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MI 3152(H)
Eurotest
XC (2,5 kV)
Auto tests
135
8.4
AUTO IT – Auto test sequence for IT earthing system (MI
3152 only)
Tests / measurements implemented in AUTO IT sequence
Voltage
Z line
Voltage Drop
ISFL
IMD
Figure 8.12: AUTO IT menu
Measurement parameters / limits
Test
Test mode
[MANUAL R, MANUAL I, AUTO R, AUTO I]
t step
Timer (AUTO R and AUTO I test modes)
[1 s
… 99 s]
Fuse type
Selection of fuse type
[gG, NV, B, C, D, K]
Fuse I
Rated current of selected fuse
Fuse t
Maximum breaking time of selected fuse
Limit(dU)
Maximum voltage drop
[3.0 % ... 9.0 %]
Rmin(R1,R2)
Min. insulation resistance
[Off, 5 k
… 640 k
],
Imax(I1,I2)
Max. fault current
[Off, 0.1 mA ... 19.9 mA]
Imax(Isc1,Isc2) Maximum first fault leakage current
[Off, 3.0 mA ... 19.5 mA]
Ia(Ipsc (LN))
Minimum short circuit current for selected fuse
See Appendix A for reference fuse data.
Connection diagram
Figure 8.13: AUTO IT measurement