Substation teams commonly use portable moisture meters, portable BDV test sets for quick screening, infrared thermography tools for identifying hot spots that may correlate with oil issues, and sampling kits with sealed bottles and sampling valves. Some sites deploy online monitors for moisture and DGA, plus oil level and temperature sensors. For filtration and drying, mobile oil processing skids with vacuum dehydration and filtration are used. The exact toolbox depends on asset criticality, but the goal is fast, contamination free sampling and reliable trending of key oil health indicators.
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