Figure 4-19. Generator Protection Scree, 27 Tab
3 Phase – 27 Pickup. This setting selects the undervoltage pickup threshold for three-phase generator
connections. A three-phase undervoltage pickup occurs when the average of the three-phase voltage
decreases below the 27 Pickup setting. A three-phase 27 Pickup setting of 70 to 576 Vac may be
entered.
3 Phase – 27 Time. This setting selects the length of time between when a three-phase undervoltage
condition is detected and an undervoltage annunciation (trip) occurs. A three-phase 27 Time setting of 0
to 30 seconds may be entered.
3 Phase – 27 Inhibit. This setting selects the level of underfrequency that will inhibit the three-phase
undervoltage protection function. A three-phase 27 Inhibit setting of 20 to 400 hertz may be entered.
3 Phase – 27 Alarm Configuration. This setting selects how a three-phase undervoltage condition is
annunciated. An undervoltage condition can be configured to trigger a pre-alarm, alarm, or no
annunciation.
Single Phase – 27 Pickup. This setting selects the undervoltage pickup threshold for single-phase
generator connections. A single-phase undervoltage pickup occurs when the average of the line-to-line
voltage decreases below the 27 Pickup setting. A single-phase 27 Pickup setting of 70 to 576 Vac may be
entered.
Single Phase – 27 Time. This setting selects the length of time between when a single-phase
undervoltage condition is detected and an undervoltage annunciation (trip) occurs. A single-phase 27
Time setting of 0 to 30 seconds may be entered.
Single Phase – 27 Inhibit. This setting selects the level of underfrequency that will inhibit the single-phase
undervoltage protection function. A single-phase 27 inhibit setting of 20 to 400 hertz may be entered.
Single Phase – 27 Alarm Configuration. This setting selects how a single-phase undervoltage condition is
annunciated. An undervoltage condition can be configured to trigger a pre-alarm, alarm, or no
annunciation.
59 Tab
The 59 tab contains the overvoltage settings shown in Figure 4-20 and described in the following
paragraphs.
9355400990 Rev H DGC-500 BESTCOMS Software 4-17
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