Electro-Voice 1252, 250 Phase Angles, Total Harmonic Distortion %THD, Watt hour Wh, VAR hour VARh

Phase Angles:

∠= cos−1 (PF )

%Total Harmonic Distortion (%THD):

For Wye: x = VAN, VBN, VCN, IA, IB, IC

For Delta: x = IA, IB, IC, VAB, VBC, VCA

127

∑(RMSxh )2 THD = h=2

RMSx1

K Factor: x = IA, IB, IC

	127			)2
	∑(h • RMS
KFactor = h=1				xh
	127			)2
	∑(RMS
	h=1		xh
Watt hour (Wh):
n	WT (t )
Wh = ∑=
	3600	sec/ hr
t 1

VAR hour (VARh):

VARh = ∑n VART (t )

t=1 3600sec/ hr

e Electro Industries/GaugeTech Doc # E107706 V1.25 2-9