GE Industrial Solutions WavePro Low-Voltage Power Circuit Breakers - Manual (Page 26)

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units
Chapter 2. Setup Mode
18
Figure 26. Trip Unit display for current-unbalance relay delay.
Undervoltage Relay Pickup
This function measures the true rms voltage in all phases
and initiates a trip if any phase voltage drops below the set
point. The range of set points is 50 to 90% of the nominal
voltage, with an increment of 1%. The Trip Unit display is
shown in Figure 27.
Figure 27. Trip Unit display for undervoltage relay pickup.
Undervoltage Relay Zero-Volt Trip Enable
This function determines if the relay trips when all three
phase voltages drop to zero volts. The Trip Unit display for
zero-volt trip disabled is shown in Figure 28. The Trip Unit
display for zero-volt trip enabled is shown in Figure 29.
Figure 28. Trip Unit display for undervoltage relay zero-volt trip
disabled.
Figure 29. Trip Unit display for undervoltage relay zero-volt trip
enabled.
Undervoltage Relay Delay
This function sets the delay time before an undervoltage
trip occurs. The range of delays is 1 to 15 seconds, in steps
of 1 second. Choosing
OFF disables undervoltage protec-
tion. The Trip Unit display is shown in Figure 30.
Figure 30. Trip Unit display for undervoltage relay delay.
Overvoltage Relay Pickup
This function measures the true rms voltage in all phases
and initiates a trip if any phase voltage exceeds the set
point. The range of set points is 110 to 150% of the nomi-
nal voltage, with an increment of 1%. The Trip Unit dis-
play is shown in Figure 31.
Figure 31. Trip Unit display for overvoltage relay pickup.
Overvoltage Relay Delay
This function sets the delay time before an overvoltage trip
occurs. The range of delays is 1 to 15 seconds, in steps of 1
second. Choosing
OFF disables overvoltage protection. The
Trip Unit display is shown in Figure 32.
Figure 32. Trip Unit display for overvoltage relay delay.
Power-Reversal Relay Pickup
This function measures the direction of power flow
through the breaker and initiates a trip if a sufficient
magnitude of reverse power is detected. The range of set