GE C70 Instruction Manual page 375

CHAPTER 5: SETTINGS
NEUTRAL WIRE OPEN 1 3 HRAM PKP
logic to pick up.
DETECTION
Base voltage for this element is
of DELTA VTs. The setting is found under
SETTI G
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 OPERA DS
SRC1 50DD OP
OPEN POLE OP
The OPEN POLE OP operand applies
to the D60, L60, and L90
SETTI G
Neutral Wire Open Detect
Enabled = 1
SOURCE 1
3V_0 (3rd Harmonic)
5.8.10.5 Thermal overload protection (ANSI 49)
SETTINGS  CONTROL ELEMENTS  MONITORING ELEMENTS  THERMAL OVERLOAD PROTECTION 
THERMAL PROTECTION 1(2)
 THERMAL
 PROTECTION 1
C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL
— Specifies the pickup level of 3rd harmonic of 3V0 signal for the
setting in the case of WYE VTs and (
PHASE VT SECONDARY
SETTINGS  SYSTEM SETUP  AC INPUTS  VOLTAGE BANK  PHASE VT SECONDARY
Figure 5-134: VT fuse fail logic
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
SETTI G
3 HARM PKP
Run
AND
3V_0 3rd Harm >setting
THERMAL PROTECTION 1

FUNCTION: Disabled
THERMAL PROTECTION 1

SOURCE: SRC1
THERMAL PROTECTION 1

BASE CURR: 0.80 pu
THERMAL PROTECTION 1

k FACTOR: 1.10
PHASE VT SECONDARY
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
Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
Range: 0.20 to 3.00 pu in steps of 0.01
Range: 1.00 to 1.20 in steps of 0.05
CONTROL ELEMENTS
NEUTRAL WIRE OPEN
)/ in case
3
AND
FAULT
OR
FLEXLOGIC OPERA DS
SRC1 VT FUSE FAIL OP
SRC1 VT FUSE FAIL DPO
FLEXLOGIC OPERA D
SRC1 VT FUSE FAIL VOL LOSS
FLEXLOGIC OPERA D
OR
SRC1 VT NEU WIRE OPEN
FLEX-A ALOG
SRC1 3V0 3nd Harmonic
827093AQ.CDR
5-251
.
5