CHAPTER 2: PRODUCT DESCRIPTION
SPECIFICATIONS
N60 NETWORK STABILITY AND SYNCHROPHASOR MEASUREMENT SYSTEM – INSTRUCTION MANUAL
2-19
2
OPEN POLE DETECTOR
Functionality:
Detects an open pole condition, monitoring breaker auxiliary contacts, the current in each
phase, and optional voltages on the line
Current pickup level:
0.020 to 30.000 pu in steps of 0.001
Line capacitive reactances (X
C1
, X
C0
):
300.0 to 9999.9 sec.
Ω
in steps of 0.1
Remote current pickup level:
0.000 to 30.000 pu in steps of 0.001
Current dropout level:
3%, not less than 0.05 pu
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
Operating signal mode:
signed or absolute value
Operating mode:
level, delta
Comparator direction:
over, under
Pickup Level:
–90.000 to 90.000 pu in steps of 0.001
Hysteresis:
0.1 to 50.0% in steps of 0.1
Delta dt:
20 ms to 60 days