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Thursday, February 19, 2015

What is Insulation Resistance, Dielectric Absorption, Polarization Index

INSULATION RESISTANCE
 Insulation Resistance is the resistance offered by insulator separating two electrodes. The value determines quality of insulation.

POLARIZATION INDEX
The ratio of the ten-minute to the one-minute measurement is known as the Polarization Index. In general, a high ratio is indicative of 'good' insulation.

DIELECTRIC ABSORPTION
Carrying out a 10-15 minute test will yield some meaningful information. Clean, dry insulation will show an increasing resistance reaching a final steady-state level, after 10 to 15 minutes. Wet or dirty insulation will reach a steady state value much sooner.