CHAPTER 4: SETPOINTS CONTROL
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 4–319
Figure 4-142: Pole Discordance detected by the relay
Path: Setpoints > Control > Pole Discordance > Pole Discordance 1(X)
FUNCTION
Range: Disabled, Trip, Alarm, Latched Alarm, Configurable
Default: Disabled
The selection of the Trip, Alarm, Latched Alarm, or Configurable setting enables the
Pole Discordance function.
For details see Common Setpoints
.
BKR TRIP TRIGGER
Range: Off, Any FlexLogic operand
Default: Off
This setting assigns the breaker trip (open) initiation signal.
BKR CLOSE TRIGGER
Range: Off, Any FlexLogic operand
Default: Off
This setting assigns the breaker close initiation signal.
EXTERNAL POLE DISCORDANCE
Range: Off, On, Any FlexLogic operand
Default: Off
This setpoint selects a FlexLogic operand (typically contact input) as an input from pole
discordance detected externally by arranging the breaker auxiliary contacts.
PICKUP DELAY
Range: 0.100 to 6000.000 s in steps of 0.001 s
Default: 2.000 s
This setting provides the definite time pickup delay. If, during a breaker open action, all
three poles are detected open before the timer expires, the timer resets and no pole
discordance is declared. If, however, one or two of the poles remain closed after the
timer expires, pole discordance is declared. The same logic applies when a close
command is send to the breaker, by monitoring the closed status of the breaker poles.
FAST PATH:
Even though the minimum Pickup Delay of 100 ms from the range serves most breakers
with shorter operating times, make sure to check the breaker operating times, and set the
delay to be longer than these times.
894181A1.cdr
8xx relay
Ia
Ib
Ic
Block
Pole Discordance
BKR Trip Trigger
BKR Close Trigger
Circuit Breaker
52a 52a 52a 52b 52b 52b
To Next Page
Loading...
