Answer / shareef m. m. el-shekshaky

Electrical machines can be rotating or static.
Rotating machines such as motors or generators and they have a stationary part called stator and a rotating part called rotor which has shaft and bearings helping to rotate inside the stator keeping an air gap in between.
Stationary machines; yes machines constructed mainly from Laminated iron core and windings which are all stationary; not designed to move or rotate.

Hi, I've just got into my electrical engineering course and I need some help with a question of mine here. During a site visit, we were shown a main LT panel which has switchgears, ammeters and different kinds of relays and the distribution network from that panel. In the main LT panel I've noted down the current readings as Ir - 163A, Iy - 150A and Ib - 147A. The Line to Line voltage is 415 V at 50 Hz and Line to Neutral voltage is 230V at 50 Hz. From the above details, how would I calculate the kVA rating of transformer? The primary side voltage of the transformer is 11 kV and the secondary side voltage is 415V and the frequency is 50 Hz.

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