Technical description
2 Protection functions
2.13 Inverse time operation
VM265.EN011
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95
2.13.3.
Programmable inverse time curves
Only with VAMPSET, requires rebooting.
The [current, time] curve points are programmed using
VAMPSET PC program. There are some rules for defining the
curve points:
configuration must begin from the topmost row
row 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 rows (on the bottom) should be filled with [1.00
0.00s]
Here is an example configuration of curve points:
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
Inverse time setting error signal
The inverse time setting error signal will be activated, if
interpolation with the given points fails. See chapter 2.13 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 2.13 for more details.
Summary of Contents for 265
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