214
Specifications of Equations
Wiring
Item
1P2W
1P3W
3P3W2M
3V3A
3P3W3M
3P4W
Active power
P
(
i
)
=
P
(
i
)(
i
+1)
=
P
(
i
)
+
P
(
i
+1)
P
(
i
)(i+1)(i+2)
=
P
(
i
)
+
P
(
i
+1)
P
(
i
)(
i
+1)(
i
+2)
=
P
(
i
)
+
P
(
i
+1)
+
P
(
i
+2)
•In 3P3W3M and 3P4W wiring modes, voltage waveform
U
(
i
)
s
is phase voltage.
In 3P3W3M wiring mode, sampled voltage, which is line voltage, is converted into phase voltage.
U
(
i
)
s
= (
u
(
i
)
s
−
u
(
i
+2)
s
) / 3,
U
(
i
+1)
s
= (
u
(
i
+1)
s
−
u
(
i
)
s
) / 3,
U
(
i
+2)
s
= (
u
(
i
+2)
s
−
u
(
i
+1)
s
) / 3
u
(
i
)
s
: sampled line voltage value of channel
(
i
)
.
U
(
i
)
s
: calculated phase voltage value of channel
(
i
)
In 3P4W wiring mode, Sampled voltage is phase voltage, which does not need conversion.
•In 3V3A mode with
Δ
-Y conversion set to on, the 3P3W3M or 3P4W equation is used.
•In 3V3A wiring mode, voltage
U
(
i
)
is line voltage. (3P3W2M and 3V3A wiring modes performs the
same calculation.)
•The polarity sign of active power
P
indicates the flowing direction of power:
+
P
indicates
consumption, whereas
−
P
indicates regeneration.
Apparent
power
S
(
i
)
=
U
(
i
)
×
I
(
i
)
S
(
i
)(
i
+1)
=
S
(
i
)
+
S
(
i
+1)
S
(
i
)(
i
+1)
=
+
( )
+
( )
3
2
1
S
(
i
)(
i
+1)(
i
+2)
=
3
3
(
S
(
i
)
+
S
(
i
+1)
+
S
(
i
+2)
)
S
(
i
)(
i
+1)(
i
+2)
=
S
(
i
)
+
S
(
i
+1)
+
S
(
i
+2)
•For
U
(
i
)
and
I
(
i
)
, the rectification method can be selected between rms and mean.
•In 3P3W3M and 3P4W wiring mode, voltage
U
(
i
)
is phase voltage.
•In 3V3A mode, voltage
U
(
i
)
is line voltage.
Reactive power
If equation Type 1 or Type 3 is selected
Q
(
i
)
=
si
(
i
)
S
P
i
i
( )
( )
−
2
2
Q
(
i
)(
i
+1)
=
Q
(
i
)
+
Q
(
i
+1)
Q
(
i
)(
i
+1)(
i
+2)
=
Q
(
i
)
+
Q
(
i
+1)
Q
(
i
)(
i
+1)(
i
+2)
=
Q
(
i
)
+
Q
(
i
+1)
+
Q
(
i
+2)
If equation Type 2 is selected
Q
(
i
)
=
S
P
i
i
( )
( )
−
2
2
Q
(
i
)(
i
+1)
=
S
P
i i
i i
( )
+
( )
( )
+
( )
−
1
2
1
2
Q
(
i
)(
i
+1)(
i
+2)
=
P
S
(
i
)(
i
+1)(
i
+2)
(
i
)(
i
+1)(
i
+2)
2
2
−
•If equation Type 1 or Type 3 is selected, the polarity sign
si
for the reactive power
Q
indicates the
lead/lag polarity; no sign indicates lag, whereas a negative sign (−) indicates lead.
•The polarity sign
si
(
i
)
is acquired based on the lead/lag between voltage waveform
U
(
i
)
s
and current
waveform
I
(
i
)
s
for each measurement channel
(
i
)
.
•In 3P3W3M and 3P4W wiring modes, voltage waveform
U
(
i
)
s
is phase voltage.
In 3P3W3M wiring mode, sampled voltage, which is line voltage, is converted into phase voltage.
U
(
i
)
s
= (
u
(
i
)
s
−
u
(
i
+2)
s
) / 3,
U
(
i
+1)
s
= (
u
(
i
+1)
s
−
u
(
i
)
s
) / 3,
U
(
i
+2)
s
= (
u
(
i
+2)
s
−
u
(
i
+1)
s
) / 3
u
(i)s
: sampled line voltage value of channel
(
i
)
.
U
(
i
)
s
: calculated phase voltage of channel
(
i
)
•In 3P4W wiring mode: Sampled voltage, which is phase voltage, does not need conversion.
•If equation Type 2 is selected, results are unsigned.
HIOKI PW8001A961-00
Summary of Contents for PW8001-01
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Page 6: ...Contents iv HIOKI PW8001A961 00...
Page 56: ...50 Checking Connections HIOKI PW8001A961 00...
Page 120: ...114 Power Calculation Method HIOKI PW8001A961 00...
Page 162: ...156 Controlling Integration with External Signals HIOKI PW8001A961 00...
Page 236: ...230 U7005 15MS s Input Unit HIOKI PW8001A961 00...
Page 258: ...252 Index HIOKI PW8001A961 00...
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