GE D60 - Page 459

GE Multilin D60 Line Distance Protection System 5-325
5 SETTINGS 5.7 CONTROL ELEMENTS
5
d) PERMISSIVE OVER-REACHING TRANSFER TRIP (POTT)
PATH: SETTINGS  CONTROL ELEMENTS  PILOT SCHEMES  POTT SCHEME
This scheme is primarily intended for two-terminal line applications. The scheme uses an over-reaching Zone 2 distance
element to essentially compare the direction to a fault at both terminals of the line. Ground directional overcurrent functions
available in the relay can be used in conjunction with the Zone 2 distance element to key the scheme and initiate its opera-
tion. This provides increased coverage for high-resistance faults.
 POTT SCHEME

POTT SCHEME
FUNCTION: Disabled
Range: Disabled, Enabled
MESSAGE
POTT SCHEME BLOCK:
Off
Range: FlexLogic operand
MESSAGE
POTT PERMISSIVE
ECHO: Disabled
Range: Disabled, Enabled, Custom
MESSAGE
POTT ECHO COND:
Off
Range: FlexLogic operand
MESSAGE
POTT RX PICKUP
DELAY: 0.000 s
Range: 0.000 to 65.535 s in steps of 0.001
MESSAGE
TRANS BLOCK PICKUP
DELAY: 0.020 s
Range: 0.000 to 65.535 s in steps of 0.001
MESSAGE
TRANS BLOCK RESET
DELAY: 0.090 s
Range: 0.000 to 65.535 s in steps of 0.001
MESSAGE
ECHO DURATION:
0.100 s
Range: 0.000 to 65.535 s in steps of 0.001
MESSAGE
ECHO LOCKOUT:
0.250 s
Range: 0.000 to 65.535 s in steps of 0.001
MESSAGE
LINE END OPEN PICKUP
DELAY: 0.050 s
Range: 0.000 to 65.535 s in steps of 0.001
MESSAGE
POTT SEAL-IN
DELAY: 0.010 s
Range: 0.000 to 65.535 s in steps of 0.001
MESSAGE
GND DIR O/C FWD:
Off
Range: FlexLogic operand
MESSAGE
POTT NO OF COMM
BITS: 1
Range: 1, 2, or 4
MESSAGE
POTT RX1:
Off
Range: FlexLogic operand
MESSAGE
POTT RX2:
Off
Range: FlexLogic operand
MESSAGE
POTT RX3:
Off
Range: FlexLogic operand
MESSAGE
POTT RX4:
Off
Range: FlexLogic operand
MESSAGE
POTT SCHEME TARGET:
Self-Reset
Range: Self-Reset, Latched, Disabled
MESSAGE
POTT SCHEME EVENTS:
Disabled
Range: Disabled, Enabled