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wcaseyharman - That sounds so familiar. We had the same exact problem on our same size Bus at another sub. Heaters were actually turned off in the summer. And it was a common practice every summer, every sub. This I believe is a contributing factor and one I am hoping to minimize. Thanks...

thread238-439155 Our company has had its share of partial discharge issues within its 15kv and 35kv meatal clad switchgear. We've had a internal bus failure with 2 weeks of cleanup and re-covering the flat conductor with Raychem tubing. Other subs have had issues with the 'Stab' connection with...

Thank you. I did get a response back from Eaton, initially their response was a partial discharge from the the mounting bolts, which I argued it wasn't and then the next day they said I need a new 'corona' ring, and at least one tab should make contact with the vertical bus to mitigate any...

We are doing maintenance on our VCP breakers and have heard some extra 'sizzling', more than normal when racking out breakers. We then opened the shutters with the breaker out of the cell, turned off the lights and were able to see partial discharge occurring on the line side of the stabs. There...

Thanks Waross. I will look into that.

Yes, we have done DGA's this year and see combustible gases rising in the 8 month time frame. I understand about shutdown, we are taking the unit offline (not our utility but an adjacent utility owns this transformer)we are scheduled to do more testing and potentially service this unit. There is...

I am looking at creating an access on a Sealed Transformer. Transformer is 2500kva rated, 24.9kv to 12.47kv. It is oil filled, approx 700 gallons. It is a special project, learning tool in hopes we find the cause for the accumulating Acetylene gas and the potential to repair locally. It is...

Thanks for the response. Min approach distance is 30" for this voltage and as per the drawing and I am at 28". Thank you for your time.

Curious on the design of a circuit breaker; with a exterior unit heater (Jug/pole heater) malfunctions and will no longer work, is it Manufacturers design to replace while HV stays energized? We have Small switchyard, no alternate feed to a small community, that has personal in charge want to...