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学者姓名：张云霄
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Abstract ：
Electrical tree degradation is one of the main causes of insulation failure in high-frequency transformers. Electrical tree degradation is studied on pure epoxy resin (EP) and MgO/EP composites at frequencies ranging from 50 Hz to 130 kHz. The results show that the tree initiation voltage of EP decreases, while the growth rate and the expansion coefficient increase with frequency. Moreover, the bubble phenomenon at high frequencies in EP composites is discussed. Combined with trap distribution characteristics within the material, the intrinsic mechanism of epoxy composites to inhibit the growth of the electrical tree at different frequencies is discussed. It can be concluded that more deep traps and blocking effect are introduced by doping nano-MgO into EP bulks, which can improve the electrical tree resistance performance of EP composites in a wide frequency range.
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| GB/T 7714 | Zhang, Yunxiao , Lin, Wenxin , Zhou, Yuanxiang et al. Electrical tree degradation of MgO/epoxy resin composites at different voltage frequencies [J]. | HIGH VOLTAGE , 2024 , 9 (3) : 581-590 . |
| MLA | Zhang, Yunxiao et al. "Electrical tree degradation of MgO/epoxy resin composites at different voltage frequencies" . | HIGH VOLTAGE 9 . 3 (2024) : 581-590 . |
| APA | Zhang, Yunxiao , Lin, Wenxin , Zhou, Yuanxiang , Xing, Weiwei , Cheng, Jiayu , Teng, Chenyuan . Electrical tree degradation of MgO/epoxy resin composites at different voltage frequencies . | HIGH VOLTAGE , 2024 , 9 (3) , 581-590 . |
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Accurate lifetime prediction of transformer oil-paper insulation is of great significance in ensuring the safe and stable operation of a power system. In this paper, the internal mechanism relationship between interfacial polarization and aging oil-paper insulation is analyzed based on a microscopic dielectric response mechanism. Based on a mixed polarization model, an equivalent circuit topology with an interfacial polarization branch is introduced on the basis of an extended Debye model, and the application of interfacial charge polarization characteristics in oil-paper insulation life prediction is explored. First, the universal relaxation polarization law behind the spectrum changes in the process of temperature rise is analyzed, and the recovery voltage polarization spectrum is reconstructed based on the mixed polarization model. Combined with the influence law of temperature on the principal time constant and model parameters, a calculation method for the activation energy of oil-paper insulation in a single temperature test is proposed. The frequency-temperature translation factor is constructed from the interface polarization capacitance. Secondly, the change rule of dielectric loss factor with the deepening of aging is analyzed, the internal relationship between loss peak shift and relaxation time of interfacial polarization is explored, and a new characteristic parameter in frequency domain, the interfacial polarization branch pole Ph2 is refined to characterize the polymerization degree content of oil-paper insulation. Finally, an oil-paper insulation life prediction model is constructed by combining interface polarization branch pole Ph2 , frequency-temperature translation factor and a loss accumulation dynamic equation, and the measured data of a transformer of different operating years are substituted into the model to verify its effectiveness. This provides a new idea for oil-paper insulation life prediction. © 2024 Power System Protection and Control Press. All rights reserved.
