technology of passive intelligent sensors for operation state of power transmission and transformation equipment

Starting Date:01 January 2018

Current Stage: In research

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Project

Project Goal: investigate the unmanned intelligent live working technology of transmission line

Starting Date:01 January 2018

Current Stage: In research

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Project

Project Goal: Investigate the mechanism of dielectric barrier cylindrical discharge based on the spatial distribution and time evolution of discharge modes and characteristics

Starting Date:01 January 2018

Current Stage: In research

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Project

Project Goal: Investigate the influence of icing on flashover characteristics of insulators and its early warning application

Starting Date:01 January 2012

Current Stage: Completed

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Journal article
Published: 05 April 2021 in Engineering Failure Analysis
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To investigate the optimal radial-arranged-position of the optical fiber in the cross-linked polyethylene (XLPE) power cable, the fibers were arranged into three positions, including segmental conductor center, the insulation shield surface, and the waterproof compound center, respectively, and temperatures were measured based on the Brillouin optical time-domain reflectometry (BOTDR) technology while the thermocouples were arranged at the same positions mentioned above for comparison, respectively. Four cases of cable temperature rising experiments under the laying environments of duct and water were carried out. The conductor temperatures were calculated using the temperatures measured by the fibers at the insulation shield surface and waterproof compound center, and the differences between the calculated values and the measured temperatures by thermocouples were analyzed and compared. Results show the temperature differences at different axial positions of fibers at the insulation shield surface or the waterproof compound center were less than 0.22 °C. These were much less than the differences in different axial positions of thermocouples, among which the maximum is 4.8 °C. The maximum temperature differences between the fibers and the thermocouples at the three positions mentioned above were 4.9 °C, 3.2 °C, and 3.7 °C, respectively. The maximum transient relative differences of the conductor temperature between the calculated and measured values do not exceed 7.6% and 7.1%, respectively. And the steady-state relative differences do not exceed 2.6% and 4.7%, respectively. The insulation shield surface and waterproof compound center are recommended as the optical fiber arranged-position for calculating the conductor temperature.

ACS Style

Lin Yang; Zhihao Hu; Yanpeng Hao; Weihao Qiu; Licheng Li. Internal temperature measurement and conductor temperature calculation of XLPE power cable based on optical fiber at different radial positions. Engineering Failure Analysis 2021, 125, 105407 .

AMA Style

Lin Yang, Zhihao Hu, Yanpeng Hao, Weihao Qiu, Licheng Li. Internal temperature measurement and conductor temperature calculation of XLPE power cable based on optical fiber at different radial positions. Engineering Failure Analysis. 2021; 125 ():105407.

Chicago/Turabian Style

Lin Yang; Zhihao Hu; Yanpeng Hao; Weihao Qiu; Licheng Li. 2021. "Internal temperature measurement and conductor temperature calculation of XLPE power cable based on optical fiber at different radial positions." Engineering Failure Analysis 125, no. : 105407.

Journal article
Published: 16 March 2021 in Energies
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Rain is one of the dominant meteorological factors threatening the outdoor insulation performance of ultra-high voltage (UHV) power stations. Discharge occurring on the polluted surface of post insulators in rain has always been a major concern of power stations. Previous studies have shown that suspended water droplets on the shed edge play an important role in the rain flashover process. In this work, artificial contamination rain flashover tests were carried out in a laboratory on a UHV DC (Ultra-High Voltage Direct Current) large-diameter composite post insulator, which had a rod diameter of 625 mm and alternating sheds (105 mm and 75 mm for larger and smaller shed overhang, respectively). The discharge mechanism was analyzed base on the observation of discharge phenomenon of suspended water-drops on the shed edge. Moreover, simulation models by COMSOL Multiphysics were established to investigate the electric field around sheds and suspended water-drops, as well as the shape change of water droplets on the insulation surface, especially at the edge of the shed. Results show that the shape parameters of water-droplets changed continuously under the combined action of gravity, surface tension, and capillary tension. Suspended water-droplets on the shed edge showed a great influence on the electric field distribution, and the resulting discharge lead to the bridging between sheds. This work paves a new way to revealing the contamination rain flashover mechanism on post insulators and provides critical knowledge for power stations on preventing flashover accidents.

