GE L90 Instruction Manual page 342

5.6 GROUPED ELEMENTS
• 87L TRIP SEAL-IN: This setting is used to enable/disable seal-in of the trip signal by measurement of the current flow-
ing.
• 87L TRIP SEAL-IN PICKUP: This setting is used to select a pickup setting of the current seal-in function.
SETTING
87L TRIP FUNCTION
= Disabled
= Enabled
SETTING
87L TRIP SOURCE
= Ia
= Ib
= Ic
SETTING
87L TRIP SEAL-IN
= Enabled
FLEXLOGIC OPERAND
87L DIFF OP A
OR
FLEXLOGIC OPERAND
87L RECVD DTT A
FLEXLOGIC OPERAND
87L DIFF OP B
OR
FLEXLOGIC OPERAND
87L RECVD DTT B
5
FLEXLOGIC OPERAND
87L DIFF OP C
OR
FLEXLOGIC OPERAND
87L RECVD DTT C
SETTING
87L TRIP MODE
= 1-Pole
= 3-Pole
SETTING
87L TRIP SUPV
= 50DD SV
FLEXLOGIC OPERANDS
OPEN POLE OP A Φ
OPEN POLE OP B Φ
OPEN POLE OP C Φ
OPEN POLE OP
SETTING
OR
87L TRIP FORCE 3-Φ
= Off
5-206
SETTING
87L TRIP SEAL-IN PICKUP
Ia > PICKUP
Ib > PICKUP
Ic > PICKUP
AND
AND
AND
OR
AND
Figure 5–115: 87L TRIP SCHEME LOGIC
L90 Line Current Differential System
AND
OR
AND
OR
AND
OR
AND
0
AND OR
OR
50
AND
OR
AND
AND OR
AND
AND
5 SETTINGS
FLEXLOGIC OPERAND
87L TRIP OP A
FLEXLOGIC OPERAND
87L TRIP OP B
FLEXLOGIC OPERAND
87L TRIP OP C
FLEXLOGIC OPERAND
87L TRIP OP
OR
XOR
FLEXLOGIC OPERAND
87L TRIP 1P OP
AND
FLEXLOGIC OPERAND
87L TRIP 3P OP
831020A5.CDR
GE Multilin