5-242 L90 Line Current Differential System GE Multilin5.7 CONTROL ELEMENTS 5 SETTINGS5g) OPEN POLE DETECTORPATH: SETTINGS ÖØ CONTROL ELEMENTS ÖØ MONITORING ELEMENTS ÖØ OPEN POLEThe open pole detector is intended to identify an open pole of the line circuit breaker. The scheme monitors the breakersauxiliary contacts, current in the circuit and optionally voltage on the line. The scheme generates output operands used toblock the phase selector and some specific protection elements, thus preventing maloperation during the dead time of asingle-pole autoreclose cycle or any other open pole conditions.The scheme declares an open pole at the moment a single-pole trip is issued.In two-breaker and breaker-and-a-half applications, an open pole condition is declared when one or more of the followinghold:• Both breakers have an open pole on the same phase.• The current on the line drops below a threshold.• The current and voltage on the line drop below a threshold.The open pole feature uses signals defined by the GROUPED ELEMENTS Ö SETTING GROUP 1(6) ÖØ DISTANCE Ö DISTANCESOURCE setting. Voltage supervision can be used only with wye VTs on the line side of the breaker.The OPEN POLE CURRENT PICKUP setting establishes the current threshold below which an open pole is declared.The OPEN POLE LINE XC1 setting specifies positive-sequence reactance of the entire line. If shunt reactors are applied, thisvalue should be a net capacitive reactance of the line and the reactors installed between the line breakers. The value isentered in secondary ohms. This setting is relevant if open pole condition at the remote end of the line is to be sensed andutilized by the relay.The OPEN POLE LINE XC0 setting specifies zero-sequence reactance of the entire line. If shunt reactors are applied, thisvalue should be a net capacitive reactance of the line and the reactors installed between the line breakers. The value shallbe entered in secondary ohms. This setting is relevant if open pole condition at the remote end of the line is to be sensedand utilized by the relay ( OPEN POLE REM OP FlexLogic™ operand). OPEN POLEOPEN POLE FUNCTION:DisabledRange: Disabled, EnabledMESSAGE OPEN POLE BLOCK:OffRange: FlexLogic™ operandMESSAGE OPEN POLE VOLTAGESUPV: DisabledRange: Disabled, EnabledMESSAGE OPEN POLE CURRENTPKP: 0.050 puRange: 0.000 to 30.000 pu in steps of 0.001MESSAGE OPEN POLE LINE XC1:9999.9 ΩRange: 300.0 to 9999.9 ohms in steps of 0.001MESSAGE OPEN POLE LINE XC0:9999.9 ΩRange: 300.0 to 9999.9 ohms in steps of 0.001MESSAGE OPEN POLE REM CURRPKP: 0.050 puRange: 0.000 to 30.000 pu in steps of 0.001MESSAGE OPEN POLE MODE:AcceleratedRange: Accelerated, TraditionalMESSAGE OPEN POLE DETECTION:I AND V AND CBauxRange: I AND V AND CBaux, I AND V onlyMESSAGE OPEN POLE TARGET:Self-ResetRange: Self-Reset, Latched, DisabledMESSAGE OPEN POLE EVENTS:DisabledRange: Enabled, Disabled
