7SR220 Settings Guide
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Description Range Default
Gn 79 SEF Prot'n Trip 5
Selects whether the fifth sensitive earth fault trip is
Instantaneous or Delayed. When set to Delayed all SEF Inst
Trips will be Inhibited for this shot.
Inst, Delayed Delayed
Gn 79 SEF Delayed Trips To Lockout
Selects how many Delayed trips are allowed before going to
Lockout
1, 2, 3, 4, 5 5
3.11.2.4. Extern Shots
Description Range Default
Gn 79 Extern Prot'n Trip 1
Selects whether the first external trip is Instantaneous or
Delayed
Not Blocked, Blocked Not Blocked
Gn 79 Extern Deadtime 1
Time period between the fault being cleared and the close
pulse being issued
0, 0.1 ... 14300, 14400 5 s
Gn 79 Extern Prot'n Trip 2
Selects whether the second external trip is Instantaneous or
Delayed
Not Blocked, Blocked Not Blocked
Gn 79 Extern Deadtime 2
Time period between the fault being cleared and the close
pulse being issued
0, 0.1 ... 14300, 14400 5 s
Gn 79 Extern Prot'n Trip 3
Selects whether the third external trip is Instantaneous or
Delayed
Not Blocked, Blocked Not Blocked
Gn 79 Extern Deadtime 3
Time period between the fault being cleared and the close
pulse being issued
0, 0.1 ... 14300, 14400 5 s
Gn 79 Extern Prot'n Trip 4
Selects whether the fourth external trip is Instantaneous or
Delayed
Not Blocked, Blocked Not Blocked
Gn 79 Extern Deadtime 4
Time period between the fault being cleared and the close
pulse being issued
0, 0.1 ... 14300, 14400 5 s
Gn 79 Extern Prot'n Trip 5
Selects whether the fifth external trip is Instantaneous or
Delayed
Not Blocked, Blocked Not Blocked
Gn 79 Extern Trips To Lockout
Selects how many external trips are allowed before going to
Lockout
1, 2, 3, 4, 5 5
3.11.3. Synchronising Check
Description Range Default
Gn 25 Sync Voltages V
an
, V
bn
, V
cn
, V
ab
, V
bc
, V
ca
V
bn
Gn 25 Dead Line 0 % to 150 % 20 %
Gn 25 Live Line 0 % to 150 % 90 %
Gn 25 Dead Bus 0 % to 150 % 20 %
Gn 25 Live Bus 0 % to 150 % 90 %
Gn 25 Line U/V Disabled, Enabled Enabled
Gn 25 Line Undervolts 0 % to 150 % 90%
Gn 25 Bus U/V Disabled, Enabled Enabled
Gn 25 Bus Undervolts 0 % to 150 % 90%
Gn 25 Voltage Diff Disabled, Enabled Enabled
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