VSR to close/reclose.

[Sn00ze]

Hello everyone,

Just wondering what is everyone's experience with using a voltage sensing relay to close on a 138kV line/reclose. I don't think synch check is possible using one of this. If so, what is the approach one should take?

Is the only option to close by being the leading end?

 

[dpc]

If there are PTs on both sides of the breaker, then you can do synch check.

 

[bacon4life]

Prior to microprocessor based relays, many reclosing circuits did not additional electromechanical relays to perform sync check. If there is negligable risk of closing out of sync, using a voltage sensing relay can work to enforce a live-bus/live-line condition.

For example, we have one portion of the grid that normally has 4 lines in parallel and the line reclosing does not use sync check. However, Dispatch turns off automatic reclosing any time less than 3 lines are in service.