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Is it recommended to replace all ceramic isolators after years of use? Ours are in service since 2007 (14 years." Are they located in a area of heavy pollution? Heavy industry, cement plant/quarry etc? Although are system is slowly changing over our transmission and distribution to...

TugboatEng Do you know of any articles, info, white papers etc ..regarding motoring decommissioned generators? Very interesting topic indeed. Grid level stuff. Increased voltage support at a grid level? or just vars? OT

Can you please explain your " back up DC system" ? Are you referencing something different then your standard station battery system for a sub? A bit confused....

That was obviously more then just burning mineral oil after the fault was isolated. That was a looooooooong fault.

How low is your oil to begin with? I assume it has a nitrogen blanket?

Is the gauge/valve located slightly above the conservator tank..or at the end of a pressure relief device? We have a few units where the pressure relief device is a 6" pipe that is mounted at an angle on top of the transformer, with an emergency glass blow out device. On top of that is a small...

125% We have many(5) 66/15kv 15MVA+ single transformer substations that feed only one industrial customer. Fuses only on high side. Never had an issue, but I will say in most every case, the transformers are oversized a bit, for the current load. Rest of our subs/switch yards are...

NYC, Chicago, Cleveland etc..Com-Ed, Con-Ed. Basically most if not all OLD cities still utilize a lot or at least some Delta.

I definitely have a Doble. That's why I am confused why they want us to do it in this manner. Just seems odd.

This is a "manned" control room?

Has anyone in this past century... applied 120v across 12kv rated individual capacitors, and measured the current? Engineer wants us to do that, in addition to checking capacitance using our Capacitance Meter. OffTap

This Delta or Wye?

Thank you. Glyptal is more of a sealant. Looking for more of a putty.

Need to temporarily repair a porcelain bushing skirt, until new is received. Over the years I have used different "epoxy style" products to accomplisj this, but all have been out of date and thrown away. Can anyone recommend a current product sold in the U.S.? Thanks

!000v for 600v transformers is the suggested megger voltage. Obviously transformers rated at a higher voltage require 5kv, 10kv and much higher.

Thank you David. That is the way I read it. But Management did not submit that in 2014?..and has not updated to include distro class vt's since.

thermionic1- Thank you. But since we fall under this category, do we not have to comply in some manner? Provide our maintenance program,,even for instrument transformers at distribution class? Standard PRC-011-0 — UVLS System Maintenance and Testing "B. Requirements R1. The Transmission Owner...

Does NERC specify performance or interval maintenance guidelines for Distribution class current and voltage transformers? I have done quite a bit of searching in the NERC documents, and can not find this. OFFTAP

Only option #2 seems to address the real issue. Completely relying on pumps or letting the sub flood to bushing height is a fools errand. Ask New Orleans about this. OT100

If only 24 years old, good DGA's prior to removing from service, and you can replace gaskets(all) by lowering oil but not exposing windings?...I would not spend the money or time to get it dried/vacuum filled. Just filter press the oil out, and back in. The juice doesn't seem worth the...