Bore Hoile Pumps 1

[vreijb]

I have an application of bore hole pumps at 300meter distance.
motors data are 195KW, 460V, 3PH, 60Hz with 0.83pf and 86.5% eff.
voltage available is 480V/3/60 and 13.8KV
what type of starter would be appropriate

 

[jraef]

Not enough information. Your choices are either Across-the-Line (DOL), Reduced Voltage, or VFD. If changing speed has any benefit to you, go with the VFD. If not, then you must evaluate what amount of voltage drop your system can tolerate, and what starting that load is going to do in that regard. Then you can determine if ATL or RV is necessary and if it is RV, the sub-choices within that group such as Auto Transformer, Solid State Starter or Reactor (stay away from Star-Delta, it's just bad).

That analysis is somewhat complex and at that size motor and distance, is probably worthy of a good quality study using one of a number of software packages that perform what is called a Transient Motor Starting (TMS) analysis. Anything else is just a S.W.A.G. (Scientific Wild Ass Guess). The software is typically expensive, but you can also consider hiring an Engineer who already has it to do the study for you. Avoiding a burned out motor, starter or a lot of lost production time will likely be worth it for you.


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[Marke]

If you have a variable flow requirement, then you should consider the use of a VFD as a means of reducing energy consumption.
If the flow is constant, AND the pump is correctly sized for the flow and head, there will be no benefit from the use of a VFD and at that point you can consider a soft starter or an electromechanical starter. I agree with Jeff, don't even think about a star delta starter.

Bore pumps will typically start at around 250% current with a good soft starter and the soft starter is able to provide a gentle ramp up and ramp down which is good for eliminating water hammer.

Best regards,

Mark Empson
L M Photonics Ltd

 

[vreijb]

We have ETAP, but the motor acceleration study feature not included. probably we can upgrade it.

Thanks