How to check insulation resistance of motor

If the motor is not put into operation immediately upon arrival, it is important to protect it against external factors like moisture, high temperature and impurities in order to avoid damage to the insulation. In accordance with IEEE 4 clause 9. Using Megohm meter insulation resistance is measured. Our thanks to Megger for allowing us to reprint the following.

To prolong the life of electrical systems and motors , regular insulation resistance testing is required.

Over the years, after many cycles of operation, electric motors are exposed to environmental factors such as dirt, grease, temperature, stress, and vibration.

These conditions can lead to insulation failure, resulting in loss of .

How is IR testing done, in view of the fact that at least of electrical maintenance and testing involves evaluating insulation integrity? Reverse side of card (at right) is used to record the test data. Figure 3–Typical scale on the Megger insulation tester. HoW To InTERPRET RESISTAnCE REAdInGS. As previously mentione insulation resistance readings should be considered relative.

They can be quite different for one motor or machine tested three. Insulation resistance testers can be used to determine the integ- rity of windings or cables in motors , transformers, switch- gear, and electrical installations. The test method is determined by the type of equipment being tested and the reason for test - ing. For instance, when testing electrical cabling or switchgear. Normally insulation resistance of motor is more than 1Mega Ohms.

Very good explanation of HV insulation testing and its value. Bear in mind that insulation resistance values will vary w. I said the volts should read zero, . Earth Continuity and Resistance Test (c) Power Supply Test (d) AC Motor Winding Resistance Test (e) Insulation Resistance Test (f) Running Amps Test. General Inspections For the single phase motor , do the following: (1) Check the appearance of the motor. Check for burnt, damage to body or cooling fan or shaft. Remove any wire nuts or insulation tape from the connections, and see to it that you have only exposed copper wires for testing the motor leads.

Switch on your volt ohmmeter to ohms. Now connect the leads from your motor to each power connection. See to it that each reading shows only either infinite . All electrical installations and equipment comply with insulation resistance specifications so they can operate safely.

Whether it involves the connection cables, the sectioning and protection equipment, or the motors and generators, the electrical conductors are insulated using materials with high electrical. How significant is insulation resistance testing ? Since of electrical maintenance and testing involves evaluating insulation integrity, the answer is very important. An aging deteriorates its performance.

Harsh installation environments, especially . All of us in the electrical service industry test the winding ground insulation resistance of machines such as motors and generators . Electrical Apparatus Service Association.