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  1. piterpol

    Industry Practice for Programming/Testing Protection Relays

    A well known and expertise specialist once said: "The best IED maintenance test is not to do it". He had some good reasons in saying this assertion.
  2. piterpol

    Interesting fault video

    Negative-sequence overcurrent relays can be set much more sensitive than phase overcurrent relays.http://files.engineering.com/getfile.aspx?folder=dc203aa7-0552-4bc1-b27d-82e85d7d34d5&file=SEL_Negative-Sequence_Overcurrent_Element_Application_and_Coordination.pdf
  3. piterpol

    Teaching Phase Relations Determination using 2 pieces of paper (1 transparent) has anyone done this?

    Hope this paper helps you.http://files.engineering.com/getfile.aspx?folder=a3a89876-d679-4151-96b2-bb810e43aff5&file=Determining_the_Correct_Connection_Compensation.pdf
  4. piterpol

    Minimum Fault Current

    ¿What to do when the fault current is less than load current?, i.e. ¿how do you protect circuits under these conditions?
  5. piterpol

    Relcosing logic for 311C

    Mr. Brooke, look for the attached Application Guide for the SEL-279H reclosing relay handling 2 breakers.http://files.engineering.com/getfile.aspx?folder=9cae5380-3d1f-46c1-8643-42d2ed280196&file=SEL-279H_Application_Guide.pdf
  6. piterpol

    Double Bus Bar switch gear

    I believe figures in the Schneider Catalogue explain by themselves.
  7. piterpol

    SEL-421L vs 311C and 311L

    The SEL-311L relay has also 87L and 21P/21G single-pole tripping. Not sure but perhaps you may configure the relay for reclosing purposes as well.
  8. piterpol

    87 differential bus protection and CT Ratios

    M1337, maybe you can get extra knowledge in reading this paper.http://files.engineering.com/getfile.aspx?folder=bbef1426-fddc-4fc3-8710-b47e3d542a8a&file=SEL_Considerations_Using_High-Z-87B_or_Low-Z-87B.pdf
  9. piterpol

    Step distance relaying under double circuit faults

    MBrooke, you can find among SEL Application Guides that identified with number AG95-29, Dated on 20140611, and authored by Armando Guzman, Jeff Roberts, and Karl Zimmerman, Volume I, entitled "Applying the SEL-321 Relay to Permissive Overreaching Transfer Trip (POTT) Schemes. Read pages from 8...
  10. piterpol

    Step distance relaying under double circuit faults

    Mbrooke, do not worry about past times, worry about present, and even future, times.
  11. piterpol

    Step distance relaying under double circuit faults

    Phase and Ground Distance Relays may support communications-assisted tripping schemes. If applying this Distance Relay to Permissive Overreaching Transfer Trip (POTT) schemes with the assistance of a communications channel, the relay provides high-speed protection for faults anywhere along the...
  12. piterpol

    European Utilities

    Look at this link: https://en.wikipedia.org/wiki/Electricity_distribution_companies_by_country Regards
  13. piterpol

    Question about jobs in the power industry.

    I found this SEL paper useful for your needs. http://files.engineering.com/getfile.aspx?folder=4f4f6acc-69b4-430c-9bcd-91f5076797c6&file=SEL_Today's_Power_Engineering_Shortage_An_Alarming_Problem.pdf
  14. piterpol

    Studies on fault impedance

    We discovered high resistance faults on 400kV lines when we realized large MW consumption in comparison to MVAR.
  15. piterpol

    CB Fail Philosophy wrt to current check

    Attached you will find the paper "Breaker Failure Philosophies"http://files.engineering.com/getfile.aspx?folder=92f5f65e-0350-4d78-921c-814e2dca54e2&file=SEL_Breaker_Failure_Philosophies.pdf
  16. piterpol

    Symmetrical vs. Asymmetrical Faults - Three Phase Bolted vs Line to Ground

    djr3203 and magoo2 ¡wow! and thousand ¡wows! Now I see, after many years, that a three-phase fault will NEVER be completely symmetrical!
  17. piterpol

    To ground or not to ground a 2500 KVA, 480 volts diesel-generator

    Thanks dpc You mentioned an important point: "But the overvoltage can be controlled". ¿May I ask you how?
  18. piterpol

    To ground or not to ground a 2500 KVA, 480 volts diesel-generator

    Thank you very much for your useful replies. One more question: If this generator were high-resistance grounded, ¿would it be prone to suffer overvoltage conditions?
  19. piterpol

    To ground or not to ground a 2500 KVA, 480 volts diesel-generator

    Criterion that should be taken into account to decide what grounding method are to be used.
  20. piterpol

    Power Transformer Selection

    Dear colleagues, I appreciate your help in selecting a 3,000KVA mining power transformer regarding its winding-connections, that is, advantages and disadvantages between a delta[34.5kV]/delta[6.9kV] bank or a delta[34.5kV]/star[6.9kV] high-resistance grounded bank. Thank you.

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