ABB Relion 670 series - Directional Impedance Element for Mho Characteristic and Additional Distance Protection Directional Function for Earth Faults ZDMRDIR (21 D), ZDARDIR; Functionality; Identification

Function Range or value Accuracy
Trip time 22 ms typically IEC 60255-121
Reset ratio 105% typically -
Reset time at 0.5 to 1.5 x
Zreach
Min. = 30 ms
Max. = 45 ms
-
7.4 Directional impedance element for mho characteristic
and additional distance protection directional function
for earth faults ZDMRDIR (21D), ZDARDIR
SEMOD154813-1 v3
7.4.1 Identification
SEMOD155886-2 v2
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Directional impedance element for
mho characteristic
ZDMRDIR
S00346 V1 EN-US
21D
7.4.2 Functionality
SEMOD154885-5 v9
The phase-to-ground impedance elements can be supervised by a phase unselective directional
function based on symmetrical components (option).
7.4.3 Function block
SEMOD155551-4 v5
ANSI06000422-2-en.vsd
ZDMRDIR (21D)
I3P*
V3P*
DIR_CURR
DIR_VOLT
DIR_POL
PUFW
PUREV
STDIRCND
ANSI06000422 V2 EN-US
Figure 111: ZDMRDIR (21D) function block
7.4.4 Signals
PID-3546-INPUTSIGNALS v6
Table 105: ZDMRDIR (21D) Input signals
Name
Type Default Description
I3P GROUP
SIGNAL
- Group signal for current input
V3P GROUP
SIGNAL
- Group signal for voltage input
1MRK 502 066-UUS B Section 7
Impedance protection
235
Technical manual