GE L90 Instruction Manual page 204

5.4 SYSTEM SETUP
IRIG-B FAILURE
DETECTED
SETTINGS
BLOCK GPS TIME REF:
Off = 0
IRIG-B SIGNAL TYPE:
None = 0
CHNL ASYM COMP:
Off = 0
DATA FROM REMOTE
TERMINAL 1
87L Ch 1 Status (OK=1)
87L GPS 1 Status (OK=1)
DATA FROM REMOTE
TERMINAL 2
87L Ch 2 Status (OK=1)
87L GPS 2 Status (OK=1)
5
5-68
FLEXLOGIC OPERAND
87L DIFF PFLL FAIL
FLEXLOGIC OPERAND
87L DIFF GPS 1 FAIL
ACTUAL VALUE
Ch1 Asymmetry
ACTUAL VALUE
Ch1 Round Trip Time
FLEXLOGIC OPERAND
87L DIFF GPS 2 FAIL
ACTUAL VALUE
Ch2 Asymmetry
ACTUAL VALUE
Ch2 Round Trip Time
Figure 5–16: CHANNEL ASYMMETRY COMPENSATION LOGIC
L90 Line Current Differential System
5 sec
0
SETTINGS
MAX CHNL ASYMMETRY:
ROUND TRIP TIME
CHANGE:
RUN
Ch1 Asymmetry > MAX
RUN
Ch1 T-Time New -
Ch1 T-Time Old >
CHANGE
RUN
Ch2 Asymmetry > MAX
RUN
Ch2 T-Time New -
Ch2 T-Time Old >
CHANGE
5 SETTINGS
To Remote Relays
Channel 1 and 2
87L GPS Status Fail
FLEXLOGIC OPERAND
87L DIFF GPS FAIL
GPS COMPENSATION
RUN
Use Calculated GPS
Correction
Update GPS Correction
Memory
Use Memorized GPS
Correction
Use GPS Correction
of Zero
FLEXLOGIC OPERAND
87L DIFF 1 MAX ASYM
FLEXLOGIC OPERAND
87L DIFF 1 TIME CHNG
FLEXLOGIC OPERAND
87L DIFF 2 MAX ASYM
FLEXLOGIC OPERAND
87L DIFF 2 TIME CHNG
831025A4.CDR
GE Multilin