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检索条件"机构=Henan Key Laboratory of Power Transmission Line Galloping Prevention and Control Technology"

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Study on the Characteristics and Mechanism of Discharge Degradation Products of Epoxy Resin Matrix in Composite Insulators Under Humid Air Environment 19th

Study on the Characteristics and Mechanism of Discharge Degr...

引用

19th Annual Conference of China Electrotechnical Society, ACCES 2024

作者： Zhiyu, Wan Dandan, Zhang Chao, Gao Ming, Lu Hui, Li Zhenbiao, Li Kexin, Shi School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Ministry of Education Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China Henan Key Laboratory of Power Transmission Line Galloping Prevention and Control Technology State Grid Henan Electric Power Research Institute Zhengzhou450052 China Henan Jiuyu EPRI Electric Power Technology Co. Ltd. Zhengzhou450052 China

ISBN: (纸本)9789819613823

The degradation of the epoxy resin matrix in the core rods of composite insulators is the primary factor leading to decay-like deterioration and fracture accidents. Partial discharge in a humid environment is a critical trigger for this phenomenon. As an organic polymer, epoxy resin is prone to degradation under discharge, producing complex degradation products that can have secondary effects on surrounding materials, further accelerating the decay-like deterioration process. To optimize the formulation and manufacturing process of composite insulator materials and mitigate or even prevent decay-like fractures, it is crucial to study the discharge degradation products and mechanisms of the epoxy resin matrix. In this study, discharge experiments were conducted on anhydride-cured bisphenol A epoxy resin used in composite insulators within a closed humid environment. Changes in chemical functional groups of solid samples before and after discharge were analyzed from the high-frequency region to the fingerprint region. The main components and relative yields of liquid and gaseous discharge products were detected, and the primary reaction mechanisms during the discharge degradation process were thoroughly investigated. Results indicate that partial discharge in humid air induces instantaneous temperature rise and radical action, leading to epoxy resin degradation, generating alcohols and hydroxyl groups, which may increase the material’s hydration capacity and surface conductivity, thereby reducing electric field uniformity. Gaseous products such as methane, acetone, ethylene, and ethyl acetate produced by discharge pyrolysis may exacerbate stress at the core rod and sheath interface, increasing the risk of interfacial damage. Liquid products like nitric acid, carboxylic acids, and acetone may accelerate glass fiber fracture and sheath swelling. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Partial discharges

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Influence of Bolt Slippage on the Wind Induced Vibration Response of transmission Tower 17th

Influence of Bolt Slippage on the Wind Induced Vibration Res...

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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Wu, Chuan Zhang, Bo Liu, Zehui Yang, Xiaohui Lv, Zhongbin Ye, Zhongfei Henan Key Laboratory of Power Transmission Line Galloping Prevention and Control Technology Zhengzhou450052 China State Grid Henan Electric Power Research Institute Zhengzhou450052 China

ISBN: (纸本)9789819904075

Based on a practical transmission tower project, the influence of bolt slippage on the wind induced vibration response of the transmission tower is studied by the finite element method. Using the structural nonlinear static and dynamic analysis program CANNY, the slip model considering the bolt slippage effect and the corresponding non-slip model are established. And the mechanic and deformation features are comprehensively compared excited by wind. The calculated results show that the period at the end of the analysis process for slip model is larger than that for un-slip model, due to the nonlinear slip deformation which can lead to the stiffness reduction of the whole structure. The bolt slippage can reduce the base shear and bending moment, while increase the structural node deformation. In addition, both the interstory shear and the overturning moment will decrease, with a maximum decrement of 17%. While the average horizontal displacement will grow up with a maximum increment of 135%. It is suggested that the force reduction and the deformation increment due to the bolt slippage be considered in the structural analysis of the transmission tower, which can be more practical. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Bolts

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The Influence of Wind Load on the Mechanical Properties of the Main Transformer Bushing End of UHV Substation 7

The Influence of Wind Load on the Mechanical Properties of t...