Keyword ：
Activation energy Activation energy Capacitance Capacitance Dielectric losses Dielectric losses Equivalent circuits Equivalent circuits Forecasting Forecasting Frequency domain analysis Frequency domain analysis Insulation Insulation Oil filled transformers Oil filled transformers Polarization Polarization Poles Poles Polymerization Polymerization Topology Topology
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| GB/T 7714 | Zou, Yang , Chen, Xiaoxuan , Zhang, Yunxiao et al. А lifе рrеdiсtiоn mеthоd оf trаnsfоrmеr оil-рареr insulаtiоn bаsеd оn intеrfасiаl сhаrgе роlаrizаtiоn сhаrасtеristiсs [J]. | Power System Protection and Control , 2024 , 52 (7) : 138-148 . |
| MLA | Zou, Yang et al. "А lifе рrеdiсtiоn mеthоd оf trаnsfоrmеr оil-рареr insulаtiоn bаsеd оn intеrfасiаl сhаrgе роlаrizаtiоn сhаrасtеristiсs" . | Power System Protection and Control 52 . 7 (2024) : 138-148 . |
| APA | Zou, Yang , Chen, Xiaoxuan , Zhang, Yunxiao , Lin, Jinjia , Lin, Xinliang . А lifе рrеdiсtiоn mеthоd оf trаnsfоrmеr оil-рареr insulаtiоn bаsеd оn intеrfасiаl сhаrgе роlаrizаtiоn сhаrасtеristiсs . | Power System Protection and Control , 2024 , 52 (7) , 138-148 . |
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The unclear understanding of the water diffusion behavior posts a big challenge to the manipulation of water absorption properties in epoxy resins. Herein, we investigated the water diffusion behavior and its relationship with molecule structures inside an epoxy resin mainly by the nonequilibrium molecular dynamics and experiments. It is found that at the initial rapid water absorption stage, bound water and free water both contribute, while at the later slow water absorption stage, free water plays a dominant role. The observed evolution of free water and bound water cannot be explained by the traditional Langmuir model. In addition, molecule polarity, free volume, and segment mobility can all influence the water diffusion process. Hence, the epoxy resin with low polarity and high molecular segment mobility is endowed with higher diffusion coefficients. The saturated water absorption content is almost dependent on the polarity. The understanding of how water diffuses and what decides the diffusion process is critical to the rational design of molecule structures for improving the water resistance in epoxy resin.
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| GB/T 7714 | Liu, Yuhao , Lin, Ying , Zhang, Yunxiao et al. Understanding Water Diffusion Behaviors in Epoxy Resin through Molecular Simulations and Experiments [J]. | LANGMUIR , 2024 , 40 (9) : 4871-4880 . |
| MLA | Liu, Yuhao et al. "Understanding Water Diffusion Behaviors in Epoxy Resin through Molecular Simulations and Experiments" . | LANGMUIR 40 . 9 (2024) : 4871-4880 . |
| APA | Liu, Yuhao , Lin, Ying , Zhang, Yunxiao , Cao, Bin , Wu, Kangning , Wang, Liming . Understanding Water Diffusion Behaviors in Epoxy Resin through Molecular Simulations and Experiments . | LANGMUIR , 2024 , 40 (9) , 4871-4880 . |
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Biaxially oriented polypropylene (BOPP) film used in pulse film capacitors withstands high temperatures for a long time. This leads to frequent faults in pulse film capacitors, affecting the reliability of the pulse system. In this paper, the thermal aging tests of BOPP films at 100 degrees C for 10-80 days are carried out in this paper, and the physicochemical and electrical properties of the aging materials are characterized. The results show that more deep and shallow traps to BOPP films are introduced during the thermal aging process. With the increase in aging time, the breakdown field strength gradually decreases, and the conductivity decreases first and then increases. Under the action of thermal aging for a long time, the recrystallization of materials and the destruction of molecular chains by thermal aging are the main reasons for the increase of traps and the decrease of breakdown field strength. The former is dominant in the early stage of aging, and the latter is dominant in the late stage of aging. Therefore, the conductivity shows the law of slow decrease first and then rapid increase. The relevant research provides a theoretical foundation for the process improvement and life prediction of BOPP films.
