Service and Preventive Maintenance
distribution transformers involve periodic service and preventative maintenance. Dry Type transformers
require regular inspection and cleaning, including testing and repair
of all ventilation fans and torque-testing all electrical connections.
Oil Filled Transformers
(both Substation and Padmount) also
require a Digital Gas Analysis (DGA), where oil samples are drawn and
submitted to a third party testing laboratory for detection of
combustible gases which can be caused by overloads or internal arcing
that can build to a point of explosion.