Electric motor winding tools
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The current continues to become more resistive.The degradation of the insulation material increases.Below are some of the failure characteristics they may exhibit: Stage 2 - Possible Intermittent Motor Failureĭuring the second stage of electrical insulation failure, the deterioration of the windings becomes more pronounced. See phase angle explained in detecting insulation failures below.
#ELECTRIC MOTOR WINDING TOOLS PRO#
Early detection of insulation failure in electric motors allows a company to address the deterioration while it remains relatively minor, saving time and money and preventing catastrophic failure.ĪLL-TEST Pro instruments are the only instruments in the world that can perform early detection of insulation failure in electric motors consistently and at the earliest stages.
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Fortunately, early detection through checking windings and engaging in proper motor testing is extremely beneficial. In this stage, undesirable current flow between conductors does not yet occur, though the risk that it will begin to do so is high. Identifying faults at this stage of insulation failure is extremely important for reliable “world-class” operation of a plant’s electrical system. If the winding insulation undergoes the chemical change the phase angle (Fi) and/or the current frequency response will change. If the groundwall insulation undergoes the change this will cause the insulation resistance to decrease and the dissipation factor to increase. The insulation may begin to carbonize which causes the current to become more resistive, and less capacitive. The insulation strength and capacitance begin to decrease. The insulation chemically changes from an insulator and begins to become a conductor. Stage 1 - Ideal for Early Detectionĭuring the first stage of the failure of electrical insulation, the insulation between conductors becomes stressed and begins to change chemically.
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Most insulation failure occurs slowly and steadily, proceeding through three distinct stages. 3 Stages of Electrical Insulation Failure This guide will direct you through each stage of electrical insulation deterioration so you can be proactive and track these insulation changes in your motor equipment. Faults in the winding insulation system materialize slowly and deteriorate over time.Ĭommon causes of insulation failure include: These events attack voids or other weaknesses in the insulation and lead to premature failure. Some insulation failures particularly in the ground wall insulation system are instantaneous due to moisture ingression, contamination, or other unusual unique events. Aging or overheating causes chemical changes in the insulation that cause the insulation to become more conductive and become less effective at preventing the current from following undesirable paths either between the conductors or to the motor’s frame. Studies have shown that ≈ 80% of stator electrical faults occur in the winding insulation while only ≈ 20% occur between the coils and the motor frame or direct short to ground.Įlectrical insulation failure occurs when the insulation in the motor begins to degrade over time or for other reasons. The second insulation system is the winding insulation system that separates the conductors that are coiled to create the motor windings. One system is the groundwall insulation which separates the coils from the frame or casing of the motor. In motors there are 2 insulation systems. In electric generators, for instance, 56% of failures originate from electrical insulation damage. Insulation breakdown is one of the most frequent causes of electric motor failure. Proper electrical insulation is critical to an electric motor’s performance and longevity. Electrical Insulation is used to direct current through a desired path and prevent it from flowing where it is not desired.