在特高压(ultra high voltage,UHV)架空输电线路工程中,导线弧垂的计算必须考虑耐张绝缘子串的影响。随着耐张绝缘子串的串长和串重的增大,传统的抛物线法和力矩平衡法计算导线弧垂的准确性将大大降低。为了得到考虑耐张绝缘子串的悬链...在特高压(ultra high voltage,UHV)架空输电线路工程中,导线弧垂的计算必须考虑耐张绝缘子串的影响。随着耐张绝缘子串的串长和串重的增大,传统的抛物线法和力矩平衡法计算导线弧垂的准确性将大大降低。为了得到考虑耐张绝缘子串的悬链线弧垂的计算方法,建立包含耐张绝缘子串导线弧垂的悬链线方程,该方程为精确理论方程,精确度高;并与传统的简支梁法对比分析,最后结合工程现场实测,理论计算结果与实测结果最大相差1.97%,验证了悬链线法的正确性。展开更多
The research analyzed social and economic development around Chao Lake as well as changes of water quality in Chao Lake and explored the relation- ships of local population and GDP with water chemical oxygen demand (...The research analyzed social and economic development around Chao Lake as well as changes of water quality in Chao Lake and explored the relation- ships of local population and GDP with water chemical oxygen demand (COD), total phosphorus (TP), total nitrogen (TN), chlorophyll and eutrophication index. The re- sults showed that population around Chao Lake and GDP kept growing from 2001 to 2013, and water quality was improving. In addition, correlation analysis indicated that except of water eutrophication, GDP and population showed inverse correlation with other indices, demonstrating that water quality has been effectively controlled in Chao Lake recently.展开更多
文摘在特高压(ultra high voltage,UHV)架空输电线路工程中,导线弧垂的计算必须考虑耐张绝缘子串的影响。随着耐张绝缘子串的串长和串重的增大,传统的抛物线法和力矩平衡法计算导线弧垂的准确性将大大降低。为了得到考虑耐张绝缘子串的悬链线弧垂的计算方法,建立包含耐张绝缘子串导线弧垂的悬链线方程,该方程为精确理论方程,精确度高;并与传统的简支梁法对比分析,最后结合工程现场实测,理论计算结果与实测结果最大相差1.97%,验证了悬链线法的正确性。
基金Supported by Anhui Environmental Protection Scientific Research Program(2014-004)~~
文摘The research analyzed social and economic development around Chao Lake as well as changes of water quality in Chao Lake and explored the relation- ships of local population and GDP with water chemical oxygen demand (COD), total phosphorus (TP), total nitrogen (TN), chlorophyll and eutrophication index. The re- sults showed that population around Chao Lake and GDP kept growing from 2001 to 2013, and water quality was improving. In addition, correlation analysis indicated that except of water eutrophication, GDP and population showed inverse correlation with other indices, demonstrating that water quality has been effectively controlled in Chao Lake recently.