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 is valid only if it falls within the range (System
Frequency - 3, System Frequency). (Minimum: System Frequency - 3 Hz; Maximum: System
Frequency; Default: System Frequency - 0.5 Hz; Increment: 0.02).
The accuracy of the Under Frequency Threshold setpoint at 50 Hz will be
better than or equal to +/- 0.002 Hz for settings above 49.7 Hz. For frequencies below
49.7 Hz, the measurement tolerance increases to a maximum of +/- 0.19 Hz at 47 Hz. See
Figure 51. The accuracy of the Under Frequency Threshold setpoint at
60 Hz will be better than or equal to +/- 0.002 Hz for settings above 59.6 Hz. For frequen-
cies below 59.6 Hz, the measurement tolerance increases to a maximum of +/- 0.15 Hz at
57 Hz. See Figure 52.
Figure 52. Under Frequency Threshold accuracy at 60 Hz.
Figure 51. Under Frequency Threshold accuracy at 50 Hz.
S&C Instruction Sheet 766-530 85
Protection Setup
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