ACS Style

Yifan Liao; Qiao Wang; Lin Yang; Zhiqiang Kuang; Yanpeng Hao; Chuyan Zhang. Discharge Behavior and Morphological Characteristics of Suspended Water-Drop on Shed Edge during Rain Flashover of Polluted Large-Diameter Post Insulator. Energies 2021, 14, 1652 .

AMA Style

Yifan Liao, Qiao Wang, Lin Yang, Zhiqiang Kuang, Yanpeng Hao, Chuyan Zhang. Discharge Behavior and Morphological Characteristics of Suspended Water-Drop on Shed Edge during Rain Flashover of Polluted Large-Diameter Post Insulator. Energies. 2021; 14 (6):1652.

Chicago/Turabian Style

Yifan Liao; Qiao Wang; Lin Yang; Zhiqiang Kuang; Yanpeng Hao; Chuyan Zhang. 2021. "Discharge Behavior and Morphological Characteristics of Suspended Water-Drop on Shed Edge during Rain Flashover of Polluted Large-Diameter Post Insulator." Energies 14, no. 6: 1652.

Journal article
Published: 02 February 2021 in Engineering Failure Analysis
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Recently, high-voltage XLPE cables often suffer from buffer layer failures. The typical characteristics are white powder and ablation appear on the insulation screens, buffer layers, and corrugated aluminum (Al) sheaths. However, little is known about the causes of failure. In this paper, two test platforms of material samples and a cable sample were set up. Partial discharge tests were carried out with material samples, a cable sample, and buffer layer simulation samples to study the resistance and discharge characteristics under different connection conditions between the insulation screen and corrugated Al sheath (IS-Al). The buffer layer’s ablation was reproduced in the material samples test. The material samples test revealed that partial discharge was easy to occur when IS-Al’s air gaps were tiny, or the IS-Al was “point connection” without air gaps. The buffer layer simulation samples test indicated that the better the IS-Al’s connection conditions are, the smaller the resistance, potential difference, and discharge quantity are, and the more stable the discharge pulse is. Judging from these results, the IS-Al’s connection conditions seem to impact the buffer layer failures of high-voltage XLPE cables.

ACS Style

Yun Chen; Baojun Hui; Yanting Cheng; Yanwen Chen; Yanpeng Hao; Mingli Fu; Lin Yang; Licheng Li. Effects of connection conditions between insulation screen and Al sheath on the buffer layer failures of high-voltage XLPE cables. Engineering Failure Analysis 2021, 122, 105263 .

AMA Style

Yun Chen, Baojun Hui, Yanting Cheng, Yanwen Chen, Yanpeng Hao, Mingli Fu, Lin Yang, Licheng Li. Effects of connection conditions between insulation screen and Al sheath on the buffer layer failures of high-voltage XLPE cables. Engineering Failure Analysis. 2021; 122 ():105263.

Chicago/Turabian Style

Yun Chen; Baojun Hui; Yanting Cheng; Yanwen Chen; Yanpeng Hao; Mingli Fu; Lin Yang; Licheng Li. 2021. "Effects of connection conditions between insulation screen and Al sheath on the buffer layer failures of high-voltage XLPE cables." Engineering Failure Analysis 122, no. : 105263.

Journal article
Published: 25 January 2021 in IEEE Transactions on Instrumentation and Measurement
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The multifactor accelerated aging test is an important means to predict the lifetime of gas-insulated switchgear (GIS) O-ring seals, while the leakage rate (LR) is a potential index for failure evaluation. This article proposed a three-factor accelerated aging test platform and a leakage test system (LTS) for GIS seal rings. The aging factors are thermal, mechanical compression, and pressured SF 6 gas. The pressure aging vessel (PAV) can be filled with various gases to simulate the operating conditions of the GIS and age multiple samples simultaneously. During the aging process, leakage tests are conducted on flange pairs without disassembling and separating the seal rings. After the test, the aging can be continued so as to study the evolution of LR with aging time. In order to analyze the properties of leakage test and validate the platform, a three-factor accelerated aging and a traditional two-factor accelerated aging (thermal and compression) were conducted on GIS O-ring seals of EPDM material. Compression set (CS) and LR were tested. The result showed that a steady inherent LR $F_{0}$ exists for the LTS. The LR rose linearly with accumulating time, allowing simplified calculation of LR. The three-factor aged samples had significantly smaller CS than those of the two-factor aged samples, indicating that the working condition of GIS with SF 6 atmosphere significantly slows the aging rate of GIS seal rings. The findings proved that the three-factor accelerated aging test platform and LTS effectively simulate the operating conditions of GIS seal rings and evaluate their properties.

