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High Voltage 2024年第2期9卷 380-390页

作者： Xinyu Wang Ping Wang jianghai geng Zikang Zhang Fangcheng Lü Shuguo Gao Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense North China Electric Power UniversityBaodingChina State Grid Hebei Electric Power Research Institute ShijiazhuangChina

Transformers may suffer multiple short-circuit impacts during long-term operation,and axial instability is one of the typical types of serious accidents caused by short-circuit *** axial instability form of the winding-block structure is analysed,and the dynamic solution of the winding short-circuit electromagnetic force is obtained by estab-lishing the three-dimensional magnetic-circuit-force multi-physical field coupling simulation *** influence of strain rate on the cushion block constitutive equation is corrected,and the modified model is verified by short-circuit impact test and quasi-static *** research results show that for 110 kV 31.5 MVA transformers,the maximum electromagnetic axial resultant force of winding is 363.16 kN,and the ultimate tilt force is 1214.2 *** pre-tightening force configuration is accordingly recom-mended to range from 363.16 to 608.28 kN,which is narrowed by 18.49%compared with the static calculation method;Meanwhile,adding a logarithmic strain rate correction term to the classical constitutive equation of the cushion block can achieve a good correction of the stress-strain relationship with the coefficient of determination above 0.99,and the cushion block has a larger elastic modulus under high strain rate *** research results provide an important theoretical reference for the axial stability structure of transformers.

关键词： axial correction structure

Modification of streamer-to-leader transition model based on radial thermal expansion in the sphere-plane gap discharge at high altitude

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Plasma Science and Technology 2024年第1期26卷 42-49页

作者：耿江海林果王平丁玉剑丁杨俞华 Department of Electric Power Engineering North China Electric Power UniversityBaoding 071003People’s Republic of China China Electric Power Research Institute Beijing 100192People’s Republic of China Xinjiang Electric Power Company Research Institute Urumchi 830000People’s Republic of China Shanxi Electric Power Company Research Institute Taiyuan 030001People’s Republic of China

Historically,streamer-to-leader transition studies mainly focused on the rod-plane gap and low altitude analysis,with limited attention paid to the sphere-plane gap at high altitude *** this work,sphere-plane gap discharge tests were carried out under the gap distance of 5 m at the Qinghai Ultra High Voltage(UHV)test base at an altitude of 2200 *** experiments measured the physical parameters such as the discharge current,electric field intensity and instantaneous optical *** duration of the dark period and the critical charge of streamer-toleader transition were obtained at high *** on radial thermal expansion of the streamer stem,we established a modified streamer-to-leader transition model of the sphere-plane gap discharge at high altitude,and calculated the stem temperature,stem radii and the duration of streamer-to-leader *** with the measured duration of sphere-plane electrode discharge at an altitude of 2200 m,the error rate of the modified model was 0.94%,while the classical model was 6.97%,demonstrating the effectiveness of the modified *** the comparisons and analysis,several suggestions are proposed to improve the numerical model for further quantitative investigations of the leader inception.

关键词： streamer-to-leader transition model high altitude streamer stem convective diffusion radial thermal expansion

基于光辐射强度的日盲紫外放电检测结果一致性校准方法

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电工技术学报 2024年第13期39卷 4176-4187,4256页

作者：李泳霖黄世龙刘云鹏耿江海杨家骏新能源电力系统全国重点实验室(华北电力大学) 北京102206 华北电力大学河北省输变电设备安全防御重点实验室保定071003

随着紫外放电检测技术的广泛应用,为解决不同型号日盲紫外成像仪的检测结果缺乏一致性和可比性的问题,该文基于MODTRAN模型分析了温度、湿度、气压和检测距离等不同因素对日盲紫外波段光辐射的大气传输过程的影响特性,建立了紫外检测辐... 详细信息

随着紫外放电检测技术的广泛应用,为解决不同型号日盲紫外成像仪的检测结果缺乏一致性和可比性的问题,该文基于MODTRAN模型分析了温度、湿度、气压和检测距离等不同因素对日盲紫外波段光辐射的大气传输过程的影响特性,建立了紫外检测辐射传输模型,搭建了辐射计量一致性校准平台,提出了紫外检测结果一致性校准方法。利用该方法建立了3台不同型号紫外成像仪的检测结果一致性校准公式,可将紫外成像仪测得的光斑面积换算为检测目标产生的光辐射强度。使用3台紫外成像仪对棒-板模型电晕放电和氘灯光源进行紫外放电检测,由一致性校准公式所得检测目标的光辐射强度计算值的相对标准偏差均小于0.1,验证了一致性校准方法的普适性。

关键词：紫外放电检测辐射传输模型辐射计量一致性校准平台一致性校准方法光辐射强度

Modification Method of Lightning Shielding Angle Calculation for Transmission Lines in Mountain Areas

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高电压技术 2013年第10期39卷 2445-2451页

作者： WANG Ping LI Lin geng jianghai State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China

Shielding angle is one of the main factors influencing lightning performance of transmission lines,which always stays in the focus of the design and the evaluation of lightning protection.A formula for the improved shielding angle is proposed for evaluating the lightning performance in different *** digital elevation model(DEM) is used to obtain the micro-topography data,such as the slope gradient,slope aspect,*** following results are obtained by analyzing the influence of topography factors on the improved shielding angle:(1) improved shielding angle non-linearly increases with the increase of the slope gradient and the slope aspect,(2) improved shielding angle is more sensitive to the slope gradient than to the slope aspect,(3) the improved shielding angle in the mountain terrains is much greater than the designed shielding *** may be the reason why the designed shielding angle is limited into the rational range,while the shielding faults occur frequently.

