Power factor correction in the presence of ground faults

[vanskat]

I am attempting to realize a stepwise improvement in power factor (0.71 - 0.85) at an aged facility via the installation of capacitors at several low power factor loads. The attempt is to reduce var import from the utility (as well as the other benefits from power factor correction)

Resonance and other issues have been taken into account but I discovered recently that there exists a steady current flow through the system ground conductor.

We were able to identify a few ground faults and cut this value in half but I need some thoughts on how this will affect the power factor improvement initiative.

 

[electricpete]

I am trying to understand the ground current you mention. What is the magnitude of the current?

I can only think of a few ways for current in ground conductor.

1 - unbalanced capacitance to ground. Probably not that big a problem
2 - Ground fault. Should normally result in a trip.
3 - Unbalanced supply? I'm not sure about this one.

You might get a wider audience for this particular question in the power engineering forum.

=====================================
Eng-tips forums: The best place on the web for engineering discussions.

 

[vanskat]

Ground current is approx 90A. Were able to reduce down to 20A based on corrective measures.

No ground fault indicator or shunt trip available. Supply is balanced but there are voltage regulation problems...

You're right, I'll try posting in the power engineering forum

Thanks