目前地下電纜輸電系統中，所採用的電力電纜可分為充油電纜及交連PE電纜兩種，其中交連PE電纜因無預警能力，需透過定期之維護及檢測來確保電纜品質為其缺點。而充油電纜因具有油壓指示及警報功能，所以當線路被挖掘損傷或電纜漏油時，可迅速提供警報資訊，惟目前充油電纜線路之油壓監測方式仍使用指針式油壓錶，僅引出警報點並無即時之電腦化數位監視管理模式，無法充份掌握運轉中之充油電纜線路之油壓狀況，一旦發生漏油事故時無法於第一間處理，仍經由須人力到現場巡查後，方可知故障詳細訊息，影響事故排除時間。

為改善傳統指針式油壓錶無法即時透過電腦數位管理方式監測運轉中之充油電纜線路油壓狀況之缺點，本研究應用8051單晶片微處理系統研製充油電纜油壓數位化裝置，改良指針式油壓閥盤使其具備油壓數據數位化之功能，使用類比數位轉換電路將油壓感測器信號利用數位技巧對信號進行適當的補償，提高油壓監測精確度，另將油壓數據透過變電所内之末端資訊設備及區域網路系統架構思維，建立具即時資料庫連結之充油電纜監視狀態趨勢圖，在充油電纜被挖掘損傷或電纜漏油時，經由內建程式分析判斷最大油壓變化量，提供現場維護及運轉調度人員，即時掌握充油電纜線路之異常之油壓狀況，相對也提升目前油壓監視系統不完善之處。

為驗證本文研製之油壓監視系統之效能及實用性，將於北部地區之161kV峨嵋~龍松線安裝與測試，本遙測監視系統的完成將有助於維護及運轉調度人員，充掌握不同運轉電流條件下充油電纜油壓變化的情形，以獲取最佳之供電調度化資訊及提昇供電安全。

There are currently two types of the underground cables that are used for electricity transmission system – oil-filled cables and cross-linked polyethylene cables. The disadvantage of the later is that they need periodical maintenance and examination to make sure the quality being intact as it is not equipped alarming capability. Because the former is equipped with the function of oil pressure indicator and alarm, therefore, when the oil-filled cables are damaged by excavation or when the oil-leaking happens, it provides the alarming data instantly. However, the way to monitor the oil pressure on oil-filled cables relies on a dial oil pressure gauge, which only indicates position of the alarm without instant computerized digital monitoring management, and we have no precise control on the status of the oil pressure of the operating oil-filled cables. Once the oil-leaking happens, it cannot be taken care of right away and still needs to wait until maintenance staff to be there to know the exact situation and it affects the timing to correct those faults.

In order to improve on the traditional dial oil pressure gauge which is not able to monitor the operating oil pressure status of oil-filled cables through computerized digital management, we apply 8051 single-chip micro-management system to the oil pressure digitalization equipment on the oil-filled cables in this research and modify the dial oil pressure valve with function to provide the digital data of the oil pressure. We adopt the analog and digital conversion circuit to digitally compensate the measurement on signals of oil pressure sensor and leverage the accuracy of oil pressure monitoring. Also we put the oil pressure data through the remote terminal unit and local area network in our electric power substation and establish instant data base connection to the monitoring trend chart for oil filled cables. Under the circumstances that the oil filled cable is damaged by excavation or that oil-leaking happens, through analyzing the maximum change of the oil pressure with the internal program, it provides the maintenance operating staff and dispatchers on site being instantly fully aware of the unusual oil pressure status of oil-filled cables. Comparatively it improves the imperfection of the current oil pressure monitoring system.

To test the efficiency and practicality of the oil pressure monitoring system in this research, we will install and evaluate this on 161kV along the cable from E-Mei to Song-long in the northern area. We believe that after the verification on this experiment it would help the maintenance and operating staff and dispatchers fully aware of the changing of the oil filled cable pressure under different operating electric current and obtain the best power supply dispatching data and increase the reliance of the security on power supply.

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