Iskra MT440 - Calculations

AppendixB:Calculations&equations
52 User’sManual
8.1 Calculations
Definitions of symbols
No Symbol Definition
1 M
v
Sample factor
2 M
P
Average interval
3 U
f
Phase voltage (U
1
, U
2
or U
3
)
4 U
f
f
Phase-to-phase voltage (U
12
, U
23
or U
31
)
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 (φ
1
, φ
2
or φ
3
)
12 U
c
Agreed supply voltage