KYORITSU 6315 Instruction Manual - Manual (Page 140)

KEW6315 Items to be calculated
KEW6315 - 138 -
Power factor: PF
Display range -1.000 to 0.000 to 1.000
Accuracy ±1dgt against each calculated value (for sum : ±3dgt)
Sign
－ : leading phase
＋ (no sign) : lagging phase
Harmonics reactive power is calculated per ch, and the polarity sign of the
reversed basic waveform is displayed.
Equation
c
c
c
S
P
sign PF =
sign: Polarity mark, c: Measurement channel
1P2W-1 to 4 PF
1,
PF
2,
PF
3,
PF
4,
PF
sum
1P3W(3P3W)-1
to 2
PF
1,
PF
2,
PF
sum1
PF
3,
PF
4,
PF
sum2
PF
sum
3P3W3A(3P4W) PF
1,
PF
2,
PF
3,
PF
sum
Neutral current An [A]
* only when the wiring configuration is 3P4W.
Range Same as r.m.s. current.
Displayed digit Same as r.m.s. current.
Display area Same as r.m.s. current.
Equation
An＝
( ) { } ( ) { }
2 2
) 1 3 sin( 3 1 2 sin 2 ) 1 3 cos( 3 1 2 cos 2 1
θ θ θ θ θ θ θ θ − + − + − + − +
A A A A A
* θ1,2,3 represent the phase differences between V1 and A1,2 and 3 respectively.
Voltage unbalance ratio Uunb [%]
Displayed digit 5-digit
Display range 0.00% to 100.00%
Wiring 3P3W, 3P4W
Meas. system Complied with IEC61000-4-30
Accuracy ±0.3%: at 50/60Hz, sine wave
(between 0 to 5 % according to IEC61000-4-30)
Equation ( )
( )
100
6 3 1
6 3 1
×








− +
− −
=
β
β
Vumb
( )
2
2
31
2
23
2
12
4
31
4
23
4
12
V V V
V V V
+ +
+ +
= β
* The 1st order components of harmonic voltage are used.
* For 3P4W system, phase voltages are converted to line voltages for
calculation.
V
12
= V
1
- V
2,
V
23
= V
2-
- V
3,
V
31
= V
3
- V
1