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高压开关柜故障起火自动灭火装置优化设计研究

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高压电器 2024年第1期60卷 41-47页

作者：张佳庆谢佳黄伟民过羿尚峰举贾佳王伟马国明国网安徽省电力有限公司电力科学研究院合肥230601 电力火灾与安全防护安徽省重点实验室合肥230022 国家电网公司输变电设施火灾防护实验室合肥230022 国网安徽省电力有限公司合肥230061 华北电力大学新能源电力系统国家重点实验室北京102206

近年来发生了多起高压开关柜火灾事故,传统开关柜灭火通过人工方式灭火,存在灭火效率低、人员风险大等问题。现有开关柜自动灭火装置研究存在引入电场畸变、启动阈值不清及灭火剂选择不当等问题。为解决上述问题,文中开展了高压开关柜... 详细信息

近年来发生了多起高压开关柜火灾事故,传统开关柜灭火通过人工方式灭火,存在灭火效率低、人员风险大等问题。现有开关柜自动灭火装置研究存在引入电场畸变、启动阈值不清及灭火剂选择不当等问题。为解决上述问题,文中开展了高压开关柜故障起火自动灭火系统研究。优化设计了了灭火剂喷头结构,降低了最大场强,避免了绝缘击穿风险。进行了真型开关柜火灾模拟试验,基于试验过程中温度场分布确定了灭火装置启动阈值。探索了灭火剂类型与用量,确定了合理的高压开关柜灭火剂设置方案。建立了完整的高压开关柜自动灭火系统,试验结果表明文中所提出灭火系统快速有效。

关键词：高压开关柜灭火装置电场优化启动阈值真型实验

全尺寸高压开关柜电缆绝缘故障电致燃烧试验研究及机理分析

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高压电器 2024年第3期60卷 42-49页

作者：张佳庆陈庆涛柯艳国赵恒阳尚峰举贾佳过羿马国明国网安徽省电力有限公司电力科学研究院合肥230601 电力火灾与安全防护安徽省重点实验室合肥230022 国家电网公司输变电设施火灾防护实验室合肥230022 国网安徽省电力有限公司合肥230061 华北电力大学新能源电力系统国家重点实验室北京102206

由于开关柜的封闭特性,长期以来研究人员对于开关柜内火灾发展的时空演变规律缺乏认知,对电缆放电能否引燃、如何燃烧有争议,针对性的防范措施缺乏依据。燃烧试验难度大,全尺寸试验难以开展。文中针对高压开关柜电缆单相接地短路引发火... 详细信息

由于开关柜的封闭特性,长期以来研究人员对于开关柜内火灾发展的时空演变规律缺乏认知,对电缆放电能否引燃、如何燃烧有争议,针对性的防范措施缺乏依据。燃烧试验难度大,全尺寸试验难以开展。文中针对高压开关柜电缆单相接地短路引发火灾的过程开展研究。搭建全尺寸试验平台,研究掌握了电缆短路起火过程中开关柜内外以及电缆外皮的温度分布情况。开展了多物理场仿真研究,构建了开关柜起火模型,掌握了火灾蔓延规律。基于仿真和试验结果对电缆电致燃烧过程中电缆材料分解过程及材料分解对燃烧的影响进行了分析。通过上述研究,掌握了高压开关柜电缆绝缘故障燃烧机理,掌握了电缆外皮温度可以很好的反应开关柜内部故障温度,为开关柜火灾预防奠定了基础。

关键词：燃烧模拟电缆故障数值模拟引燃机理材料热解

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基于双锥微钠光纤的GIS微水监测技术

浙江电力 2024年第5期43卷 109-115页

作者：邵先军陈孝信姜炯挺王玉昆季俊廷杜厚贤马国明国网浙江省电力有限公司电力科学研究院杭州310014 国网浙江省电力有限公司宁波供电公司浙江宁波315100 华北电力大学新能源电力系统国家重点实验室北京102206

GIS(气体绝缘封闭组合电器)内微水含量升高会降低其绝缘水平。为了实现对GIS内部绝缘气体湿度的在线监测,设计了一种基于双锥微纳光纤的GIS湿度传感器。首先采用BPM(光束传播法)对双锥微纳光纤的光场进行仿真,研究双锥微纳光纤的光场分... 详细信息

GIS(气体绝缘封闭组合电器)内微水含量升高会降低其绝缘水平。为了实现对GIS内部绝缘气体湿度的在线监测,设计了一种基于双锥微纳光纤的GIS湿度传感器。首先采用BPM(光束传播法)对双锥微纳光纤的光场进行仿真,研究双锥微纳光纤的光场分布与模式干涉理论,得到SF6气体随微水含量的变化规律;然后采用熔融拉锥法制备了双锥微纳光纤湿度传感器,并进行了湿度传感实验。最后结合实验得出结论,基于双锥微纳光纤的湿度传感器检测灵敏度为-51.75 pm/%RH,能够实现对电气设备湿度的连续在线监测。

