GE L60, Инструкция по эксплуатации, Страница: 278 / 498

5-186 L60 Line Phase Comparison Relay 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..
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
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(s).
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).
The
OPEN POLE REM CURR PKP
setting specifies pickup level for the remote-end current estimated by the relay as the local
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
FlexLogic™ operand).
For convenience, the position of the breaker poles defined in the Breaker Control feature and available as FlexLogic™
operand
BREAKER 1/2
Φ
A CLSD
through
BREAKER 1/2
Φ
C CLSD
and
BREAKER 1/2 OOS
are used by the Open Pole feature.
For correct operation of the Open Pole Detector, the Breaker Control, Trip Output, and Single Pole Autoreclose features
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
Ω
in steps of 0.001
MESSAGE
OPEN POLE LINE XC0:
9999.9
Ω
Range: 300.0 to 9999.9
Ω
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 TARGET:
Self-Reset
Range: Self-Reset, Latched, Disabled
MESSAGE
OPEN POLE EVENTS:
Disabled
Range: Enabled, Disabled