6.4.5
Settings
Table 45:
ZDARDIR (21D) Group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
PolMode
-3U0
-V2
IPol
Dual
-3U0Comp
-V2comp
-
-
-3U0
Polarization quantity for opt dir function for P-G
faults
AngleRCA
-90 - 90
Deg
1
75
Characteristic relay angle (= MTA or base
angle)
IPickup
5 - 200
%IB
1
5
Minimum operation current in % of IBase
VPolPU
4 - 100
%VB
1
4
Minimum polarizing voltage in % of VBase
IPolPU
5 - 100
%IB
1
10
Minimum polarizing current in % of IBase
Table 46:
ZDARDIR (21D) Group settings (advanced)
Name
Values (Range)
Unit
Step
Default
Description
AngleOp
90 - 180
Deg
1
160
Operation sector angle
Kmag
0.50 - 3000.00
ohm
0.01
40.00
Boost-factor in -V0comp and -V2comp
polarization
Table 47:
ZDARDIR (21D) Non group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
GlobalBaseSelector
1 - 6
-
1
1
Selection of one of the Global Base Value
groups
6.4.6
Operation principle
A Mho element needs a polarizing voltage for its operation. The positive-sequence
memory-polarized elements are generally preferred. The benefits include:
•
The greatest amount of expansion for improved resistive coverage. These elements
always expand back to the source.
•
Memory action for all fault types. This is very important for close-in three-phase
faults.
•
A common polarizing reference for all six distance-measuring loops. This is
important for single-pole tripping, during a pole-open period.
Section 6
1MRK 506 335-UUS A
Impedance protection
162
Technical manual
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