mshields
Senior Member
- Location
- Boston, MA
I've got two substations 34.5kV to 4160V about 1500 feet away from each other. The protective relaying scheme I'd like to employ involves communications between the two. Control is 125VDC. Running between the two presently is a single 34.5kV ductbank and a series of manholes. There are plenty of spares in the duct bank. I know better than to run the control voltage through the same manhole but a colleague is challenging me that it can be done if you barrier the low voltage in the manhole.
I've seen this done with lower albeit disparate voltages in handholes where one doesn't have to crawl into the thing but I see no practical way of accomplishing this in a manhole. Has anyone ever done this? Know how to do this if feasible?
By the way, this duct bank actually has a mix of 4160 and 34.5kV. It's an existing condition. I'd have thought this a violation. I am told it is not and that I could add more of either voltage if need be. Is that true?
Thanks,
Mike
I've seen this done with lower albeit disparate voltages in handholes where one doesn't have to crawl into the thing but I see no practical way of accomplishing this in a manhole. Has anyone ever done this? Know how to do this if feasible?
By the way, this duct bank actually has a mix of 4160 and 34.5kV. It's an existing condition. I'd have thought this a violation. I am told it is not and that I could add more of either voltage if need be. Is that true?
Thanks,
Mike