When a power transformer’s insulation system is overstressed –by thermal and/or electrical stresses – the oil and paper within the insulation undergo chemical degradation producing hydro-carbon gases as well as moisture that dissolve into the insulating oil. This over-stressing increasing the ageing process for the transformer, shortening its life, impacting its reliability, and – in some cases – can lead to a catastrophic failure.
Dissolved Gas Analysis (DGA) is the process of sampling and analysing the insulating oil to detect gases that can indicate the existence of a fault. The rate of change in these gas levels can then be used to determine pending or occurring faults, analyse the severity of these faults, and help prevent unplanned transformer outages.
CSE Uniserve partners with GE Kelman to offer portable “in field” multi-gas DGA units that offer high-quality examination and analysis of electrical transformer oil contaminants and provide results in around 25 minutes. Maintenance teams can directly see the issue and make informed decisions on the steps required.
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