Imagine a dam bursting. Millions of gallons of water, once contained, suddenly surge through a tiny crack. That is, in essence, what happens inside a power transformer during a short circuit fault.

Whether you are sizing protective relays, selecting switchgear, or specifying a new transformer, always ask: What is the worst-case fault current, and can everything in the path survive it?

While transformers are the workhorses of the electrical grid—stepping voltage up or down with quiet efficiency—they have an Achilles' heel: the short circuit. When a fault occurs downstream (e.g., a falling tree on a line or a failed cable), the transformer is subjected to an electromagnetic force equivalent to a controlled explosion.