CHAPTER 2: PRODUCT DESCRIPTION
SPECIFICATIONS
F35 MULTIPLE FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
2-21
2
Reset delay:
0.000 to 65.535 s in steps of 0.001
INCIPIENT CABLE FAULT DETECTION
Principle:
detection of ½ cycle or less overcurrent condition during normal load
Availability:
two per CT/VT module (not including 8Z modules)
Pickup level:
0.1 to 10.00 pu in steps of 0.01
Reset delay:
0.000 to 65.535 s in steps of 0.001
Operating mode:
number of counts, counts per time window
AUTORECLOSURE
Single breaker applications, 3-pole tripping schemes
Up to four reclose attempts before lockout
Independent dead time setting before each shot
Possibility of changing protection settings after each shot with FlexLogic
THERMAL OVERLOAD PROTECTION
Thermal overload curves:
IEC 255-8 curve
Base current:
0.20 to 3.00 pu in steps of 0.01
Overload (k) factor:
1.00 to 1.20 pu in steps of 0.05
Trip time constant:
0 to 1000 min. in steps of 1
Reset time constant:
0 to 1000 min. in steps of 1
Minimum reset time:
0 to 1000 min. in steps of 1
Timer accuracy (cold curve):
±100 ms or 2%, whichever is greater
Timer accuracy (hot curve):
±500 ms or 2%, whichever is greater for I
p
< 0.9 × k × I
b
and I / (k × I
b
) > 1.1
TRIP BUS (TRIP WITHOUT FLEXLOGIC)
Number of elements:
6
Number of inputs:
16
Operate time:
<2 ms at 60 Hz
Timer accuracy:
±3% or 10 ms, whichever is greater
2.5.2 User-programmable elements
FLEXLOGIC
Programming language:
Reverse Polish Notation with graphical visualization (keypad programmable)
Lines of code:
1024
Internal variables:
64
Supported operations:
NOT, XOR, OR (2 to 16 inputs), AND (2 to 16 inputs), NOR (2 to 16 inputs), NAND (2 to 16 inputs),
latch (reset-dominant), edge detectors, timers
Inputs:
any logical variable, contact, or virtual input
Number of timers:
32
Pickup delay:
0 to 60000 (ms, sec., min.) in steps of 1
Dropout delay:
0 to 60000 (ms, sec., min.) in steps of 1
FLEXCURVES™
Number:
4 (A through D)
Reset points:
40 (0 through 1 of pickup)
Operate points:
80 (1 through 20 of pickup)
Time delay:
0 to 65535 ms in steps of 1
FLEX STATES
Number:
up to 256 logical variables grouped under 16 Modbus addresses
Programmability:
any logical variable, contact, or virtual input
FLEXELEMENTS™
Number of elements:
16
Operating signal:
any analog actual value, or two values in differential mode
