So I have a question, I am a ut 2

[Brian33508]

So I have a question,
I am a utility electrical trouble shooter and was curious as to the effect of high voltage fault current passing through a transformer. I am assuming once it passes through the core to LV side, a % of fault current has dropped but yet still readable I am also thinking the actual wave length would have changed. Which is why people experience the brown effect as fault current travels past their transformer. Any input on this would be greatly appreciated !

 

[dpc]

Through fault current creates excess heating in the windings and high mechanical forces on the windings. Voltage drop across the transformer will also be higher than normal. The current is the same on both windings when adjusted for voltage. The fault current is simply passing through the transformer.

Cheers,

Dave

 

[waross]

A fault on the high side of a distribution circuit does not pass through the majority of distribution transformers.
An exception is a grounded wye primary with either a phantom delta formed by a three legged core or a delta secondary or tertiary winding.
In situations where the delta effect presents, the delta winding will backfeed current from the healthy phase or phases into the fault.

Bill
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