ABB Relion 670 series - Monitored Data; Operation Principle

7.4.6 Monitored data
PID-3546-MONITOREDDATA v5
Table 114: ZDMRDIR (21D) Monitored data
Name Type Values (Range) Unit Description
A_Dir INTEGER 1=Forward
2=Reverse
0=No direction
- Direction in phase A
B_Dir INTEGER 1=Forward
2=Reverse
0=No direction
- Direction in phase B
C_Dir INTEGER 1=Forward
2=Reverse
0=No direction
- Direction in phase C
Aph_R REAL - Ohm Resistance in phase A
Aph_X REAL - Ohm Reactance in phase A
Bph_R REAL - Ohm Resistance in phase B
Bph_X REAL - Ohm Reactance in phase B
Cph_R REAL - Ohm Resistance in phase C
Cph_X REAL - Ohm Reactance in phase C
7.4.7 Operation principle
7.4.7.1 Directional impedance element for mho characteristic ZDMRDIR (21D)
SEMOD154817-5 v7
The evaluation of the directionality takes place in Directional impedance element for mho
characteristic (ZDMRDIR ,21D). Equation
60 and equation 61 are used to classify that the fault is in
the forward direction for phase-to-ground fault and phase-to-phase fault respectively.
0.85 1 0.15 1
Re
V A V AM
AngDir Ang AngNeg s
IA
× + ×
- < <
EQUATION1618 V1 EN-US (Equation 60)
0.85 1 0.15 1
Re
V AB V ABM
AngDir Ang AngNeg s
IAB
× + ×
- < <
EQUATION1620 V1 EN-US (Equation 61)
Where:
AngDir Setting for the lower boundary of the forward directional characteristic, by
default set to 15 (= -15 degrees)
AngNegRes Setting for the upper boundary of the forward directional characteristic, by
default set to 115 degrees, see figure 112 for mho characteristics.
V1A Positive sequence phase voltage in phase A
V1AM Positive sequence memorized phase voltage in phase A
Table continues on next page
Section 7 1MRK 502 066-UUS B
Impedance protection
238
Technical manual