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DIR 1000587R0002 (Version 02)
3.6.13.7. Trip curves for function U
t [s]
1
10
10
-1
1
10
10
2
10
3
10
4
10
-2
x In
10
-1
0,02
0,5
10
0,5 … 60
0,9
60
0,02 … 0,9
U
3.7.
Measuring functions
LSIG-MM include various measuring functions.
The basic measurements available in all models are:
- Currents: three phases (L1, L2, L3), neutral (N) and earth fault
- Trips (last 20) and events (last 80)
- Log register: storage of maximum current reading (with the date and time of recording)
- Peak factors: three phases (L1, L2, L3) and neutral (N)
- Percentage of contact wear.
3.7.1.
Runtime measurements: current, voltage, power
The main current, measurements can be accessed by using the UP and DOWN buttons from the default page.
In the default page, histograms with the currents appear on the display, while the value and the highest phase are also given in
the numerical format.
The following current measurements are available:
- Three-pole CB: phase currents I1, I2, I3 are available
- Three-pole CB, confi guration with external neutral (3P+N): phase currents I1, I2, I3, Ine are available
- Four-pole CB: phase currents I1, I2, I3, Ine are available
The runtime measurement tolerance margins are:
Type of measurement range
Range of values measured by
the trip unit
Standard operation
Range
Tolerance %
Phase and neutral currents
0.05 ... 16In
0.3 ... 6 In
± 1.5
Internal ground fault current
0.05 ... 16In 4In
0.3 ... 4 In
± 1.5
