- 學位論文
木柵貓空纜車電力系統雷擊事故分析
Lightning Outage Analysis of Power System of Mucha Condola
摘要
木柵貓空纜車於民國96 年7 月4 日通車，當月份兩度遭受雷擊 而破壞行控中心控制系統的安全線顯示模組。為此，本研究針對其中 的第一次雷擊事故，即落雷擊中最接近行控中心之第13 號塔柱時所 造成的事故進行模擬，模擬雷擊電流沿著安全線，流進行控中心的安 全線顯示模組之電流分佈。 建立模型架構時，選用ATP-EMTP 套裝軟體，ATP-EMTP 適用於 輸電線鐵塔以及低壓控制系統之模擬，故本研究另選用CDEGS 套裝 軟體模擬貓纜塔柱的等效電路參數，CDEGS 係利用電磁場計算方式 求得參數，再將參數輸入至ATP-EMTP，進而建構出塔柱模型，此外， 模型中尚包含安全線以及行控中心內的避雷器與安全線顯示模組之 等效電路。 模擬結果顯示：當雷擊電流高於25kA，且安全線的突波阻抗低 於11 時，則安全線顯示模組前的避雷器因無法承受其雷擊電流而 失去保護作用。據此，經過第一次雷擊事故之後，貓纜中心已經在安 全線顯示模組前另增設一套避雷器，且改善行控中心之個別接地網， 以擴大雷電流之洩放。
並列摘要
Mucha Condola has been commissioning since July 4, 2007. The safe-line module in the control center has been damaged by lightning twice in the same month. In view of this, the first time lightning event, which refers to the event due to the lightning stroked on the No.13 tower, shall be simulated in this thesis. The simulated are the distributions of lightning current along the safe-line into the safe-line module of the control center. The ATP-EMTP has been adopted to construct model, which is applicable simulating the transmission tower and the low voltage control system, but not directly applicable to simulating the towers of condola. To solve this problem, the CDEGS software has been adopted to construct the to equivalent tower circuit model required by ATP-EMTP. CDEGS uses the electromagnetic field simulation methods to find the equivalent towers model parameters. In addition, the simulated also included the lightning current through the safe-line, the arrester, and the safe-line module in the control center. The simulation results show that: Of the lightning current is above 25kA, and the surge impedance of the safe-line is below 11 , the arrester installed to protect the safe-line module shall have difficulty is withstands the lightning current, which cause the damage of safe-line model. After this lightning event, Mucha Condola center then installed another arrester to strengthen the lightning protection for the safe-line module, and also improved the ground mesh of the control center. In order to help discharging the lightning current.