Calculating Uncorrected Voltage

[OhioAviator]

I hope someone can help.
While taking some measurements on a site's automatic static var compensation system, the following instantaneous information is made available from the ASVC controller:
(a) Peak L-L Voltage
(b) Inductive Load in KVARs
(c) Total KVARs of capacitance switched ON

Question: Is it possible to calculate what the unsupported Line voltage (Peak or RMS) would have been without the KVARs of capacitors switched On, i.e. with the ASVC switched off-line?

Thanks!

 

[jghrist]

You need to know the source impedance. The voltage rise resulting from an energized capacitor bank is:

% volt rise = kvar·X_L/10/kV²

where X_L is the inductive reactance of the source, kvar is the 3Ø capacitor size, and kV is the Ø-Ø voltage.

 

[OhioAviator]

Thank you, jghrist, for your very helpful reply. That solved my problem as I was able to put together a spreadsheet of the effect that the stat-var compensator has on the power system and, more importantly, was it worth the money?

Again, Thanks!