a>b
a
b
Counter
Rst
CU
CV
X
q
-1
÷
÷
R I
R I
a>b
a
b
0
Counter
Rst
CU
CV
q
-1
EAFPULSE
RSTACC
EAFACC
T
F
t
tOff
TP
0
q
-1
tEnergyOffPls
1000 GWh
EAFAccPlsQty
tEnergyOnPls
q
-1
= unit delay
IEC13000188-5-en.vsdx
IEC13000188 V5 EN-US
Figure 580: 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 581 shows the logic 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.
Average Power
Calculation
X
a>b
a
b
q
-1
T
F
0.0
tEnergy
EALim
P (ACTIVE FORWARD)
RSTMAXD
EAFALM
MAXPAFD
MAX
IEC13000189-4-en.vsd
q
-1
= unit delay
IEC13000189 V4 EN-US
Figure 581: Logic for maximum power demand calculation and energy alarm
1MRK 502 066-UUS B Section 17
Metering
1111
Technical manual
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