GENIE® MOTOR MEASURING TECHNOLOGY
Based on statistical data compiled by the Electric Power Research Institute (EPRI), 47% of motor failures are due to electrical failures. 47% can be broken down into rotor problems (10%) and winding problems (37%). Mechanical failures sometimes have root causes that are electrical in nature.
Winding defects can occur due to aging of the insulation, contamination, power surges, thermal overload, damaged materials or cables, vibration and other causes. They start as energy that crosses an insulation fault (such as moisture or contamination), which isolates at least one turn. This generates additional stress and heat throughout the defect, which progresses until an arc is obtained and the winding fails.
About winding failures
There are four basic types of winding failures.
• Between turns in a coil
• Between coils in one phase
• Between coils in different phases
• Between a coil or phase and the ground
Only about 5% of electrical faults start as a ground fault. The other three types of faults may or may not propagate in a ground fault as the fault progresses. The short-term result of these failures is reduced efficiency (and higher operating costs). Symptoms include higher operating temperatures, perhaps nuisance tripping and reduced engine life. As faults progress, power and torque may decrease. The long-term result is always engine failure.
Megohmmeter insulation tests will only detect ground faults. Since only 5% of motor failures start as ground faults, most failures cannot be detected using this method alone.
Power overload tests require the application of high voltages and currents that can be a destructive test, which can generate faults by themselves. This aspect, combined with the size of the power overload testing equipment, makes them unsuitable for troubleshooting and predictive maintenance testing.
The inductance and resistance (RLC) only test methods do not provide enough information to obtain reliable fault detection and troubleshooting results.
ALL-TEST PRO® MOTOR GENIE® is your best and most economic choice for troubleshooting and troubleshooting.