CT's - What should I do here

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electrofelon

electrofelon

Senior Member
Location
Cherry Valley NY, Seattle, WA
Occupation
Electrician
CT cabinet and CT's carbon dated to the Proterozoic Eon/1976. I am replacing the switchboard this is feeding, so will be doing a disconnect/reconnect. I dont really want to get into replacing this CT cab. I think I will at least replace the lugs on the CT's. A modern mounting base is only $400, If I can get SCL to move the CT's to it for free or cheap I would provide the new mounting base. Last time I needed SCL to move some metering wires it was 3k, I complained and they dropped it to 2k, but still dont want to get into that. Conductors are 750 CU which can stay the same and even be reused.
 

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What is SCL? The poco?
I would ask about it and explain how much safer the installation would be. If they give you a price to move something g tell them the liability rests on them now since you made the offer.
 
Hv&Lv said:
What is SCL? The poco?
I would ask about it and explain how much safer the installation would be. If they give you a price to move something g tell them the liability rests on them now since you made the offer.
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Yes, Seattle City Light. I have work request in for the disconnect/reconnect and also requested they look at their CT's.

I have never seen lugs bolted right to the CT's before.
 
Bar type CTs. We use them often, especially in 25kV stations.
Occasionally in secondary like that where there are lots of conductors like you have in the picture.
It’s hard to get 6-750mcm in a window type CT.
 
I see those older style CT installations fairly regularly. I haven't had any in that bad of shape yet, though.

If the customer didn't want to go for the cost of replacing the CT cabinet, I think I'd just hit those CT's right where the lugs bolt on with some emery cloth, smear some deox on it and then bolt some new lugs back on. I'll bet that connection will outlast the rest of the cabinet.
 
Cow said:
I see those older style CT installations fairly regularly. I haven't had any in that bad of shape yet, though.

If the customer didn't want to go for the cost of replacing the CT cabinet, I think I'd just hit those CT's right where the lugs bolt on with some emery cloth, smear some deox on it and then bolt some new lugs back on. I'll bet that connection will outlast the rest of the cabinet.
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Those CT's are prolly still standard size and would fit on a modern mounting base right?
 
Cow said:
If the customer didn't want to go for the cost of replacing the CT cabinet, I think I'd just hit those CT's right where the lugs bolt on with some emery cloth, smear some deox on it and then bolt some new lugs back on. I'll bet that connection will outlast the rest of the cabinet.
Click to expand...

Yeah that is what I am leaning toward. If City Light doesnt want to put new CT's in there, it is there business. Ill just clean up the surfaces and put new lugs on. Ill let y'all know what they say.
 
I've seen similar, except they were mounted to buss bars, in Indianapolis, In. A lot easier to connect six sets of wires. Georgia power puts them over the transformer stabs on the larger services. Usually don't see anything over 800 amps in a ct cabinet with them.
 
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