definition of "weak infeed" condition
definition of "weak infeed" condition
(OP)
came across this term in basler directional overcurrent relay,
what is it, what causes it and if objectionable how do you correct it?
many thanx in advance.
what is it, what causes it and if objectionable how do you correct it?
many thanx in advance.






RE: definition of "weak infeed" condition
A system with lower than normal impedance would be called firm or solid. It has a similar precision to saying that some cars are fast and some cars are slow.
Nevertheless it is usfull in conversation to describe general system impedance.
Now in regards to Basler relays, The answer may be completely different.
David Beach is the resident relay expert. Wait for his comments.
respectfully
RE: definition of "weak infeed" condition
For example, I build power plants. The one I'm building now can deliver about 12000 amps to a fault on the 230 kV transmission line, but only when all the generators are on line.
If the generators are off, and the 230 kV line faults right at my terminal, none of my relays will trip because there will be no current flow from my generators. The relays at the other end will see 18000 amps from their substation and will trip and clear the fault. Our substation has a "weak infeed" and will not disconnect from a faulted line.
This is usually a problem for distance and directional relays so logic is added to sense this condition by looking at voltages, absence of faults elsewhere, signals form the other end and other criteria.
I hope this rudimentary explanation helps. If you don't have a generator somewhere behind you, your relays won't see current during faults.
RE: definition of "weak infeed" condition
RE: definition of "weak infeed" condition
Respectfully
RE: definition of "weak infeed" condition