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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. DistCoop

    Arc Gap and Working Distance for Higher Voltages

    Has anyone given any thought to the appropriate arc gap or working distance for voltages over 15 kV for arc flash studies... 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...
  9. DistCoop

    DG Interconnection References

    Does anyone have any good references on DG interconnection studies? I'm thinking primarily PV, but any DG really. Most of the books I've seen are on designing solar arrays and inverter integration. I'm at the stage where someone has designed the solar array and selected the inverter... I must...
  10. DistCoop

    Two Port Networks

    Does anyone know if this circuit has a name, or better still have an idea of how to solve? If I have a known current and voltage I1 and V1, how is the current through each impedance element determined? I've searched through filter design literature without success, and have attempted deriving...
  11. DistCoop

    Ladder Network Solution

    Perhaps I've been out of school for too long, but I don't recall how to solve this circuit. It appears to be used as a filter topology, so someone must know, but I can't find it. I want to be able to calculate voltage and current at each node. Anyone have any tips on where to look, or where...
  12. DistCoop

    Three Phase Arc Flash Boundary in ARCPRO

    How do you guys handle determining three phase arc flash boundaries using ARCPRO? Single phase arc flash boundary can be achieved with trial and error, continually adjusting the working distance until your incident energy at that distance is equal to 1.2 cal/cm2. But what about three phase...
  13. DistCoop

    Arc Flash Three-Single Phase Multiplier

    I've run across a few multipliers in converting single phase arc flash energy to three phase, and vice versa. ARCPRO gives a range of multipliers, the most conservative being three phase energy is equal to 2.2 times single phase. Duke Power suggests that the factor is 2.8. Any idea where...
  14. DistCoop

    Inductive/Capacitive Inrush

    All, A thread titled "Blinking Lights" came up in the Electric motors, generators & controls engineering forum. There was some disagreement over whether a power factor capacitor in parallel with a motor would result in increased or decreased inrush. Looks like the consensus was decreased...
  15. DistCoop

    Wye Delta for 120V/240V Service Fault Analysis

    All, I've searched the forums and was surprised to see this hadn't been addressed, so if I've overlooked something, please let me know. I have a three phase wye-delta 12.47kV to 240V with a tap on one delta leg for 120V. The wye is ungrounded, and the tap on the delta is grounded. How...
  16. DistCoop

    Determining Distribution Project Length

    Hello, I am a system planning engineer at a consulting firm for electric distribution utilities. Among my tasks is to develop construction work plans, identifying future projects, line upgrades/additions, etc. These work plans are used for future spending estimation and purchasing... the...
  17. DistCoop

    Excessive Neutral Current

    All, Is there a standard or reference out there describing neutral current or voltage/current imbalance limits (three phase 4.16kV wye overhead, United States)? I'm working on a study and am finding imbalance as much as 30% which I know is high, but I'd like to be able to point to a standard...
  18. DistCoop

    Relay Settings

    I've come across a Westinghouse CO-8 relay for a 13.8kV feeder. A testing company has covered up the nameplate of the relay with their test data, but I'm unsure what it means. The paper reads: 120A P.U. 360A -48~ 660A -INST This is fed by a 100:5 CT, so the pickup and the...
  19. DistCoop

    Contacting a Potential Employer

    All, I've posted a few questions related to job searches, and have yet another. I have sent my resume to a few companies this week, some large, some small. For one of the smaller companies, I have corresponded with an HR/secretary person, and she told me that she sent my resume to the head of...
  20. DistCoop

    Follow up to Call to Large Company

    All, I've recently applied for an engineering position at a large utility (approximately 700 people). I submitted a resume and cover letter online, and they will get back to me if they decide I'm worth considering. Should I give them a follow up call in a week or so? They're such a large...

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