ABB Relion 650 Series Technical Manual page 476

Section 11
Metering
470
tEnergyOffPls
EAFACC
a
a>b
1000 GWh
b
÷
÷
EAFAccPlsQty
RSTACC
tEnergyOnPls
-1
q
= unit delay
IEC13000188 V5 EN-US
Figure 225: 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
of alarm for active forward 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 226: 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
X
MAX
1MRK 511 424-UEN B
-1
q
tOff
t
0
T
EAFPULSE
a
TP
a>b
F
b
IEC13000188-5-en.vsdx
226 shows the logic
a
a>b
b
0.0 T
MAXPAFD
F
-1
q
IEC13000189-4-en.vsd
Bay control REC650 2.2 IEC
Technical manual
EAFALM