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Recent content by maxljahnke

  1. maxljahnke

    Effects of transformer oil reconditioning on DGA

    Hello. One particular question has tormented me for some time now since I haven't been able to find an assertive answer to it. How does treating the transformer's oil with a vacuum dehydrator may affect the trend of your DGA, particularly regarding to furan measurements to estimate the degree...
  2. maxljahnke

    HV busbar tripping

    Of course, it wouldn't make any sense having a person looking out 24/7 on transients, I expressed myself badly. By operator I meant the energy company's relay.
  3. maxljahnke

    HV busbar tripping

    waross: I forgot to mention that I work at an old plant that has direct connection to the 69kV grid (no bays), so the grid operators cannot remotely disconnect our plant specifically, only if the entire feeder is shut down (and it has other companies connected). Your answers have been very...
  4. maxljahnke

    HV busbar tripping

    Thanks for the answers so far. I would like to ask, if possible, for you to list what would other causes for underfrequency be, considering the load is not greater than the generator's capacity. If you could suggest good books on the topic, that'd be great too. Also, consider the following...
  5. maxljahnke

    HV busbar tripping

    In a system consisting of 6 13.2/0.44kV 60Hz 1.75MVA transformers, fed from a 69/13.2kV 7.5MVA transformer, each having its own cubicle with a Schneider Sepam S40 protection relay, there was an event that tripped all 6 circuit breakers. The reason of the trip was "underfrequency". Settings are...
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