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5.7. Polarization index (PI)
The
key makes it possible to visualize the Polarization Index value on
the display. For this type of test, the equipment must be connected and
applying voltage to the sample for 10 minutes. After this period, the
operator must press the
display. If the key is pressed before the 10-min period has elapsed, the
display will show PI= - - -.
The polarization index is the ratio between the insulation resistance value
measured after 10 min and the value measured after 1 min. This index is
useful to determine whether it is necessary to perform preventive and
predictive Maintenance in order to detect any insulation resistance wear
and tear due to the excess of dust, dirt, grease, or else the action of
chemical or physical agents, etc.
key to show the PI value on the instrument
R
=
10 minutes
PI
R
1 minute
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