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Recent content by wesles24

  1. wesles24

    Power Quality Issues

    I meant to say that that everything was fine until a new substation was brought online. The transformer has a delta-wye connection. I am working on getting more details and will update as soon as I have what you all are asking for. I do appreciate all the feedback, I agree that we should backup...
  2. wesles24

    Power Quality Issues

    Waross: I will have to talk to some people on that one, but the voltage was not an issue I know and we do not want to shut the oil sites down. if we were to do an active filter, it should be placed parallel to the source of the problem correct (as close as possible to the oil pumps?) there has...
  3. wesles24

    Power Quality Issues

    I am with a utility, while the washer was under load, it was checked with a Fluke 87 meter to check for min/max voltage deflection, there was less than 1/2 volt. Also, no stray voltage found. Hz is steady at 60 Hz, but other tests/oscope checks ran to show that the 3rd harmonic presence is very...
  4. wesles24

    Power Quality Issues

    Hello, I am trying to understand how harmonics from a few new oil wells with large variable speed motors can cause a few residential washers to stop working. They worked fine until a new substation with a delta wye transformer was recently energized. This substation serves the oil wells as well...
  5. wesles24

    Power Quality

    The IEEE and ANSI standards were helpful, but can anyone tell me for the ANSI Standard why a minimum voltage is listed for the 46kV, 115kV, and 230kV voltages? The maximum is listed but not a minimum. Thanks
  6. wesles24

    Power Quality

    Does anyone know where I can find a standard on power quality? I am looking for a good ANSI or IEEE definition. So far I can just find where they talk about how outages should be infrequent and limited, and where prompt corrective action shall be taken to get this corrected. Any help will be...
  7. wesles24

    Transformer Impedance and Operating Temperature

    As in a transformer that is mounted on a trailer along with breaker/switchgear that can be used for temporary outages/construction. Thanks for the information, I am trying to understand why it would be higher for this application. Maybe because of the shorter time period it is in service?
  8. wesles24

    Transformer Impedance and Operating Temperature

    Hello, Can anyone tell me why a mobile substation transformer can operate at higher temperatures than pad mounted (up to 95°)? Can anyone tell me why a mobile substation transformer can have impedance as high as 18%? Thanks for any help!
  9. wesles24

    Touch Potential Between Substation and Customer Fence

    Thanks for all the information. What I was able to find: NESC 384 C: Bonding should be provided between all aboveground metallic supply and communications enclosures that are separated by a distance of 6 feet or less. For the purpose of this rule, pole grounds are not required to be bonded to...
  10. wesles24

    Touch Potential Between Substation and Customer Fence

    Those are all good points, we would definately burry the conductors, but are you saying a resistive surface layer such as crushed rock would have to also be extended to the fence? I guess the big question is how close can the customer fence be before anything should be done and this may be found...
  11. wesles24

    Touch Potential Between Substation and Customer Fence

    If we simply were to run a copper ground bar from the substation grounding to the customer fence along the side that faces the substation fence would this be sufficient? Thank you for all the responses.
  12. wesles24

    Touch Potential Between Substation and Customer Fence

    I understand that there can be some touch potential between a substation fence and a customer's metal fence near by, but how do you determine how close it can be before it becomes a problem? I have seen 6 Feet online. Are there any regulations for this? I know that you could connect the...
  13. wesles24

    Surge Arrester Ratings

    Wye and Grounded, sort of new to this can you shortly explain why that matters? Excuse my ignorance Thanks!
  14. wesles24

    Surge Arrester Ratings

    Hello, Need to know what surge arrester rating to apply to a 2.4kV winding on a transformer. So would the duty cycle rating be 1.38kV (2.4kV/sqrt3)well a little higher than operating voltage say 3kV or 6kV duty? And would the MCOV rating be 2.55kV or 5.1kV??? thanks, not used to lower voltages
  15. wesles24

    BIL Standards

    Great I found what I was looking for, thanks!
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