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5-180
L60 Line Phase Comparison Relay
GE Multilin
5.6 CONTROL ELEMENTS
5 SETTINGS
5
The detection of the breaker flashover is based on the following condition:
1.
Breaker open,
2.
Voltage drop measured from either side of the breaker during the flashover period,
3.
Voltage difference drop, and
4.
Measured flashover current through the breaker.
Furthermore, the scheme is applicable for cases where either one or two sets of three-phase voltages are available across
the breaker.
THREE VT BREAKER FLASHOVER APPLICATION
When only one set of VTs is available across the breaker, the
BRK FLSHOVR SIDE 2 SRC
setting should be “None”. To detect
an open breaker condition in this application, the scheme checks if the per-phase voltages were recovered (picked up), the
status of the breaker is open (contact input indicating the breaker status is off), and no flashover current is flowing. A con-
tact showing the breaker status must be provided to the relay. The voltage difference will not be considered as a condition
for open breaker in this part of the logic.
Voltages must be present prior to flashover conditions. If the three VTs are placed after the breaker on the
line (or feeder), and the downstream breaker is open, the measured voltage would be zero and the flash-
over element will not be initiated.
The flashover detection will reset if the current drops back to zero, the breaker closes, or the selected FlexLogic™ operand
for supervision changes to high. Using supervision through the
BRK FLSHOVR SPV
setting is recommended by selecting a
trip operand that will not allow the flashover element to pickup prior to the trip.
The flashover detection can be used for external alarm, re-tripping the breaker, or energizing the lockout relay.
Consider the following configuration:
The source 1 (SRC1) phase currents are feeder CTs and phase voltages are bus VTs, and Contact Input 1 is set as Breaker
52a contact. The conditions prior to flashover detection are:
1.
52a status = 0
2.
VAg, VBg, or VCg is greater than the pickup setting
3.
IA, IB, IC = 0; no current flows through the breaker
4.
Δ
VA is greater than pickup (not applicable in this scheme)
MESSAGE
BKR 1 FLSHOVR SPV B:
Off
Range: FlexLogic™ operand
MESSAGE
BKR 1 FLSHOVR SPV C:
Off
Range: FlexLogic™ operand
MESSAGE
BKR 1 FLSHOVR BLOCK:
Off
Range: FlexLogic™ operand
MESSAGE
BKR 1 FLSHOVR TAR-
GET: Self-reset
Range: Self-reset, Latched, Disabled
MESSAGE
BKR 1 FLSHOVR
EVENTS: Disabled
Range: Disabled, Enabled
NOTE
842746A1.CDR
Bus VTs
Line/Feeder
Breaker
CTs
Bus
Содержание L60
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Страница 24: ...1 14 L60 Line Phase Comparison Relay GE Multilin 1 5 USING THE RELAY 1 GETTING STARTED 1...
Страница 42: ...2 18 L60 Line Phase Comparison Relay GE Multilin 2 2 SPECIFICATIONS 2 PRODUCT DESCRIPTION 2...
Страница 78: ...3 36 L60 Line Phase Comparison Relay GE Multilin 3 3 DIRECT INPUT OUTPUT COMMUNICATIONS 3 HARDWARE 3...
Страница 368: ...8 28 L60 Line Phase Comparison Relay GE Multilin 8 2 SINGLE POLE TRIPPING 8 THEORY OF OPERATION 8...
Страница 470: ...D 10 L60 Line Phase Comparison Relay GE Multilin D 1 PROTOCOL APPENDIXD D...
Страница 482: ...E 12 L60 Line Phase Comparison Relay GE Multilin E 2 DNP POINT LISTS APPENDIXE E...
Страница 498: ...x L60 Line Phase Comparison Relay GE Multilin INDEX Z ZERO SEQUENCE CORE BALANCE 3 9...