ACS Style

Zhimin Zhang; Yanpeng Hao; Jiahao Peng; Lin Yang; Chao Gao; Guoli Wang; Fusheng Zhou; Yun Yang; Hangyu Cao; Licheng Li. A Three-Factor Accelerated Aging Test Platform of Thermal, Mechanical Compression, Pressured SF6, and a Leakage Test System for GIS O-Ring Seals. IEEE Transactions on Instrumentation and Measurement 2021, 70, 1 -11.

AMA Style

Zhimin Zhang, Yanpeng Hao, Jiahao Peng, Lin Yang, Chao Gao, Guoli Wang, Fusheng Zhou, Yun Yang, Hangyu Cao, Licheng Li. A Three-Factor Accelerated Aging Test Platform of Thermal, Mechanical Compression, Pressured SF6, and a Leakage Test System for GIS O-Ring Seals. IEEE Transactions on Instrumentation and Measurement. 2021; 70 ():1-11.

Chicago/Turabian Style

Zhimin Zhang; Yanpeng Hao; Jiahao Peng; Lin Yang; Chao Gao; Guoli Wang; Fusheng Zhou; Yun Yang; Hangyu Cao; Licheng Li. 2021. "A Three-Factor Accelerated Aging Test Platform of Thermal, Mechanical Compression, Pressured SF6, and a Leakage Test System for GIS O-Ring Seals." IEEE Transactions on Instrumentation and Measurement 70, no. : 1-11.

Journal article
Published: 30 September 2020 in IEEE Access
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Domain adaptive object detection aims to build an object detector for the unlabeled target domain by transferring knowledge from a well-labeled source domain, which can alleviate the problem of cumbersome labeling of object detection in cross-scene power transmission line inspection. Remarkable advances are made recently by mitigating distributional shifts via hierarchical domain feature alignment training of detection networks. However, domain adaptive object detection is still limited in learning the invariance representation of multi-scale features. Specifically, the scale of objects varies in the scenes of aerial inspection, which hinders the knowledge transfer from the labeled source domain. In this paper, we propose a multi-scale feature enhanced domain adaptation method for cross-domain object detection of power transmission lines inspection. The proposed method consists of two components: 1) Multi-Scale Fusion Feature Alignment module (MSFA) to strengthen similar representation characteristics of different scales object in domain adaptive by utilizing context information conveyed from other levels; 2) Multi-Scale Consistency Regularization module (MSCR) to jointly optimize the multi-scale feature learning of each level, which promotes domain invariant feature learning at each level. Experimental results demonstrate that our method significantly increases the performance of the object detector in several cross-scene transmission line inspection tasks.

ACS Style

Pengyu Zhang; Zhe Zhang; Yanpeng Hao; Zhiheng Zhou; Bing Luo; Tingting Wang. Multi-Scale Feature Enhanced Domain Adaptive Object Detection For Power Transmission Line Inspection. IEEE Access 2020, 8, 182105 -182116.

AMA Style

Pengyu Zhang, Zhe Zhang, Yanpeng Hao, Zhiheng Zhou, Bing Luo, Tingting Wang. Multi-Scale Feature Enhanced Domain Adaptive Object Detection For Power Transmission Line Inspection. IEEE Access. 2020; 8 ():182105-182116.

Chicago/Turabian Style

Pengyu Zhang; Zhe Zhang; Yanpeng Hao; Zhiheng Zhou; Bing Luo; Tingting Wang. 2020. "Multi-Scale Feature Enhanced Domain Adaptive Object Detection For Power Transmission Line Inspection." IEEE Access 8, no. : 182105-182116.

