ABB RES670 Technical Manual page 612

Section 17
Metering
606
tEnergyOffPls
EAFACC
a
a>b
1000 GWh
b
÷
÷
EAFAccPlsQty
RSTACC
tEnergyOnPls
-1
q
= unit delay
IEC13000188 V5 EN-US
Figure 243: Logic for pulse generation of integrated active forward energy
The maximum demand values for active and reactive power are calculated for the set
time interval tEnergy. The maximum values are updated every minute and stored in a
register available over communication and from outputs MAXPAFD, MAXPARD,
MAXPRFD and MAXPRRD for the active and reactive power forward and reverse
direction. When the RSTDMD input is active from the local HMI reset menu, these
outputs are reset to zero. The energy alarm is activated once the periodic energy value
crosses the energy limit ExLim. Figure
energy exceeds limit and Maximum forward active power demand value. Similarly, the
maximum power calculation and energy alarm outputs in the active reverse, reactive
forward and reactive reverse is implemented.
P (ACTIVE FORWARD)
Average Power
Calculation
tEnergy
EALim
RSTMAXD
-1
q
= unit delay
IEC13000189 V4 EN-US
Figure 244: Logic for maximum power demand calculation and energy alarm
Counter
CU
CV
Rst
-1
R I
q
X

R I
0
Counter
CU
CV
Rst
-1
q
244 shows the logic of alarm for active forward
X
MAX
Phasor measurement unit RES670 2.2 ANSI
1MRK 511 408-UUS A
-1
q
tOff
t
0
T
EAFPULSE
a
TP
a>b
F
b
IEC13000188-5-en.vsdx
a
a>b
b
T
0.0 MAXPAFD
F
-1
q
IEC13000189-4-en.vsd
Technical manual
EAFALM