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  • Users: dfopiso
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  1. dfopiso

    Kwh consumption using 2 CTs and 2 PTs

    thanks Bill so the no. of CTs and PTs have no effect to the multiplier? for 3 CTs and 3 PTs i assume the same procedure in getting the multiplier dave.
  2. dfopiso

    Kwh consumption using 2 CTs and 2 PTs

    hello to all, i would like to know the correct billing multiplier for the following: our tenant has installed a GE V-63-A 480V check meter, with 2 CTs rated 350:5 and 2 PTs rated 240:480. our system is 240 volts line-to-line. thanks in advance to your replies dave.
  3. dfopiso

    VFD causing High current

    hello Alij23 you mentioned, w/o vfd: 600V and 90A -- i assume are operating input values to the motor. assuming balance 3-phase and power factor of 0.9; thus the motor consumes 84.2 Kw if w/ vfd: 480V and 120A -- again are operating input values to the motor, then the motor consumes 89.9 Kw...
  4. dfopiso

    water treatment technologies

    your inputs are all helpful i should give you all stars, can i do that? i will forward your comments to our chem engr., i can only "absorb" so much as i am an elec engr by profession -- i head R&D thats why
  5. dfopiso

    water treatment technologies

    hello coloeng, --------------- What exactly are your concerns with chlorine? --------------- from reading materials of suppliers, "Chlorine in water converts to a large percentage as chloramines. by heat and air agitation, chloramines convert to chloroform, a toxic carcinogen. other by-product...
  6. dfopiso

    water treatment technologies

    hello to all, we are still using chlorine in swimming pool application, but are moving to environment-friendly and lower cost options, such as: 1. ozone generator 2. chlorine dioxide your comments pls in these 2 options. thanks, dave.
  7. dfopiso

    rain water for gray water use

    thanks to all, We are in property development and support initiatives to conserve electricity and water. So in our current planning we are considering using rain water as "gray water" but so far still undecided on a system to use it. dave.
  8. dfopiso

    rain water for gray water use

    hello all, any opinion in using rain water for gray water use (eg. toilet flush, watering garden) in commercial/office buildings. does it need treatment first before using (like in STP)? thanks in advance for all your feedback dave.
  9. dfopiso

    steel transmission tower

    thanks bacon :D
  10. dfopiso

    steel transmission tower

    thanks for the info
  11. dfopiso

    steel transmission tower

    thanks for your replies cuky: is reference ebook or printed? if ebook kindly refer me to their site
  12. dfopiso

    steel transmission tower

    hello to all, im in need of dimensions of steel transmission towers for 500KV, 230KV and 115KV. kindly point me to an existing thread (if available) or any site. thanks.
  13. dfopiso

    transformer sequence impedances

    ...wye-grounded side of the equivalent circuit is connected to the ground while the delta side is open circuited. i noticed your formula to include 3*zn, you might be referring to the total impedance in computing the single line to ground fault current where the general formula is: I_fault = 1...
  14. dfopiso

    TOU rate design

    hello to all, i am working for a utility company and have been using embedded cost of service methodology in our rate design for the longest time. recently our regulators introduced TOU (time-of-use) pricing for our power supplies and mandated all distribution utilities to file respectfive TOU...
  15. dfopiso

    open source optimization programs

    dear forum members, the electric industry is being deregulated in our country (philppines). soon we will be exposed to trading in the electricity pool. as a tool, i believe, is to have knowledge in optimization. i am familiar with power flow and wrote short codes in octave (looks like matlab)...
  16. dfopiso

    Double-logarithm plotting charts

    Hello! DanDel, will appreciate if you can put in a website that file for downloading. currently we are doing protection coordination. Jubailcity, the DIGSI you mentioned is from Siemens? thanks for your response.
  17. dfopiso

    Flooding in the Substation Area

    Thanks alot guys! Your comments are greatly appreciated and will be considered in deciding what to do with the new substation and/or the existing one. Till next time.
  18. dfopiso

    Flooding in the Substation Area

    Hi Lucino! Do you mean probable electrocution? Is this the principle of "touch voltage" or potential difference between a personnel's feet with his hand? But if he is just standing without touching anything? During line-to-ground fault or overvoltage, what would happen to him? Thanks...
  19. dfopiso

    Flooding in the Substation Area

    Good day to all! Due to environmental causes, heavy rains have caused flooding in our 15/20MVA 69/13.8kV substation area. This year we recorded the worst incident - flood rose to 0.30 meters in the substation area. So far we could not see any constraint in operating the substation even when...
  20. dfopiso

    automatic load dropping (ALD) scheme

    hello! its been awhile but i still want to know if the df/dt is built-in function in microprocessor-based frequency relays.

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