Journal article
Published: 24 September 2020 in Energies
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The discharges of water columns and droplets between the sheds make the leakage distance not effectively used, which is one of the main reasons for flashover of composite post insulators under heavy rainfall. To study the influence of shed parameters on surface rainwater characteristics, artificial rain tests were carried out on the large-diameter composite post insulators under the rainfall intensity of 2–15 mm/min. Lwc (the length of water columns at the edge of large sheds), Nwc (the number of water columns at the edge of large sheds), Nwde (the number of water droplets at the edge of large sheds) and Nwds (the number of water droplets in the space between two adjacent large sheds) were proposed as the parameters of surface rainwater characteristics. The influences of large shed spacing, large shed overhang and rod diameter on the parameters of surface rainwater characteristics under different rainfall intensities were analyzed. The experimental results show that, under the same rainfall intensity, with the rise in large shed spacing, large shed overhang or rod diameter, Lwc, Nwc, Nwde and Nwds all increase. Under different rainfall intensities, the trends of the parameters with the change in shed parameters are basically invariant; however, the change ranges of the parameters are different. The increases in the parameters with the rises in shed parameters and rainfall intensity are mainly attributed to the change in the rainfall on the insulator surface. The experimental results can provide references for the quantitative description of surface rainwater characteristics and the design of large-diameter composite post insulators for DC transmission systems.

ACS Style

Yanpeng Hao; Yifan Liao; Zhiqiang Kuang; Yijie Sun; Gaofeng Shang; Weixun Zhang; Guiyun Mao; Lin Yang; Fuzeng Zhang; Licheng Li. Experimental Investigation on Influence of Shed Parameters on Surface Rainwater Characteristics of Large-Diameter Composite Post Insulators under Rain Conditions. Energies 2020, 13, 5011 .

AMA Style

Yanpeng Hao, Yifan Liao, Zhiqiang Kuang, Yijie Sun, Gaofeng Shang, Weixun Zhang, Guiyun Mao, Lin Yang, Fuzeng Zhang, Licheng Li. Experimental Investigation on Influence of Shed Parameters on Surface Rainwater Characteristics of Large-Diameter Composite Post Insulators under Rain Conditions. Energies. 2020; 13 (19):5011.

Chicago/Turabian Style

Yanpeng Hao; Yifan Liao; Zhiqiang Kuang; Yijie Sun; Gaofeng Shang; Weixun Zhang; Guiyun Mao; Lin Yang; Fuzeng Zhang; Licheng Li. 2020. "Experimental Investigation on Influence of Shed Parameters on Surface Rainwater Characteristics of Large-Diameter Composite Post Insulators under Rain Conditions." Energies 13, no. 19: 5011.

Journal article
Published: 26 August 2020 in IEEE Access
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To perfect the wetting mechanism of hydrophobic insulators, it is urgent to explore the impact of hydrophobicity on wetting characteristics of the pollution layer of composite insulators. In this paper, the wetting test of the hydrophobic pollution layer was carried out in artificial hot fog. The local surface conductivity of the pollution layer with different hydrophobicity were measured. The test results show that the local surface conductivities of different hydrophobic pollution layers are obviously different at the same wetting time. For researching the regularity of wetting process in greater detail, three characteristic quantities were proposed to represent the wetting characteristics. They are the duration of local surface conductivity close to zero (DLSCCZ), the saturated wetting time (SWT) and the maximum value of local surface conductivity (MVLSC). With the enhancement of hydrophobicity of the pollution layer, DLSCCZ and SWT increase, while MVLSC and the growth velocity of local surface conductivity both decrease.

ACS Style

Jikai Bi; Yanpeng Hao; Lin Yang; Yao Zheng; Licheng Li. Impact of Hydrophobicity on Wetting Characteristics of Composite Insulators. IEEE Access 2020, 8, 159316 -159323.

AMA Style

Jikai Bi, Yanpeng Hao, Lin Yang, Yao Zheng, Licheng Li. Impact of Hydrophobicity on Wetting Characteristics of Composite Insulators. IEEE Access. 2020; 8 (99):159316-159323.

Chicago/Turabian Style

Jikai Bi; Yanpeng Hao; Lin Yang; Yao Zheng; Licheng Li. 2020. "Impact of Hydrophobicity on Wetting Characteristics of Composite Insulators." IEEE Access 8, no. 99: 159316-159323.

