Here I am raising one technical point regarding indication of power in cockpit in Boeing 747-200.
The scale in combined KW & KVAR indicator in F.E. Panel shows power indication upto -20 on the negative side besides normal positive values.
My question is under what circumstances scale will show negative power?
As per my judgement when power is flowing to generator i.e. reverse flow then indicator will show negative power. In that case the generator will act as motor but rotating in same direction. Can anybody explain in more details?