How to determind need of power factor correction? 1

[schan05]

Out plant is putting in a 1600HP electric chiller, connected to 4.16kV distribution system with autotransformer starter. Should we consider power factor correction for this installation? If so, what are the major issues we should cover while doing calculations? Many thanks.

 

[rbulsara]

Two things usually justify or rule out installation of PFC.

1. If your paying penalty,to the utility co., for poor power facotor.

2. If the resultant redcution in kVA demand really translates in to significant saving in utility bills.

In some cases, utility may not be problem but your back up source such as generator kvA rating may be.

Other theoratical benefits such as savings by reduction in I^2R losses etc., which only helps in upsream circuits, alone may not justify PFC installation.

Also look at what percentage of total energy cost the savings will be.

Also if you are unlucky, adding caps may introduce other problems such as harmonics, overvoltages, resonsnace..all of which can be mitigated by proper system analysis.

 

[aolalde]

See Motor Power Factor & Energy Conservation at

http://www.usmotors.com/default_help.htm

 

[busbar]

 
For many, an effective way to determine payback of PF-correction investment is by ‘running the numbers’ of the applicable electric-rate schedule. Some are available as .xls files on utility websites.

If there is significant rectifier load in the facility, careful measurements prior to PF-equipment specification/procurement is advised.

 

[schan05]

Thank you all.