Hioki PQ3198 - Page 246

13.8 Calculation Formula
240
-9. Total Harmonic Voltage Distortion Factor (Uthd-F, Uthd-R) and Total Harmonic
Current Distortion Factor (Ithd-F, Ithd-R)
Single Phase 2-wire
1P2W
Single Phase
3-wire
1P3W
3-Phase,
3-Wire,
2-Measurement
3P3W2M
3-Phase,
3-Wire,
3-Measurement
3P3W3M
3-Phase,
4-Wire
3P4W
Uthd-F[%] THDUF1
THDUF4
THDUFc=
THDUF1
THDUF2
THDUF4
THDUF12
THDUF32
THDUF4
THDUF12
THDUF23
THDUF31
THDUF4
THDUF1
THDUF2
THDUF3
THDUF4
• For 3-phase 3-wire connections, indicated values re
present harmonic calculation results obtained
using line voltage.
• The value K in the equation indicates the total number of analyzed orders.
Ithd-F[%] THDIF1
THDIF4
THDIFc=
THDIF1
THDIF2
THDIF4
THDIF1
THDIF2
THDIF4
THDIF1
THDIF2
THDIF3
THDIF4
THDIF1
THDIF2
THDIF3
THDIF4
• The value K in the equation indicates the total number of analyzed orders.
Uthd-R[%] THDUR1
THDUR4
THDURc=
THDUR1
THDUR2
THDUR4
THDUR12
THDUR32
THDUR4
THDUR12
THDUR23
THDUR31
THDUR4
THDUR1
THDUR2
THDUR3
THDUR4
• For 3-phase 3-wire connections, indicated values re
present harmonic calculation results obtained
using line voltage.
• The value K in the equation indicates the total number of analyzed orders.
Ithd-R[%] THDIR1
THDIR4
THDIRc=
THDIR1
THDIR2
THDIR4
THDIR1
THDIR2
THDIR4
THDIR1
THDIR2
THDIR3
THDIR4
THDIR1
THDIR2
THDIR3
THDIR4
• The value K in the equation indicates the total number of analyzed orders.
Phase System
Items
U
ck
()
2
k2=
K

U
c1
------------------------------
100×
I
ck
()
2
k2=
K

I
c1
------------------------------
100×
U
ck
()
2
k2=
K

U
ck
()
2
k1=
K

------------------------------
100×
I
ck
()
2
k2=
K

I
ck
()
2
k1=
K

------------------------------
100×
HIOKI PQ3198A961-02