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Metrel MI 3152 - EurotestXC Manual

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MI 3152(H) EurotestXC (2,5 kV) General description
9
1.1.5 Notes related to measurement functions
Insulation resistance
The measuring range is decreased if using Plug commander.
If a voltage of higher than 30 V (AC or DC) is detected between test terminals, the
measurement will not be performed.
Diagnostic test
If any insulation resistance values (RISO(15 s) or RISO(60 s )) are over-ranged the DAR
factor is not calculated. The result field is blank: DAR:_____!
If any insulation resistance values (RISO(60 s) or RISO(10 min)) are over-ranged the PI
factor is not calculated. The result field is blank: PI :_____!
R low, Continuity
If a voltage of higher than 10 V (AC or DC) is detected between test terminals, the
measurement will not be performed.
Parallel loops may influence on test results.
Earth, Earth 2 clamp, Ro
If voltage between test terminals is higher than 10 V (Earth, Earth 2 clamps) or 30 V (Ro)
the measurement will not be performed.
Contactless earthing resistance measurement (using two current clamps) enables
simple testing of individual earthing rods in large earthing system. It is especially suitable
for use in urban areas because there is usually no possibility to place the test probes.
For two clamps earth resistance measurement clamps A 1018 and A 1019 should be
used. Clamps A 1391 are not supported. The distance between clamps should be at
least 30 cm.
For specific earth resistance measurements Adaptor A 1199 should be used.
RCD t, RCD I, RCD Uc, RCD Auto
Parameters set in one function are also kept for other RCD functions!
Selective (time-delayed) RCDs have delayed response characteristics. As the contact
voltage pre-test or other RCD tests influence the time delayed RCD it takes a certain
period to recover into normal state. Therefore a time delay of 30 s is inserted before
performing trip-out test by default.
Portable RCDs (PRCD, PRCD-K and PRCD-S) are tested as general (non-delayed)
RCDs. Trip-out times, trip-out currents and contact voltage limits are equal to limits of
general (non-delayed) RCDs.
The a.c. part of MI and EV RCDs is tested as general (non-delayed) RCDs.
The d.c part of MI and EV RCDs is tested with a d.c. test current. The Pass limit is
between 0.5 and 1.0 IdNDC.
The Zs rcd function takes longer to complete but offers much better accuracy of fault
loop resistance (in comparison to the RL sub-result in Contact voltage function).
Auto test is finished without x5 tests in case of testing the RCD types A, F, B and B+ with
rated residual currents of IdN = 300 mA, 500 mA, and 1000 mA or testing the RCD type
AC with rated residual current of IdN = 1000 mA . In this case Auto test result passes if all
other results pass, and indications for x5 are omitted.
Auto test is finished without x1 tests in case of testing the RCD types B and B+ with
rated residual currents of IdN = 1000 mA. In this case Auto test result passes if all other
results pass, and indications for x1 are omitted (MI 3152 only).
Tests for sensitivity Idn(+) and Idn(-) are omitted for selective type RCD.
… 10 …


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