Eaton Cutler-Hammer FP 5000 Instruction Leaflet page 142

Table 8.7 Frequency Protection Settings
Parameter Range
81U-1 Under 45 to 65 Hz,
Frequency Disabled
Threshold
81U-1 Under 0 to 9999 Cycles
Frequency
Time Delay
81O-1 Over 45 to 65 Hz,
Frequency Disabled
Threshold
81O-1 Over 0 to 9999 Cycles
Frequency
Time Delay
81U-2 Under 45 to 65 Hz,
Frequency Disabled
Threshold
81U-2 Under 0 to 9999 Cycles
Frequency
Time Delay
81O-2 Over 45 to 65 Hz,
Frequency Disabled
Threshold
81O-2 Over 0 to 9999 Cycles
Frequency
Time Delay
Any Phase V<ε Any Phase V<ε
52a 52a
Any IOC pickups Any IOC pickups
Any phase current Any phase current
> 2 Ipu > 2 Ipu
Residual Current Residual Current
Less than 0.1Ipu Less than 0.1Ipu
V1/ V2 > 40% V1/ V2 > 40%
V0 < ε V0 < ε
Figure 8-11. Loss of Potential
Effective Date: 12/05
FP-5000
Step
0.1 Hz
1 Cycle
0.1 Hz
1 Cycle
0.1 Hz
1 Cycle
0.1 Hz
1 Cycle
For more information visit:
Effective Date: 12/05
LOP LOP
T1 T1 T1
S S S Q Q Q
0 0 0
R R R
T3 T3 T3
0 0 0
www.eatonelectrical.com
IL17569C
Page 8-11
LOPB Enable LOPB Enable
LOPB LOPB
0 0
T2 T2
ε = very small value
Page 8-11