To that project , it was simple to construct , little effect to original pole , the safety coefficient is higher , the expense is lower , reduce flap is obvious , each of testing result was satisfied the detection criterion of railway bridge and the request of increasing in speed , consequently , it is very importance to guarantee the safety and the whole increasing in speed of beijing to guangzhou line 采用雙線剛性連接加固方案,施工簡單易行,對原鋼件損傷小,安全系數(shù)高,加固費用低,減振效果明顯,各項測試結果基本滿足《鐵路橋梁檢定規(guī)范》及提速技術要求,因此對確保列車通過大橋安全及京廣線的整體提速具有十分重要的意義。
The main job of this research is : ( 1 ) analyze the operation situation of power system during faults ; pay attention to the traveling wave on the three - phase transmission line ; study the equation of voltage on three - phase transmission line with impedance capacitance coupling between phases ; contact the voltage on any point with the fault voltage , study the singularity of the voltage signal in fault point , and make it to be the base of the new fault detection method ; ( 2 ) apply the singularity detection theory based on wavelet analysis to the power system faults detection , give a complementary criterion to current fault detection criterion , study how to select the basic wavelet , how to filter noise , how to detect the singular point or fault point , and finally give a total solution . the simulations prove it to be a quick , correct and effective fault detection method 本文的主要工作有: ( 1 )分析電力系統(tǒng)在發(fā)生故障時的運行狀態(tài),尤其對三相傳輸線上的故障行波進行了分析和研究,推導了考慮相間耦合的三相傳輸線電壓方程,并將傳輸線上任一點的電壓與故障點電壓建立起聯(lián)系,得出了傳輸線上電壓信號在故障點處的奇異性,并以此作為構造新的故障檢測算法的理論基礎; ( 2 )將基于小波變換的信號奇異性檢測理論運用于電力系統(tǒng)故障檢測中,針對目前相關研究的不足,提出了電力系統(tǒng)故障檢測判據(jù)的補充判據(jù),通過對基本小波的選擇、除噪措施、信號奇異點也即故障點的檢測方法所作的分析,給出了一個可行的解決方案;仿真研究表明:這是一個快速、準確、有效的故障檢測算法。