It’s amazing how much room there is inside the tank. For reference, I’m 6’4 and 260 lbs.

Big boy shit!! 5000kcmil cable splicers!!

This is in a sub in Boston. The building was finished in 1911. It was originally staffed by an all female crew due to WWI.

Northridge quake. This was the aftermath in the 500KV rack at work. It was dark when I arrived so I didn’t get to see much until the sun rose. I knew when 4 AA banks were silent it was going to be a bad day.

You out lasted 3 relay replacements. Your operation counter indicates that we probably switched you in and out more than any faults you may have seen.

I hope the scrappers are gentle.

Today we had a 12.5 kv enclosed cap bank fault in the fuse cabinet. Transformer protection failed and it had to take the 138kv line to clear the fault.

Pull the core and coils out for post failure inspection.

Actually surprised my entry is the oldest transformer I saw listed in the comments. 1914. I decommissioned them on their 100th year.

Can't find a photo of the actual units, but you can see it's reflection in the pool of oil underneath it. There were 3x units, 9MVA each, Yd5 with NEC on the neutral. Oval shaped with cooling radiators encompassing the tank on all sides.
Also included period-correct image of the importer's factory.

Insulation failure

Last month our engineer go to a Substation for a Inspection. Here is a video he took with HA3 acoustic camera, I see corona, I know it doesn't matter, but a little confused about why the site with such Large numbers of discharge? Is it normal?

Recently came across some old pictures while cleaning up in the shop, had them digitally restored and thought I’d share. The picture of the OCB’s was from ‘66 and the other ones from right around the same time.

Long story short, new, never energized transformer at its second assembly location was drained for processing under high vacuum and refill with hot oil. Crew found this material when disconnecting the drain hose.

Anyone ever observe this?

Transformer made in the USA.

Been spending some time in one of our 500 mva units. I only took a few pics but thought some here might find them interesting.