STANDING on a 138,000 Volt Transformer! 

Teaching is a good way for the the teacher to learn stuff. I just retired as a 41 year CATV veteran. I always learned something when I was teaching the new guys.

I gladly take the wind for these. Loving these off the cuff videos that wouldnt be happening otherwise.

Excellent explanations! I was hoping you were going to mention the Bucholz when talking about bubbles. I have never seen, ( I only get to work on old as shit :( ) bushing temp sensors connected to the C1 tap on the oil filled bushings, interesting. Only have used them for Dobling the bushings and I have heard about remote C1 tap monitors, but never saw one in person. But never heard of temps that way, nice. Looking down from the top, I see the H0 is by the H bushings and the two bushings that are tied and bonded to ground must be the delta tertiary for harmonics? They brought out two leads for testing... I assume. And can still see the X0 ground bond busbar connected. And not common to see an H0 bushing. I did work one place that was al wye-wye, but that was very confusing for most new hires when they started, since they are usually used to delta-wye. And a good question to ask new hires when showing them around the sub, how do they get the winding temp reading and not run a metal temp sensor that would short the windings???? No one has ever answered it for me yet. Answer, they use a separate oil temp probe and then around that probe they use a heater that is powered from a CT off of one of the low side bushings. When load goes up, current in CT goes up and heater around temp probe goes up. So it is a calculated type temp. Again, I only have seen old ass shit, I think there are fiber optic type winding temp sensors they use now and measure the IR from inside the windings themselves, since the fiber is non conductive. But maybe the heated oil probe is still preferred. I know one of the BIG variable resistor in the control cabinets is to calibrate the winding temp. Yeah, I am the type that has to know what everything does and how it does it. That's my entertainment. Ohh and I am sure there is a RRR too, Rapid Rise Relay (used to be called sudden pressure relay) so when the transformer does have a fault that relay picks up the sudden pressure rise and trips. Usually before the Bucholz would, if a diff didn't take it out first. Great videos, keep on going with them!

Thanks for the video it's interesting how much protection these transformers have. I guess that new transformers here in the UK would have similar systems. Voltage here are similar they are 132Kv instead of 138 and 400Kv instead of 345Kv so very similar

I recognized a neutral ground reactor the other day driving on 495 heading to Dulles access road cause of that video a walk through a sub station

The PRD is just a McMansion version of the pressure relief valve in hot water tanks!

Really fascinating, thanks!! It feels creepy and wrong to be up on top of the transformer amongst the HV bushings and conductors...

Thank you for taking the time to make this video. Very interesting

Amazing video mate.

the design looks familiar to me. XXHP Transformer.

3:30 Never knew that about the conservator tanks! On large transformers like these that have a tertiary delta reactor winding, does that winding also prevent single-phase fault current from flowing mostly on the neutral by instead distributing that fault current across the neighboring phases?

Need a big animated scare dummy owl & other fowl of prey.

Needs still more protection: bozos out there use xformers for target practice. This has got to stop!

Thanks for making the video. What is the purpose of the padmount outside the fence?

I didn't hear you mention it, but what are the clear parts on top of each phase insulator? Is that a sight glass to see the oil level is correct?

So, THANKS for all the information! However, even knowing what little I know, I didn't understand 90% of wtf you were talking about. Now, that is on me. Certainly. Do you have a video intended for Fashion Merchandising majors? I only say that as I tutored FM majors, waay back in the day, on mainframe BASIC, it was a requirement to graduate.... Personally, I could either use that type of a video, or a link in EVERY one of your video descriptions to the "High Voltage for Fashion Merchandising majors" I give full permission for the use of that title, as quoted... I'm actually NOT being a smartass, which would normally be the case. I am CRAZY interested in this stuff! It's just really difficult to put together a decent knowledge base of the terminology & technology used in the high voltage equipment business, if you didn't get trained in it. And I am NOT trained in it... I mean, you don't need to go down to describing what the cables are made of, or what the oil is for... But 1 level deeper assuming almost total ignorance of the subject of high voltage transmission , at least in a separate video, linked, would be appreciated! Oh, and go buy a dead cat for your mic. No, do NOT throw a live cat on those bird protected lines. That is NOT the dead cat I'm looking for. ( OH, did I just create a meme? ) Audio dead cats are fluffy/furry looking things, that look like, well shit, dead bits of cat, that fit over your mic. Sorry, but that's a good visual description.... One might be able to call them mic sound prophylaxis devices? to be polite.... Or, to be my normal self, dead pussy sound rubbers. I'll stop now.....

How can you shut this off when your filming and stop selling watts/losing $?

What do these things cost?

tur-bine not turbin