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Wstinghouse HU Xfmr Diff Relay

Wstinghouse HU Xfmr Diff Relay

Wstinghouse HU Xfmr Diff Relay

(OP)
I guess I've been out of the field too long.

does anybody remember the Westinghouse IL for their HU relay?

old field guy

RE: Wstinghouse HU Xfmr Diff Relay

Have the papers but never tested one though.

RE: Wstinghouse HU Xfmr Diff Relay

(OP)
Thanks for the links, folks.

A friend is working on some 'legacy', i.e., "older than dirt" equipment. He was specifically asking if the Westinghourse HU had a functionality similar to the GE BDD, where one can measure unbalance current on Terminals 8 and 9 to validate the proper setup of the unit.

Neither he nor I see that functionality in the HU.

It's been quite a while since I got to play with these things. My old service 'library' has disappeared, along with a good portion of my memory of this fine equipment.

old field guy

RE: Wstinghouse HU Xfmr Diff Relay

I'm not sure if this is what you are looking for, but as an in-service test he can measure the voltage across the 'operating circuit resistor' at the top of the relay and compare it to figure 16 on page 32 IL 41-347.1S

https://library.e.abb.com/public/7609d5d6fbd3387ec...

RE: Wstinghouse HU Xfmr Diff Relay

(OP)
JG-

Yes, that will work. It's just that the GE relay has that function brought out to a couple of easily accessible terminals on the case.

old field guy

RE: Wstinghouse HU Xfmr Diff Relay

It is the big resistor at the top, so the two wired terminals should be pretty easy to clip on to.

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