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After the protection has entered the start status and the preset operating time (Time) has elapsed,
the function goes into TRIP status and the trip signal is generated.
The protection function will exit the TRIP status and the trip signal will be cleared when the measured
current value falls below 0.4 of the set threshold value or when the block input becomes active.
If a different Machine State diagram characterises a protection function it will be represented in
the specific paragraph of that function.
14.7.2 Current protection functions, Basic set
14.7.2.1 Definite Time Overcurrent Protection
Two overcurrent definite time protection functions are available. Each of them can be activated
independently:
Overcurrent definite time low setting DT1 (I>)
Overcurrent definite time high setting DT2 (I>>)
Fig. 57
14.7.2.1.1 Parameters
Start Value (I>):
Time (t>):
Parameter
Start Value DT1, I>
Time, t>
Start Value DT2, I>>
Time, t>>
The threshold setting range is expressed in primary current Ampere [A], up to tens of In where In is the Nominal
Primary Current value entered in the General Settings.
Current threshold for overcurrent condition detection.
Time delay for overcurrent Trip condition detection.
Values
Default
0,20 ... 20 p.u. of In
1 In
20 ... 30000
5000
0,20 ... 20 p.u. of In
10 In
20 ... 30000
100
Step
Unit
Explanation
1
A
Current threshold.
10
ms
Time delay.
1
A
Current threshold.
10
ms
Time delay.
65
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