International. Vaisala introduced an update to its OptimusTM OPT100 DGA monitor, incorporating oxygen and nitrogen measurements in response to the increased need for constant monitoring in transformers. This update is intended to help reduce unscheduled outages and prevent operational failures.
The life span of a transformer is linked to the condition of its solid insulation, which can deteriorate due to air leaks. One way to detect these leaks is through the constant measurement of total gas pressure (TGP), which includes all gases dissolved in the transformer oil. oxygen and nitrogen predominate.
The updated model of the OPT100 DGA incorporates the study of these two elements to enhance the supervision of processes that are not always identified by conventional analyses. According to Roberto Luna, Vaisala's Sales Manager, "at Vaisala we developed our DGA monitors with the aim of tracking key parameters and automating the evaluation of the condition of transformers."
Luna noted that TGP measurement makes it easier to identify air leaks in real time, even in early stages, inside the transformer's sealed tank. This information can facilitate maintenance-related decision-making, such as oil outgassing or seal system recovery.
In previous situations, only slow leaks could be detected with oxygen sensors, as oxygen could be ingested by active oxidation processes. The ability to correlate TGP with oxygen, incorporated in this version of the OPT100, makes it possible to establish whether there is active oxygen consumption related to oxidation.
"Backed by reliable oxygen and TGP monitoring data, it is possible to compare the estimated lifespan of the transformer against the cost of investigating and repairing an air leak, or implement appropriate mitigation measures," Luna concluded.
