GE C70 Instruction Manual page 367

CHAPTER 5: SETTINGS
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
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.
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 is zero and the flashover element is not
NOTE initiated.
C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL
BKR 1 FLSHOVR SIDE 1

SRC: SRC 1
BKR 1 FLSHOVR SIDE 2

SRC: None
BKR 1 STATUS CLSD A:

Off

BKR 1 STATUS CLSD C:

Off
BKR 1 FLSHOVR V PKP:

0.850 pu
BKR 1 FLSHOVR DIFF V

PKP: 1000 V
BKR 1 FLSHOVR AMP

PKP: 0.600 pu
BKR 1 FLSHOVR PKP

DELAY: 0.100 s
BKR 1 FLSHOVR SPV A:

Off

BKR 1 FLSHOVR SPV C:

Off
BKR 1 FLSHOVR BLOCK:

Off
BKR 1 FLSHOVR

TARGET: Self-reset
BKR 1 FLSHOVR

EVENTS: Disabled
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
Range: None, SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC
6
Range: FlexLogic operand
Range: FlexLogic operand
Range: 0.000 to 1.500 pu in steps of 0.001
Range: 0 to 100000 V in steps of 1
Range: 0.000 to 1.500 pu in steps of 0.001
Range: 0.000 to 65.535 s in steps of 0.001
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
setting to "None." To detect an
BRK 1 FLSHOVR SIDE 2 SRC
CONTROL ELEMENTS
5
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