SPDT 5kV Switch?????

[tulum]

Any one know of a manual 5kV tranfer switch?

I have looked but not found any. I am considering either kirk key interlocking two disconnects, or using two breakers.

Any thoughts appreciated

Regards,
TULUM

 

[waross]

I saw a unique arrangement years ago for a reversing interlock on 13,000V. It would probably work for occasional duty as a transfer switch.
The circuit used a Magnablast, draw up breaker.
The breaker was lowered, and then wheeled out of the cubical and into the next cubical, which had the connections reversed.
A hole was cut in the between the two cubicles. A pipe coupling was welded into the hole. A smaller piece of pipe was inserted into the hole and a small plate of steel welded top each end so that it could not be removed. Before a breaker could be wheeled into a cubicle, the pipe had to be slid over into the adjoining cubical. This blocked the insertion of breakers in both cubicals simultaneously.
It was cheap, effective and foolproof. I understood that it was a factory installation, and was approved.
If your transfer events are infrequent and you can accept several minutes of transfer time while you rack out and move a breaker, you won't find anything cheaper and more dependable then a piece of 3/4" pipe and a 1" coupling.
respectfully

 

[DanDel]

There were quite a few 15kV 'selector' type switches built years ago by Westinghouse, whereby the front of the switch was the typical load-break fused switch which connected to the transformer, and the back of the same cubicle had a three-pole, double-throw switch which allowed the user to select one of two incoming lines (with the load-break switch open). I don't know if they are still available.

 

[cuky2000]

See if the enclose product work for you application:

http://www.filnor.com/html/products/medvolt.html