Over Frequency Threshold
This is the frequency (in hertz) above which a Trip operation will occur. Enter between
50 and 62 Hz, but the setting will be valid only if it falls within the range (System Frequency,
System Frequency + 2). (Minimum: System Frequency; Maximum: System Frequency
+ 2 Hz; Default: System Frequency + 0.5 Hz; Increment: 0.01)
Frequency Time to Trip
This is the time (in seconds) the Under Frequency or Over Frequency Threshold
setting must be exceeded for a Trip operation to occur. (Range: 0.06-600.00; Step: 0.02;
Default: 30.00)
Reset Time
This is the time (in seconds) frequency must be present for the Frequency element to
reset. (Range: 0.06-600.00; Step: 0.02; Default: 1.00)
Good Frequency Indication (Loop Restoration Only)
When the Good-Frequency Indication mode is enabled, a Loop Restoration
Close command will be blocked if the frequency is below the Under Frequency
Threshold setting for the Under Frequency Minimum Time to Detect setting. The
Under Frequency Threshold setting is (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) The Under Frequency Min
Time to Detect setting is (Default: 0.10 s; Maximum: 10.0 s; Increment 0.001)
Under Frequency Enabled
Specify the Yes or No (default) setting.
Under Frequency Threshold
This is the frequency (in hertz) below which a Trip operation will occur. Enter between
47 and 60 Hz, but the setting will be valid only if it falls within the range (System
Frequency - 1, System Frequency). (Minimum: System Frequency - 1 Hz; Maximum:
System Frequency; Default: System Frequency - 0.5 Hz; Increment: 0.01)
Under Minimum Time to Detect
This is the time (in seconds) the Under Frequency Threshold setting must be exceeded
for a Trip operation to occur. (Range: 0.00-10.00; Step: 0.01; Default: 0.01)
108 S&C Instruction Sheet 766-530
Protection Setup
To Next Page
Loading...
Need help?
General
