Electro-Voice 250, 1252 operation manual Measurements and Calculations

2.6: Measurements and Calculations

The Nexus 1250/1252 Meter measures many different power parameters. The following is a list of the formulas used to conduct calculations with samples for Wye and Delta services.

Samples for Wye: van, vbn, vcn, ia, ib, ic, in

Samples for Delta: vab, vbc, vca, ia, ib, ic

Root Mean Square (RMS) of Phase to Neutral Voltages: n = number of samples

For Wye: x = an, bn, cn

∑vx2(t )

VRMS x = t =1 nn

Root Mean Square (RMS) of Currents: n = number of samples

For Wye: x=a, b, c, n

For Delta: x = a, b, c

∑ix2(t )

IRMS x = t =1nn

Root Mean Square (RMS) of Phase to Phase Voltages: n = number of samples

For Wye: x, y= an, bn or bn, cn or cn, an

∑(vx(t ) − vy(t ) )2n

VRMS xy	=	t =1
		n

For Delta: xy = ab, bc, ca

∑vxy2 (t )

VRMS xy = t =1 nn

e Electro Industries/GaugeTech Doc # E107706 V1.25 2-6