Insulation resistance testers can be used to determine the integrity of windings or cables in motors,transformers,switchgear,and electrical installations.The test method is determined by the type of equipment being tested and the reason for testing.
Installation testing The most important reason for testing insulation is to insure public and personal safety. By performing a high dc voltage test between de-energized current-carrying (hot), grounded,and grounding conductors, you can eliminate the possibility of having a life-threatening short circuit or short to ground. This test is usually performed after the initial installation of the equipment. This process will protect the system against miswired and defective equipment,and it will insure a high quality installation, customer satisfaction, and protect against fire or shock. Maintenance testing The second most important reason for insulation testing is to protect and prolong the life of electrical systems and motors. Over the years, electrical systems are exposed to environmental factors such as dirt, grease, temperature, stress, and vibration. These conditions can lead to insulation failure, resulting in loss of production or even fires. Periodic maintenance tests can provide valuable information about the state of deterioration and will help in redicting possible failure of the system. Correcting problems will result not only in a trouble-free system, but will also extend the operating life for a variety of equipment.
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