METREL EasiPLUS MI 3000 - Page 42

MI 3000 EasiPLUS Measurements
Step 4 Check for warnings on the display and check the online voltage/terminal
monitor before starting the measurement. If everything is ok, press the TEST
key. After performing the measurement the results will appear on the display.
Figure 5.32: Example of fault loop impedance measurement results using trip-lock
function
Displayed result:
Z .............Fault loop impedance,
I
SC
...........Prospective fault current,
Lim .........High limit fault loop impedance value (if applicable).
Notes:
 The measurement of fault loop impedance using trip-lock function does not
normally trip an RCD. However, if the trip limit may be exceeded as a result of
leakage current flowing through the PE protective conductor or a capacitive
connection between L and PE conductors.
 The specified accuracy of test parameter is valid only if mains voltage is stable
during the measurement.
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