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The application of multifunction digital relays to protect medium voltage power transformers has become a common industrial practice. Industrial transformers, unlike utility transformers, frequently use neutral grounding resistors to limit ground current during faults to the 200-400 A level on medium voltage systems. This paper discusses why these types of transformers require sensitive ground differential...
Contrary to popular belief, generators can fail - not only from short circuits - but also from abnormal electrical conditions such as overexcitation, overvoltage, loss-of-field, and unbalanced currents. When subjected to these abnormal conditions, damage or complete failure of the generator can occur within seconds. In many cases, these failures can be prevented by proper generator protection
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