Motor Insulation Resistance Test

Dc voltage of 500 or 1000 v is applied between the windings and the ground of the motor.

Motor insulation resistance test.

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. 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. Insulation resistance decreases in temperature or moisture.

Set the voltage. Whether the dielectric is good or bad. 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.

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 insulation keeps the current flowing along the wire exactly as intended. The measurement of insulation resistance is carried out by means of a megohmmeter high resistance range ohmmeter this is how the test works.

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. Because electrical insulation will exhibit dynamic behavior during the course of your test. 1 insulation resistance ir this is the simplest of the tests. When performing insulation resistance testing you must maintain consistency.

Insulation resistance test insulation resistance failure of an electric motor is one of the first signs that the motor is about to fail. Ground insulation test of a motor. 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.