关键词： GIS 微纳光纤湿度传感器

A low-cost and high-performance self-trigger method for high-voltage transient measurement

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High Voltage 2023年第2期8卷 412-420页

作者： Hao Liu guoming ma Weiqi Qin Wei Wang Houxian Du Lei Wang Shicong Zhai Fuping Zeng Weixing Han State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijingP.R.China China Electric Power Research Institute WuhanHubei ProvinceChina School of Electrical Engineering and Automation Wuhan UniversityWuhanChina

Stable triggering of acquisition devices is critical to accurately measure electromagnetic transients,especially for very fast transient overvoltages(VFTOs).A highly stable and lowcos t self-trigger method for transient measurement is *** integrated low-voltage arm module was developed to synchronously realise the triggering and VFTO *** trigger branch was developed using a high-pass *** component obtained the high-frequency component of the VFTO to trigger the *** trigger branch was integrated with the measurement branch through an impedance *** attenuator was implemented before the impedance converter to avoid overvoltage damage to the *** circuit parameters of the attenuator were optimised to alleviate the disturbance of the measurement *** calibration results demonstrated that the±1 dB bandwidth of the measurement branch in this system ranged from 11.8 Hz to 105 *** low cutoff frequency of the trigger branch was 710 *** VFTO waveforms generated by the operation of a disconnector in a real 252 kV gas insulated switchgear were measured using the proposed *** test results verified that the self-trigger measurement system can provide stable trigger signals and accurately measure the VFTO waveforms.

关键词： transient branch impedance

Review of flash sintering with strong electric field

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High Voltage 2022年第1期7卷 1-11页

作者： Hongyang Zhou Xiang Li Yuchen Zhu Jieming Liu Angxuan Wu guoming ma Xilin Wang Zhidong Jia Liming Wang Guangdong Engineering Technology Research Centre of Power Equipment Reliability in Complicated Coastal Environments Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhenGuangdongChina School of Electrical and Electronic Engineering North China Electric Power UniversityBeijingChina

Flash sintering is a novel field‐assisted sintering technology for ceramics that allows a dramatic reduction in processing time and *** 2010,when flash sintering was first reported,it has been a focus of research interest in the field of materials *** study results have confirmed that the sintering temperature decreases with the strength of the applied electric field;for some ceramics,the sintering temperature can be lowered even to room *** represents an innovative breakthrough for ceramic sintering at ultra‐low ***,once the electric field strength in flash sintering is increased,new questions and challenges arise,such as whether or not partial discharge occurs in the green body if under electro‐thermal coupling stress,how to quantitatively analyse the impact of discharge on sintering,and,moreover,whether the sintering mechanism under a strong electric field is consistent with that under a weak electric *** research questions require knowledge of partial discharge detection,dielectric theory,and other topics that are beyond the scope of materials *** address this need,this review summarises the work carried out in flash sintering with a strong electric field from the perspective of high voltage and insulation ***,the flash sintering process and mechanism are briefly ***,the published literature on flash sintering with a strong electric field for various ceramic materials is summarised in *** addition,experimental phenomena that are observed in flash sintering with a strong electric field,such as flash and blackening,are ***,some suggestions for future work are *** is anticipated that the knowledge gap between different areas of study can be filled by this review.

关键词： flash knowledge field

High‐performance ZnO varistor ceramics prepared by arc‐induced flash sintering with low energy consumption at room temperature

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High Voltage 2022年第2期7卷 222-232页

作者： Angxuan Wu Zhixiang Zhu Xilin Wang Nianping Yan Hongyang Zhou Rongxia Huang guoming ma Zhidong Jia Liming Wang Engineering Laboratory of Power Equipment Reliability in Complicated Coastal Environments Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhenGuangdongChina State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Co.LtdBeijingChina State Grade Jiangxi Electric Power Research Institute NanchangChina School of Electromechanical Engineering Guangdong University of TechnologyGuangzhouGuangdongChina State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijingChina

The development of ultra‐high voltage transmission lines requires a ZnO arrester with excellent electrical response and high voltage *** with conventional preparation methods,flash sintering allows fast production of novel high‐performance ZnO varistor ceramics with low energy consumption and controlled grain ***,ZnO varistor ceramics were prepared using the flash sintering method at an air pressure of 21 kPa for 60 s at 25℃.The results showed that the flash‐sintered samples had fine grains and reduced loss of volatile ***,the voltage gradient,leakage current density,and non‐linear coefficient of the flash‐sintered varistor ceramics were significantly improved compared with those of conventionally sintered *** to the short preparation time and absence of a heating process,the energy consumption of the proposed flash sintering method was significantly reduced to 10%of that by conventional *** proposed method is a promising approach for the preparation of ZnO arresters with excellent electrical properties and serves as an effective method that realises energy saving and emission reduction.

