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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.

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

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...

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...

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...

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...

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

Hello prc. First let me thank your reply. Unfortunately my client does not specify the exacly purpose of the reactor, only said that it should be a current limiting device. I've been trying to collect more information and understand how it should work, but the anwser it’s always the same: “it...

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...

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...

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 =...

But the wiring diagram is ok?

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

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

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...

(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

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

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

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.

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...