关键词：雷电屏蔽输电线路修改方法角度计算山区防雷性能地形数据数字高程模型

Study on the influence mechanism of ambient humidity on the temperature rise of decay-like composite insulators

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High Voltage 2022年第5期7卷 916-924页

作者： Zheng Zhong Yuan Chen Yunpeng Liu Sizu Hou jianghai geng Hebei Key Laboratory of Power Transmission Equipment Security Defense North China Electric Power UniversityBaodingChina High Voltage Technology Institute North China Electric Power Research InstituteBeijingChina Hebei Key Laboratory of Power Internet of Things Technology North China Electric Power UniversityBaodingChina

At present,observing the temperature rise of composite insulators is an effective method for the detection of decay-like ***,ambient humidity will affect the temperature rise of composite insulators,which will cause problems in screening the decaylike composite ***,it is urgent to study the temperature rise principle of decay-like insulators and find out the influence mechanism of humidity on temperature *** this study,a four-electrode system is designed to measure the surface current,volume current and interface current of the decay-like short sample and the intact short sample under different *** the equivalent circuit models of short samples and the 500 kV full-size decay-like composite insulator are built to analyse the contribution rates of leakage conductance loss and polarisation loss to temperature *** results show that the contribution rates of the polarisation loss to the temperature rise of two samples are 35.8%and 23.6%in low humidity,while they are 98.3%and 64.4%in high *** the full-size decay-like composite insulator,the contribution rates of polarisation loss to its temperature rise in high or low humidity are more than 99%.In addition,the proportion of polarisation loss increases at first and then decreases with the increase of the length of the decay-like *** conclusions of this study provide a theoretical basis for further understanding the corresponding relationship between decaylike defects and temperature rise and improve the detection rate of decay-like insulators.

关键词： composite ambient humidity

Dynamic development model for long gap discharge streamer-leader system based on fractal theory

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Plasma Science and Technology 2022年第9期24卷 68-76页

作者： jianghai geng Quansheng WANG Xiaomin LIU Ping WANG Fangcheng LYU Yujian DING Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense North China Electric Power UniversityBaoding 071003People’s Republic of China China Electric Power Research Institute Beijing 100192People’s Republic of China

Establishing a long air gap discharge model considering the streamer-leader transition and randomness of the discharge path is of great signiflcance to improve the accuracy of discharge characteristic prediction and optimize external insulation *** on fractal theory and thermal ionization theory of streamer-leader transition,this work establishes a dynamic development model for the long air gap discharge streamer-leader system,which includes streamer inception,streamer development,leader inception,development of streamer-leader system and flnal *** positive discharge process of a 3 m rod plate is simulated to obtain the fractal distribution of the discharge path and the law of leader development for comparison with the discharge test *** results show that the simulation model is similar to test results in the development characteristics of leader path distribution,each stage time and leader ***,a simulation calculation of a 50%breakdown voltage of the rod-plate gap and ball-plate gap is carried out,with results fairly consistent with test data,proving the effectiveness and practicality of the model.

关键词： long air gap fractal theory thermal ionization streamer-leader system simulation model

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新工科背景下VR在高压教学中的应用

实验科学与技术 2024年第3期22卷 112-117页

作者：耿江海林果范晓舟梁海峰刘云鹏张航华北电力大学电力工程系保定071003

实验教学的升级创新对新工科人才培养至关重要。该文针对传统高压实验危险系数较高、操作流程复杂的作业特点,提出将虚拟现实技术VR融合于高电压实验课程教学中,以高压开关柜局部放电多参量测试虚拟实验和变压器绕组变形测试虚拟实验为... 详细信息

实验教学的升级创新对新工科人才培养至关重要。该文针对传统高压实验危险系数较高、操作流程复杂的作业特点,提出将虚拟现实技术VR融合于高电压实验课程教学中,以高压开关柜局部放电多参量测试虚拟实验和变压器绕组变形测试虚拟实验为例,进行了三维场景建模,在Visual Studio中编程实现实验的交互性,搭建虚拟实验平台,开展了基于虚拟现实技术的新型高压实验教学。实践证明,有趣的VR实验方式能够充分保证实验安全性、提高实验室资源利用率、调动学生学习积极性,满足新工科背景下高电压与绝缘技术专业类专业人才培养工程训练要求。

关键词：新工科 VR技术高电压实验工程训练人才培养

海拔2500 m地区±800 k V特高压阀厅空气间隙操作冲击放电特性

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电力电容器与无功补偿 2024年第3期45卷 88-97页

