Noway2
Electrical
- Apr 15, 2005
- 789
I have a question about an unusual installation. The current situation is as follows: 12.4KV utility service to a step down transformer that reduces the voltage to 4160V. The 4160 feeds a chiller VFD through a motor disconnect. We're looking at adding another variable speed chiller. One of the bids was for two (a dual stage) 480V chiller. This would require a second transformer, 480V switchgear and then two VFDs for 480V. See the attached pdf sketch.
The question that I've been asked is if the 480V drives could cause interference with the 4160V system on the same feed? All drives would have harmonic filters on the inputs to reduce the distortion. I am wondering if anyone has any real world experience with a situation such as this as I am not finding much information and the consulting design / engineering firm says that they don't think it would, but doesn't have a concrete answer.
The question that I've been asked is if the 480V drives could cause interference with the 4160V system on the same feed? All drives would have harmonic filters on the inputs to reduce the distortion. I am wondering if anyone has any real world experience with a situation such as this as I am not finding much information and the consulting design / engineering firm says that they don't think it would, but doesn't have a concrete answer.