I am taking a wild stab at this here but is there someone that can rent out a Power Quality Analyzer, like the ‘Fluke 435-II Series of Power Quality Analyzers’ or even a service that does analyses that I can make use of?
I have a strange grid frequency disturbance that triggers my inverter to Invert. My Zhiel doesn’t pick it up and my own measurements point to a sudden and short frequency shift, usually only two or three cycles. My PC UPS picks it up as a sudden ‘click’ and then immediately after another ‘click’ and then all is back to normal. When I am in Bypass Mode (C/O Switched to Grid rather than Inverter) I don’t notice it at all, no flicks of the lights nothing, just the UPS ‘Click/Click’ and the Inverter going to Inverting Mode and soon afterwards back to Grid.
Buying one of these analyzers is too expensive to satisfy my curiosity - and I am WAY curious about this. Maybe someone working for Eskom or other consulting firm to Eskom could give me some pointers. I have even thought of giving the CSIR a call to hear what they recommend I can do or try. The normal sparky’s don’t usually carry such expensive equipment in their arsenal, it’s specialty kit for engineering consulting firms if you ask me.