Journal article
Published: 30 July 2020 in IEEE Access
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The flashover performance of insulators can be improved by BS (booster sheds) in the rain, which is mainly attributed to the reasons that BS break up long cascades of water and block connections of arcs. However, surface rainwater characteristics and arc characteristics of bushing have not been quantitatively studied under heavy rainfall. In this paper, the artificial rain tests were conducted on a 500 kV transformer high-voltage bushing equipped with and without BS under the rainfall intensity of 10 mm/min. X (the total length of water column) and Larc (the critical length of arc) on the bushing surface were taken as the feature parameters of surface rainwater characteristics and arc characteristics, respectively. The effects of BS on Eh (the rain flashover voltage gradient along the insulation height), X and Larc were investigated, respectively. Furtherly, the relationships were studied among Eh, X and Larc. Results indicate that Eh has a sharp rise as the number of BS (NBS) is from one to two, however the rise of Eh gradually decreases when NBS exceeds two. X decreases while Larc increases with the rise of NBS, however both the change ranges of them continually fall. Furthermore, Larc presents remarkable negative correlation to X because of the effect of the electric field. Eh rises nonlinearly with the decrease of X, which is due to the change of the wetting uniformity on the bushing surface and the potential redistribution along air gaps in the presence of the local arc.

ACS Style

Lin Yang; Zhiqiang Kuang; Yijie Sun; Yifan Liao; Yanpeng Hao; Licheng Li; Fuzeng Zhang. Study on Surface Rainwater and Arc Characteristics of High-Voltage Bushing With Booster Sheds Under Heavy Rainfall. IEEE Access 2020, 8, 146865 -146875.

AMA Style

Lin Yang, Zhiqiang Kuang, Yijie Sun, Yifan Liao, Yanpeng Hao, Licheng Li, Fuzeng Zhang. Study on Surface Rainwater and Arc Characteristics of High-Voltage Bushing With Booster Sheds Under Heavy Rainfall. IEEE Access. 2020; 8 (99):146865-146875.

Chicago/Turabian Style

Lin Yang; Zhiqiang Kuang; Yijie Sun; Yifan Liao; Yanpeng Hao; Licheng Li; Fuzeng Zhang. 2020. "Study on Surface Rainwater and Arc Characteristics of High-Voltage Bushing With Booster Sheds Under Heavy Rainfall." IEEE Access 8, no. 99: 146865-146875.

Journal article
Published: 20 July 2020 in Energies
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Internal stress in basin insulators of gas-insulated metal-enclosed switchgear (GIS) can lead to cracks, which affects the safe operation of these apparatuses. In this research, we proposed a subsurface internal stress measurement method for GIS epoxy composites. This method is based on an ultrasonic longitudinal critically refracted (LCR) wave technique. In this study, some epoxy composite specimens were synthesized with similar materials and manufacturing processes to those of 252 kV GIS basin insulators. An ultrasonic stress measurement system that utilized the LCR wave technique was set-up to investigate the relationship between stress and LCR wave propagation time, as well as to measure the compressive stress of the epoxy specimen within 0–50 MPa. The results show that LCR wave propagation time linearly decreased when stress increased in the subsurface zone and the acoustoelastic coefficient was −4.95. We found the relative errors of stress measurements to be less than 13%.

ACS Style

Zhouyiao Zou; Yanpeng Hao; Yao Zheng; Weiming He; Fangyuan Tian; Lin Yang; Licheng Li. Subsurface Stress Measurement in GIS Epoxy Composite by Using LCR Waves. Energies 2020, 13, 3725 .

AMA Style

Zhouyiao Zou, Yanpeng Hao, Yao Zheng, Weiming He, Fangyuan Tian, Lin Yang, Licheng Li. Subsurface Stress Measurement in GIS Epoxy Composite by Using LCR Waves. Energies. 2020; 13 (14):3725.

Chicago/Turabian Style

Zhouyiao Zou; Yanpeng Hao; Yao Zheng; Weiming He; Fangyuan Tian; Lin Yang; Licheng Li. 2020. "Subsurface Stress Measurement in GIS Epoxy Composite by Using LCR Waves." Energies 13, no. 14: 3725.

Journal article
Published: 25 June 2020 in IEEE Access
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Flashover accidents on high-voltage bushings frequently occur under extreme rainfall, which is generally attributed to the bridging of adjacent sheds by pendant drops, a result of the dynamic deformation of pendant drops. We numerically investigate the effects of the parameters of pendant drops and the electric field on the dynamic deformation of pendant drops on a 500 kV transformer bushing under extreme rainfall and verify the simulation results by artificial rain experiment. The dynamic deformation of pendant drops is described by solving the Navier-Stokes equations and using the level set method. The results show that the maximum length of the pendant drop increases with the increase in the initial diameter and the initial mass flow rate, respectively, but decreases under the electric field. The main influencing factor on the maximum length of the pendant drop alters with the variation of the initial diameter and the initial mass flow rate in the absence of the electric field, whereas the initial mass flow rate is the unique main influencing factor in the presence of the electric field. Furthermore, the variations of the maximum length and breakup time of the pendant drop are elucidated by the instability of the pendant drop.