引用

7th IEEE International Conference on High Voltage Engineering and Application, ICHVE 2020

作者： Si, Xuezhen Wang, Jinyang Xie, Kai Tao, Yaguang Liu, Zhuli Ren, Pengliang Yang, Xiaohui Henan Key Laboratory of Power Transmission Line Galloping Prevention and Control Technology State Grid Henan Electric Power Research Institute Henan China School of Mechanical and Power Engineering Zhengzhou University Henan China

ISBN: (纸本)9781728155111

The main transformer of substation mostly works in the wild, and its bushing end is prone to deformation and fracture. This paper takes ABAQUS as the platform and a bushing end of main transformer as the research object to establish a fine finite model. And the effect of wind load on mechanical properties of the bushing end was studied by taking wind speed and direction of dangerous condition as parameters. The results show that the terminal board and the bushing terminal are the weak links of structure, with large stresses and displacements. And the end cover is warped under the compression of the bushing terminal. The research results provide a reference for the structure's design, optimization and local strengthening measure of bushing ends and substations. © 2020 IEEE.

关键词： Bushings

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The Influence of down Conductor Torsion on the Mechanical Properties of the Main Transformer End of Substation 7

The Influence of down Conductor Torsion on the Mechanical Pr...

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7th IEEE International Conference on High Voltage Engineering and Application, ICHVE 2020

作者： Xie, Kai Tao, Yaguang Wang, Jinyang Huo, Xiangyu Liu, Zhuli Henan Key Laboratory of Power Transmission Line Galloping Prevention and Control Technology State Grid Henan Electric Power Research Institute Henan China School of Mechanical and Power Engineering Zhengzhou University Henan China

ISBN: (纸本)9781728155111

Four-bundle down conductor is prone to additional torsion in the installation process of it, which may affect the safety and stability of the end of bushing. In this paper, the down conductor of the main transformer bushing is taken as the research object, and ABAQUS as the platform. A fined finite element model is established to analyze the mechanical influence of the twisting method and twisting angle of the down conductor on the end of main transformer bushing. The results suggest that the stress of the bushing terminal and the terminal board increases non-linearly with the increase of the down conductor around its centerline or overall torsion;When the torsion angle is greater than 5°, the stress of the parts increases greatly, and the torsion angle should be controlled. The results of this paper lay the foundation for further optimizing the installation method of the main transformer bushing and improving the installation accuracy during the construction installation process. © 2020 IEEE.

关键词： Torsional stress

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Analysis on the Physical and Chemical Properties of Decay-like Fracture Composite Insulator Shed 3

Analysis on the Physical and Chemical Properties of Decay-li...

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3rd International Conference on Electrical Materials and power Equipment, ICEMPE 2021

作者： Dong, Kai Zhang, Zhijin Lu, Ming Gao, Chao Jiang, Xingliang State Key Laboratory of Power Transmission Equipment System Security and New Technology Chongqing University Chongqing China Henan Key Laboratory of Power Transmission Line Galloping Prevention and Control Technology State Grid Henan Electric Power Research Institute Zhengzhou450052 China

ISBN: (纸本)9781665418409

In recent years, decay-like fracture has become the main fracture form of composite insulators, and the faults caused by it seriously threaten the safety and stability of the power system. In this paper, decay-like fracture composite insulators string on the 500kV are used as samples to determine the physical and chemical properties of their shed. Its physical properties are detected by appearance inspection, hardness, pollution test and hydrophobicity;its chemical properties are detected by nuclear magnetic resonance and Fourier transform infrared spectroscopy. The physical and chemical characteristics of the decay-like fracture shed are obtained, it is found that decay is closely related to aging and partial discharge is also an important factor leading to the decay of composite insulators. © 2021 IEEE.

关键词： Fracture

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Study on the Effect of Thermal Degradation on the Morphology Characteristics of Composite Insulator Mandrel Under Vacuum Condition 16th

Study on the Effect of Thermal Degradation on the Morphology...

