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  1. mikeangel

    HV Connectors - Expansion Type

    Hi! The customer does not accept the exchange of the rigid bus by cable. The solution to adopt will have to go through the use of a rigid bus.
  2. mikeangel

    HV Connectors - Expansion Type

    Hi jghrist, thank you for your reply. I had the following arrangemnet:
  3. mikeangel

    HV Connectors - Expansion Type

    Hi! I have a situation where a customer plans to install an aluminum tube between 2 Measuring Transformers and in the middle, to support the tube I have 1 rigid insulator. To make the connection between the tube and the Measurement Transformer terminals I am thinking of using "Expansion" Type...
  4. mikeangel

    Automatic Voltage Regulator Devices - Parallel Operation

    Hi all! I've actually having some issues related to the theme Automatic Voltage Regulator in Power Transformers. The scenario is: a Substation with only one Power Transformer that is equiped with an OLTC and an AVR. The client (national grid company) recently have decide to construct a new bay...
  5. mikeangel

    Current Limiting Reactor Sizing

    Hello prc! Thank you for your reply and for all the help and for correct my calculations, in particular the determination of the power transformer impedances. From what I understand the air core reactor in this case will limiting the 3L short circuit (that could apper between the tertiary...
  6. mikeangel

    Current Limiting Reactor Sizing

    Hi prc! Thank You for the reply. Well, now i must confess that i'm really lost...if you could help i'll be very grateful. The power transformer tertiary in this particular case will not be used for received any feed only for supplying the AC auxiliary supplies of the substation. Regarding to...
  7. mikeangel

    Current Limiting Reactor Sizing

    After several attempts, my client refuses to help me and does not accept any other solution...
  8. mikeangel

    Current Limiting Reactor Sizing

    ...7,04kA Icc(H-T) = 4,31kA Icc(L-T) = 14,1kA (i guess this should be the one that i must choose, because is the worst case scenario) [Icc = (In/z%) *100; In = 769,8A] Scenario 1: If I approach from the first scenario (1), from what I understant the reactor should limiter the 3L faults...
  9. mikeangel

    Current Limiting Reactor Sizing

    So, in this particular situation, the source is the power transformer tertiary that will have a maximum short-circuit current of 14,14kA. Downstream i will have the auxiliary transformer and an AC main distribution board in the control building. The highest short-circuit current downstream of...
  10. mikeangel

    Current Limiting Reactor Sizing

    waross, thank you for your quick reply, but I'm not understand how to choose an adequate value for the Isca. I don't have any reference to guide me, and because of that I imagine that three-phase short-circuit on the secondary side of the Auxliary Transformer was the answer. Could you please...
  11. mikeangel

    Current Limiting Reactor Sizing

    Hi! I need help to sizing a Current Limiting Reactor to be inserted in series in the Power Transformer Tertiary 15kV Circuit, as you can see in the attached file. After checking several documents I found that I can sizing the Current Limiting Reactor by applying the following formula: Xr =...
  12. mikeangel

    Double Pole Voltage Transformer - Marshalling Box Wiring Diagram

    But the wiring diagram is ok?
  13. mikeangel

    Double Pole Voltage Transformer - Marshalling Box Wiring Diagram

    waross, it is usual in our client substations to install MCB in these circuits.
  14. mikeangel

    Double Pole Voltage Transformer - Marshalling Box Wiring Diagram

    I came with the attached wiring diagram for the marshalling box. What do you think? It is ok? Thank youhttps://files.engineering.com/getfile.aspx?folder=af181801-f542-44a2-97cc-14eba86296b3&file=Wiring_Diagram.pdf
  15. mikeangel

    Double Pole Voltage Transformer - Marshalling Box Wiring Diagram

    Thank you waross for your suggestions and advices. My major problem is in the drawing of the marshalling box wiring diagram, because I never see this kind of arragement/assembly, ie, using two double-pole voltage/potential transformer with two secondary cores in a 3phase system. I'm working...
  16. mikeangel

    Double Pole Voltage Transformer - Marshalling Box Wiring Diagram

    (part 2of2)https://files.engineering.com/getfile.aspx?folder=2eb2420d-305c-406f-bb13-5b84604ddd17&file=Double_Pole_Voltage_Transformer_-_Marshalling_Box_Wiring_Diagram_pag1of2.pdf
  17. mikeangel

    Double Pole Voltage Transformer - Marshalling Box Wiring Diagram

    Dear all, I've upload the elements that i've. (part 1of2) Regardshttps://files.engineering.com/getfile.aspx?folder=790e8d19-e78e-4637-b778-30b3a9ac617e&file=Double_Pole_Voltage_Transformer_-_Marshalling_Box_Wiring_Diagram_pag2of2.png
  18. mikeangel

    Double Pole Voltage Transformer - Marshalling Box Wiring Diagram

    Yes waross, tomorrow I will upload what I have. Thank you.
  19. mikeangel

    Double Pole Voltage Transformer - Marshalling Box Wiring Diagram

    Hi everyone! Could someone please be so kind and provide a marshalling box wiring diagram for this situation particular situation where I've to 2 double pole voltage transformer with two secondary windings in a 15kV 3-phase busbar. Thank you in advanced.
  20. mikeangel

    MV Cable Sizing - Power Transformer Tertiary to Auxiliary Services Transformer

    prc in fact, is this example it is an Auto-transformer. All of these situations I describe are for substations whose projects were developed by the entity responsible for the energy transport network. I do not really know how the faults on the primary side of the Power Transformer and its...

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