Keyword ：
BOPP film BOPP film electrical properties electrical properties microscopy microscopy structure-property relationship structure-property relationship thermal aging thermal aging
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| GB/T 7714 | Zhang, Yunxiao , Zhang, Jiarui , Liu, Yuhao et al. Research insight into the change of aggregation structure of BOPP films and its influence on electrical properties under accelerated thermal aging [J]. | JOURNAL OF APPLIED POLYMER SCIENCE , 2024 , 141 (43) . |
| MLA | Zhang, Yunxiao et al. "Research insight into the change of aggregation structure of BOPP films and its influence on electrical properties under accelerated thermal aging" . | JOURNAL OF APPLIED POLYMER SCIENCE 141 . 43 (2024) . |
| APA | Zhang, Yunxiao , Zhang, Jiarui , Liu, Yuhao , Lin, Wenxin , Chi, Zhengnan , Zhang, Tianfeng et al. Research insight into the change of aggregation structure of BOPP films and its influence on electrical properties under accelerated thermal aging . | JOURNAL OF APPLIED POLYMER SCIENCE , 2024 , 141 (43) . |
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The increasing voltage level of HVDC transmission requires the higher electrical performance of silicone rubber used in DC cable accessories. In order to explore the excellent DC electrical performance of the composite silicone rubber material, this paper prepared the modified silicone rubber filled with different mass fraction of polydopamine modified boron nitride nanosheets, and compared and analyzed the DC electrical performance of the composite silicone rubber under different filling quantities. The results show that the space charge accumulation of silicone rubber can be effectively inhibited by the filling of boron nitride nanosheets. The DC breakdown field strength of the sample increases first and then decreases with the increase of the filling amount, and reaches the maximum value when the filling amount is 15%, which is 23.2% higher than that of pure silicone rubber. The DC conductivity decreases first and then increases, and reaches the minimum value when the filling amount is 15%. In addition, when the filling amount is 15%, the tensile strength of the sample is increased by 38.3% compared with that of pure silicone rubber, and the elongation at break of the sample is reduced only by 2.7%, basically maintaining the original elongation at break. The DC electrical and mechanical properties of boron nitride nanosheet composite silicone rubber modified with polydopamine are significantly improved compared with those without modification. The comprehensive analysis shows that the composite has better comprehensive properties when the filling amount is 15%. © 2024 Science Press. All rights reserved.
Keyword ：
Boron nitride Boron nitride Cables Cables Filling Filling HVDC power transmission HVDC power transmission III-V semiconductors III-V semiconductors Nanosheets Nanosheets Nitrides Nitrides Silicon Silicon Silicone rubber Silicone rubber Tensile strength Tensile strength
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| GB/T 7714 | Zhou, Yuanxiang , Yan, Chenning , Zhang, Yunxiao et al. DC Electrical and Mechanical Properties of Silicone Rubber Modified by Boron Nitride Nanosheets [J]. | High Voltage Engineering , 2024 , 50 (1) : 302-312 . |
| MLA | Zhou, Yuanxiang et al. "DC Electrical and Mechanical Properties of Silicone Rubber Modified by Boron Nitride Nanosheets" . | High Voltage Engineering 50 . 1 (2024) : 302-312 . |
| APA | Zhou, Yuanxiang , Yan, Chenning , Zhang, Yunxiao , Zhu, Xiaoqian . DC Electrical and Mechanical Properties of Silicone Rubber Modified by Boron Nitride Nanosheets . | High Voltage Engineering , 2024 , 50 (1) , 302-312 . |
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Cable accessory has the interface formed by cross-linked polyethylene (XLPE)/silicone rubber (SiR), which is prone to surface discharge and thus causes the failure of cable system. This article conducts the simulated experiment of thermal-mechanical aging on the interface of XLPE/SiR. The interfacial breakdown and dielectric properties under different aging states are analyzed. It is found the interfacial aging process of XLPE can be divided into the recrystallization stage and the oxidation reaction stage. The former contributes to the interfacial roughness and thus the better insulating performance, whereas the latter leads to degradation of interface, and thus the worse insulating performance. In addition, combined with the established electric field model for the interface, the differences between thermal-mechanical aging and individual thermal aging on the interface are discussed. The sample under thermal-mechanical aging reaches the maximum interfacial breakdown voltage later than that under individual thermal aging, but their performance tends to be consistent in the later stage of aging. The change of interface microstructure and its effects on electric properties of cross-linked polyethylene/silicone rubber under thermal-mechanical aging.image
