MI 3101 EurotestAT: Appendix E
Reduced low voltage supply systems
111
E.3.1 MI 3101 functions and reduced low voltage systems
The table below contains EurotestAT functions intended for test and measurement of
supply systems with compatibility notes related to the reduced low voltage system.
Reduced low voltage
system
functions
Note
Voltage
Voltage
Symbols modified for reduced low voltage system.
Phase rotation
Three-phase system automatic detected.
RCD functions
RCD – Contact voltage Uc For both possibilities, L1-PE and L2-PE.
RCD - Trip out time t
RCD - Tripping current
RCD – Automatic test
Loop functions
Fault Loop Impedance
Both fault loops, Z
1
(L1-PE) and Z
2
(L2-PE).
Fault Loop Prospective
Short-circuit Current
I
SC1
and I
SC2
for both fault loops.
Line functions
Line Impedance
Impedance Z
Line-Line
.
Line Prospective
Short-circuit Current
I
SC
for U
Line-Line
= 110 V.
Continuity functions
Independent of selected supply system.
Insulation Resistance
Independent of selected supply system.
Earth resistance
Independent of selected supply system.
PE test probe
Disabled.
E.3.1.1 Voltage measurements
Figure E.2: Voltage measurements
Displayed results for
single phase
system:
U21..........Voltage between line conductors
U1pe........Voltage between line 1 and protective conductors
U2pe........Voltage between line 2 and protective conductors
