Figure 4-20. Generator Protection Screen, 59 Tab
3 Phase – 59 Pickup. This setting selects the overvoltage pickup threshold for three-phase generator
connections. A three-phase overvoltage pickup occurs when the average of the three-phase voltage
increases above the 59 pickup setting. a 59 Pickup setting of 70 to 576 Vac may be entered.
3 Phase – 59 Time. This setting selects the length of time between when a three-phase overvoltage
condition is detected and an overvoltage annunciation (trip) occurs. A three-phase 59 Time setting of 0 to
30 seconds may be entered.
3 Phase – 59 Alarm Configuration. This setting selects how a three-phase overvoltage condition is
annunciated. An overvoltage condition can be configured to trigger a pre-alarm, alarm, or no
annunciation.
Single Phase – 59 Pickup. This setting selects the overvoltage pickup threshold for single-phase
generator connections. A single-phase overvoltage pickup occurs when the average of the line-to-line
voltage increases above the 59 pickup setting. a 59 Pickup setting of 70 to 576 Vac may be entered.
Single Phase – 59 Time. This setting selects the length of time between when a single-phase overvoltage
condition is detected and an overvoltage annunciation (trip) occurs. A three-phase 59 Time setting of 0 to
30 seconds may be entered.
Single Phase – 59 Alarm Configuration. This setting selects how a line-to-line overvoltage condition is
annunciated. An overvoltage condition can be configured to trigger a pre-alarm, alarm, or no
annunciation.
81 Tab
The 81 tab contains the underfrequency and overfrequency settings shown in Figure 4-21 and described
in the following paragraphs.
4-18 DGC-500 BESTCOMS Software 9355400990 Rev H
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