GE L90 Instruction Manual page 607

CHAPTER 5: SETTINGS
5.8.12.5 Permissive over-reaching transfer trip (POTT1)
SETTINGS  CONTROL ELEMENTS  PILOT SCHEMES  POTT1 SCHEME
 POTT 1 SCHEME

The POTT1 pilot scheme operates the same way as the POTT scheme, except hard-coded connections to phase and
ground distance elements are removed to allow the user to choose directional elements, for example ground OC
directional elements. This allows a user to apply the POTT1 scheme using solely directional elements to achieve better
coordination, rather than mixing distance and ground OC directional elements together.
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
POTT1 SCHEME

FUNCTION: Disabled
POTT1 SCHEME BLOCK:

Off
POTT1 PERMISSIVE

ECHO: Disabled
POTT1 ECHO COND:

Off
POTT1 RX PICKUP

DELAY: 0.000 s
TRANS BLOCK PICKUP

DELAY: 0.020 s
TRANS BLOCK RESET

DELAY: 0.090 s
ECHO DURATION:

0.100 s
ECHO LOCKOUT:

0.250 s
LINE END OPEN PICKUP

DELAY: 0.050 s
POTT1 SEAL-IN

DELAY: 0.010 s
DIR FWD1:

Off
DIR FWD2:

Off
DIR FWD3:

Off
POTT1 NO OF COMM

BITS: 1
POTT1 RX1:

Off
POTT1 RX2:

Off
POTT1 RX3:

Off
POTT1 RX4:

Off
POTT1 SCHEME TARGET:

Self-Reset
POTT1 SCHEME EVENT:

Disabled
Range: Disabled, Enabled
Range: FlexLogic operand
Range: Disabled, Enabled, Custom
Range: FlexLogic operand
Range: 0.000 to 65.535 s in steps of 0.001
Range: 0.000 to 65.535 s in steps of 0.001
Range: 0.000 to 65.535 s in steps of 0.001
Range: 0.000 to 65.535 s in steps of 0.001
Range: 0.000 to 65.535 s in steps of 0.001
Range: 0.000 to 65.535 s 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: 1, 2, or 4
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: Self-Reset, Latched, Disabled
Range: Disabled, Enabled
CONTROL ELEMENTS
5
5-383