I have a situation where it would be useful for me to put a CO relay in line with CTs that are currently only being used for BUS differential protection. That particular relay is an SEL 587Z. I know that in some places in our system, we have multiple relays on a single CT, although not with a...
The question says it all. I am in the process of determining whether a T1 line will be adequate for differential line relay (SEL 311L) communication. The plan is to have the relay use a fiber input to a MUX which will output to a T1 line to the other substation. Reverse on the other end...
I'm in the process of modifying a ring transmission sub with 3 lines. I am currently working on the the breaker lockout circuit. My idea is to energize the lockout of a breaker if an adjacent breaker is in Lockout(breaker failure) and is still seeing fault current. This means two failed...
Im relatively new to protective relaying and I am trying to understand existing schemes that our utility uses.
I have a bus that is feeding a transformer with a NC tie breaker on one side and what I'll call an upstream breaker on the other side of the bus. There is differential protection for...
Im a EE with a generator that consumes 987 scfh of natural gas with a minimum operating pressure of 7"WC and a max operating pressure of 13.6"WC. The regulator feeding the gas line is set at 7"WC and the equivalent run to the gen is roughly 170 ft. By looking at the tables with standard...
