Cable Voltage Drop Calculation

11kV is not the sort of stuff for the untrained to play about with. So, hire a competent Electrical Engineer to solve the problems.

Your going to start a 35KM conveyor in one start, all be it with 5 motors?

I wish you luck!

it will be with 5 motors

It might be easier to build a railway between the places.

You're seriously going to start 5 motors driving a 35KM conveyor?

You need your bumps feeling.

How are the motors being controlled? It sounds like you are wiring them so they can start in sequence one after the other, with the motor speed being slowly increased to prevent catastrophic equipment failure.

Can you provide more information please.

thanks for your information.

the thing is our project team is proposed conveyor(type of conveyor not mentioned.) for through out the length.so they are asking electrical team for techno commercial feasiblity.

still we are searching the details in this regard. for example we are putting 3 feeders for every conveyor motor like incomer feeder(getting power from previous feeder),motor feeder(supply to motor),outgoing feeder( loop in-loop out).if motor is fixed speed in this option is ok. for variable speed application we have to consider 690V converter duty motor,690V drive & 11/690V converter duty transformer(with OLTC=+/- 10%).for controlling the motor start we shall go with any wireless or radio frequency.Kindly send your suggestion.

It sounds like you just need to consider the 5 loads (voltage drops) connected in a series arrangement and size the cables for the expected starting and operating currents accordingly.

If you are using a ring main system (which is still a little unclear) with the possibility of powering the conveyor motors from either one end or the other then you would need to size the cabling for being powered from either direction (in which case the cable size would be large at both ends and may reduce in the middle).

In my world 35 km = 21 miles. That does not seem reasonable. Has it been done before? Utilities find that the overhead line will be cheaper to build. What size motors? I assume the motors will be equally spaced along the 21 miles.

your question is not clear enough...a rule of thumb we practice here is having your cable sized up at higher voltage with respect to the operating voltage..this is to compensate for in rush currents, voltage drops, and etc..you say your motor is operating at 11kV system, if i were to size up your cable i would go for 15kV rated cables at same operating current level with your 11kV one...

if you're worried enough with your voltage drops, how about stepping up your voltage to a much higher level...