DoElect

The type of protection available for a given transformer depends on the size, complexity, and revenue derived there from it. For these reasons, different protection schemes are employed for power and distribution transformers. The type of protection used should minimize the time of disconnection for faults within the transformer and reduce the risk of catastrophic failure. Any extended operation of the transformer under abnormal conditions such as faults or overloads compromises the transformer's life. This implies that the speed of isolation upon a fault is essential. Causes of Transformer Failure Transformers throughout the power system, experience different levels of through-fault currents in terms of magnitude, duration, and frequency.  Through-faults in transformers can produce physical forces that cause insulation wear and friction-induced displacement in the winding. These effects are cumulative and should be considered over the life of the transformer. Classification of Fai...