GE L90

5-356 L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
CONTROL ELEMENTS CHAPTER 5: SETTINGS
5
5.8.11.3 Breaker flashover
SETTINGS  CONTROL ELEMENTS  MONITORING ELEMENTS  BREAKER FLASHOVER 1(2)
The detection of the breaker flashover is based on the following conditions:
•Breaker open,
• Voltage difference drop, and
• 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, set the BRK 1 FLSHOVR SIDE 2 SRC setting to “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
contact showing the breaker status must be provided to the relay. The voltage difference is not considered as a condition
for open breaker in this part of the logic.
 BREAKER
 FLASHOVER 1

BKR 1 FLSHOVR
FUNCTION: Disabled
Range: Disabled, Enabled

BKR 1 FLSHOVR SIDE 1
SRC: SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4

BKR 1 FLSHOVR SIDE 2
SRC: None
Range: None, SRC 1, SRC 2, SRC 3, SRC 4

BKR 1 STATUS CLSD A:
Off
Range: FlexLogic operand


BKR 1 STATUS CLSD C:
Off
Range: FlexLogic operand

BKR 1 FLSHOVR V PKP:
0.850 pu
Range: 0.004 to 1.500 pu in steps of 0.001

BKR 1 FLSHOVR DIFF V
PKP: 1000 V
Range: 0 to 100000 V in steps of 1

BKR 1 FLSHOVR AMP
PKP: 0.600 pu
Range: 0.020 to 1.500 pu in steps of 0.001

BKR 1 FLSHOVR PKP
DELAY: 0.100 s
Range: 0.000 to 65.535 s in steps of 0.001

BKR 1 FLSHOVR SPV A:
Off
Range: FlexLogic operand


BKR 1 FLSHOVR SPV C:
Off
Range: FlexLogic operand

BKR 1 FLSHOVR BLOCK:
Off
Range: FlexLogic operand

BKR 1 FLSHOVR
TARGET: Self-reset
Range: Self-reset, Latched, Disabled

BKR 1 FLSHOVR
EVENTS: Disabled
Range: Disabled, Enabled