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Thank you waross and 7anoter4!

The power transformer is not yet manufactured and the nameplate drawing is not completed until the FAT. Nevertheless, I want to know how I should do it.

Hello All! I need help to calculate the impedance of the Power Transformer in order to determine the Isc3k (Three-phase fault) by the impedance method. I have the bellow circuit: The Power Transformer have 3 windings: Primary (1N), Secondary (2N) and a Tertiary (3N). An Auxiliary...

Thank you 7anoter4 for your help. Thank you St_Isakovic for your contribution.

Hi 7anoter4, I'm still confused about the corrected method to be use. The following IEC table defines that the cable channels methods are: I know that none of the methods represents an "unfilled concrete cable channel with the top flush with the soil surface that is buried at 0,7 metres...

Hi che12345 Hi anoter4 First let me thank you for your time and for your opinion in this subject. Since the concrete tray are not ventilated I agree with both of you, I must choose another method. The concrete tray runs with the lid at the ground level (0,00) and the bottom of the concrete...

Hi! I'm selecting the conductors according the IEC 60364-5-52 in a Substation. We're using concrete cable trays like the following: They are sheathed multi-core cables. Regarding with the reference number and the method of installation to be used for the calculations i thing of use the...