CHAPTER 4: SETPOINTS PROTECTION
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 4–207
Voltage Elements
Figure 4-70: Voltage Elements Display Hierarchy
Phase Reversal
The 869 can detect the phase rotation of the three phase voltages. When all three Phase-
to-Phase Voltages (V
ab
, V
bc
and V
ca
) are greater than 50% of VT, if the phase rotation of the
three phase voltages is not the same as the Phase Rotation setpoint (programmed under
Setpoints/System/Power System), and there is no fuse failure, either an alarm or a trip will
occur within the programmed Pickup Delay time.
Upon detection of the phase reversal, this element will also issue a Phase Rev Inhibit
operand t
o inhibit starting of a motor.
NOTE:
VT is the secondary voltage programmed under Setpoints > System > Voltage Sensing >
Phase VT Secondary.
Path:
Setpoints > Protection > Group 1(6) > Voltage > Phase Reversal
FUNCTION
Range: Disabled, Trip, Alarm, Latched Alarm, Configurable
Default: Disabled
This setting enables the Phase Reversal functionality.
PICKUP DELAY
Range: 0.00 to 180.00 s in steps of 0.01 s
Default: 1.00 s
This setting specifies the pickup delay of the element.
DROPOUT DELAY
Range: 0.00 to 180.00 s in steps of 0.01 s
Default: 1.00 s
This setting defines the reset delay of the element.
Level 1 Level 2 Level 3 Level 4 Level 5
Setpoints
Device
System
Inputs
Outputs
Protection
Monitoring
Control
FlexLogic
Data Capture
Power
Voltage
Current
Undervoltage Curves
Neutral OV
Phase OV
Neg Seq OV
Auxiliary OV
Data Capture
Group 1
Group 2
Group 3
Group 4
Group 5
Group 6
Frequency
Phase UV
Motor
Testing
Phase Reversal
Auxiliary UV
Volts per Hertz
Impedance>Out-of-Step
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