PT Connections to a Beckwith Relay

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iwire

iwire

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Massachusetts
Guys, I have to add some PTs to a Beckwith Relay. Here is the diagram I received, the source is 480 volt ungrounded delta.

For some reason this diagram looks odd to me?

Anyone want to comment?

d95d5cfa.jpg
 
T

tata

New member
When you are trying to Synchronize , the bus voltage or system voltage becomes VS ( Phase or P- P) , a single phase voltage is enough to synchronise & your generator becomes the other voltage.

You say the source is 480 volt ungrounded delta, is it the FUEL CELL bank?
 
J

jghrist

Senior Member
Seems odd to try using ?-N voltage on an ungrounded system for synch check. I wouldn't think you would have a stable voltage.

You would normally use a 1? VT connected ?-?. See Figure 2-2 or 5-6 in http://www.beckwithelectric.com/docs/books/M-3520-IB-09MC4_(05-09).pdf
The Alternate Phase VT Connection is needed for an ungrounded system.

How is the VT connected on the other side of the breaker (Terminals 35-40)? It should be open delta on an ungrounded system.
 
iwire

iwire

Moderator
Staff member
Location
Massachusetts
jghrist said:
Seems odd to try using ?-N voltage on an ungrounded system for synch check. I wouldn't think you would have a stable voltage.

You would normally use a 1? VT connected ?-?. See Figure 2-2 or 5-6 in http://www.beckwithelectric.com/docs/books/M-3520-IB-09MC4_(05-09).pdf
The Alternate Phase VT Connection is needed for an ungrounded system.

How is the VT connected on the other side of the breaker (Terminals 35-40)? It should be open delta on an ungrounded system.
Click to expand...

I am afraid I cannot understand some of what you are saying.

I have virtually no experience with Beckwith relays.


(BTW, thanks for the link, I am printing it out now)
 
SG-1

SG-1

Senior Member
Location
Ware Shoals, South Carolina
The wiring diagram provided should match one of the diagrams in the instruction book. I did not see any that matched, but I was scanning fast. If the customer insists upon something different, make sure you are not on the hook to re-wire like the book shows.

The Beckwith people will talk with you. We see some of their relays about every 5 years or so.

Are you programming the beast ?
 
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