Table 3. Protective Relay Functions
Protection
Digitrip 1150/1150i
Step Size
Voltage Protection
Voltage trip protection (Line to Line)
Enable, Disable
Undervoltage trip
Off, 90 - 670 V
1 volt
Undervoltage time
1 - 250 seconds
1 second
Overvoltage trip
Off, 180 - 720 V
1 volt
Overvoltage time
1 - 250 seconds
1 second
Voltage unbalance trip
Off, 5% - 50%
1%
Voltage unbalance time
1 - 250 seconds
1 second
Frequency Protection
Frequency trip protection
Enable, Disable
Underfrequency trip
Off, 45 - 65 Hz
0.1 Hertz
Underfrequency time
0.20 - 5.0 seconds
0.02 seconds
Overfrequency trip
Off, 45 - 65 Hz
0.1 Hertz
Overfrequency time
0.20 - 5.0 seconds
0.02 seconds
Power Quality Protection
Reverse Power Pickup
Off, 1 - 65500 kW
1 kW
Reverse Power Time Delay
1 - 60 seconds
1 second
7
EATON
www.eaton.com
Effective September 2013
Instructional Leaflet IL01301064E
Operating Manual for Series NRX
Digitrip Trip Units 1150 / 1150i