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16th Annual Conference of China Electrotechnical Society, ACCES 2021

作者： Cai, Xiang Gao, Chao Zhang, Dandan Lu, Ming Peng, Junzhe Liu, Zehui Pan, Wenwu Wan, Zhiyu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China Henan Key Laboratory of Power Transmission Line Galloping Prevention and Control Technology State Grid Henan Electric Power Research Institute Zhengzhou450052 China

ISBN: (纸本)9789811918698

the extensive use of composite insulators in the power grid, some insulators have abnormal heating phenomenon, which leads to abnormal fracture of insulators, which seriously threatens the stable operation of the power grid. The composite insulator mandrel is wrapped in a sheath, so it is difficult to contact the air, so it is necessary to study the effect of thermal degradation on the composite insulator mandrel in vacuum. First of all, the vacuum test platform was built independently, and the vacuum thermal degradation experiments of 1 h and 3 h were carried out at 200–600℃ for 5 h. Then, the macro and micro morphologies of the mandrel are studied. The results show that the surface color of the thermally degraded mandrel changes gradually from light green to light yellow, dark brown, brown and black under vacuum conditions, and crack pores appear in the cross section of the mandrel. The critical temperature for crack is 300 ℃, and the critical temperature for pores is 400 ℃. In addition, thermal degradation will lead to the cracking of epoxy resin, resulting in the surface of the mandrel changing from smooth to concave-convex, resulting in a 57-fold increase in the variance of its profile height. At the same time, it will lead to the exposure of glass fiber on the surface of the mandrel, and the degree of exposure can be up to 80%. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Morphology

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Study on breakdown characteristics of combined air gap with floating conductors under positive and negative lightning impulse voltage 16

Study on breakdown characteristics of combined air gap with ...

引用

16th IET International Conference on AC and DC power transmission, ACDC 2020

作者： Shao, Tianying Mei, Hongwei Lu, Ming Gao, Chao Zhang, Shiyao Wu, Dengjin Yin, Fanghui Wang, Liming Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen518055 China Henan Key Laboratory of Power Transmission Line Galloping Prevention and Control Technology State Grid Henan Electric Power Research Institute Zhengzhou450052 China

ISBN: (纸本)9781839533914

To understand the breakdown process of combined air gap, experiments of rod-plane gap with floating conductors under positive and negative lightning impulse voltage were conducted. During the test, the diameter and position of the conductor were changed. From the experiment, the 50% sparkover probability voltages were obtained. The discharge processes and breakdown paths were recorded by the optical observation system composed of a high-speed camera and a mirror. The test results show that the floating conductor's function is strongly related to the voltage polarity. Under positive voltage, large diameter floating conductor inserted into the gap could lead to bypassing phenomenon and increase breakdown voltage. However, under negative impulse voltage, the discharge channels all pass through the floating conductor and the breakdown voltage is significantly reduced. Based on the electric field simulation, the above experimental phenomena are preliminary analysed. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Electric breakdown

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Study on the Morphology Change of Acid-Resistant Core Rods of Composite Insulators Under Acid-Heat Condition 16th

Study on the Morphology Change of Acid-Resistant Core Rods o...

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16th Annual Conference of China Electrotechnical Society, ACCES 2021

作者： Peng, Junzhe Lu, Ming Zhang, Dandan Gao, Chao Pan, Wenwu Zhang, Yupeng Cai, Xiang Wan, Zhiyu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Luoyu Road 1037 Wuhan China Henan Key Laboratory of Power Transmission Line Galloping Prevention and Control Technology State Grid Henan Electric Power Research Institute Songshan South Road 85 Zhengzhou China

