Wstinghouse HU Xfmr Diff Relay 1

[oldfieldguy]

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

does anybody remember the Westinghouse IL for their HU relay?

old field guy

 

[davidbeach]

https://library.e.abb.com/public/6b65787c8f08cdcac1256f2700497180/41-347.12C.pdf

 

[unclebob]

Have the papers but never tested one though.

 

[JG2828]

If you give it a minute, the downloads section will appear in the middle of the page.

http://new.abb.com/medium-voltage/d.../hu-hu-1-hu-4-transformer-differential-relays

Here are some of the files available.

http://search.abb.com/library/Downl...LanguageCode=en&DocumentPartId=&Action=Launch

http://search.abb.com/library/Downl...LanguageCode=en&DocumentPartId=&Action=Launch

http://search.abb.com/library/Downl...LanguageCode=en&DocumentPartId=&Action=Launch

 

[oldfieldguy]

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

 

[JG2828]

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/7609d5d6fbd3387ec1256f27004be7f4/41-347.1S.pdf

 

[oldfieldguy]

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

 

[JG2828]

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