I have o project about STS crane system. My system have four group AC motor.
Main motor Hoist: 180 KWx2. (02 motor)
Trolley Motor: 22 KW x4 (04 motor)
Gantry motor: 10.5 KW x8 (08 motor)
Boom motor: 60KW (01 motor).

When the system active. When the first time, Motor Hoist and trolley is running.
I have to choice a main transformer for that system.
i chose a main transformer about 630KVA. Please see my file:
http://www.mediafire.com/?dszdsqsbqad4zpj

I don't known which options are correct? Please help me!

Thanks!

 

Ha... you have not indicated the location of the crane, so the following comments pertain to a USA installation!

The National Electric Code (NFPA-70) is the most widely adopted code in the US!

Caveat... one of the most salient requirements concerns system-earthing (grounding) and bonding. Current code no longer permits wheel-rail contact as an adequate earthing (grounding) connection!

If additional information is required, contact me at [email protected]

Regards, Phil Corso