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MI 3152(H) EurotestXC (2,5 kV) Tests and measurements
145
Figure 7.77: Examples of IMD test result
Test results / sub-results
R1
Threshold insulation resistance between L1-PE
I1
Calculated first fault leakage current for R1
t1
Activation / disconnection time of IMD for R1
R2
Threshold insulation resistance between L2-PE
I2
Calculated first fault leakage current for R2
t2
Activation / disconnection time of IMD for R2
Calculated first fault leakage current at threshold insulation resistance is given as 󰇛󰇜 
󰇛󰇜 ,
where UL1-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.
If any of the activation / disconnection time result (t1, t2) is out of set limit, overall status of the
test is “failed” and cannot be modified manually. Otherwise overall status can be user defined.
If activation of IMD device is visual indication and/or audio alert, without voltage disconnection,
Time limit (t1,t2) parameter should be set to “Off” to disable timing limitation.
146


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