Looking for check synchronizing relay
Looking for check synchronizing relay
(OP)
In the current project I have the following problem:
We make rehabilitation of 400 kV switchyard, where complete control and protection equipment is replaced. Control scheme have to be replaced following the existing philosophy - no Substation Automation System, control will be again from control board via discrepancy control switches. My problem is closing of Circuit Breakers from SCADA. SCADA commands are coming from RTU, so for closing of CB we have to provide check synchronizing. Existing scheme is based on old electromechanical check synchronizing relays, which are no more available. I am looking for advice about some not complicated (read not very expensive) relays which can be used for check synchronizing purpose. Important is to have possibility to work in any of the four possible cases: Live line-Live Bus, Dead Line-Live Bus, Live Line-Dead Bus and Dead Line-Dead Bus.
We make rehabilitation of 400 kV switchyard, where complete control and protection equipment is replaced. Control scheme have to be replaced following the existing philosophy - no Substation Automation System, control will be again from control board via discrepancy control switches. My problem is closing of Circuit Breakers from SCADA. SCADA commands are coming from RTU, so for closing of CB we have to provide check synchronizing. Existing scheme is based on old electromechanical check synchronizing relays, which are no more available. I am looking for advice about some not complicated (read not very expensive) relays which can be used for check synchronizing purpose. Important is to have possibility to work in any of the four possible cases: Live line-Live Bus, Dead Line-Live Bus, Live Line-Dead Bus and Dead Line-Dead Bus.
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It may be like this in theory and practice, but in real life it is completely different.
The favourite sentence of my army sergeant






RE: Looking for check synchronizing relay
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If we learn from our mistakes I'm getting a great education!
RE: Looking for check synchronizing relay
RE: Looking for check synchronizing relay
As Scotty saied, KAVS100 is very simple synchrocheck relays and still on the market.
Simple for setting ABB relay SPAU140C, but not so cheaper, from other hand is 400kV, it's include inputs for dead bus release too.
Or, as jghrist saied, you can used simple protective relay, VAMP, Siemens 7SJ804, or...you know
Best Regards.
Slava
RE: Looking for check synchronizing relay
As stated above, several protection relays include sync-check, and you might want to consiter this feature in the ones you buy.
I don't feel we should recommend a relay here as your choice should reflect your ability to maintain, and your relationship with the different relay manufactures (I know there are several that don't show up here).
RE: Looking for check synchronizing relay
I consider using of KAVS (I have good experience with it) but it is looking for me too expensive. I am looking for some simpler solution, as synchronizing relay for small generators (like SYNCHROMAX), but they typically have only LL-LB and DB-LL options.
In the existing solution simple electromechanical voltage relays are used (for LL-LB case) and bypass of check-synch circuit when one of the sides is dead (dispatcher should know this for sure).
Probably we will go now to KAVS or 7VE61 relay (most of relays are Siemens). But before that I am looking for some cheaper solution because the main contractor missed these relays in his offer.
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It may be like this in theory and practice, but in real life it is completely different.
The favourite sentence of my army sergeant