KYORITSU 6315 Instruction Manual - Manual (Page 149)

Items measured at Harmonics measurement KEW6315
- 147 - KEW6315
Harmonics voltage total distortion factor THDVR [%]
Displayed digit 4-digit
Display range 0.0% - 100.0%
Equation
( )
( ) ∑
∑
=
=
×
=
50
1
2
50
2
2
100
k
k
ck
ck
c
V
V
THDVR
c: Meas. channel
V: Harmonics voltage
k: Harmonics of each order
1P2W-1 to 4 THDVR
1
1P3W-1 to 2 THDVR
1 ,
THDVR
2
3P3W-1 to 2 Line voltage THDVR
12 ,
THDVR
32
3P3W3A Line voltage THDVR
12 ,
THDVR
23 ,
THDVR
31
3P4W THDVR
1 ,
THDVR
2 ,
THDVR
3
Harmonics current total distortion factor THDAR [%]
Displayed digit 4-digit
Display range 0.0% - 100.0%
Equation
( )
( ) ∑
∑
=
=
×
=
50
1
2
50
2
2
100
k
k
ck
ck
c
A
A
THDAR
c: Meas. ch. THDAR
1 ,
THDAR
2 ,
THDAR
3 ,
THDAR
4
A: Harmonics current
k: Harmonics of each order
Harmonics voltage phase angle θVk [deg]
Displayed digit 4-digit
Display range 0.0º to ±180.0º
Equation






−
= −
cki
ckr
ck
V
V
V
1
tan
θ
c: Measurement channel
V: Harmonics voltage
k: Harmonics of each order
r: Real number after FFT conversion,
i: Imaginary number after FFT conversion
1P2W-1 to 4 θV
1 k
1P3W-1 to 2 θV
1k ,
θV
2k
3P3W-1 to 2 θV
12k ,
θV
32k * Line voltages are used.
3P3W3A θV
12k ,
θV
23k ,
θV
31k * Line voltages are used.
3P4W θV
1k ,
θV
2k ,
θV
3k