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TS3
1SDH000670R0002
L3852
9/44
5.5.1.2
Auto protection
The time/current curve of the auto protection function is quoted here following:
The auto protection function, implemented on TS3, protects the trip unit under test for incorrect setting or/and cabling by the
user.
5.5.2
Alarms
Here following, the alarms messages visualized by the display in case of anomalies on supply voltage or internal overheating
of the instrument.
Nr. Parameter
Description
Message on the Display
1
Overvoltage
Overvoltage (115 … 125% on the
network supply voltage)
“OVERVOLTAGE”
2
Undervoltage
Undervoltage (75 … 85% on the
network supply voltage)
“UNDERVOLTAGE”
3
Overheat
Internal temperature (75 °C ±10%)
“OVERHEAT”
Table2. Alarms.
5.5.3
Timer
Technical characteristics
Nr. Parameter
Value/range
1
Resolution
1 ms
2
Max Tolerances for timer stop after TC trip
2 ms
Table3. Timer Characteristics.
0,1
1
10
100
1000
10000
0,1
1
10
100
x In
t [s]
Graph 1
Auto protection time/current curve
