Search results for query: *

I really appreciate the discussion. It has shed light on a lot of things I did not consider. The reasons for me trying to reuse use the CO and SC relays that are on the panel, is becuase I wanted to keep things consistent in the sub. We are adding a tie breaker in a ring bus, replacing a...

http://www.abb.com/product/db0003db004281/C12573E700330419C1256E7E003223E5.aspx

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...

Yes, the ring is closed and we do trip the two breakers with the lockout relay to clear the fault. But what happens if one of those breakers fail. This would be sensed by: 86 of the original failed breaker and 50 of the breaker that was asked to trip. That would indicate, after an...

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...

I just recently installed a transfer switch. This is just more information to chew on. http://ecmweb.com/mag/electric_switching_neutral_whats/index.html http://ecmweb.com/power_quality/electric_groundfault_current_problems/index.html Hope you can glean something from them.

I also forgot to mention the monetary factor. I have 2" pipe ready to go. 2.5" pipe will cost me additional time and money. That's why I was hoping the pressure boost would help me out.

I forgot to mention that piece of information. Sorry about that. The chart that I referenced listed I could get 971 scfh from a 2" pipe.

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...