Micom P634 - Page 138

3.12.6.4 Measured Voltage Values
The measured voltage values are displayed both as per-unit quantities referred
to the nominal quantities of the P634 and as primary quantities. To allow a
display in primary values, the primary nominal voltage of the system transformer
needs to be set in the P634.
64Z8003A
MAIN:
Voltage V p.u.
[ 005 019 ]
MAIN:
Voltage V prim.
[ 005 018 ]
MAIN:
Meas. value rel. V
[ 011 032 ]
MAIN:
Vnom V.T. sec.
[ 010 009 ]
MAIN:
Vnom V.T. prim.
[ 010 002 ]
V
MAIN:
Hardware fault
306 018
MAIN:
General starting
[ 036 000 ]
c
c
Fig. 3-50: Measured voltage value
3.12.6.5 Frequency
The P634 determines the frequency from the voltage. This voltage needs to
exceed a minimum threshold of 0.65 V
nom
in order for frequency to be
determined.
64Z8027A
MAIN:
Frequency f
[ 004 040 ]
MAIN:
Hardware fault
306 018
MAIN:
General starting
[ 036 000 ]
V
>0.65⋅Vnom
c
c
f
Fig. 3-51: Frequency measurement.
3.12.6.6 Angle Determination
The P634 determines the angle between the following currents if the associated
currents exceed the minimum threshold of 0.033 I
nom
:
P634
3 Operation
3-82 P634/EN M/R-42-A // P634‑311‑653