Lowest %Z transformer

electrofelon

Senior Member
What is the lowest impedance you have ever seen in a pole or pad transformer? I dont recall seeing anything lower that 1.8%, but I am sure there are lower.
 

Iron_Ben

Senior Member
What is the lowest impedance you have ever seen in a pole or pad transformer? I dont recall seeing anything lower that 1.8%, but I am sure there are lower.
Off the top of my head, 1.7% for sure. When I would be poking around the yard looking at nameplates, the vast majority were 1.7 to 2.1 or so.
 

electrofelon

Senior Member
15-25 KVA pads and poles I have seen are 1.9-2.3. Impedance seems to go up as the transformer size goes up. This is surprisingly low for a 166. Its a submersible vault unit:
 

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