ABB Relion 670 Series RES670, Technical Manual

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S
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
EALim
EAFAccPlsQty
tEnergyOnPls
IEC13000188-4-en.vsd
q
-1
= unit delay
IEC13000188 V4 EN
Figure 231: 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 232 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
Figure 232: Logic for maximum power demand calculation and energy alarm
Section 17
1MRK 511 365-UUS A
Metering
596 Phasor measurement unit RES670 2.1 ANSI
Technical manual