IEEE Std 1415-2006 IEEE Guide for Induction Machinery Maintenance Testing and Failure Analysis
This a complete list of Motor Tests as listed under the IEEE std, with associated experience from 3Phi Reliability
Bearing temperature Simple trending, Better Methods for On Condition Lubrication
Recommended
Capacitance Ok for contamination of Windings
Core Loss Test Essential in Rewind Process, Conducted in Repair Shop Recommended
Current Trending OK if Process is stable
Current signature Good tool but Drive Emissions can crowd data
Current starting In Rush Current amplifies Winding Conditions, Meter Must have Low Pass filter and variable hz capability on drives Recommended
DC high potential .Limited Experience
Dielectric Similar to Polarization Index, Good on Open frame motors near Ammonia
Recommended
Dissipation
factor Cable defects can be detected. Motor Insulation
factor Cable defects can be detected. Motor Insulation defects
Grease analysis This is essential as part of a lubrication program. Especially on Drives
Recommended
Growler Repair Shop Rotor Analysis. Better in field rotor test(Rotor Signature)
Insulation resistance Mandatory Safety Test. Late Stage failure detection (Phase to Phase is better)
Recommended
Oil Analysis Very Effective early defect detection
Recommended
Partial discharge Essential for MV & HV Motors
Recommended
Phase angle Effective detection of early Winding defects, Trend-able
Phase balance(Inductance and Impedance)
Recommended
Polarization index Effective on Open frame motors where fugitive emissions (eg Ammonia)
Recommended
Shaft grounding currents More effective than Shaft Voltage
Recommended
Shaft Voltage Good Indicator of Drive Emissions
Speed Ok for measuring Slip frequency if Load constant
Surge test Effective Winding Test, Not easily Portable
Torque analysis Good Analysis, Takes a lot of setup not really potable
Ultrasound Great for On Condition Lubrication programs
Recommended
Variable frequency Effective early detection of Winding Defects, Portable
Recommended
Vibration Analysis Effective in many Motor defects both Mech Elect, limited Stator defect detection
Recommended
Voltage balance Essential Test, Highly damaging to Stator health
Recommended
Voltage distortion Power Quality should be checked with Power Analyzer, can affect Motor Efficiency
Recommended
Voltage drop As above On Motor Start
Recommended
Voltage level As above
Recommended
Voltage spikes As above
Recommended
Winding resistance Effective means of findings Circuit defects, and Energy Opportunities
Recommended
Winding Temperature Good trending indicator of Operating conditions
Recommended
Not Listed in IEEE Std
EMF Drive Emissions Essential test to Motor Stator Health
Recommended
Transfer Impedance Test to ensure grounding of Drive & Motor
Recommended
Mark Gurney Motor Analyst
http://www.3Phi-Reliability.com/
