CHAPTER 8: CONTROL POLE DISCORDANCE (52)
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 8–21
CONTACT BASED DETECTION
Range: Disabled, Enabled
Default: Disabled
Selecting “Enabled” enables the PH A(B,C) OPEN and PH A(B,C) CLOSED setpoints
associated with contact-based PD detection.
PH A(B,C) OPEN
Range: Off, On, Any FlexLogic operand
Default: Off
This setpoint provides selection of the FlexLogic operand per phase (pole) to detect the
Open status of the breaker phase (pole). Normally, selection of the contact input wired to
the pole auxiliary contact 52b is selected. This setpoint applies only if CONTACT BASED
DETECTION is set to “Enabled”.
PH A(B,C) CLOSED
Range: Off, On, Any FlexLogic operand
Default: Off
This setpoint provides selection of FlexLogic operand per phase (pole) to detect the
Closed status of this breaker phase (pole). Normally, selection of the contact input wired
to the pole auxiliary contact 52a is selected. This setpoint applies only if CONTACT
BASED DETECTION is set to “Enabled”.
FAST PATH:
To get proper functionality when using auxiliary contacts as detection criteria, the primary
contacts must be fully synchronized with the auxiliary contacts of the monitored switching
element. This means primary contacts and auxiliary contacts need to switch
simultaneously!
CURRENT BASED DETECTION
Range: Disabled, Enabled
Default: Disabled
Selecting “Enabled” enables the setpoint CURRENT LIMIT, associated with current-based
PD detection.
SIGNAL INPUT
Range: Dependant upon order code
Default: CT Bank 1-J1
This setpoint selects a CT bank for the phase currents associated with the monitored
breaker. The phase currents are used only if CURRENT BASED DETECTION is set to
“Enabled”.
CURRENT LIMIT
Range: 0.050 to 1.000 x CT in steps of 0.001 x CT
Default: 0.100 x CT
This setting sets the threshold for the measured phase currents per breaker pole, above
which the pole is considered closed, and below which the pole is detected open. This
setpoint applies only if CURRENT BASED DETECTION is set to “Enabled”.
BLOCK
Range: Off, On, Any FlexLogic operand
Default: Off
The Pole Discordance is blocked, when the selected operand is asserted.
FAST PATH:
Block the Pole Discordance element during single-pole breaker reclosing, as the status of
the three breaker poles creates conditions for pole discordance operation.
OUTPUT RELAY X
For details see Common Setpoints
.
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