Iskra MC330 - APPENDIX E: CALCULATIONS & EQUATIONS; Measurement Equations

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APPENDIXE:CALCULATIONS&EQUATIONS
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72 Measuringcentres
–
MC320,MC330,MC350&MC350H‐User’sManua
l
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APPENDIXE:CALCULATIONS&
EQUATIONS
Calculations
Definitionsofsymbols
No Symbol Definition
1 M
v
 Samplefactor
2 M
P
 Averageinterval
3 U
f
 Phasevoltage(U1,U2orU3)
4 U
ff
 Phase‐to‐phasevoltage(U12,U23orU31)
5 N Totalnumberofsamplesinaperiod
6 n Samplenumber(0≤n≤N)
7 x,y Phasenumber(1,2or3)
8 i
n
 Currentsamplen
9 u
fn
 Phasevoltagesamplen
10 u
fFn
 Phase‐to‐phasevoltagesamplen
11 φ
f
 Poweranglebetweencurrentandphasevoltagef(φ1,φ2orφ3)
Equations
Voltage
N
u
=
U
2
n
N
1=n
f

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Phasevoltage
N‐128samplesinoneperiod(upto65Hz)
N‐128samplesinM
v
periods(above65Hz)
Example:400Hz→M
v
=7

N
2
ynxn
N
1=n
xy
uu
=
U


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Phase‐to‐phasevoltage
u
x
,u
y
‐phasevoltages(U
f
)
N‐anumberofsamplesinaperiod
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