GE L30 Instruction Manual page 364

5.7 CONTROL ELEMENTS
The
VT NEU WIRE OPEN 1 FUNCTION
VT is connected in Delta, do not enabled this function because there is no neutral wire for Delta connected VT.
The
VT NEU WIRE OPEN 1 3 HRAM PKP
WIRE OPEN detection logic to pick up.
SETTING
Function
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 D60, L60, and L90
5
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.
5-228
setting enables and disables the VT neutral wire open detection function. When the
setting specifies the pickup level of 3rd harmonic of 3V0 signal for the VT NEU
VA’, VB’ and VC’ are the
voltage magnitude of one
cycle before
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 5–107: VT FUSE FAIL SCHEME LOGIC
L30 Line Current Differential 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 SETTINGS
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
GE Multilin