OPEN POLE REM CURR PKP
current compensated by the calculated charging current. The latter is calculated based on the local voltages and the capac-
itive reactances of the line. This setting is relevant if open pole condition at the remote end of the line is to be sensed and
utilized by the relay (
OPEN POLE REM OP
setting selects the mode of operation of the open pole function. When the "Accelerated" mode is cho-
OPEN POLE MODE
sen, an open pole will be declared ½ cycle after trip output operation and before the breaker pole opens. This blocks dis-
tance loops involved in the faulted phase and phase selector, and arms the trip output to produce three-pole trip for the next
fault. If the fault evolves into multi-phase fault before breaker pole opens for the first fault, the remaining in-service distance
loops would initiate a three-pole trip. When the "Traditional" mode is selected, then an open pole is declared only after the
breaker opens and current disappears. If the fault evolves into a multi-phase fault before the circuit breaker pole opens for
the first fault, the phase selector will change the fault type from a single-line-to-ground fault to a multi-phase fault, thereby
initiating a three-pole trip.
setting selects the signals used to detect an open pole condition. When "I AND V AND CBaux"
OPEN POLE DETECTION
value is selected, the breaker 52 contacts and the current with optional voltage signals are used to determine open pole
conditions. For the "I AND V only" selection, only the current with optional voltage signals are used.
For convenience, the position of the breaker poles defined in the breaker control feature and available as FlexLogic™ oper-
BREAKER 1 ΦA CLSD
V AND CBaux" detection value is selected.
For correct operation of the open pole detector, the breaker control, trip output, and single-pole autoreclose features must
be enabled and configured properly. When used in configuration with only one breaker, the
"Enabled" and the
BREAKER 2 OUT OF SV
for additional details).
setting specifies pickup level for the remote-end current estimated by the relay as the local
BREAKER 1 ΦC CLSD
BREAKER 1 OOS
setting should be "On" (refer to the Breaker Control section earlier in this chapter
L60 Line Phase Comparison System
5.6 CONTROL ELEMENTS
are used by the open pole feature if the "I AND
BREAKER 2 FUNCTION