Looking for some insight on a problem I’m running into. Doing some troubleshooting at a satellite dish site, Main breaker has a reverse power, and a directional relay along with an over current relay. The board has a sole purpose of feeding de-ice heaters to melt ice off of the big dishes during...
If you need help on the testing end, let me know. I run a group out of Boston, all we do is acceptance and maintenance testing in the MA, CT & NH area. We follow all NETA standards.
-Brad
I believe they are getting penalized for power factor, i will request their electric bills and do some research. This may be fixed in a much easier manner as you guys say. Are we all in agreement that the survey I attached performed by this guy is a little over zealous with his savings per...
Ahhh, your right I was looking at it all wrong, those savings are not even worth looking at. Did you happen to see the sheet I attached above? I'm trying to figure where this guy is coming from and if this "black box" is worth installing throughout these buildings.
thanks ccjersey & DWR much...
Waross, if i'm correct here. If we add 75kVARs to that motor to bring the PF up to what would be about .998PF. That drop in 37A would result in the following kVA due to a smaller reactive vector:
Before 175A (145kVA/(480*1.73)
After 138A (115kVA/(480*1.73)
Gives you the 37A Delta
At this...
Guys attached are the survey results from a couple of motors in the building. From what I understand the intention is to install this little black box on a couple motors to see if the system works and from that there are almost 20 buildings full of motors to proceed with. This guy who surveyed...
Ok the next step is where I get hung up. I need to solve for my resistance / reactance values.
Q = E^2/X which leads to X = E^2/Q but is this the same for a 3-Phase system. I always mess up the equations here, with where to include 1.73 for 3-phases etc. etc. I know this sounds dumb...
On...
Ok guys, little rusty over here..project management too long and not enough engineering in my life I guess.
We recently surveyed at Pump 150 H.P. 480V 3P. Initial Current was 175A @ .79PF We have a guy who claims he makes a "little black box" that will change the intial PF to .96 reducing the...