关键词： ceramics varistor preparation

禽呼肠孤病毒在我国部分地区蛋鸡群中的血清流行率和风险因素分析

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中国兽医杂志 2024年第3期60卷 1-8页

作者：郑好杨霞张素赵一萌汤君宇高丽曹红马国明王占新郑世军王永强中国农业大学动物医学院兽医公共卫生安全全国重点实验室农业农村部动物流行病学重点实验室北京海淀100193 北农大科技股份有限公司北京海淀100193 温氏食品集团股份有限公司广东省畜禽健康养殖与环境控制企业重点实验室广东云浮527300

禽呼肠孤病毒(ARV)在我国流行范围较广,感染家禽后使其出现病毒性关节炎、生长不良和产蛋量下降等表现,对我国养禽业造成较严重的经济损失。为了解我国蛋鸡群中ARV的流行情况及存在的感染风险因素,本试验在2022年11月—2023年3月从北京... 详细信息

禽呼肠孤病毒(ARV)在我国流行范围较广,感染家禽后使其出现病毒性关节炎、生长不良和产蛋量下降等表现,对我国养禽业造成较严重的经济损失。为了解我国蛋鸡群中ARV的流行情况及存在的感染风险因素,本试验在2022年11月—2023年3月从北京、天津、河北、山东、河南、江苏、陕西、湖北和重庆9个省市的45个蛋鸡养殖场(其中包括祖代蛋鸡群、父母代蛋鸡群和商品代蛋鸡群),收集共计45份调查问卷和968份血清样本。采用酶联免疫吸附试验(ELISA)检测血清中的ARV抗体,并结合调查问卷,采用单因素分析和逻辑回归分析方法找到蛋鸡出现ARV感染症状的风险因素。ELISA检测结果显示,968份血清样本中检出阳性863份,阳性率为89.15%(95%CI:87.0%~91.0%);单因素分析结果显示,全进全出饲养模式下的蛋鸡出现ARV感染症状的概率显著低于区域性全进全出饲养模式或不同日龄、不同批次混养饲养模式下的蛋鸡,且具有较强程度的关联(P<0.05,0.1

关键词：蛋鸡禽呼肠孤病毒(ARV) 抗体检测风险因素

Review of Charge Accumulation on Spacers of Gas Insulated Equipment at DC Stress

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CSEE Journal of Power and Energy Systems 2020年第3期6卷 496-517页

作者： Hongyang Zhou guoming ma Cong Wang Jue Wang Guixin Zhang Youping Tu Chengrong Li State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources and the Beijing Key Laboratory of High Voltage and EMC North China Electric Power UniversityBeijing 102206China Institute of Electrical Engineering Chinese Academy of SciencesBeijingChina Department of Electrical Engineering Tsinghua UniversityBeijing 100084China

Charge accumulation on the spacer surface in gas insulated equipment is very severe in the DC field,leading to easy flashover,which restricts the application of DC GIS/***,knowledge about the charge accumulation characteristics of gas insulated equipment at DC stress is *** this paper,we reviewed the research methods and the characteristics of charge accumulation on spacers.A summary of charge measurement methods and setups are *** the surface charge inversion algorithms are *** the simulation model for charge accumulation in the DC field is ***,the charge accumulation mechanisms and phenomenon,the influence factor of surface charge accumulation and the influence of accumulated charge on spacer insulation characteristics are *** addition,some suppression methods of surface charge accumulation are ***,based on the understanding of charge accumulation on spacers,some suggestions on further studies are presented to aid in the design of a better spacer free from surface charges.

关键词： Charge accumulation DC gas insulated equipment review spacer

Optical sensors for power transformer monitoring:A review

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High Voltage 2021年第3期6卷 367-386页

作者： guoming ma Yuan Wang Weiqi Qin Hongyang Zhou Chao Yan Jun Jiang Yiguang Ju State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijingP.R.China Department of Mechanical and Aerospace Engineering Princeton UniversityPrincetonNew JerseyUSA Center for More‐Electric‐Aircraft Power System Nanjing University of Aeronautics and AstronauticsNanjingP.R.China

Power transformers play a vital role in power transmission systems from the energy source to the consumption *** situ diagnostics of the performance of power transformers provides a variety of benefits to ensure reliable electricity *** to electromagnetic interference,high sensitivity,high insulation as well as small dimensions of optical sensing make it very attractive for applications in power transformer *** paper presents a critical review of various diagnostic methods for power transformers such as partial discharge,dissolved gases,temperature and other important sensing,and optical *** advantages and disadvantages of different monitoring methods are carefully discussed and ***,the existing technical barriers and future prospects of optical monitoring methods for power transformers are presented.

关键词： attractive insulation dimensions