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b) A repair log. It is an essential diagnosis register to eliminate future difficulties.
c) An inspection revision list. It is simply a listing of points that have to be revised, dates and/
or frequencies in that will be taken to effect.
Without these logs it will be very difficult that a program of preventive maintenance works,
so the inspection knowledge got will get lost quickly.
The transformer maintenance operations described in this manual should only be
carried out by competent technicians that are familiarized with the pertinent
security practices with the handling of dangerous electric equipment.
The instructions contained here are directed to this personal and not substitute
the appropriate training and the experience in safe procedures for handling this
type of product.
The maintenance procedures described in this section do not replace the client′s
maintenance practices.
In case that some protection relay has worked and alarm, it is important to investigate the
cause of the problem. It is essential to detect which relay has operated and in combination
with which protection device made it.
It must be fully investigated, any other abnormal symptom just as excessive level of audible
sound, high or low oil level, etc.
9.3 Maintenance Procedures
Being the transformer a static device, it can be subject to operation conditions that exceed
those specified as normal conditions. Depending on the duration of the same ones, a
decrease of its expectation of useful life can be generated. In this section practical
procedures are provided about of how to maintain and give service to the transformer.
User Manual 9 Transformer Maintenance Guide
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