GE L90 Instruction Manual page 169

5 SETTINGS
The Zone 1 extension philosophy used here normally operates from an under-reaching zone, and uses an overreaching
distance zone when reclosing the line with the other line end open. The
1 extension functionality if external autoreclosure is employed. Another Zone 1 extension approach is to permanently apply
an overreaching zone, and reduce the reach when reclosing. This philosophy can be programmed via the Autoreclose
scheme.
SETTING
SETTING
TERMINAL OPEN:
LINE PICKUP
FUNCTION:
Off=0
Disabled=0
Enabled=1
SETTING
AND
LINE PICKUP
BLOCK:
SETTING
Off=0
LINE PICKUP UV PKP:
SETTING RUN
VAG or VAB < setting
LINE PICKUP SIGNAL
SOURCE:
VBG or VBC < setting
VCG or VCA < setting
VAG VAB
VBG VBC
VCG VCA SETTING
IA IA < 0.05 pu
IB IB < 0.05 pu
IC IC < 0.05 pu
SETTING
PHASE IOC
LINE PICKUP:
RUN
IA > PICKUP
SETTING
IB > PICKUP
AR CO-ORD BYPASS: IC > PICKUP
Disabled=0
Enabled=1
FLEXLOGIC OPERANDS
GND DIST Z2 PKP
OR
PH DIST Z2 PKP
SETTING
AR ACCELERATE:
Off=0
0
OR
FLEXLOGIC OPERANDS
AR CLOSE BKR1
AR CLOSE BKR2
D60 and L90 only
GE Multilin
SETTING
LINE PICKUP OV
PKP DELAY:
t
PKP
OR
SETTINGS
LINE END OPEN
PICKUP DELAY:
LINE END OPEN
RESET DELAY:
t
PKP
OR
AND
AND
AND
OR
OR
6 cycles
Figure 5–37: LINE PICKUP SCHEME LOGIC
L90 Line Differential Relay
5.5 GROUPED ELEMENTS
setting is provided to achieve Zone
AR ACCELERATE
t
RST=0
t
RST
SETTINGS
AR CO-ORD
PICKUP DELAY:
AR CO-ORD RESET
DELAY:
t
PKP
AND t
RST
AND
AND
AND
FLEXLOGIC OPERAND
LINE PICKUP UV PKP
FLEXLOGIC OPERAND
LINE PICKUP LEO PKP
(LEO=Line End Open)
FLEXLOGIC OPERANDS
LINE PICKUP OP
OR
LINE PICKUP PKP
LINE PICKUP DPO
5
FLEXLOGIC OPERANDS
LINE PICKUP RCL TRIP
FLEXLOGIC OPERANDS
LINE PICKUP I< A
LINE PICKUP I< B
LINE PICKUP I< C
837000AC.CDR
5-79