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I've been calculating motor starting flicker using the basic formula: LRA x (R cos0 + X sin0) where cos0 = starting pf and R & X values are in ohms I've run across a different method of calculation that I'm not familiar with and was wondering if anyone could provide some insight. Is this...

Where can I find a table with typical power factors for heat pumps and A/Cs?

Can someone tell me if there is a reference that provides typical distribution transformer impedances? I'm looking for %Z and either X/R ratios or %X and %R values. The X/R table in IEEE red book is not adequate.

Can someone tell me if there is a reference that provides typical distribution transformer impedances? I'm looking for %Z and either X/R ratios or %X and %R values. The X/R table in IEEE Red Book is not adequate.

In the IEEE Buff Book (ANSI/IEEE std 242-1986) more specifically page 94, figure 21 shows the basic formula for calculating parallel impedance. Z= (R1+jX1)*(R2+jX2)/(R1+jX1)+(R2+jX2) If you substitute some simple whole numbers for the values such as R=2 and X=2 (for ease of calculation) the...

In the IEEE Buff Book (ANSI/IEEE std 242-1986) more specifically page 94, figure 21 shows the basic formula for calculating parallel impedance. Z= (R1+jX1)*(R2+jX2)/(R1+jX1)+(R2+jX2) If you substitute some simple whole numbers for the values such as r=2 and x=2 (for ease of calculation) the...