40
Three phase apparent power
VA
∑
=
Equivalent three phase
Cos
Φ
∑
= W
∑
/ VA
∑
power factor
8.6.3
HARMONIC FORMULAE
Total Harmonic Distortion
THDF V =
or
Factor of Voltage
Total Harmonic Distortion
THDF A =
Factor of Current or
where
V
k
, A
k
= V, I
harmonic of 50/60 Hz fundamental
k = 2, 3,..., 24th harmonic computed by means of a DFT
Cos
∅
fnd = Cosinus of the phase angle between V1 and A1
8.7 PRINTER SPECIFICATIONS
•
Number of columns:
42.
•
Characters:
5x7 matrix
•
Print speed:
1 line per second.
•
Paper:
55g/m
2
pure cellulose smooth.
•
Paper width:
57 mm.
•
Paper length:
16 m.
•
Print functions:
Manual (PRINT key on instrument’s front panel prints out all measurements taken).
Automatic (printouts generated automatically at time intervals of 1 to 99 minutes as programmed on calendar-
clock). Congruity of printed measurements ensured by reference to start of printout time.
8.8 CLAMP METER SPECIFICATIONS
•
Measurement range:
from 0,1 A to 1200 A.
•
Frequency range:
from 30 Hz to 10 kHz.
•
Ratio:
1000A/1Vrms.
•
Accuracy:
200... 1000A
≤
0,5%
≤
0,5° phase angle
50... 200A
≤
0,75%
≤
0,75° phase angle
10... 50A
≤
1,5%
≤
1,5°
phase angle
0,1... 10A
≤
3% + 0,1 mV
2
2
VAr
W
∑
∑
+
rms
V
k
V
24
2
2
∑
rms
k
A
A
24
2
2
∑
1
V
k
V
24
2
2
∑
1
k
A
A
24
2
2
∑
