安装直流线路避雷器是提高直流输电线路耐雷水平、降低其闪络率的重要措施。以国网电力科学研究院研发的挂网在±500 k V宜华直流线路用复合外套带串联间隙金属氧化物避雷器为研究对象,简要探讨了该类型避雷器的主要性能,并从避雷...安装直流线路避雷器是提高直流输电线路耐雷水平、降低其闪络率的重要措施。以国网电力科学研究院研发的挂网在±500 k V宜华直流线路用复合外套带串联间隙金属氧化物避雷器为研究对象,简要探讨了该类型避雷器的主要性能,并从避雷器挂网运行后的安全风险、电晕情况、避雷器伞裙及金具锈蚀等方面进行了可靠性分析,同时重点对比研究了挂网前后该结构完整±500 k V直流线路的跳闸情况。结果分析显示:该类型避雷器在挂网运行中未发生频繁跳动情况;未发现放电电极和线路金具有明显电晕噪声;未发现避雷器对线路电场分布产生不良影响;避雷器外绝缘和电气连接部分结构完整;多雷雨季所安装避雷器的直流线路未发生雷击跳闸事故,与以往同期相比,雷击跳闸次数降为零。由此表明:该类型避雷器具有良好的电气特性和机械特性,且防雷效果显著,由此可为大规模推广应用该类型避雷器、提高直流线路的耐雷水平提供运行经验支持。展开更多
Toward solving the actual operation problems of cascade hydropower stations under hydrologic uncertainty, this paper presents the process of extraction of statistical characteristics from long-term optimal cascade ope...Toward solving the actual operation problems of cascade hydropower stations under hydrologic uncertainty, this paper presents the process of extraction of statistical characteristics from long-term optimal cascade operation, and proposes a monthly operation function algorithm for the actual operation of cascade hydropower stations through the identification, processing, and screening of available information during long-term optimal operation. Applying the operation function to the cascade hydropower stations on the Jinshajiang-Yangtze River system, the modeled long-term electric generation is shown to have high precision and provide benefits. Through comparison with optimal operation, the simulation results show that the operation function proposed retains the characteristics of optimal operation. Also, the inadequacies and attribution of the algorithm are discussed based on case study, providing decision support and reference information for research on large-scale cascade operation work.展开更多
文摘安装直流线路避雷器是提高直流输电线路耐雷水平、降低其闪络率的重要措施。以国网电力科学研究院研发的挂网在±500 k V宜华直流线路用复合外套带串联间隙金属氧化物避雷器为研究对象,简要探讨了该类型避雷器的主要性能,并从避雷器挂网运行后的安全风险、电晕情况、避雷器伞裙及金具锈蚀等方面进行了可靠性分析,同时重点对比研究了挂网前后该结构完整±500 k V直流线路的跳闸情况。结果分析显示:该类型避雷器在挂网运行中未发生频繁跳动情况;未发现放电电极和线路金具有明显电晕噪声;未发现避雷器对线路电场分布产生不良影响;避雷器外绝缘和电气连接部分结构完整;多雷雨季所安装避雷器的直流线路未发生雷击跳闸事故,与以往同期相比,雷击跳闸次数降为零。由此表明:该类型避雷器具有良好的电气特性和机械特性,且防雷效果显著,由此可为大规模推广应用该类型避雷器、提高直流线路的耐雷水平提供运行经验支持。
基金supported by the National Natural Science Foundation of China (Grant No. 40971300)the Fundamental Research Funds for the Central Universities (Grant No.10QX43)
文摘Toward solving the actual operation problems of cascade hydropower stations under hydrologic uncertainty, this paper presents the process of extraction of statistical characteristics from long-term optimal cascade operation, and proposes a monthly operation function algorithm for the actual operation of cascade hydropower stations through the identification, processing, and screening of available information during long-term optimal operation. Applying the operation function to the cascade hydropower stations on the Jinshajiang-Yangtze River system, the modeled long-term electric generation is shown to have high precision and provide benefits. Through comparison with optimal operation, the simulation results show that the operation function proposed retains the characteristics of optimal operation. Also, the inadequacies and attribution of the algorithm are discussed based on case study, providing decision support and reference information for research on large-scale cascade operation work.
