MI 3152(H) EurotestXC (2,5 kV) Tests and measurements
144
Insulation resistance between L2-PE is decreased automatically according to limit
value
*)
every time interval selected with timer. To speed up the test press the
or keys until IMD alarms an insulation failure for L2.
Press the or the key.
If IMD switches off voltage supply, instrument automatically proceeds to the
PASS / FAIL / NO STATUS indication.
Use to select PASS / FAIL / NO STATUS indication.
Press or the key to confirm selection and complete the
measurement.
Save results (optional).
*)
When MANUAL R or AUTO R sub-function is selected, starting value of insulation resistance
is determined by
.
When MANUAL I or AUTO I sub-function is selected, starting value of insulation resistance is
determined by
Figure 7.77: Examples of IMD test result
Test results / sub-results
Threshold insulation resistance between L1-PE
Calculated first fault leakage current for R1
Threshold insulation resistance between L2-PE
Calculated first fault leakage current for R2
Calculated first fault leakage current at threshold insulation resistance is given as
,
where U
L1-L2
is line-line voltage. The calculated first fault current is the maximum current that
would flow when insulation resistance decreases to the same value as the applied test
resistance, and a first fault is assumed between opposite line and PE.
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