配电线路雷击跳闸事故主要由感应雷过电压引起,目前线路的雷电防护常采用装设线路型避雷器和保护间隙。为了评估线路防雷措施的雷电防护效果,采用H覬idalen的仿真计算模块,搭建10 k V配电线路感应雷过电压的仿真模型并仿真线路的感应雷...配电线路雷击跳闸事故主要由感应雷过电压引起,目前线路的雷电防护常采用装设线路型避雷器和保护间隙。为了评估线路防雷措施的雷电防护效果,采用H覬idalen的仿真计算模块,搭建10 k V配电线路感应雷过电压的仿真模型并仿真线路的感应雷过电压幅值及其沿线分布,确定感应雷过电压最严重时的工况条件,并仿真研究了装设避雷器及保护间隙对线路感应雷过电压防护作用以及安装密度不同时线路感应雷过电压的影响。展开更多
The bench top test is one of the most important and effective methods to evaluate the total thermal protective performance(TPP) of firefighters' protective clothing,which is greatly influenced by the air gaps entr...The bench top test is one of the most important and effective methods to evaluate the total thermal protective performance(TPP) of firefighters' protective clothing,which is greatly influenced by the air gaps entrapped.In this paper,to investigate the effect of air gap width on TPP,a new improved apparatus with two height changeable buttons to hold the thermal sensor was developed to get a series of air gap sizes from 0 mm to 40 mm.The TPP of two types of flame-resistant outer fabrics was measured with TPP test apparatus respectively.Analysis of temperature rise with each air gap width was made to determine the effects of different air gaps on protective performance.It was indicated that air gap size had great effect on TPP of fabrics in the bench top test.An air gap width above 8 mm was suggested for the thermal protective clothing design.展开更多
为保障超、特高压交流紧凑型输电线路带电作业安全、有效的开展,通过布置典型带电作业工况并进行操作冲击放电试验,对比分析了500 k V、750 k V和1 000 k V交流紧凑型线路带电作业间隙放电特性;分析了多种作业人员进入超、特高压交流紧...为保障超、特高压交流紧凑型输电线路带电作业安全、有效的开展,通过布置典型带电作业工况并进行操作冲击放电试验,对比分析了500 k V、750 k V和1 000 k V交流紧凑型线路带电作业间隙放电特性;分析了多种作业人员进入超、特高压交流紧凑型输电线路等电位的作业方式,通过试验提出采用塔上吊篮法为最优化进出等电位作业方式;研制了超、特高压交流紧凑型输电线路带电作业用保护间隙装置,推荐了相应电压等级线路的带电作业用保护间隙技术参数,并经试验验证保护间隙的安全可靠性。研究成果可为超、特高压交流紧凑型输电线路运行维护提供参考依据。展开更多
文摘配电线路雷击跳闸事故主要由感应雷过电压引起,目前线路的雷电防护常采用装设线路型避雷器和保护间隙。为了评估线路防雷措施的雷电防护效果,采用H覬idalen的仿真计算模块,搭建10 k V配电线路感应雷过电压的仿真模型并仿真线路的感应雷过电压幅值及其沿线分布,确定感应雷过电压最严重时的工况条件,并仿真研究了装设避雷器及保护间隙对线路感应雷过电压防护作用以及安装密度不同时线路感应雷过电压的影响。
基金National Natural Science Foundation of China (No. 50876019)the Research Fund for the Doctoral Program of Higher Education of China (No. 200802550009)Fundamental Research Funds for the Central Universities,China
文摘The bench top test is one of the most important and effective methods to evaluate the total thermal protective performance(TPP) of firefighters' protective clothing,which is greatly influenced by the air gaps entrapped.In this paper,to investigate the effect of air gap width on TPP,a new improved apparatus with two height changeable buttons to hold the thermal sensor was developed to get a series of air gap sizes from 0 mm to 40 mm.The TPP of two types of flame-resistant outer fabrics was measured with TPP test apparatus respectively.Analysis of temperature rise with each air gap width was made to determine the effects of different air gaps on protective performance.It was indicated that air gap size had great effect on TPP of fabrics in the bench top test.An air gap width above 8 mm was suggested for the thermal protective clothing design.
文摘为保障超、特高压交流紧凑型输电线路带电作业安全、有效的开展,通过布置典型带电作业工况并进行操作冲击放电试验,对比分析了500 k V、750 k V和1 000 k V交流紧凑型线路带电作业间隙放电特性;分析了多种作业人员进入超、特高压交流紧凑型输电线路等电位的作业方式,通过试验提出采用塔上吊篮法为最优化进出等电位作业方式;研制了超、特高压交流紧凑型输电线路带电作业用保护间隙装置,推荐了相应电压等级线路的带电作业用保护间隙技术参数,并经试验验证保护间隙的安全可靠性。研究成果可为超、特高压交流紧凑型输电线路运行维护提供参考依据。
