ABB RELION 670 Series Technical Manual page 1115

1MRK 502 066-UUS B
17.2.7 Operation principle
The instantaneous output values of active and reactive power from the Measurements function
CVMMXN are used and integrated over a selected time
Figure 577
ETPMMTR.
RSTDMD
P
Q
STARTACC
STOPACC
RSTACC
IEC13000185 V2 EN-US
Figure 577: ETPMMTR Functional overview logical diagram
The integration of energy values is enabled by the setting
and STOPACC inputs. If the integration is in progress, the output ACCINPRG is high. Otherwise, it is
low. Figure 578
input is active and the
output ACCINPRG is low even if the integration of energy is enabled. ACCINPRG is deactivated by
activating the STOPACC input.
STOPACC
STARTACC
EnaAcc
RSTACC
-1
q
= unit delay
IEC13000186 V4 EN-US
Figure 578: ACCINPRG Logic diagram
The accumulated energy values (in MWh and MVArh) are available as service values and also as
pulsed output depending on the
Accumulated energy outputs are available for forward as well as reverse direction. The
accumulated energy values can be reset to initial accumulated energy values (
the local HMI reset menu or with the input signal RSTACC.
integration of energy in active forward direction. Similarly, the integration of energy in active
reverse, reactive forward and reactive reverse is done.
Technical manual
shows the overall functionality of the energy calculation and demand handling function
Zero Clamping
Detection
shows the logic of the ACCINPRG output. ACCINPRG is active when the STARTACC
EnaAcc setting is enabled. When the RSTACC input is in the active state, the
³1
ExxAccPlsQty setting, which can be connected to a pulse counter.
tEnergy to measure the integrated energy.
Maximum Power
Demand Calculation
Energy Accumulation
Calculation
EnaAcc and controlled by the STARTACC
FALSE
T
&
F
-1
q
Figure 579
GUID-4A46757C-EC5D-4BCE-9D09-C8152B062CE1 v2
MAXPAFD
MAXPARD
MAXPRFD
MAXPRRD
EAFALM
EARALM
ERFALM
ERRALM
ACCINPRG
EAFPULSE
EARPULSE
ERFPULSE
ERRPULSE
EAFACC
EARACC
ERFACC
ERRACC
IEC13000185-2-en.vsd
ACCINPRG
&
IEC13000186-4-en.vsd
ExxPrestVal ) from
shows the logic for
Section 17
Metering
1109