215
Specifications of Equations
Wiring
Item
1P2W
1P3W
3P3W2M
3V3A
3P3W3M
3P4W
Power factor
When equation Type 1 is selected
λ
(
i
)
=
si
(
i
)
P
S
i
i
( )
( )
λ
(
i
)(
i
+1)
=
si
(
i
)(
i
+1)
P
S
i i
i i
( )
+
( )
( )
+
( )
1
1
λ
(
i
)(
i
+1)(
i
+2)
=
si
(
i
)(
i
+1)(
i
+2)
P
S
(
i
)(
i
+1)(
i
+2)
(
i
)(
i
+1)(
i
+2)
When equation Type 2 is selected
λ
(
i
)
=
P
S
i
i
( )
( )
λ
(
i
)(
i
+1)
=
P
S
i i
i i
( )
+
( )
( )
+
( )
1
1
λ
(
i
)(
i
+1)(
i
+2)
=
P
S
(
i
)(
i
+1)(
i
+2)
(
i
)(
i
+1)(
i
+2)
When equation Type 3 is selected
λ
(
i
)
=
P
S
i
i
( )
( )
λ
(
i
)(
i
+1)
=
P
S
i i
i i
( )
+
( )
( )
+
( )
1
1
λ
(
i
)(
i
+1)(
i
+2)
=
P
S
(
i
)(
i
+1)(
i
+2)
(
i
)(
i
+1)(
i
+2)
•If equation Type 1 is selected, the polarity sign
si
for power factor
λ
indicates the lead/lag polarity;
no sign indicates lag, whereas 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
)
.
The signs of
si
12
,
si
34
, and
si
123
are acquired from those of the
Q
12
,
Q
34
, and
Q
123
, respectively.
•If equation Type 3 is selected, the sign of active power
P
is used without being reversed for a
polarity sign.
Power phase
angle
When equation Type 1 is selected
φ
(
i
)
=
si
(
i
)
cos
−1
|
λ
(
i
)
|
φ
(
i
)(
i
+1)
=
si
(
i
)(
i
+1)
cos
−1
|
λ
(
i
)(
i
+1)
|
φ
(
i
)(
i
+1)(
i
+2)
=
si
(
i
)(
i
+1)(
i
+2)
cos
−1
|
λ
(
i
)(
i
+1)(
i
+2)
|
When equation Type 2 is selected
φ
(
i
)
= cos
−1
|
λ
(
i
)
|
φ
(
i
)(
i
+1)
= cos
−1
|
λ
(
i
)(
i
+1)
|
φ
(
i
)(
i
+1)(
i
+2)
= cos
−1
|
λ
(
i
)(
i
+1)(
i
+2)
|
When equation Type 3 is selected
φ
(
i
)
= cos
−1
λ
(
i
)
φ
(
i
)(
i
+1)
= cos
−1
λ
(
i
)(
i
+1)
φ
(
i
)(
i
+1)(
i
+2)
= cos
−1
λ
(
i
)(
i
+1)(
i
+2)
•If equation Type 1 is selected, polarity sign
si
indicates the lead/lag polarity; no sign indicates lag,
whereas 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
)
.
The signs of
si
12
,
si
34
, and
si
123
are acquired from those of the
Q
12
,
Q
34
, and
Q
123
, respectively.
•In equation Type 1 and Type 2, the expression
cos
−1
|
λ
|
is used when the inequality
P
≥ 0
is true; the
expression
|180 − cos
−1
|
λ
||
is used instead when
P
< 0
.
(
i
)
: Measurement channel,
M
: number samples between sync timings,
s
: sample point number
The 3P4W equations are used for Y-
Δ
conversion in 3V3A and 3P3W3M wiring modes.
The 3P4W equations are also used as-is for Y-
Δ
conversion in 3P4W wiring mode.
Specifications
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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