Sorry, I should have been clearer. By upstream and downstream I meant the supply side and load side of the capacitor. As far as the size of the cap bank, I don't know. This is a very small municipal utility that doesn't employ an engineer. The longest time employee has been there 25 years and...
I am in the business of selling high voltage test equipment and am trying to help out a customer. The customer is a small municipal utility. They have two places where there are capacitor banks installed on a 4160v feeder. In both places they are getting widely varying readings on either side...
One thing to keep in mind when you are measuring the primary is that instrument transformers can filter harmonics pretty effectively.
I don't know how much time you have before the study but the best reference I have ever read on harmonics and how to do a harmonics survey is Harmonics: A Field...