ISBN: (纸本)9789811918698

The nitric acid generated by partial discharge and the temperature rise caused by heat are the main deterioration factors of the composite insulator core rod during operation. This paper considers the influence of temperature changes in the degradation test of the nitric acid corroded core rod, and carries out the acid-heat degradation test of the acid-resistant core rod with different test temperature, nitric acid concentration, and deterioration time. And through macro analysis and micro analysis methods based on SEM and CLSM, comparative analyzing the morphological differences between the intact core rod, the acid etching core rod at room temperature, the acid-heat degraded core rod and the actual decay-like core rod. The macroscopic and microscopic morphology observation results show that the glass fiber of the acid-resistant core rod after acid etching at room temperature does not appear to be significantly broken. And the acid-resistant core rod after acid-heat deterioration has a serious deterioration process of glass fiber breakage and degradation of the epoxy resin matrix. It is proved that the temperature increase will accelerate the process of nitric acid corrosion of the core rod. The comparison of morphology shows that the acid-heat deterioration core rod and the actual decay-like core rod have more consistent characteristics in the macroscopic and microscopic morphologies. The acid-heat deterioration test method can better simulate the actual aging process of the core rod, and provide a direction for explaining the decay-like fracture mechanism of composite insulators. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Nitric acid

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Dynamic Response of a Cat Head Type transmission Tower-line System under Strong Wind 7

Dynamic Response of a Cat Head Type Transmission Tower-line ...

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2021 7th International Conference on Mechanical Engineering, Materials and Automation technology, MMEAT 2021

作者： Wu, Chuan Yang, Xiaohui Zhang, Bo Liu, Zehui Zhao, Yang State Grid Henan Electric Power Research Institute State Grid Key Laboratory of Power Transmission Line Galloping Prevention and Control Technology Zhengzhou450052 China School of Advanced Manufacturing Engineering Chongqing University of Posts and Telecommunications Chongqing400065 China

transmission tower plays important role in the power system and it is security sensitive in various working conditions, such as wind and ice. In this paper, a method to obtain the dynamic response of a cat head type transmission tower under strong fluctuating wind was proposed. The coupled tower-lines finite element model was established in ABAQUS, and the equivalent acceleration of fluctuating wind was simulated by MATLAB. Then the displacements and stresses time histories were obtained. The method introduced in this paper can be used to assess the safety of tower under different fluctuating wind with different directions and provide a reference of the tower in the design stage. © Published under licence by IOP Publishing Ltd.

关键词： Towers

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A Method for Simulating Abnormal Heating Internal Interface of Composite Insulator Based on Electromagnetic Heating 3

A Method for Simulating Abnormal Heating Internal Interface ...

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3rd International Conference on Electrical Materials and power Equipment, ICEMPE 2021

作者： Li, Ziyue Gao, Chao Lu, Ming Mei, Hongwei Wu, Yansong Wang, Liming Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen China Prevention and Control Technology State Grid Henan Electric Power Research Institute Henan Key Laboratory of Power Transmission Line Galloping Zhengzhou China Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen China

ISBN: (纸本)9781665418409

Decay-like fracture is a new kind of fracture phenomena of composite insulator occurring in recent years. Abnormal temperature rise in 500kV composite insulators high-voltage end is found by the infrared temperature measurement before the decay-like fracture occurs. In order to simulate the overheat conditions and carry out artificial accelerated aging tests, an experimental method based on electromagnetic heating is put forward in the paper. A metal defect is put in the interface between silicone rubber housing and fiber reinforced plastic (FRP) core rod. The composite insulator sample is put in the high frequency magnetic field. Due to the eddy effect, the metal defect will heat. Partial internal heating in the sheath-core interface is achieved in the paper, which is the same as the abnormal overheated composite insulators online. During the experiment, the FPR core rod is heated by the defect, deteriorates, and produces a lot of gas, which cause the damage of the silicone rubber housing. After the experiment, the FPR core rod samples are analyzed by visual observation, scanning electron microscope and Fourier Transform Infrared Spectrometer. It is proved that epoxy resin matrix in the hot environment will be decomposed in the paper. © 2021 IEEE.

关键词： Scanning electron microscopy

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