GE T60 Instruction Manual page 453

5 SETTINGS
SETTING
VA', VB' and VC' are the
Function voltage magnitude of one
cycle before
Enabled = 1
SOURCE 1
VA
VB
VC
V_2
V_1
I_1
FLEXLOGIC OPERANDS
SRC1 50DD OP
OPEN POLE OP
The OPEN POLE OP operand applies
to the C60, D60, L60, L90, N60
SETTING
Neutral Wire Open Detect
Enabled = 1
SOURCE 1
3V_0 (3rd Harmonic)
Base voltage for this element is PHASE VT SECONDARY setting in the case of WYE VTs and (PHASE VT SECONDARY)/
3 in case of DELTA VTs.
GE Multilin
COMPARATORS
Run
|VA'|-|VA| > 0.2 pu
& |VA'| > 0.8 pu
Run
|VB'|-|VB| > 0.2 pu OR
& |VB'| > 0.8 pu
Run
|VC'|-|VC| > 0.2 pu
& |VC'| > 0.8 pu
Run
V_2 > 0.1 pu
OR
Run
V_1 < 0.05 pu
AND
Run
I_1 > 0.075 pu
Run
TIMER
V_1 < 0.80 pu
2 cycles
Run
AND
I_1 < 0.05 pu
AND
OR
AND
AND
SETTING
3 HARM PKP
Run
AND
3V_0 3rd Harm >setting
Figure 5–155: VT FUSE FAIL SCHEME LOGIC
T60 Transformer Protection System
OR
FUSE
FAIL
TIMER
2 cycles
SET
AND
0
Latch
20 cycles
TIMER
30 cycles
RESET
0
Reset-dominant
TIMER
5 cycles
AND
0
TIMER
0
AND 20 cycles
5.7 CONTROL ELEMENTS
AND
FAULT
OR
FLEXLOGIC OPERANDS
SRC1 VT FUSE FAIL OP
SRC1 VT FUSE FAIL DPO
FLEXLOGIC OPERAND
SRC1 VT FUSE FAIL VOL LOSS
FLEXLOGIC OPERAND
OR
SRC1 VT NEU WIRE OPEN
FLEX-ANALOG
SRC1 3V0 3nd Harmonic
827093AQ.CDR
5-307
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