I am looking for a formula how to calculate the relay settings reverse power on SEL 377-1. I found some other formulas but I am not sure if they are applicable to this relay. I couldn't find anything in SEL manuals.
I have 25kW system, CT ratio 200:5, PT ration 36:1. I know I need some...
The issue is that this is a country club, they have a lot of lights but not that many computers. Could dimmers really cause this much voltage drop at peak?
Yes, the light source was dimmable. It worked on B or C phases.
The panel is 208/120 panel and it appears that the peak voltage is being clipped. Also, the user reported that dimmer switch that was installed would not work on A phase but it worked on B or C. Voltage readings were normal as you can see from the graph.
