ABB REG670 - Monitored Data

7.4.6 Monitored data
Table 97: ZMFCPDIS Monitored data
Name
Type Values (Range) Unit Description
L1Dir INTEGER 1=Forward
2=Reverse
0=No direction
-
Direction in phase L1
L2Dir INTEGER 1=Forward
2=Reverse
0=No direction
-
Direction in phase L2
L3Dir INTEGER 1=Forward
2=Reverse
0=No direction
-
Direction in phase L3
L1L2Dir INTEGER 1=Forward
2=Reverse
0=No direction
-
Direction in loop L1L2
L2L3Dir INTEGER 1=Forward
2=Reverse
0=No direction
-
Direction in loop L2L3
L3L1Dir INTEGER 1=Forward
2=Reverse
0=No direction
-
Direction in loop L3L1
L1R REAL - Ohm Resistance in phase L1
L1X REAL - Ohm Reactance in phase L1
L2R REAL - Ohm Resistance in phase L2
L2X REAL - Ohm Reactance in phase L2
L3R REAL - Ohm Resistance in phase L3
L3X REAL - Ohm Reactance in phase L3
7.4.7 Operation principle
Settings, input and output names are sometimes mentioned in the following text
without its zone suffix (i.e. BLKZx instead of BLKZ3) when the description is equally
valid for all zones.
7.4.7.1 Filtering
Practically all voltage, current and impedance quantities used within the ZMFCPDIS
function are derived from fundamental frequency phasors filtered by a half-cycle
filter.
The phasor filter is frequency adaptive in the sense that its coefficients are changed
based on the estimated power system frequency.
A half-cycle filter will not be able to reject both even and odd harmonics. So, while
odd harmonics will be completely attenuated, accuracy will be affected by even
harmonics. Even harmonics will not cause the distance zones to overreach; instead
1MRK502052-UEN B Section 7
Impedance protection
237
Technical manual