GE D60 Instruction Manual page 278

5.6 CONTROL ELEMENTS
• BRK FLSHOVR SIDE 2 SRC: This setting specifies a signal source used to provide another set of three phase volt-
ages whenever six (6) VTs are available across the breaker.
• BRK STATUS CLSD A(C): These settings specify FlexLogic™ operands to indicate the open status of the breaker. A
separate FlexLogic™ operand can be selected to detect individual breaker pole status and provide flashover detection.
The recommended setting is 52a breaker contact or another operand defining the breaker poles open status.
• BRK FLSHOVR V PKP: This setting specifies a pickup level for the phase voltages from both sides of the breaker. If 6
VTs are available, opening the breaker leads to two possible combinations – live voltages from only one side of the
breaker, or live voltages from both sides of the breaker. Either case will set the scheme ready for flashover detection
upon detection of voltage above the selected value. Set
• BRK FLSHOVR DIFF V PKP: This setting specifies a pickup level for the phase voltage difference when two VTs per
phase are available across the breaker. The pickup voltage difference should be below the monitored voltage differ-
ence when close or open breaker resistors are left in service. The setting is selected as primary volts difference
between the sources.
• BRK FLSHOVR AMP PKP: This setting specifies the normal load current which can flow through the breaker.
Depending on the flashover protection application, the flashover current can vary from levels of the charging current
when the line is de-energized (all line breakers open), to well above the maximum line (feeder) load (line/feeder con-
nected to load).
• BRK FLSHOVR SPV A(C): This setting specifies a FlexLogic™ operand (per breaker pole) that supervises the opera-
tion of the element per phase. Supervision can be provided by operation of other protection elements, breaker failure,
and close and trip commands. A 6-cycle time delay applies after the selected FlexLogic™ operand resets.
• BRK FLSHOVR PKP DELAY: This setting specifies the time delay to operate after a pickup condition is detected.
5
SETTING
BREAKER FLASHOVER
FUNCTION:
Enable=1
AND
Block: OFF=0
SETTINGS
BRK 1 FLSHOVR SIDE 1
SRC:
SRC 1, SRC 2, ... , SRC 6
VA
VB
VC
IA
IB
IC
SETTINGS
BRK 1 FLSHOVR SIDE 2
SRC:
SRC 1 SRC 2 SRC 6
, , ... , , none
Va
Δ VA =
Vb
Vc
5-188
SETTINGS
BRK 1 FLSHOVR SUPV A:
0
FlexLogic operand: Off=0
Phase B
BRK 1 FLSHOVR SUPV B:
logic
FlexLogic operand: Off=0
Phase C
BRK 1 FLSHOVR SUPV C:
logic
FlexLogic operand: Off=0
SETTING
BRK 1 FLSHOVR V PKP:
RUN
VA > PKP
0
OR
Va > PKP
SETTINGS
5 cycle
BRK 1 STATUS CLSD A:
RUN
FlexLogic operand: On=1
BRK 1 STATUS CLSD B:
Phase B
logic
RUN
FlexLogic operand: On=1
BRK 1 STATUS CLSD C:
Phase C
logic
RUN
FlexLogic operand: On=1
SETTING
BRK 1 FLSHOVR AMP PKP:
RUN
IA > PKP
SETTING
BRK 1 FLSHOVR DIFF V
PKP:
RUN
ΔVA > PKP
| VA - Va |
Figure 5–110: BREAKER FLASHOVER SCHEME LOGIC
D60 Line Distance Relay
to 85 to 90% of the nominal voltage.
BRK FLSHOVR V PKP
6 cycle
AND
SET
5 cycle
dominant
Phase B logic
RESET
0 OR
SET
dominant
RESET
OR
AND
5 SETTINGS
FLEXLOGIC OPERANDS
FLEXLOGIC OPERANDS
BRK 1 FLSHOVR PKP A
BRK 1 FLSHOVR PKP B OR BRK 1 FLSHOVR PKP
BRK 1 FLSHOVR PKP C BRK 1 FLSHOVR DPO
FLEXLOGIC OPERANDS
BRK 1 FLSHOVR DPO A
BRK 1 FLSHOVR DPO B
BRK 1 FLSHOVR DPO C
Phase C logic
SETTING
BRK 1 FLSHOVR PKP
DELAY:
FLEXLOGIC OPERANDS
t
PKP
0 BRK 1 FLSHOVR OP A
FLEXLOGIC OPERAND
Phase B logic BRK 1 FLSHOVR OP B OR BRK 1 FLSHOVR OP
Phase C logic BRK 1 FLSHOVR OP C
GE Multilin
842018A2.CDR