Symmetrical Components for Cross-Country Fault
Symmetrical Components for Cross-Country Fault
(OP)
I am working on a paper, for one of the relay conferences, that is looking at protection of ungrounded/high impedance grounded systems for the condition where there is already one ground fault on the system and a second fault occurs elsewhere on the system.
I have calculations using SKM, that appear reasonable, but I would like to be able to include a symmetrical components analysis of the fault currents. I have many books in my library with information about LLG faults where the fault happens in one location. What I would really like to find is a reference that deals with a phase to ground in one part of the system simultaneously with a different phase to ground elsewhere in the system.
When a relay sees both faulted phases, the sequence components are quite different than when a relay sees only one of the faulted phases.
References would be greatly appreciated.
Thanks,
David Beach.
I have calculations using SKM, that appear reasonable, but I would like to be able to include a symmetrical components analysis of the fault currents. I have many books in my library with information about LLG faults where the fault happens in one location. What I would really like to find is a reference that deals with a phase to ground in one part of the system simultaneously with a different phase to ground elsewhere in the system.
When a relay sees both faulted phases, the sequence components are quite different than when a relay sees only one of the faulted phases.
References would be greatly appreciated.
Thanks,
David Beach.






RE: Symmetrical Components for Cross-Country Fault
RE: Symmetrical Components for Cross-Country Fault
Thanks for the reference though.
RE: Symmetrical Components for Cross-Country Fault
RE: Symmetrical Components for Cross-Country Fault
RE: Symmetrical Components for Cross-Country Fault
RE: Symmetrical Components for Cross-Country Fault
Thanks again to stevenal and jghrist.
mykh, I do not have a copy of Gungor, and that fault current calculator doesn't look like it would give me anymore information than what I have from SKM. I was looking to understand how & why it produced the results it did, I have the calculated fault currents, including sequence components. But, thanks anyway.
RE: Symmetrical Components for Cross-Country Fault
In Power System Protection Vol.1, (Principles and components) edited by the Electricity Training Association are a few pages that deal with cross-country earth faults. (Condition A being a single-phase-to-earth fault on phase b and condition B a similar fault, but on phase c) They refer to Edith Clarke's book Circuit analysis of a.c. power systems for more information on simultaneous fault conditions. I do not have a copy of Edith Clarke's book, but could try to scan some pages from the first mentioned book, and then send it to you if you would like it.
Another book I think that can have some info on this subject is Conrad St Pierre's Book, A Practical Guide to Short-Circuit Calculations. Unfortunately I do not have a copy at home, but I'll check when I get back to work again.
Regards
Failure seldom stops us, it is the fear for failure that stops us - Jack Lemmon
Make the best use of Eng-Tips.com
Read the Site Policies at FAQ731-376
RE: Symmetrical Components for Cross-Country Fault
RE: Symmetrical Components for Cross-Country Fault
Although mia from eng-tips, Busbar made it to the conference. He had some favorable comments on the presentation.
RE: Symmetrical Components for Cross-Country Fault
RE: Symmetrical Components for Cross-Country Fault
Congratulations
RE: Symmetrical Components for Cross-Country Fault