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Hope it's ok to drop names. We have only 3 Cooper f6 controllers in our system many older f4 f3 f3a and f5. My question is have any of you run into problems with the Cooper Form 6 controls. I have made plans to "upgrade" all of our controls to the f6. But meeting with an engineer with more years...

Excellent information in these posts. Thank you.

Just curious if anyone out there has a similar system? We are a small utility and buy our power from a larger. Two feeds, one on each end of town. 34.5kv sub transmission looped to feed 7 substations. I am looking to replace antiquated OCBs with something simple and more modern. I see many mfg...

If you are 100% sure this is a conductor issue disregard. Is it possible that your swivel is not doing its job between the bull rope/pulling cable and the grip? and your pulling rope/cable is twisting? unwinding the ACSR. Just a thought.

I wouldn't worry too much about the insulators failing on 12kV. If you have some in question it would be a good job for an apprentice to learn to change them out hot.

Lineman's and Cableman's handbook is a must read for line construction.

My experience is never try to save time by shortcutting on powerline construction. It may be a good time to have a good look at your equipment and change out questionable insulators, crossarms, conductors, etc. Build it right the first time.

I would think you could bond your grounding strap to one of the the roller bolts. Then check continuity between the gate and grid at several pionts of closure.

My reasoning is; I am sending for bids on this unit for removal in October. I cannot remove the bushings until that time as it is still in service. Oil sample is a good idea as well. I think I'm confident enough now that the windings are copper to claim it as such. Thanks.

Thanks DPC. I already have contacted GE and ran into a dead end. any contact info would be appreciated. I agree on the date but unfortunately I need to prove this.

Referring to a GE 34.5-4160 3000kva substation transformer. I cannot determine the winding material. The nameplate does not indicate. I searched into company archives.It was ordered in 1951 and installed in 1952. The prints or bid specs do not indicate. Is there any posibility that there are...