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PI and DAR insulation tests on electric motors

5,637 views

Harb Mecatrónica

Published on Oct 28, 2024

About :

In this video we are going to see how to perform 2 very important tests to know the insulation status in industrial electric motors, these tests are the PI and DAR or better known as polarization index and dielectric absorption index. Let's see what each test consists of, how to interpret the results and what decision we can make after performing these tests. 00:00 Introduction 00:45 The insulation meter 01:09 Recommendations and previous knowledge 01:41 PI test - Polarization index 04:08 Frequently asked questions about insulation measurement in motors 05:15 What should be the voltage of the megohmmeter or instrument to perform the insulation test? 04:46 Why is the motor not damaged if the test is done with 1000V? 06:13 Can the insulation test be performed with the motor running? 06:45 Can the insulation test be performed from the electrical control panel? 07:38 How often should insulation testing be performed on electric motors? 08:20 What are the minimum insulation measurements? 09:33 In which standards can decisions be made on the results obtained in the insulation test? 10:25 DAR test - Dielectric absorption index 11:58 Conclusions according to IEEE 43-2000 13:29 Conclusions according to other norms or standards 14:18 Final conclusion - PI and DAR test To start with these tests we have our Fluke 1507 insulation meter which allows us to measure up to 11G ohms, So to perform the PI test and the DAR test we must keep in mind that it is necessary to have previous knowledge about electric motors, for example, to identify if the motor is 6,9 or 12 points, star, delta connections, and so on. This is essential to see how the coils are distributed among themselves and to be able to perform an accurate insulation test and know how to interpret the results. Let's start with the PI test or polarization index, we set the selector to 1000V and with the pi and dar button we make the selection, if we press again DAR appears, we will leave it in PI to start the test. The PI test or polarization index is the ratio of the value of the insulation resistance after 10 minutes have elapsed and the value of the insulation resistance after 1 minute. The DAR test or dielectric absorption index, like the PI test, verifies the presence of humidity and / or contaminants in the insulation, but in a shorter period. It is the ratio of the value of the insulation resistance after 1 minute has elapsed and the value of the insulation resistance after 30 seconds. ⚡MASTER THE USE OF THE INSULATION METER • Master the USE of the INSULATION METER ... ⚡ALL ABOUT INDUSTRIAL ELECTRICAL MOTORS • What is a Stepper Motor and how does it work ... Contact: ???? EMAIL; [email protected] FOLLOW US ON OUR SOCIAL NETWORKS: ???? INSTAGRAM: / harbmecatronica ???? FACEBOOK: / harbmecatronica ???? TIKTOK: / harbmecatronica

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