Posted On: Sep 24, 2020
Internal Faults : Internal faults are phase to phase fault and it causes the system component failure. Internal faults can occur due to winding failure and overheating. If the cooling system fails then it can also cause the mechanical fault. Testing and maintenance is the best way to avoid internal faults.
External fault: An external fault occurs outside the system or transformer. It does not involve hardware failure. External problems like lightning strikes can cause damage. Even if the air temperature exceeds a threshold value, it is a fault. As these things are not predictable, it can only be solved after the causing condition no longer exists. So, it is important to prepare for these kinds of situations. External faults are minor but it can lead to system failure if the problem is not resolved.
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