EPM Parameters

Where have you looked, so far?

Is the 2-nd one the one given up into the grid (consumer generated),

the 3-rd one - inductive reactive, the 4-th - capacitive reactive (or vice versa) ?

AC power - Wikipedia, the free encyclopedia

True, Reactive, and Apparent power - All About Circuits

This one even comes with formulas:

Active, Reactive, Apparent and Complex Power. Simple ...

Oh, I reckon your colleague, the one over there holding the user guidance leaflet that came with it, could help you. Yes indeed.

So, not me alone would be gazing at the meter, scratching his head wondering : what "Active power - P " 0,5 MW stands for ?

("Active power + P " being 1700 MW for the period)

There's no generic answer.

I'd recommend to carefully check the equipment documentation because those signs are no that universally well defined. For example when commissionning power generation equipment it's, for the inerfacing of devices it's important to know how analog measurement values are defined (as well as 4-20, 0-10 V, +/- 0-10 V,... or data link). For example power flow direction (for reverse power protection), active/reactive power, power factor must be clearly defined when interfacing a digital excitation system with a SCADA system (also compare how things are seen from a generator POV vs. grid POV).