Operation Manual

MI 2092 Power Harmonics Analyser Section VI Theory of operation
52
Per Phase Values (averaged at the end of an IP)
Watts
()
aP
P
pn
x
x
j
j
n
+
+
=
=
å
1
(
)
aP
P
pn
x
x
j
j
n
-
-
=
=
å
1
VAr
(
)
aQ
Q
pn
xi
xi
j
j
n
+
+
=
=
å
1
(
)
aQ
Q
pn
xc
xc
j
j
n
+
+
=
=
å
1
VAr
(
)
aQ
Q
pn
xi
xi
j
j
n
-
-
=
=
å
1
(
)
aQ
Q
pn
xc
xc
j
j
n
-
-
=
=
å
1
PF
()
()
aPf
aP
aQaP
xi
xi
x
x
+
+
++
=
+
2
2
()
()
aPf
aP
aQaP
xc
xc
x
x
+
+
++
=
+
2
2
PF
()
()
aPf
aP
aQaP
xi
xi
x
x
-
-
--
=
+
2
2
()
()
aPf
aP
aQaP
xc
xc
x
x
-
-
--
=
+
2
2
Volts & Amps
()
aU
U
upn
x
x
j
j
n
=
=
å
1
()
aI
I
pn
x
x
j
j
n
=
=
å
1
Harmonics
aUthd
HU
HU
x
yx
x
=*
1
100
;
()
HU
Uh
hpn
yx
n
j
j
z
z
n
=
æ
è
ç
ö
ø
÷
==
åå
2
2
63
1
;
HU
Uh
hpn
x
x
z
n
1
1
1
=
=
å
aI
thd
na
x
=
a
na
x
cos
j
=
aU
H
na
x
n
=
aI
H
na
x
n
=
Note: If power breaks occur, periods ‘pn’ (for power calculations) and ‘upn’ (for voltage
calculations) are modified to:
pn
IP
ic
pb
ic
=- upn
IP
ic
pb
ic
ic
l
=--
Where: ic = input cycle time
pb = power break time inside the IP
ic
l
= number of cycles with U
x
< 0.02 U
range