Programmable inverse time curves – Rockwell Automation 865 Differential Protection Relay User Manual
Page 90
3-46 Protection
Functions
865-UM001A-EN-P – July 2009
Inverse Time Setting Error Signal
The inverse time setting error signal will become active, if
interpolation with the given parameters is not possible. See Chapter 2
for more details.
Limitations
The minimum definite time delay start latest, when the measured
value is twenty times the setting. However, there are limitations at
high setting values due to the measurement range. See Chapter 2 for
more details.
Programmable Inverse Time Curves
The [current, time] curve points are programmed only using
SetPointPS PC program. There are some rules for defining the curve
points:
•
Configuration must begin from the topmost line
•
Line order must be as follows: the smallest current (longest
operation time) on the top and the largest current (shortest
operation time) on the bottom
•
All unused lines (on the bottom) should be filled with [1.00
0.00s]
•
Device must be rebooted to initialize the settings.
Here is an example configuration of curve points:
Table 3.26 – Curve Point Configurations
Point
Current I/I
pick-up
Operation delay
1 1.00
10.00
s
2 2.00
6.50
s
3 5.00
4.00
s
4 10.00
3.00
s
5 20.00
2.00
s
6 40.00
1.00
s
7 1.00
0.00
s
8 1.00
0.00
s
9 1.00
0.00
s
10 1.00
0.00
s
11 1.00
0.00
s
12 1.00
0.00
s
13 1.00
0.00
s
14 1.00
0.00
s
15 1.00
0.00
s
16 1.00
0.00
s