GE Multilin L60, Instruction Manual

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5-278 L60 Line Phase Comparison System GE Multilin
5.6 CONTROL ELEMENTS 5 SETTINGS
5
f) OPEN POLE DETECTOR
PATH: SETTINGS

CONTROL ELEMENTS

MONITORING ELEMENTS

OPEN POLE
The open pole detector is intended to identify an open pole of the line circuit breaker. The scheme monitors the breakers
auxiliary contacts, current in the circuit and optionally voltage on the line. The scheme generates output operands used to
block the phase selector and some specific protection elements, thus preventing maloperation during the dead time of a
single-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 following
hold:
• 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

SETTING GROUP 1(6)

DISTANCE

DISTANCE
SOURCE
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, this
value should be a net capacitive reactance of the line and the reactors installed between the line breakers. The value is
entered in secondary ohms. This setting is relevant if open pole condition at the remote end of the line is to be sensed and
utilized by the relay.
The
OPEN POLE LINE XC0
setting specifies zero-sequence reactance of the entire line. If shunt reactors are applied, this
value should be a net capacitive reactance of the line and the reactors installed between the line breakers. The value shall
be entered in secondary ohms. 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
FlexLogic operand).

OPEN POLE

OPEN POLE FUNCTION:
Disabled
Range: Disabled, Enabled
MESSAGE
OPEN POLE BLOCK:
Off
Range: FlexLogic operand
MESSAGE
OPEN POLE VOLTAGE
SUPV: Disabled
Range: Disabled, Enabled
MESSAGE
OPEN POLE CURRENT
PKP: 0.050 pu
Range: 0.000 to 30.000 pu in steps of 0.001
MESSAGE
OPEN POLE LINE XC1:
9999.9
Ω
Range: 300.0 to 9999.9 ohms in steps of 0.001
MESSAGE
OPEN POLE LINE XC0:
9999.9
Ω
Range: 300.0 to 9999.9 ohms in steps of 0.001
MESSAGE
OPEN POLE REM CURR
PKP: 0.050 pu
Range: 0.000 to 30.000 pu in steps of 0.001
MESSAGE
OPEN POLE MODE:
Accelerated
Range: Accelerated, Traditional
MESSAGE
OPEN POLE DETECTION:
I AND V AND CBaux
Range: I AND V AND CBaux, I AND V only
MESSAGE
OPEN POLE TARGET:
Self-Reset
Range: Self-Reset, Latched, Disabled
MESSAGE
OPEN POLE EVENTS:
Disabled
Range: Enabled, Disabled