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PROTECTION
4–236
Figure 4-85: A Typical Out-of-step Setting
Path:
Setpoints > Protection > Group 1(6) > Impedance > Out of Step
FUNCTION
Range: Disabled, Trip, ALarm, Latched Alarm, Configurable
Default: Disabled
SIGNAL INPUT
Range: Positive Impedance 1, Positive Impedance 2
Default: Positive Impedance 1
This setting provides the selection for the positive sequence impedance which is
calculated by terminal side or neutral side CT. Positive sequence impedance 1 is
calculated using 3-phase J1 currents and 3-phase J2 voltages. Positive sequence
impedance 2 is calculated using 3-phase K1 currents and 3-phase J2 voltages.
MHO FORWARD REACH
Range: 0.10 to 500.00 ohms in steps of 0.01 ohms
Default: 2.00 ohms
This setting specifies the forward reach of the mho characteristic. The reach impedance
is entered in secondary ohms. The reach impedance angle is fixed to 90 degrees.
MHO REVERSE REACH
Range: 0.10 to 500.00 ohms in steps of 0.01 ohms
Default: 2.00 ohms
This setting specifies the reverse reach of the mho characteristic. The reach impedance
is entered in secondary ohms. The reach impedance angle is fixed to -90 degrees.
RIGHT BLINDER
Range: 0.10 to 500.00 ohms in steps of 0.01 ohms
Default: 2.00 ohms
This setting defines the right blinder position of the blinder characteristic along with the
resistive axis of the impedance plane, expressed ins secondary ohms. The angular
position of the blinder is adjustable with the use of the BLINDERS RCA setting.
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS
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