METREL MI 3125 - RCD Autotest Functionality

MI 3125 EurotestCOMBO Testing RCD
36
Displayed results:
I ...........Trip-out current,
Uci Contact voltage at trip-out current I or end value in case the RCD didn’t
trip,
t ...........Trip-out time.
5.5.4 RCD Autotest
RCD autotest function is intended to perform a complete RCD test (trip-out time at
different residual currents, trip-out current and contact voltage) in one set of automatic
tests, guided by the instrument.
Additional key:
HELP / DISPLAY
Toggles between top and bottom part of results field.
RCD autotest procedure
RCD Autotest steps Notes
 Select the RCD function using the function selector switch.
 Set sub-function AUTO.
 Set test parameters (if necessary).
 Connect test cable to the instrument.
 Connect test leads to the item to be tested (see figure
5.18
).
 Press the TEST key to perform the test. Start of test
 Test with I
ΔN
, 0° (step 1).
RCD should trip-out
 Re-activate RCD.
 Test with I
ΔN
, 180° (step 2).
RCD should trip-out
 Re-activate RCD.
 Test with 2×I
ΔN
, 0° (step 3).
RCD should trip-out
 Re-activate RCD.
 Test with 2×I
ΔN
, 180° (step 4).
RCD should trip-out
 Re-activate RCD.
 Test with 5×I
ΔN
, 0° (step 5).
RCD should trip-out
 Re-activate RCD.
 Test with 5×I
ΔN
, 180° (step 6).
RCD should trip-out
 Re-activate RCD.
 Test with ½×IΔN, 0° (step 7).
RCD should not trip-
out
 Test with ½×IΔN, 180° (step 8).
RCD should not trip-
out