GE L60 Instruction Manual page 310

5.6 CONTROL ELEMENTS
f) OPEN POLE DETECTOR
PATH: SETTINGS CONTROL ELEMENTS
OPEN POLE
5
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.
In two breaker and breaker and a half applications, an open pole condition is declared when:
• both breakers have an open pole on the same phase or
• the current on the line drops below a threshold or
• the current and voltage on the line drop below a threshold.
The Open Pole feature uses signals defined by the
setting. Voltage supervision can be used only with wye VTs on the line side of the breaker(s).
SOURCE
The
OPEN POLE CURRENT PICKUP
The
OPEN POLE LINE XC1
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
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 (
The
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
For convenience, the position of the breaker poles defined in the Breaker Control feature and available as FlexLogic™
operand
BREAKER 1/2 ΦA CLSD
For correct operation of the Open Pole Detector, the Breaker Control, Trip Output, and Single Pole Autoreclose features
5-208
MONITORING ELEMENTS
OPEN POLE FUNCTION:
Disabled
OPEN POLE BLOCK:
MESSAGE
Off
OPEN POLE VOLTAGE
MESSAGE
SUPV: Disabled
OPEN POLE CURRENT
MESSAGE
PKP: 0.050 pu
OPEN POLE LINE XC1:
MESSAGE
9999.9 Ω
OPEN POLE LINE XC0:
MESSAGE
9999.9 Ω
OPEN POLE REM CURR
MESSAGE
PKP: 0.050 pu
OPEN POLE TARGET:
MESSAGE
Self-Reset
OPEN POLE EVENTS:
MESSAGE
Disabled
GROUPED ELEMENTS
setting establishes the current threshold below which an open pole is declared.
setting specifies positive-sequence reactance of the entire line. If shunt reactors are applied, this
setting specifies zero-sequence reactance of the entire line. If shunt reactors are applied, this
FlexLogic™ operand).
OPEN POLE REM OP
setting specifies pickup level for the remote-end current estimated by the relay as the local
FlexLogic™ operand).
through
BREAKER 1/2 ΦC CLSD
L60 Line Phase Comparison Relay
OPEN POLE
Range: Disabled, Enabled
Range: FlexLogic™ operand
Range: Disabled, Enabled
Range: 0.000 to 30.000 pu in steps of 0.001
Range: 300.0 to 9999.9
Range: 300.0 to 9999.9
Range: 0.000 to 30.000 pu in steps of 0.001
Range: Self-Reset, Latched, Disabled
Range: Enabled, Disabled
SETTING GROUP 1(6)
and are used by the Open Pole feature.
BREAKER 1/2 OOS
5 SETTINGS
Ω
in steps of 0.001
Ω
in steps of 0.001
DISTANCE DISTANCE
GE Multilin