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Recent content by chris8410

  1. chris8410

    History of Transformer Factories.

    Prc, You have brought up an interesting topic. I worked at GE Pittsfield. It was an amazing facility. Tom Blalock's book can still be obtained. I will look into this and post later. This book is filled with interesting stories, facts and great photos related to large transformers. It is a...
  2. chris8410

    180Hz Power using Over-Speed 60Hz Generator

    David, Marke and Scotty, Thanks for the comments regarding VFD's. I will plan on contacting a reputable VFD manufacturer. Regards, Chris
  3. chris8410

    180Hz Power using Over-Speed 60Hz Generator

    Hello David, Thank you for your response. The power must be fairly clean, That is, I must have a clean waveform as well as a minimial amount of radiated noise. Therefore, a VFD may not be appropiate. My application is performing induced voltage testing on large power transformers (up yo...
  4. chris8410

    180Hz Power using Over-Speed 60Hz Generator

    Greetings. I am writing to ask the opinion on the following. I am needing a horizontal 180Hz synchronous 3-phase 750kVA generator. This frequency is not commonly available in the used equipment market, and I do not have the funds to purchase new. It has been suggested that a horizontal 60Hz...
  5. chris8410

    Power transformer calculations

    Hi Luis, A few comments regarding load loss calculations for transformers: 1. When calculating the I2R for delta windings, the current that must be used is the LEG current, not the LINE current. Leg current is used since the I2R is a function of the current that passes through the winding...
  6. chris8410

    Voltage requirement for Tan-Delta Test

    Power2020, I have conducted tan delta measurements on large generators and GSU transformers rated up to 600MVA for over 20 years. In theory, tan delta is independent of voltage. For oil-filled transformers, this is true in practice. However, on solid insulation systems, such as a generator...
  7. chris8410

    Use of Reclosers for Capacitor Bank Switching

    Hello CK, As you may be aware, capacitor bank switching can be a source of severe voltage transients. Transient (inrush) currents can be also severe. These transient voltages and currents occur primarily when a capacitor bank is energized. Voltage spikes over 2pu can be often be generated...
  8. chris8410

    Dry Breathing Air

    Waross, The industry has been using air with very low dew point for over 50 years without any issues. The air is purchased from a bottled gas vendor, typical dew points are -80F or better....bone dry. The goal of my attempt to buy an air dryer is to get away from the dependance of buying such...
  9. chris8410

    Dry Breathing Air

    Hello all, I am writing to ask advice on some equipment I want to specify and later purchase. Any and all comments would be very much appreciated. I am an electric power engineer, so this project of mine is a bit out of my league. I would like to have built for my company a portable air...
  10. chris8410

    Electrical PE Exam

    Antimayo, The IEEE Power Engineering Society is offering a PE study course in Orange County, CA. I took this course in the mid 90's. It is outstanding. The course lasts from July 14 through October 27, meeting once a week for 4 hours (Sat mornings). The focus was on Power Engineering...
  11. chris8410

    Old Engineering References

    Scotty, Greetings. Thank you very much for the book information. I purchased it on line this evening. If I can return the favor, please let me know. Regards, Chris
  12. chris8410

    Old Engineering References

    SottyUK, Thanks for offering to provide the book information. I greatly appreciate it. I have a copy of the book "Copper for Bus Bars." Very good book. And yes, I do remimber the picture of the 40,000A DC circuit breaker. Very impressive. I wonder if it was tested at the factory before...
  13. chris8410

    Old Engineering References

    ScottyUK, I am interested in knowing the title of the Metropolitian Vickers publication you mentioned. If known, would you mind sharing the title. I would like to acquire it for my collection. I too greatly appreciate the older engineering publications. Thanks in advance. Regards, Chris
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