Dont mind me, I just want to come back and read this thread later.
~Matt
I sure hope we find out what caused this anomaly soon. I don't think I can take another sleepless night.
I can sleep fine with the anomaly but I will look like a hero if I can figure out why they are using more KWH.
Well, since you have been called to check out a 4 percent rise in a bill, I'll bet the owner is pinching pennies.
Are all the coolers and freezers full? They are designed to be most efficient when full of product. It has to do with the airflow. Last year we did a large supermarket and there were tests to the controller (Einstein) that could only be done when the coolers were full of product.
Also, has anything been changed that may affect the wash out of the coolers? Could it be that some changes were made to the heating system's air direction to save money by making people feel warmer that could now be washing out the coolers?
What type of historical data do you have? Is there an exact point where the increase occurred, or has it been gradual?
When was the last time the lighting system was re-lamped? Penny pinchers won't do it until they burn out. Some of the rise may be due to old lamps.
Good luck on this. There may be no electrical problem at all, just an owner problem.
Turn the dial to zero, wind up the leads carefully, and whistle as you walk away. That's what I do, and it serves me well.I just was hoping someone would see that sine wave and say 'Yeah that is the problem and you can fix it like this...'
Have you PM'd Brian? He has probably seen a bunch of different shapes.I just was hoping someone would see that sine wave and say 'Yeah that is the problem and you can fix it like this...'
PQ Scope Picture & Question (Brian your phone is ringing)Have you PM'd Brian? He has probably seen a bunch of different shapes.
Thanks for the link, I found the comments interesting. The second picture is really noisy. I also noticed the currents were slightly higher.
Thanks for the link, I found the comments interesting. The second picture is really noisy. I also noticed the currents were slightly higher.
Are you sure the meter is OK?
Have you been able to read higher currents (say above 480 or 490 amps)
ever get a clean signal with those CTs?.