Keyword ：
cable accessory cable accessory cross-linked polyethylene cross-linked polyethylene interface interface physicochemical properties physicochemical properties thermal-mechanical coupling aging thermal-mechanical coupling aging
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| GB/T 7714 | Zhang, Tianfeng , Zhang, Yunxiao , Zheng, Xin et al. Mechanistic insights into the thermal-mechanical aging of the interface of cross-linked polyethylene/silicone rubber [J]. | JOURNAL OF APPLIED POLYMER SCIENCE , 2023 , 141 (12) . |
| MLA | Zhang, Tianfeng et al. "Mechanistic insights into the thermal-mechanical aging of the interface of cross-linked polyethylene/silicone rubber" . | JOURNAL OF APPLIED POLYMER SCIENCE 141 . 12 (2023) . |
| APA | Zhang, Tianfeng , Zhang, Yunxiao , Zheng, Xin , Lin, Wenxin , Zhang, Zenghui , Chi, Zhengnan et al. Mechanistic insights into the thermal-mechanical aging of the interface of cross-linked polyethylene/silicone rubber . | JOURNAL OF APPLIED POLYMER SCIENCE , 2023 , 141 (12) . |
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Power cables are widely used in various fields of power transmission, and cable accessories are the weakest link in power cable systems due to their complex structure and multi-layer insulation coordination issues. This paper investigates the changes in electrical properties of the silicone rubber/cross-linked polyethylene (SiR/XLPE) interface at high temperatures. The physicochemical properties of XLPE material under thermal effects with different times are characterized through FTIR, DSC, and SEM tests. Finally, the mechanism of the effects of the interface state on the electrical properties of the SiR/XLPE interface is analyzed. It is found that with the increase in temperature, the changes in electrical performance of the interface do not show a monotonic downward trend, while interestingly, they can be divided into three stages. Under the thermal effects for 40 d, the internal recrystallization of XLPE in the early stage improves the electrical properties of the interface. In the later stage of thermal effects, the amorphous region inside the material is severely damaged and the molecular chains are severely broken, resulting in a decrease in the electrical properties of the interface. The results above provide a theoretical basis for the interface design of cable accessories at high temperatures.
Keyword ：
cable accessory cable accessory cross-linked polyethylene cross-linked polyethylene electrical properties electrical properties interface interface silicone rubber silicone rubber
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| GB/T 7714 | Wu, Kai , Zhang, Tianfeng , Lin, Wenxin et al. Electrical Resistance Performance of Cable Accessory Interface Considering Thermal Effects [J]. | MATERIALS , 2023 , 16 (11) . |
| MLA | Wu, Kai et al. "Electrical Resistance Performance of Cable Accessory Interface Considering Thermal Effects" . | MATERIALS 16 . 11 (2023) . |
| APA | Wu, Kai , Zhang, Tianfeng , Lin, Wenxin , Wu, Shaolei , Feng, Yu , Zuo, Xiangyu et al. Electrical Resistance Performance of Cable Accessory Interface Considering Thermal Effects . | MATERIALS , 2023 , 16 (11) . |
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Improving the electrical treeing resistance of polymer is of great significance for insulation reliability. To achieve this, a solution-based method is employed to introduce a voltage stabilizer with high electron affinity into the silicone rubber (SiR). Experimental findings demonstrate the voltage stabilizer's ability to improve the tree initiation voltage and provide evidence of their migration within the SiR. Additionally, by combining a finite element method, it has been confirmed that voltage stabilizers can migrate through dielectrophoresis in non-uniform electric fields and adaptively reposition themselves in response to changes in electric field distribution during the growth of the electrical tree.