ACS Style

Lin Yang; Yijie Sun; Yifan Liao; Zhiqiang Kuang; Yanpeng Hao; Licheng Li; Fuzeng Zhang. Dynamic Deformation of Pendant Drops on the Edge of High-Voltage Bushing Sheds Under Extreme Rainfall. IEEE Access 2020, 8, 118101 -118113.

AMA Style

Lin Yang, Yijie Sun, Yifan Liao, Zhiqiang Kuang, Yanpeng Hao, Licheng Li, Fuzeng Zhang. Dynamic Deformation of Pendant Drops on the Edge of High-Voltage Bushing Sheds Under Extreme Rainfall. IEEE Access. 2020; 8 ():118101-118113.

Chicago/Turabian Style

Lin Yang; Yijie Sun; Yifan Liao; Zhiqiang Kuang; Yanpeng Hao; Licheng Li; Fuzeng Zhang. 2020. "Dynamic Deformation of Pendant Drops on the Edge of High-Voltage Bushing Sheds Under Extreme Rainfall." IEEE Access 8, no. : 118101-118113.

Journal article
Published: 20 April 2020 in Engineering Failure Analysis
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In recent years, insulation failures on HV XLPE cables caused by buffer layers between corrugated Al sheaths and insulation screens have been reported and cause many concerns. Lots of white powder and ablated traces appeared in the buffer layers of these cables. In this paper, the failure characteristics and phenomena were carefully examined through incomplete statistics and the field sectioned cables, respectively. Then, investigations were performed by means of visual examination, optical microscopy, chemical examination, and resistance measurement. Treeing analysis reveals that the XLPE insulation layer is caused by the failure mechanism rather than the cause of it. SEM, EDAX, and XPS analysis demonstrated the formation process of the white powder and the electrochemical reaction between the Al sheath and the white powder. Resistance analysis pointed out that the unqualified copper wire braid and the insulated white powder causes the insulation screen to lose its connection to the Al sheath. Taking the manufacturing environment, laying environment, and laying method of cables into account, water is chiefly responsible for the formation of white powder and the electrochemical corrosion of Al sheath, which is validated with the precipitation experiment. Finally, the effect of white powder on the failure and the cause of electrochemical corrosion were discussed. The failure cause was identified in the white powder and the thin copper wires that induced a potential difference between the Al sheath and the insulation screen and its subsequent partial discharges and breakdown.

ACS Style

Yun Chen; Baojun Hui; Yanting Cheng; Yanpeng Hao; Mingli Fu; Lin Yang; Shuai Hou; Licheng Li. Failure investigation of buffer layers in high-voltage XLPE cables. Engineering Failure Analysis 2020, 113, 104546 .

AMA Style

Yun Chen, Baojun Hui, Yanting Cheng, Yanpeng Hao, Mingli Fu, Lin Yang, Shuai Hou, Licheng Li. Failure investigation of buffer layers in high-voltage XLPE cables. Engineering Failure Analysis. 2020; 113 ():104546.

Chicago/Turabian Style

Yun Chen; Baojun Hui; Yanting Cheng; Yanpeng Hao; Mingli Fu; Lin Yang; Shuai Hou; Licheng Li. 2020. "Failure investigation of buffer layers in high-voltage XLPE cables." Engineering Failure Analysis 113, no. : 104546.

Journal article
Published: 26 March 2020 in Sensors
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Icing detection of composite insulators is essential for the security and stability of power grids. As conventional methods have met difficulties in harsh weather, a 110 kV composite insulator with embedded Fiber Bragg Gratings (FBGs) was proposed for detecting glaze icing in this paper. FBG temperature compensation sensors in ceramic tubes were adopted for simultaneous measurement of icicle loads and temperature. Then, temperature calibration experiments and simulated icicle load experiments were carried out to obtain temperature and icicle load characteristics of FBGs. The results showed that temperature sensitivities of FBG strain sensors and FBG temperature compensation sensors were 18.16 pm/°C, and 13.18 pm/°C, respectively. Besides, wavelength shifts were linearly related to icicle loads within the polar angle range of −60° to 60°, and the load coefficient of FBG facing the icicle was -34.6 pm/N. In addition, the wavelength shift generated by several icicles was equal to the sum of wavelength shifts generated by each icicle within the polar angle range of −15° to 15°. Finally, icicles can cause wavelength shifts of FBGs within a big shed spacing. The paper provides a novel icing detection technology for composite insulators in transmission lines.

