Hioki PW8001-01, Instruction Manual

Page: 219 / 262

213
Specifications of Equations
Wiring
Item
1P2W 1P3W 3P3W2M 3V3A 3P3W3M 3P4W
Current RMS
value
Irms
( i )
=
Irms
(
i
)(
i
+1)
=
1
2
( Irms
(
i
)
+ Irms
(
i
+1)
) Irms
(
i
)(
i
+1)(
i
+2)
=
1
3
( Irms
(
i
)
+ Irms
(
i
+1)
+ Irms
(
i
+2)
)
RMS equivalent
of average
rectified current
value
Imn
( i )
=
Imn
( i )( i +1)
=
1
2
( Imn
( i )
+ Imn
( i +1)
) Imn
( i )( i +1)( i +2)
=
1
3
( Imn
( i )
+ Imn
( i +1)
+ Imn
( i +2)
)
Current AC
component
Iac
( i )
=
( )
Irms dc
2
)
2
( ) (
Current simple
average
Idc
( i )
=
Current
fundamental
wave component
Harmonic current I
1(
i
)
in harmonic equation
Current peak
Ipk +
(
i
)
= I
(i)s
maximum of M data points
Ipk −
( i )
= I
( i ) s
maximum of M data points
Total current
harmonic
distortion
Ithd
( i )
in harmonic equation
Current ripple
factor
Ipk +
Idc
× 100
2
) ( ) (
) ( ) ( ) ( ) (
Current phase
angle
θI
1( i )
in harmonic equation
Current
unbalance rate
Iunb
( i )( i +1)( i +2)
=
1− 3 − 6
1+ 3 − 6
× 100
β
β
β =
+ +
) (
I I I
( i )( i +1)
2
( i +1)( i +2)
2
( i +2)( i )
2
2
+ +
I I I
( i )( i +1)
4
( i +1)( i +2)
4
( i +2)( i )
4
Example: When Ch. 1 to Ch. 3 are used
β =
+ +
+ +
( )
I I I
I I I
12
4
23
4
31
4
12
2
23
2
31
2 2
• I
12
, I
23
, and I
31
are fundamental wave voltage
RMS values (line voltage), which are obtained
from harmonic calculation results.
•In 3P3W3M and 3P4W wiring mode, current is
converted to line current before calculation.
( i ) : measurement channel, M : number samples between sync timings, s : sample point number
Specifications
HIOKI PW8001A961-00