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  1. umrpwr

    Data Center in close proximity to a 115KV Substation

    The short answer to your initial question is as far I aware there are no standards or recommended guidelines for the minimum distance for separation between a data center and substation. It seems that you have raised a couple of issues in your post though. The first question being whether the...
  2. umrpwr

    What are good references for a Power Engineer?

    One other item although not complete the IEEE Color books are in tbe process of still being updated. The update and revision once completed will be called the IEEE 3000 Series Standards. IEEE 3000 Standards Collection™—Coming Soon (formerly IEEE Colorbooks® PowerPack) The IEEE 3000 Standards...
  3. umrpwr

    What are good references for a Power Engineer?

    David, There are a few that come to mind that should be added to your original list but which I don't see yet. This first one below was from one of my replies to another post in which you mentioned your were going to add it to the list, but which I don't believe has been so I will include it...
  4. umrpwr

    Articles/ Books about troubleshooting of electrical machines?

    One of the old industry bibles for motor repair and troubleshooting has been Electric Motor Repair by Robert Rosenburg and August Hand. It is not an engineering book with lots of formulas, but it is one of the most practical books on motor operation and repair you will find. It is available on...
  5. umrpwr

    Why AC Power Distribution in Data Centers

    Currently working for a company that specializes in data center design we looked at using DC distribution several times in the past and proposed it for use on different projects, but it has never been accepteded for any of the projects I have worked on. There is still some debate about the...
  6. umrpwr

    Power receptacle orientation, ground prong up?

    There are no code requirements which specify the direction that the ground prong and hot or neutral need to be oriented. I would agree with David that if the device is listed and manufacturer instructions indicate which direction it needs to installed then you need to follow that. I am not aware...
  7. umrpwr

    WinIGS - grounding software

    I have used it before for grounding studies. The software is powerful and has a lot of capabilities but is not the most intuitive when it comes to the user interface compared to some other programs. If you are also using the Smart Ground Meter for measurements that data also integrates into the...
  8. umrpwr

    KVA Method Vs. Per-Unit Method

    David, The kVA or MVA method is just a simplified method for performing short-circut calculations by being able to add the equipment ratings in kVA or MVA in order to be able to calculate the equivalent short-circuit current. Nothing that great about it. I think one of the first papers was...
  9. umrpwr

    Jiffy?

    steveal Below is a link to a little more scientific site at the University of North Carolina-Chapel Hill which has definitions for units of measure. It gives some insight as to where the unit may have come from. www.unc.edu/~rowlett/units/dictJ.html
  10. umrpwr

    Generator Protection

    I would highly recommend the book Protective Relaying for Power Generation Systems by Donald Reimert. This book goes into great detail on protection for generators more than some of the other protective relaying texts like Blackburn (even though that is still a classic). Below is a link...
  11. umrpwr

    Looking for calculation information

    Unfortunately you can't avoid the math if you want to understand electromagnetics. I would strongly recommend the following book though. "A Student's Guide to Maxwell's Equations" it one of the best books on the subject and will help give you a good understanding of basics by not only...
  12. umrpwr

    Protection System

    One of the best topic specific books on protective relaying for generators that I have found besides the ABB (Westinghouse) T&D book and IEEE Stds. is the following: Protective Relaying for Power Generation Systems by Donald Reimert and published by CRC Press. It is very comprehensive and...
  13. umrpwr

    Power/Electrical Engineering History or Biography Book Recommendations

    Two books I enjoyed and would recommend depending on your interests are the following: Empires of Light: Edison, Tesla, Westinghouse, and the Race to Electrify the World ISBN-10: 0375507396 ISBN-13: 978-0375507397 Another one that is also very good although out-of-print is the following...
  14. umrpwr

    Power System Protection/Relaying Books

    You may also want to take a look at the SEL website. http://www.selinc.com/bookstore/ They have a new book coming out soon titled: Modern Solutions for Protection, Control, and Monitoring of Electric Power Systems Edited by Héctor J. Altuve Ferrer and Edmund O. Schweitzer, III
  15. umrpwr

    Power Reliability Study

    I would also recommend EYP Mission Critical Facilities which is now a part of HP www.hp.com/go/eypmcf . They specialize in these types of studies. I would suggest contacting Bob Schuerger who is their Principal Relability Engineering and also wrote section in IEEE Gold Book on relibability...
  16. umrpwr

    Why is the L-G fault higher on on a typical Genset?

    majesus, to try and further clarify your question and provide a more detailed explanation below is a section excerpted from the "Electrical Power Disctribution Handbook by Tom Short" which discusses why the zero sequence impedance for a synchronous generator can be lower and the L-G faults...
  17. umrpwr

    Electrical System Design for High Rise Building

    Hi Nonsinusodial, I have quite a bit of expereience in working on distribution systems and networks in high-rise buildings for a utility in a major metropolitan area. I can probably give you some general guidelines on the designs unfortunately I can't share all of the design standards for this...
  18. umrpwr

    Pulverizer Fogging

    I have installed a couple of these systems in coal fired power plants. They are used to contol the coal dust when rail cars are dumping their coal. The systems work well and fairly effective. I believe they were originally developed for the mining industry, but have been used for power plants as...
  19. umrpwr

    Surface Material for Substation Ground Grid

    Assuming economics are not issue which in most cases they are since there is almost always a trade off between cost and design the asphalt would be the better of the two materials. What drives the decision between the two from an engineering design perspective is the touch and step potentials. I...
  20. umrpwr

    "Stiff" Source verses a "Weak" Source

    On a similar note to a previous posting regarding faults and short-circuits another question was discussed regarding what constitutes a “stiff” source of fault current. Again opinions and thoughts were divided as were the responses. Some defined a ‘stiff” source in terms of bus voltage and...
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