ACS Style

Jie Wei; Yanpeng Hao; Yuan Fu; Lin Yang; Jiulin Gan; Han Li. Experimental Study on Glaze Icing Detection of 110 kV Composite Insulators Using Fiber Bragg Gratings. Sensors 2020, 20, 1834 .

AMA Style

Jie Wei, Yanpeng Hao, Yuan Fu, Lin Yang, Jiulin Gan, Han Li. Experimental Study on Glaze Icing Detection of 110 kV Composite Insulators Using Fiber Bragg Gratings. Sensors. 2020; 20 (7):1834.

Chicago/Turabian Style

Jie Wei; Yanpeng Hao; Yuan Fu; Lin Yang; Jiulin Gan; Han Li. 2020. "Experimental Study on Glaze Icing Detection of 110 kV Composite Insulators Using Fiber Bragg Gratings." Sensors 20, no. 7: 1834.

Journal article
Published: 07 March 2020 in Energies
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Situations of internal stress in basin insulators inside gas-insulated metal-enclosed switchgear (GIS) can lead to cracks, which can influence the safety and stability of apparatus. However, there is currently no research on internal stress measurements for composites of GIS basin insulators, and only measurements for surface stress. In this paper, an internal stress measurement method for GIS epoxy composite is proposed using an ultrasonic longitudinal through-transmission technique based on the acoustoelastic effect. An internal stress measurement system is developed to investigate the relationship between the uniaxial compressive internal stress and the velocity of the ultrasonic wave vertical to the stress in epoxy composite within a range of 0–70 MPa, and to calculate the acoustoelastic coefficient of epoxy composite. The effects of system delay are eliminated in measuring the propagation time. Some epoxy composite cuboid specimens with similar materials and using a manufacturing process similar to those of 252 kV GIS basin insulators are synthesized, and the uniformity of the internal stress in cuboid specimens is verified by finite element simulation. The results reveal a linear increase of the ultrasonic longitudinal wave velocity with increasing stress. It has been shown that the average acoustoelastic coefficient of GIS epoxy composites, using the longitudinal waves vertical to the stress, is 4.556 × 10−5/MPa. Additionally, the absolute errors of the internal stress measurements are less than 12.397 MPa. This research shows that the ultrasonic method based on the acoustoelastic effect for measuring the internal stress in GIS epoxy composites is feasible.

ACS Style

Zhouyiao Zou; Yanpeng Hao; Fangyuan Tian; Yao Zheng; Weiming He; Lin Yang; Licheng Li. An Ultrasonic Longitudinal Through-Transmission Method to Measure the Compressive Internal Stress in Epoxy Composite Specimens of Gas-Insulated Metal-Enclosed Switchgear. Energies 2020, 13, 1248 .

AMA Style

Zhouyiao Zou, Yanpeng Hao, Fangyuan Tian, Yao Zheng, Weiming He, Lin Yang, Licheng Li. An Ultrasonic Longitudinal Through-Transmission Method to Measure the Compressive Internal Stress in Epoxy Composite Specimens of Gas-Insulated Metal-Enclosed Switchgear. Energies. 2020; 13 (5):1248.

Chicago/Turabian Style

Zhouyiao Zou; Yanpeng Hao; Fangyuan Tian; Yao Zheng; Weiming He; Lin Yang; Licheng Li. 2020. "An Ultrasonic Longitudinal Through-Transmission Method to Measure the Compressive Internal Stress in Epoxy Composite Specimens of Gas-Insulated Metal-Enclosed Switchgear." Energies 13, no. 5: 1248.

