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  • Users: tonyjony
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  1. tonyjony

    simocode pro v device 46 settings

    Hi everyone, we are designing a water treatment plant. There are several pumps and compressors. The client wants to use Siemens simocode Pro V relays, but I don't know the range avaible to set the unbalanced load relay (% of unbalance or delay), niether the setting I should use. I surf all over...
  2. tonyjony

    MV Transformer Distribution

    And if the transformer-line-transformer allows a reasonable voltage regulation...
  3. tonyjony

    Grounding ZNzn transformers in ETAP

    busted! I googled for "Zig-Zag transformers" only :p thanks a lot!
  4. tonyjony

    Grounding ZNzn transformers in ETAP

    Hi everyone, I'm sorry if this question is already answered, but I didn't find it. I have a 132kV system, a 132/13.8kV YNd transformer and a Znzn transformer to provide neutral on 13.2kV system. I need to calculate LG short circuit current, so I'm using ETAP. I don't know how to simulate the...
  5. tonyjony

    Instantaneous device setting protecting a generator

    Thanks everybody for the advices. This what I did after all: I deactivate the instantaneous protection and set the Long time overcurrent protection 1.15 FLA (IEEE Buff book). Time delay was coordinated to trip the CB with the 51V (voltage restrain)as backup of the feeders protection.
  6. tonyjony

    Instantaneous device setting protecting a generator

    Please educate me: The system is something like this: network---xfmr---bus---generator | other loads If there is a 3ph short circuit in the bus, should I need to cordinate de generator device 50? Isn't the best thing to trip the generator as soon as possible...
  7. tonyjony

    Instantaneous device setting protecting a generator

    It's a 2MW cogeneration system added to an existing plant. I don't have info about the rest of the plant protections yet.I'm trying to save some time starting with the generator protection earlier. I thought I could use the 50 to cut the deliver of current to the bus it's connected in case of a...
  8. tonyjony

    Instantaneous device setting protecting a generator

    Wich is the usual setting in % of FLA of an instantaneous relay (50), protecting a generator against external faults?
  9. tonyjony

    ETAP Prysmian Retenax Cable Lybrary

    Hi, I'm modeling an existent oil refinery electric system in ETAP 6.0.0. I don't have the cables used there in my lybrary, and I can't find the minimum data it requires to create it (zero sequence impedances, in example). Does anybody has it? do you know where can I find theese data? Cables are...
  10. tonyjony

    Circuit Breakers

    The frame is the max. continous current that the CB can be seted to open (not under fault conditions, but overloading for example) in the long-time characteristic curve. The trip is the actual current that the CB is seted.
  11. tonyjony

    Voltage impedance

    You don't calculate it. It must be provided from the manufacturer and It's obteined with the Test described by waross. 5% is a typical value for that transformer.
  12. tonyjony

    metric cables

    The first number is the phase conductor size (3 of the 4 cores)and the second one is the neutral conductor size (both in mm^2)
  13. tonyjony

    different currents on the parallel wires of a phase

    Take a look to this document. It's in spanish, but the figure in the Error#1 it's very clear. It's the recomended array of cables of the same phase running together.http://files.engineering.com/getfile.aspx?folder=f927d4c4-1af0-4e41-a974-e2fc04dbdb38&file=Errores_en_el_trabajo_con_cables.pdf
  14. tonyjony

    Parameter of 3 windings transformer

    Tha calcs are Ok, but not the values. 3. Uk(H/X)=12% to 6.8MVA base 4. Uk(H/Y)=5% to 0.8MVA base 5. Uk(X/Y)=7.5% to 0.8MVA base I thought the "to" was the base of the impedance after the pwrtran post. I think that my first post is the right one
  15. tonyjony

    Parameter of 3 windings transformer

    let me know if I'm wrong: Z=Zpu1*Zb1=Zpu2*Zb2 Z=U^2/S Zpu2=Zpu1*(Ub1^2/Sb1)/(Ub2^2/Sb2) If the impedance in pu it's higher or lower depends of U^2/S ratio Anyway, I think those values are odd, so maybe the Uk given are not in the base you are saying
  16. tonyjony

    Parameter of 3 windings transformer

    Using 7.6MVA as base: z12(7.6) 0.05pu 5% Z13(7.6) 0.0003pu 0.03% z23(7.6) 0.0004pu 0.04%
  17. tonyjony

    Parameter of 3 windings transformer

    The rated power is the winding power, so the minor rated power in the power flow is the one you are looking for (0.8MVA). Z12=12% z23=7.5% Z13=5%
  18. tonyjony

    3 Phase 380V 50 Hz

    Argentinian codes (IRAM) are based on IEC codes, and it's acepted the European 400V standard for equipment nominal voltage.
  19. tonyjony

    transformer impedance base conversions

    I just read this: Primary: 6.9/13.8kV Delta Secondary: 600Y/347 sorry
  20. tonyjony

    different currents on the parallel wires of a phase

    there are 6 conductors per phase

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