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| GB/T 7714 | Zhu, Xiaoqian , Li, Yuhang , Zhou, Yuanxiang et al. Improvement of the electrical treeing resistance of polymers through the self-arrangement effect of the voltage stabilizer caused by dielectrophoresis under non-uniform electric field [J]. | APPLIED PHYSICS LETTERS , 2023 , 123 (10) . |
| MLA | Zhu, Xiaoqian et al. "Improvement of the electrical treeing resistance of polymers through the self-arrangement effect of the voltage stabilizer caused by dielectrophoresis under non-uniform electric field" . | APPLIED PHYSICS LETTERS 123 . 10 (2023) . |
| APA | Zhu, Xiaoqian , Li, Yuhang , Zhou, Yuanxiang , Zhang, Yunxiao , Liu, Xuanhao , Chen, Ming . Improvement of the electrical treeing resistance of polymers through the self-arrangement effect of the voltage stabilizer caused by dielectrophoresis under non-uniform electric field . | APPLIED PHYSICS LETTERS , 2023 , 123 (10) . |
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With the advancement of power electronics, power electronic devices need to bear the operating conditions of pulse width modulation (PWM) voltage with higher frequencies, higher amplitudes, and steeper pulse rising edges. Epoxy resin is extensively applied to packaging insulation materials due to its significant performance. However, its insulation performance under different pulse parameters of higher-frequency PWM waves still needs further research. This article compares and investigates the effect of different pulse rise times on the electrical tree growth characteristics of epoxy resin under the action of low-frequency and high-frequency PWM waves. Research has found that high frequency can promote the growth of electrical tree. Under the action of a unipolar square wave with an amplitude of 12 kV at room temperature, the growth rate of the epoxy resin electrical tree significantly increases when the frequency rises from 400 Hz to 10 kHz. At high frequency, both the horizontal and vertical growth rates of the electrical tree exhibit a nonlinear growing trend. Meanwhile, the pulse rise time has a significant impact on the morphology of the electrical tree. At low and high frequencies, there is a significant difference in the morphology of the electrical tree of epoxy resin as the pulse rise time increases. However, overall, the width of the electrical tree channel decreases bit by bit, and the color of the channel becomes lighter. © 2023 IEEE.
Keyword ：
Electric power systems Electric power systems Epoxy resins Epoxy resins Morphology Morphology Packaging materials Packaging materials Pulse width modulation Pulse width modulation
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| GB/T 7714 | Lin, Wenxin , Zhang, Yunxiao , Chi, Zhengnan et al. The Effect of Pulse Rising Edge on the Electrical Tree Growth Characteristics of Epoxy Resin at High-Frequency Square Wave [C] . 2023 : 6-10 . |
| MLA | Lin, Wenxin et al. "The Effect of Pulse Rising Edge on the Electrical Tree Growth Characteristics of Epoxy Resin at High-Frequency Square Wave" . (2023) : 6-10 . |
| APA | Lin, Wenxin , Zhang, Yunxiao , Chi, Zhengnan , Zhang, Zenghui , Zhang, Tianfeng , Zhang, Jiarui . The Effect of Pulse Rising Edge on the Electrical Tree Growth Characteristics of Epoxy Resin at High-Frequency Square Wave . (2023) : 6-10 . |
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Due to the issues of multi-layer insulation coordination, the interface of cable accessories is prone to surface discharge and breakdown, which are the weakest link in the power cable system. The discharge model of composite dielectric interface is established. This article investigates the variation of breakdown voltage at the interface of XLPE/SiR double-layer dielectric under different interfacial roughness and pressures. The results indicate that the higher the interfacial roughness, the lower the interfacial breakdown voltage; the higher the interfacial pressure, the higher the interfacial breakdown voltage. In addition, considering the model, the quantitative relationships between breakdown voltage and roughness and pressure are established respectively. Finally, the interfacial breakdown mechanism is explained. © 2023 IEEE.
Keyword ：
Cable sheathing Cable sheathing Electric breakdown Electric breakdown Insulation Insulation Multiphysics Multiphysics
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| GB/T 7714 | Zhang, Tianfeng , Zhang, Yunxiao , Zheng, Xin et al. Interfacial Breakdown Characteristics and Its Physical Model of Cable Accessories under Multiphysics Fields [C] . 2023 . |
| MLA | Zhang, Tianfeng et al. "Interfacial Breakdown Characteristics and Its Physical Model of Cable Accessories under Multiphysics Fields" . (2023) . |
| APA | Zhang, Tianfeng , Zhang, Yunxiao , Zheng, Xin , Lin, Wenxin , Chi, Zhengnan , Zhang, Jiarui . Interfacial Breakdown Characteristics and Its Physical Model of Cable Accessories under Multiphysics Fields . (2023) . |
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