Journal article
Published: 20 January 2020 in IEEE Access
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This paper reveals a correlation between morphology and thermal parameters on cross-linked polyethylene (XLPE) cable with different insulating states. Several cables were selected to detect the physicochemical and thermal parameters of the XLPE. The results show that the cable ampacity is determined by the thermal parameters, which are deeply subjected to the morphology of the XLPE. The molecular chain and crystal structure of the XLPE have a close connection with the thermal resistivity. The physicochemical parameters of carbonyl index (CI) and unsaturated band index (UBI) from Fourier transform infrared spectrum (FTIR) and melting range (Rm) from differential scanning calorimetry (DSC) can be the indicator to evaluate the diversity of the thermal resistivity. The change of thermal capacity is governed by the crystal distribution of the XLPE. The physicochemical parameters of crystallinity (χ) and lamellar thickness (L) from DSC can be the indicator to evaluate the change of the thermal capacity. In addition, FWHM of the crystallization peak ΔW, crystalline rate index (T0-TP) and cross-linking degree (G) can also be the indicator of the thermal parameters. Finally, this paper proposes a more accurate on-line monitoring method for electric power industry by detecting thermal parameters to diagnose the operating cables in the practical application.

ACS Style

Yifeng Zhao; Zhuozhan Han; Yue Xie; Xinghui Fan; Yangyang Nie; Pengyu Wang; Gang Liu; Yanpeng Hao; Jiasheng Huang; Wenwei Zhu. Correlation Between Thermal Parameters and Morphology of Cross-Linked Polyethylene. IEEE Access 2020, 8, 19726 -19736.

AMA Style

Yifeng Zhao, Zhuozhan Han, Yue Xie, Xinghui Fan, Yangyang Nie, Pengyu Wang, Gang Liu, Yanpeng Hao, Jiasheng Huang, Wenwei Zhu. Correlation Between Thermal Parameters and Morphology of Cross-Linked Polyethylene. IEEE Access. 2020; 8 (99):19726-19736.

Chicago/Turabian Style

Yifeng Zhao; Zhuozhan Han; Yue Xie; Xinghui Fan; Yangyang Nie; Pengyu Wang; Gang Liu; Yanpeng Hao; Jiasheng Huang; Wenwei Zhu. 2020. "Correlation Between Thermal Parameters and Morphology of Cross-Linked Polyethylene." IEEE Access 8, no. 99: 19726-19736.

Journal article
Published: 06 January 2020 in IEEE Access
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In this work, heat treatment was performed on three retired 110 kV AC cables with service years of 0, 15 and 30, and the effects on the thermal and electrical performance of the cable insulation were investigated. First, each cable with a length approximately of 5 m was prepared and cut into five equal segments. Four segments of each cable were annealed at a temperature of 90, 95, 100, or 105 °C by building a small circuit to simulate cable operation. Then, a section at the middle of each segment was cut out, and the insulation layer was peeled away. The peeled-off layers from the inner, middle and outer positions were selected as the test samples. Subsequently, Fourier transform infrared spectrometry (FTIR), and differential scanning calorimetry (DSC) were performed, and the DC conduction current and dielectric breakdown strength were measured. The best thermal properties of the highest melting point, crystallinity, and smallest melting range were found when the cables were annealed at 100, 105, and 105 °C for the inner, middle, and outer positions, respectively. The highest dielectric breakdown strength and lowest electrical conductivity were found at temperatures of 95 or 100 °C for the inner and middle positions, respectively, and at 105 °C for the outer position. The FTIR results showed that thermal annealing for hundreds of hours did not adversely affect the molecular chains. It is found that this type of heat treatment could be a feasible method to rejuvenate retired cables, and a conservative temperature of 95 °C is regarded as the optimum annealing temperature.

ACS Style

Yue Xie; Yifeng Zhao; Shuzhen Bao; Pengyu Wang; Jiasheng Huang; Gang Liu; Yanpeng Hao; Licheng Li. Rejuvenation of Retired Power Cables by Heat Treatment: Experimental Simulation in Lab. IEEE Access 2020, 8, 5635 -5643.

AMA Style

Yue Xie, Yifeng Zhao, Shuzhen Bao, Pengyu Wang, Jiasheng Huang, Gang Liu, Yanpeng Hao, Licheng Li. Rejuvenation of Retired Power Cables by Heat Treatment: Experimental Simulation in Lab. IEEE Access. 2020; 8 (99):5635-5643.

Chicago/Turabian Style

Yue Xie; Yifeng Zhao; Shuzhen Bao; Pengyu Wang; Jiasheng Huang; Gang Liu; Yanpeng Hao; Licheng Li. 2020. "Rejuvenation of Retired Power Cables by Heat Treatment: Experimental Simulation in Lab." IEEE Access 8, no. 99: 5635-5643.