The Routine Transformer Analysis Tests provide analysis on your transformer oil for:
Colour /Appearance- The colour/appearance to gauge if there is any sudden deterioration in the oil during the time it is being analysed for different species. Colour has also been useful in the past as a cross check of the sample identity. For example, a sudden change from dark to light colour can indicate an oil change or incorrect sample designation.
Acidity - The acidity level of transformer oil is measured to BS2000 Part1:1982 (also IP 1/74 method A). High acidities accelerate the degradation of the paper insulation and causes corrosion of the steel tanks, we would normally suggest changing the oil when the acidity approaches 0.3mgKOH/g, but expresses concern when it reaches 0.1mgKOH/g. It is believed that acidity increases exponentially with time.
The Routine Transformer analysis also covers - Odour, Sludge, Sediment and Specific Gravity
Dissolved Gas Analysis
is widely accepted as the most reliable tool for the earliest detection of incipient faults in transformers and tap selector units. Hydrocarbon (mineral-based) oils and silicones are used as insulation fluids in transformers because of their high dielectric strength, heat transfer properties and chemical stability. Under normal operating conditions very little decomposition of the dielectric fluid occurs. However, when a thermal or electrical fault develops, dielectric fluid and solid insulation will partially decompose. The low molecular weight decomposition gases include hydrogen, methane, ethane, ethane, acetylene, carbon monoxide and carbon dioxide. These fault gases are soluble in the dielectric fluid. Analysis of the quantity of each of the fault gases present in the fluid allows identification of fault processes such as corona, sparking, overheating and arcing.
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