Hi all, it's been 35 years since I've had my PECO (utility) fire & gas training
so maybe things have changed...
Today I saw a dispatch for a fire co to cool transformers at a sub station -
not in PA but Jersey. Huh? Is there some kind of agent besides dry chemical
that could be applied? Or would they just shutdown the operation apply water
water then restart? Seems too risky to me and I thought they were trying to
avoid a shutdown. But what do I know?
It's done nearly continuously, under power... for a healthy transformer.
Nothing high psi... just a gentle mist. I've never seen it done on a
pole mounted can. We're talking substation transformers on a pad and the
bushings a ways up there.
I've seen... in extreme conditions... oil circulators tapped in through
a heat exchanger, too.
Generally, if you shut one down under heavy load conditions you'll have
other subs tripping rapidly... which is what we're trying to avoid.
I wouldn't want anybody but trained, experienced personnel anywhere near
a HV sub. The utility should be doing the cooling....
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