Motor Insulation Resistance Test

Using insulation testing with an instrument such as the fluke 1555 10 kv insulation tester combined with fluke connect technology such leaks can be detected as insulation resistance slowly tapers over time a sign of normal and expected deterioration.

Motor insulation resistance test.

Whether the dielectric is good or bad. Insulation resistance decreases in temperature or moisture. Loss of insulation resistance of an electric motor is one of the first signs of motor failure. During the measurement and immediately afterwards some of the terminals carry dangerous voltages and must not be touched.

The measurement of insulation resistance is carried out by means of a megohmmeter high resistance range ohmmeter this is how the test works. Set the voltage. The insulation keeps the current flowing along the wire exactly as intended. Because electrical insulation will exhibit dynamic behavior during the course of your test.

With a little record keeping and common sense however you can get a good picture of the insulation condition from values that are only relative. For a three phase motor the isolation resistance can usually be measured between each motor winding or phase and between each motor stage and motor frame earth by an insulation tester or megger 4. After 1 min you should read and record the resistance value. For a three phase motor insulation resistance is usually measured between each motor winding or phase and between each motor phase and motor frame earth using an insulation tester or megger.

When performing insulation resistance testing you must maintain consistency. 1 insulation resistance ir this is the simplest of the tests. A if the insulation resistance of a new cleaned or repaired motor that has been stored for some time is less then 10 mω the reason might be that the windings are humid and. The megger insulation tester is a small portable instrument that gives you a direct reading of insulation resistance in ohms or megohms.

Regular checks of motor insulation resistance the key to prolonging the life of any electrical device is periodic checks maintenance the insulation resistance of stored and active motors should be checked regularly. Basically there are three different tests that can be done using a megohmmeter. After the required connections are made you apply the test voltage for a period of one min.