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Power transformer maintenance. Field Testing

Introducti**
The politic change in some companies had a great influence in maintenance and operati** works in their electric machines. Those, have seen many times a decrease in maintenance works allowing a cost decrease in a short term but generating a greater risk of use of them in a mean and l**g term. The operating c**diti**s also have changed in the sense of taking the maximum advantage of each machine making it work at the maximum possible ratings and some times above nominal values. This situati** trends to premature age the machine fleet and if those are not part of a minimum maintenance program detecting risk situati**s or load limitati**, the resultant situati** will lead in a mean time to an irregular manoeuvre field (breakdowns, forced outages, supply interrupti**s…) that today are so usual and negative to the end customer.