R.1.50
SEL-421 Relay Reference Manual Date Code 20111215
Protection Functions
Mho Ground Distance Elements
Table 1.42 Mho Ground Distance Element Settings
Name Description Range
Default
(5 A)
E21MG Mho Phase Distance Protection N, 1 to 5 3
Mho Ground Distance Element Reach
Z1MG Zone 1 () OFF, (0.25–320)/I
nom
6.24
Z2MG Zone 2 () OFF, (0.25–320)/I
nom
9.36
Z3MG Zone 3 () OFF, (0.25–320)/I
nom
1.87
Z4MG Zone 4 () OFF, (0.25–320)/I
nom
OFF
Z5MG Zone 5 () OFF, (0.25–320)/I
nom
OFF
Zero-Sequence Compensation Factor
k0M1 Zone 1 ZSC Factor Magnitude AUTO, 0.000–10 0.726
k0A1 Zone 1 ZSC Factor Angle () –180.00 to +180 –3.69
k0M
a
a
Advanced Setting if EADVS := Y. If the Advanced Settings are not enabled (setting
EADVS := N), the relay hides the settings.
Forward Zones ZSC Factor Magnitude 0.000–10 0.726
k0A
a
Forward Zones ZSC Factor Angle () –180.00 to +180 –3.69
k0MR
a
Reverse Zones ZSC Factor Magnitude 0.000–10 0.726
k0AR
a
Reverse Zones ZSC Factor Angle () –180.00 to +180 –3.69
Table 1.43 Mho Ground Distance Elements Relay Word Bits
Name Description
MAG1 Zone 1 A-phase mho ground distance element
MBG1 Zone 1 B-phase mho ground distance element
MCG1 Zone 1 C-phase mho ground distance element
MAG2 Zone 2 A-phase mho ground distance element
MBG2 Zone 2 B-phase mho ground distance element
MCG2 Zone 2 C-phase mho ground distance element
MAG3 Zone 3 A-phase mho ground distance element
MBG3 Zone 3 B-phase mho ground distance element
MCG3 Zone 3 C-phase mho ground distance element
MAG4 Zone 4 A-phase mho ground distance element
MBG4 Zone 4 B-phase mho ground distance element
MCG4 Zone 4 C-phase mho ground distance element
MAG5 Zone 5 A-phase mho ground distance element
MBG5 Zone 5 B-phase mho ground distance element
MCG5 Zone 5 C-phase mho ground distance element
Z1G Zone 1 ground distance element
Z2G Zone 2 ground distance element
Z3G Zone 3 ground distance element
Z4G Zone 4 ground distance element
Z5G Zone 5 ground distance element
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