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Insulation Resistance -old requirement

Ismael Ochoa
I have just come across a insulation resistance (IR) test requirement stating that the IR  R2/R1 > 0.7 where R1 is the IR before a Dielectric test ( 2000VAc for 1 min ) and R2 is the IR after the Dielectric test. Has anybody seen this requirement before?, if so what are the technical basis for this? Nowadays, standard only requests that IR should greater than certain value which depends on the equipment rated voltage.
Comments will be appreciated

I
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    John Russell:

    Are you sure that you're not getting confused with the Polarisation Index?  PI is the ratio of IR after 1 minute with IR after 10 minutes.  So R1/R10.  It is not an old requirement, it is still widely carried out on motors and generators.




    John, that is interesting and helpful. (I have Googled PI so I now know what it is.) My question is, however, can the PI test be done with yer ordinary Megger, or does it require different equipment?

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    John Russell:

    Are you sure that you're not getting confused with the Polarisation Index?  PI is the ratio of IR after 1 minute with IR after 10 minutes.  So R1/R10.  It is not an old requirement, it is still widely carried out on motors and generators.




    John, that is interesting and helpful. (I have Googled PI so I now know what it is.) My question is, however, can the PI test be done with yer ordinary Megger, or does it require different equipment?

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