Good Frequency Indication (only for the IntelliTeam SG system or Loop
Restoration)
Loop Restoration:
When the
Good Frequency Indication
mode is enabled, a
Loop
Restoration Close
command will be blocked if the frequency is below the configured
Under Frequency Threshold
setpoint for the
Under Frequency Minimum Time
to Detect
setpoint. The
Under Frequency Threshold
setpoint is calculated as:
(Default :System Frequency – 0.5 Hz, 49.50 Hz when
Setup>General Site-Related>System
Frequency
= 50 Hz, or 59.50 Hz when
Setup>General Site-Related>System Frequency
= 60 Hz; Minimum: System Frequency – 1 Hz; Maximum: System Frequency; Increment:
0.01 Hz) Configure the
Under Frequency Minimum Time to Detect
setpoint. (Range:
6-16,000; Step: 1; Default: 0.10 s)
IntelliTeam SG system:
When the
Good Frequency Indication
mode is enabled,
and the
Good Frequency Indication
element identifies an under-frequency load-shed
event (the under frequency is at or below the
Under Frequency Threshold
setting for
the
Under Frequency Minimum Time to Detect
settings of the
Good Frequency
Indication
mode), it will set the IntelliTeam SG system to the
Prohibit Restoration
mode, which also causes the IntelliRupter fault interrupter to go into an
Out of Ready
state at that location). When an IntelliRupter fault interrupter is in the
Out of Ready
state, manually enable restoration for each IntelliRupter fault interrupter and return the
IntelliTeam SG system to its
Normal
state.
Under Frequency Enabled
Specify the
Yes
or
No
(default) option.
Under Frequency Threshold
This is the frequency (in hertz) below which a Loop Restoration
Close
command will be
blocked or the IntelliTeam SG system will be set to the
Prohibit Restoration
state. Enter
between 47 and 60 Hz, but the setting will be valid only if it falls within the Range: System
Frequency – 1 to System Frequency; Minimum: System Frequency - 1 Hz; Maximum:
System Frequency; Default: System Frequency - 0.5 Hz; Increment: 0.01)
Under Frequency Minimum Time to Detect
This is the time (in seconds) the
Under Frequency Threshold
setting must be exceeded
for a
Loop Restoration
Close
command to be blocked, or the IntelliTeam SG system
to be set to the
Prohibit Restoration
state. (Range: 0.00-10.00; Step: 0.01; Default: 0.01)
Reset Time
This is the time (in seconds) good frequency must be present for the
Frequency
element
to reset. (Range: 0.06-600.00, Step: 0.02, Default: 1.00)
S&C Instruction Sheet 766-530 97
Protection Setup