24
a)
Bidirectional meter +R/-R or IRI - Absolute meter
If the direction of the energy of at least one phase deviates from the energy
direction of the phase sum, the symbol of the relevant phase flashes.
Example:
Case for reactive energy
Display
R
Sum
> 0, R
2
< 0
+R is registered
+Q, L1, L2 and L3 static
R
Sum
< 0, R
3
> 0
-R is registered
-Q, L1, L2 and L3 static
R
Sum
> 0, R
1
und R
3
< 0
+R is registered
-Q, L1, L2 and L3 static
7. Phase failure recognition
The ITZ registers the date and time of the voltage failures and also the date and
time of the voltage return for every phase in the following registers:
Voltage failure
Voltage return
L1
L2
L3
L1
L2
L3
C.51.1*VV
C.51.2*VV
C.51.3*VV
C.52.1*VV
C.52.2*VV
C.52.3*VV
VV
Event meter (00-99, 10 pre-values)
Example:
C.51.1*02(00502031250000)
second voltage failure of the phase L1 at 12.50
o’clock on 03.02.2005.
The relevant last time stamp for voltage return, C.52.X*New() is deleted when there
is a voltage failure (entry in C.51.X(*New +1), otherwise the old time stamp is not
plausible.
Furthermore the ITZ registers the number of voltage failures for every phase in the
following register:
Number of voltage failures
L1
L2
L3
C.7.1
C.7.2
C.7.3
