Voltage Elements - GE MI-869 Instruction Manual

CHAPTER 4: SETPOINTS

Voltage Elements

Level 1
Phase Reversal
NOTE:
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
Figure 4-70: Voltage Elements Display Hierarchy
Device
System
Inputs
Group 1
Outputs
Group 2
Data Capture
Protection
Group 3
Monitoring
Group 4
Control
Group 5
FlexLogic
Group 6
Testing
Level 2 Level 3
The 869 can detect the phase rotation of the three phase voltages. When all three Phase-
to-Phase Voltages (V , V
ab bc
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 to inhibit starting of a motor.
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.
Motor
Current
Voltage Data Capture
Power
Frequency
Level 4
and V ) are greater than 50% of VT, if the phase rotation of the
ca
PROTECTION
Phase Reversal
Undervoltage Curves
Phase UV
Phase OV
Auxiliary UV
Auxiliary OV
Neutral OV
Neg Seq OV
Volts per Hertz
Impedance>Out-of-Step
Level 5
4–207