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  1. DistCoop

    Milsoft Windmil

    Yes, but I think people would respond to a specific question quicker than generally offering tech support availability. What's your question?
  2. DistCoop

    Milsoft WindMil software

    I've not personally imported an NISC map into WindMil, but have had NISC do it to little headache. Milsoft technical support is responsive and generally available. I've been happy with their support. It's not a difficult program to use. I wouldn't put it in the same class as SKM or...
  3. DistCoop

    PE licensure without reference knowledge

    I might just clarify... I would only be working for one company at a time. The client I referred to would be a client of my current consulting firm. The letters of recommendation are not for employment at another company, they would be to the state board for PE licensure.
  4. DistCoop

    PE licensure without reference knowledge

    My suspicion is this is not an ethical move, but I was curious what others thought. I am a PE in one state in the US, working with a consulting firm. I intend to move to another company in another state in the near future. I would like to get licensed in this other state before I send...
  5. DistCoop

    DER Hosting Capacity discussion

    I thought I'd open a thread to discuss ideas for hosting capacity evaluations for distributed energy resources (DER) on utility distribution systems. I know it'd be of great use to me, and perhaps to any other planning engineers out there. First, I'm curious, is anyone thinking of how these...
  6. DistCoop

    Grid-connected Inverters -Cloudy Day Intermittency

    I can point to Vermont's Public Service Board as an example... when the DER is 15% or less of the annual peak load of the zone of protection in which the interconnection is made, among other things, a fast track screening process can be enacted rather than a full blown system impact study. I...
  7. DistCoop

    Temporary Protective Grounds

    Thank you for the help, good references. In the example, the characteristic impedance is necessary. For that, is it more appropriate to use only the self inductance of a wire then for this case, as there is no other wire and so no mutual inductance between them?
  8. DistCoop

    Temporary Protective Grounds

    In sizing temporary protective grounds for distribution and sub-transmission voltages, I'm debating how to consider lightning. Would it be appropriate to estimate a current stroke and the associated voltage developed across the conductor/person? I'm leaning toward thinking that it is pointless...
  9. DistCoop

    Arch Flash Hazard Analysis

    Yes, equivalent impedance would be required to get the three phase current at that location. You would need the protective device responsible for clearing a fault at that location modeled as well. Also be aware that any motor or generator contribution would need to be considered in that...
  10. DistCoop

    Insulated Ground Grid and Touch Voltage

    Hello, I'm trying to wrap my head around something but can't quite get there. Suppose I have two separate ground grids in close proximity that are connected to each other by conductor. One of these grids is bare conductor, and one is insulated (both have bare ground rods). If I'm the area...
  11. DistCoop

    Substation Ground Well

    The ground well (unless I'm using the term incorrectly) is a metal tube filled with bentonite, through which a large conductor tied to the ground grid runs. This goes down to the water table. The lower resistivity should then lower the overall voltage rise. That's another question though...
  12. DistCoop

    Substation Ground Well

    Does anyone have any thoughts on how a substation ground well might be modeled? I'm using ETAP, which does not have a formal procedure or element to model one. I know the overall grid resistance, and I know the resistance of each well. Ultimately I'm trying to determine GPR, touch and step...
  13. DistCoop

    [ARC FLASH] Multiplier factor for 3 phase arc-in-a-box in a 34.5 kV

    You can find those multipliers in their manual, as you said. You can also find it in a paper they published called "ARCPRO 02.01 Technical Information." I hesitate to hand it out since they gave it to me along with purchasing the program, but you may ask these guys if you're allowed to have...
  14. DistCoop

    Circuit Breakers not selective

    It's an NEC term http://www.eaton.com/Eaton/ProductsServices/Electrical/YourBusiness/ConsultantsandEngineers/DesignResources/SelectiveCoordination/index.htm?wtredirect=www.eaton.com/selectivecoordination
  15. DistCoop

    Raise vs Bonus

    Thanks for the thoughts everyone... all good points. MacGyver is correct, I understand it's not often a great decision, but think it could be now. I'll think some more
  16. DistCoop

    Raise vs Bonus

    One correction: Suppose I were expecting a 5% raise for my PE... would asking for a 10% bonus be appropriate?
  17. DistCoop

    Raise vs Bonus

    Hello all, I work for a consulting firm in the utilities sector. I recently got my PE, and am hoping for a bonus. The thought occurred to me though, it so happens I intend to purchase my first home next year, and some extra cash on hand would be useful. I considered asking for a bonus...
  18. DistCoop

    Run Loop for Known Period of Time

    Hello everyone, I'm thinking I must be making this too difficult, but I'm not able to figure it out. I have within a function a loop that I want to run continuously for some period of time, and plot the results. I've tried to make a variable t within the loop. At the end of the while loop, I...
  19. DistCoop

    Arc Gap and Working Distance for Higher Voltages

    For the working distance, that's what I do. I use Table R-6 rather than calculating it, but that seems appropriate. Arc gap is more of a question to me. I'll often use 20", as that's the greatest gap that ARCPRO has been validated against. My thought is that it's far more conservative than...
  20. DistCoop

    Arc Gap and Working Distance for Higher Voltages

    ...say 34.5kV or 69kV? The suggestions by OSHA seem too small in my opinion. If you consider arc gap for 69 kV, they suggest an arc gap of 0.1* V_LG (approximate dielectric strength of air). That comes out to only 4". If you look at youtube arcing videos, arcs are far longer than 4". As...

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