YOKOGAWA WT1800 User Manual page 116

Appendix 1 Symbols and Determination of Measurement Functions
Measurement
Function
I[A]
*1
P[W]
*1
ΣU[V]
Three-phase,
four-wire
3P4W
ΣU[V]
Three-phase,
three-wire with
three-voltage,
three-current
method.
3P3W(3V3A)
ΣI[A]
Three-phase,
four-wire
3P4W
App-10
rms
True rms value
mean
Rectified mean value calibrated to the rms value
π
N−1
1
×
N
2 2
n=0
rmean
Rectified mean value
dc
Simple average
Active power
rms
True rms value
mean *1 Rectified mean value calibrated to the rms value
π N−1
1
×
N
2 2
n=0
rmean
*1
Rectified mean value
dc
Simple average
rms
True rms value
Rectified mean value calibrated to the rms value
mean *1
N−1
π 1
×
N
2 2
n=0
rmean
*1
Rectified mean value
dc *2
Simple average
rms
True rms value
Rectified mean value calibrated to the rms value
mean
*1
π N−1
1
×
N
2 2
n=0
rmean
*1
Rectified mean value
dc
Simple average
Methods of Computation and Determination
N−1
1
[i(n) ]
HSFilter 2
N
n=0
HSFilter [|i(n)|]
N−1
1
HSFilter [|i(n)|]
N
n=0
N−1
1
HSFilter [i(n)]
N
n=0
N−1
1
HSFilter [u(n)×i(n)]
N
n=0
N−1
1
HSFilter [{u1(n)
N
n=0
HSFilter [{|u1(n)|+|u2(n)|+|u3(n)|}/3]
N−1
1
HSFilter [{|u1(n)|+|u2(n)|+|u3(n)|}/3]
N
n=0
N−1
1
HSFilter [{u1(n)+u2(n)+u3(n)}/3]
N
n=0
N−1
1
HSFilter [{u1(n)
N
n=0
HSFilter[{|u1(n)|+|u2(n)|+|u3(n)|}/3]
N−1
1
HSFilter [{|u1(n)|+|u2(n)|+|u3(n)|}/3]
N
n=0
N−1
1
HSFilter [{u1(n)+u2(n)+u3(n)}/3]
N
n=0
N−1
1
HSFilter [{i1(n)
N
n=0
HSFilter [{|i1(n)|+|i2(n)|+|i3(n)|}/3]
N−1
1
HSFilter [{|i1(n)|+|i2(n)|+|i3(n)|}/3]
N
n=0
N−1
1
HSFilter [{i1(n)+i2(n)+i3(n)}/3]
N
n=0
+u2(n) +u3(n) }/3]
2 2 2
+u2(n) +u3(n) }/3]
2 2 2
+i2(n) +i3(n) }/3]
2 2 2
(Continued on next page)
IM WT1801-03EN