Utility sources sync. criteria
Utility sources sync. criteria
(OP)
Our customer is going to use a switchgear to perform a paralleling function of two separate sources. these are utility sources and there is no gen. involved.
They intend to use voltage sensors with 3% mag. tolerance and 1 deg. phase angle error.
There are no info on slip frequency data.
What are industry standards to use base line criteria of paralleling two sources?
They intend to use voltage sensors with 3% mag. tolerance and 1 deg. phase angle error.
There are no info on slip frequency data.
What are industry standards to use base line criteria of paralleling two sources?






RE: Utility sources sync. criteria
RE: Utility sources sync. criteria
RE: Utility sources sync. criteria
Another issue is the limits on closing of the breakers.
RE: Utility sources sync. criteria
would that be a transient switching study?
I agree that relay manufacturers default values would be the first step, (in this case SEL 751) however I appreciate your experince on this subject?
Thanks
RE: Utility sources sync. criteria
RE: Utility sources sync. criteria
However, we are checking for "Not" sync situation for any reason.
RE: Utility sources sync. criteria
Measure the voltage difference and the phase angle error. Use judgement and experience to decide if it is safe or desirable to parallel. If yes, close the switch. You may increase your experience at this point. Now you have the information to set the sync check relay.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Utility sources sync. criteria
I'll start with relay default values as a start point.
Thanks afor all replies
RE: Utility sources sync. criteria
RE: Utility sources sync. criteria
RE: Utility sources sync. criteria
RE: Utility sources sync. criteria
As others have said, contact the utility first. If you tie two of their systems together, you are going to mess with their system protection coordination and personnel safety.
Aside from switching transients, your utility will inform you of the regulation schemes of each source and what kinds of circulating currents your system might experience should a tap changer on one circuit step up or down.