58
10.
10.
10.
10.4
4
4
4 Harmonic
Harmonic
Harmonic
Harmonic Ratio
Ratio
Ratio
Ratio for
for
for
for Current
Current
Current
Current
PMAC770 measures up to 31
st
current harmonic. Users can read 2~31
st
current
harmonic (%) from the LCD or communication. For example, the data is 10.00, the
actual harmonic value is 10.00%
10.
10.
10.
10.5
5
5
5 Voltage
Voltage
Voltage
Voltage Crest
Crest
Crest
Crest Factor
Factor
Factor
Factor
PMAC770 measures 3 phase voltage crest factor, data resolution: 0.001. If no
voltage input, the CF value is 0. Users can read CF value from the LCD or
communication.
Crest Factor Formula:
In the formula,
U
U
U
U
h
h
h
h
is the
h
h
h
h
harmonic RMS,
U
U
U
U
1
1
1
1
is fundamental harmonic RMS.
N
N
N
N
is the
highest order harmonic.
10.6
10.6
10.6
10.6 Current
Current
Current
Current K
K
K
K Factor
Factor
Factor
Factor
PMAC770 measures 3 phase current K factor, data resolution: 0.001. If no current
input, the K Factor value is 0. Users can read K Factor value from the LCD or
communication.
K Factor Formula:
In the formula,
IIII
h
h
h
h
is the
h
h
h
h
harmonic current ratio,
h
h
h
h
is the harmonic order number,
N
N
N
N
is
the highest order harmonic.
HRW Limited
Ph +852 2546 7402 - Fax +852 2546 7403 - [email protected] - www.hrw.hk