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VLF Hipot Testing for Insulation Preventive Maintenance

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Insulators may not be subjected to friction or other mechanical stress, they are still at risk of deterioration. The electrical stress, normal weathering and contaminants cause the insulator to lose its resistivity. It is a good idea to check for problems even if they seem to be working fine. There are times that problems are already present but the insulation is still able to tolerate the fault. If the insulator fails, the damage may be catastrophic.

High potential stress testing is one of the tests to verify the reliability of insulators. However, the conventional DC hipot test isn’t suitable for electrical components already in operation. Using this testing method puts the risk of damaging the insulation of the electrical components. A safer and reliable method for testing insulation is VLF hipot. Instead of using a high DC test voltage, this test uses an alternating current with a very low frequency of 0.1 Hertz. The low frequency allows the tester to use lesser power compared to DC high potential testing.

Protec Equipment Resources offer VLF high potential testers along with other electrical test equipment for rent. Contact us to learn more about our rental services available.