含水量引發的絕緣強度減低，其嚴重程度影響著電力設備運轉之性能。本論文以現場量測與實驗方法，分析相關變電所內電力設備之SF6氣體含水量，並探討水分與氣體分解所造成絕緣物之劣化現象。
目前台電變電所僅提供氣體壓力異常之監視警報回路，並未針對SF6氣體之含水量超出安全限制值作監視警報回路。本文首先以現場量測的方式，分析相關變電所161 kV氣體絕緣開關設備(GIS)的斷路器氣室及其它氣室之含水量，並從中挑選345 kV SF6氣體絕緣輸電線路(GIL)、161 kV & 23 kV 斷路器(CB)、匯流排(BB)及電纜終端匣(CHD)之含水量，利用實測資料及實驗結果，探討含水量對絕緣物劣化之影響，並提出降低電力設備含水量之改善方法以供應用、運轉、維護參考。有關國外最新電力設備的SF6氣體含水量之量測方式，針對其含水量、氣體壓力、運轉溫度及絕緣強度之影響亦納入本研究進行分析與探討。
本研究除選定台灣數個變電所之345 kV SF6氣體絕緣輸電線路(GIL)作含水量實測外，同時並針對數個配電變電所161 kV GIS各區間主要氣室之含水量實測值與計算值作分析比較。藉本論文研究之分析結果，將可避免不必要的停電檢修，期能提供有價值的數據供運轉單位之維護及製造設計工程師之參考。

The moisture content of insulation materials caused insulation strength decreased which related to operating characteristics of power equipments. This thesis analyzes the Sulphur Hexafluoride (SF6) gas moisture content of power equipment by field measurement and experiment analysis in related substations, and discuss the deteriorated phenomenon of insulating spacer caused by moisture and SF6 gas decomposition.
At present, only the gas pressure alarm is provided in Taipower’s substations. Some 161 kV substations equipment were chosen for this study. By field measurement, the moisture content in the circuit breaker and associate gas compartment of the GIS were analyzed. Also, Some measurement and experiment data in 345 kV gas insulated transmission line (GIL), 161 kV& 23 kV circuit breaker, busbar, and cable sealing end gas compartments were chosen to study the influence of the moisture content to the insulation deterioration. The improvement method for minimization of the moisture content is suggested for the reference of the operation and maintenance. This study also includes the relationship among the moisture content, gas pressure, operating temperature and the insulation strength by the new moisture measurement method for the SF6 gas.
Several 345 kV extra high-voltage substations are selected to measure SF6 gas moisture content of 345 kV GIL, meanwhile and 161 kV GIS in addition, are also chosen to compare the moisture content differences between actual measured value and estimated value. The research provides valuable information for maintenance and manufacture project engineers in future designs.

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