作者：马旭东包正红耿江海张成磊李渊丁玉剑蒋玲王生富国网青海省电力公司电力科学研究院西宁810008 青海省高海拔电力研究重点实验室西宁810000 华北电力大学河北保定071003 中国电力科学研究院有限公司北京100192

为准确获得2 500 m海拔以上的±800 kV特高压直流工程送端阀厅的内部设计尺寸(汉语是半句话,用句号不太合适,请作者检查)。本文在2 500 m海拔的西宁高海拔试验基地,采用升降法开展了相间和相对地间隙的放电特性试验,得到了典型间隙的操... 详细信息

为准确获得2 500 m海拔以上的±800 kV特高压直流工程送端阀厅的内部设计尺寸(汉语是半句话,用句号不太合适,请作者检查)。本文在2 500 m海拔的西宁高海拔试验基地,采用升降法开展了相间和相对地间隙的放电特性试验,得到了典型间隙的操作冲击放电电压U50,并给出了放电电压与间隙距离的拟合公式。试验结果表明:空气间隙类型决定其放电特性曲线的增长率的不同,电极上均压球电极曲率半径的增大可以显著提高间隙的操作耐受能力,而针对同一种空气间隙来说,正向操作冲击电压施加的电极部位不同会直接导致放电特性曲线的不同。

关键词：特高压直流阀厅典型空气间隙操作冲击放电试验

高海拔沙尘条件下750kV输电线路导线电晕损失特性（英文）

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中国电机工程学报 2015年第22期35卷 5924-5932页

作者：朱雷刘云鹏耿江海河北省输变电设备安全防御重点实验室(华北电力大学) 河北省保定市071003

研究高海拔沙尘条件下750 kV输电线路电晕损失特性。西北地区沙尘天气频发,沙尘颗粒存在可能会影响750 kV输电线路导线电晕损失特性。基于可移动电晕笼,针对750 kV输电线路实际使用的6分裂LGJ400-50导线展开模拟沙尘条件下导线电晕损失... 详细信息

研究高海拔沙尘条件下750 kV输电线路电晕损失特性。西北地区沙尘天气频发,沙尘颗粒存在可能会影响750 kV输电线路导线电晕损失特性。基于可移动电晕笼,针对750 kV输电线路实际使用的6分裂LGJ400-50导线展开模拟沙尘条件下导线电晕损失特性试验研究,采用光纤数字化电晕损失测量系统测量导线的电晕损失,采用紫外成像仪观察放电强度。从风速,沙尘浓度,沙尘颗粒度方面分析沙尘条件对电晕损失的影响。结果表明:沙尘条件下电晕放电增强;在文中的风速范围内,风速对导线交流电晕损失影响较小;在文中的沙尘浓度和颗粒度范围内,750 kV输电线路导线电晕损失随着沙尘浓度及沙粒颗粒度的增加而增大。

关键词：沙尘条件 750 kV分裂导线电晕损失放电强度风速沙尘浓度沙尘颗粒度

高压复合绝缘子用GFRP材料吸湿特性及湿应力分布数值模拟

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电工技术学报 2022年第4期37卷 1010-1019页

作者：侯思祖钟正刘云鹏耿江海华北电力大学河北省电力网联网技术重点实验室保定071003 保定毅格通信自动化有限公司保定071003 华北电力大学河北省输变电安全防御重点实验室保定071003

在我国南方长期高温高湿环境下,外界水分逐渐侵入复合绝缘子芯棒内部,会造成芯棒酥朽劣化甚至会使整支绝缘子断裂,因此准确模拟及分析水分入侵过程对于解决此类问题至关重要。该文仿真计算外界环境温度分别为10℃、20℃和30℃,相对湿度... 详细信息

在我国南方长期高温高湿环境下,外界水分逐渐侵入复合绝缘子芯棒内部,会造成芯棒酥朽劣化甚至会使整支绝缘子断裂,因此准确模拟及分析水分入侵过程对于解决此类问题至关重要。该文仿真计算外界环境温度分别为10℃、20℃和30℃,相对湿度为90%下高压复合绝缘子用玻璃纤维增强环氧树脂(GFRP)材料的瞬态吸湿扩散过程及材料内部的湿应力变化情况。结果显示,水分在GFRP材料内部的扩散过程满足Fick定律,且吸湿扩散率和饱和吸湿率均随环境温度的升高而有所增大;在GFRP材料内部纤维分布密集处和纤维-基体界面处存在较大的湿应力和湿失配应力,且其与吸湿量正相关。当饱和吸湿率在0.008%~0.4%时,材料内部最大湿应力可达到48.07~66.06MPa。进一步研究分析得出,材料内部吸湿和脱湿周期性循环且湿应力水平较高的情况下,易产生微裂纹、微孔洞、纤维-基体界面脱粘开裂等缺陷,并进一步促进材料的吸湿。该文将计算值与已有文献中的试验值进行比较,相对误差在±5%以内,验证了模型的合理性和计算结果的正确性。研究结论对揭示复合绝缘子芯棒酥朽断裂机理、提高复合绝缘子使用寿命具有重要的参考价值。

关键词：复合绝缘子芯棒 GFRP材料吸湿湿应力酥朽断裂数值模拟