ALL-TEST PRO ATPOL II, Руководство пользователя

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For instance, if the average power factor of Phase 3 is
desired, press: [Power Factor] (to display PF
1
),
[Power Factor] (to display PF
2
), [Power Factor] (to
display PF
3
), [More...] (to display maximum PF
3
),
[More...] (to display minimum PF
3
), and then [More...]
(to display average PF
3
).
In this way, by combining the [Power Factor] and
[More...] keys, there are 16 true power factor
measurements available.
The display of true power factor gives an indication if
current may be leading or lagging voltage. For
instance, if current lags voltage in phase 1, the display
will read "(V
1N
, I
1
)". If current leads voltage, the
display reverses the order and reads "( I
1
, V
1N
)". If
voltage and current are roughly in phase, the
indication may switch back and forth regularly.
To get a definite indication of whether current is lagging, you need to measure displacement power
factor.
Displacement P.F. and Phase Measurements in ATPOL II
ATPOL II performs all commonly desired displacement power factor measurements. The displacement
power factors of phases 1, 2, and 3 can be displayed. To view displacement power factor, press
[Power Factor]. If the display says “Displacement P.F.”, then pressing [Power Factor] repeatedly will
allow you to view the displacement power factors of
phases 1, 2, and 3. If the display says
“True P.F.”
then press [Power Factor] four more times until it says
“Displacement P.F.”. The sequence of the display is
DPF
1
> DPF
2
> DPF
3
> TPF
1
> TPF
2
> TPF
3
> TPF
T
.
If you wish to know the actual phase lag of current, in
degrees, press [More]. For instance, if you wanted to
see how much the phase 3 current lags behind the
phase 3 voltage, press [Power Factor] to display DPF
1
,
[Power Factor] to display DPF
2
, [Power Factor] to
display DPF
3
, and then [More…] to display the phase
lag of phase 3.
In this way, by combining the [Power Factor] and [More...] keys, there are 6 displacement power factor
and phase angle measurements available.
The display of power factor tells you if current is leading or lagging voltage. For instance, if current lags
voltage in phase 1, the display will read "( V
1N
, I
1
)". If current leads voltage, the display reverses the
order and reads "( I
1
, V
1N
)". Determining whether current is leading or lagging is necessary when
correcting power factor by using capacitance.