Parameter Range Zero sequence current
Enable Not enabled, Enabled Not enabled
Action Warning
3.4.14 [Source] over-frequency (ANSI 81O)
Protection IEC symbol (IEC60617) ANSI (IEEE C37.2) IEC 61850 Operate time
Over-frequency f>, f>> 81O PTOF < 100 ms
The alarm response is based on the lowest fundamental frequency (based on phase voltage),
from the source. This ensures that the alarm only activates when all of the phase frequencies
are above the set point.
Configure the parameters under Configure > Parameters > [Source] > Frequency protections > Over-frequency #, where # is 1
or 2.
Table 3.43
Default parameters
Parameter Range Over-frequency 1 Over-frequency 2
Set point 80 to 120 % of nominal frequency 105 % 107 %
Delay 0.00 s to 1 h 5.00 s 3.00 s
Enable Not enabled, Enabled Enabled Enabled
Latch Not enabled, Enabled Not enabled Enabled
Action Warning Block
Table 3.44 Default inhibits
Controller type Inhibit(s)
GENSET Generator breaker closed
EMERGENCY genset Generator breaker closed, Tie breaker closed
SHAFT generator Shaft breaker closed
SHORE connection Shore breaker closed
3.4.15 [Source] under-frequency (ANSI 81U)
Protection
IEC symbol (IEC60617) ANSI (IEEE C37.2) IEC 61850 Operate time
Under-frequency f<, f<< 81U PTUF < 100 ms
DESIGNER'S HANDBOOK 4189340911K UK Page 74 of 521
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