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Electric Motor Surge Testing Why surge testing helps detect motor failures.
Things you need to tell your motor shops.
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Surge Testing Predicts Electric Motor Failure
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Electric motor surge testing helps identify a shorted motor conductor turn and is a predictor of future motor failure due to turn-to-turn shorting.
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Root Causes of Failure
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Electric Motor Insulation as Root Cause of Failure
Failure of electric motor conductor insulation is a first sign that motor is going to fail. Root cause of failure is often insufficient insulation on windings, especially at turns.
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Motor Insulation Damage
Chemical deposits on motor windings break down electric motor insulation. Movement of winding during start-ups causes excess wear on insulation.
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Electric Motor Surge Testing Essentials
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80% of electric motor failures start out as turn-to-turn faults. Motor Surge Testing needs to be part of a comprehensive maintenance program.
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Surge Testing Can Lower Failures
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SKF Power Packs Baker PP30, Baker PP40 and Baker PP85
A surge test is conducted with a Baker type testing machine, following accepted procedures.
Baker-Type Surge Testing
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Motor technician connects a Baker-type test machine to load side of motor starter. A voltage pulse is placed across two of the three electric motor winding conductors.
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Testing Procedure
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Motor Testing Procedure
Test is then repeated for all three pairs of motor windings to enable comparison. Common problem is motor shops not understanding proper voltage levels.
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Understanding Correct Electric Motor Testing
Standard
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Know the Proper Standard
Test is for the dielectric strength of motor insulation separating the turns within a form wound coil.
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To calculate motor voltage, define the type or condition of motor coils, as shown below.
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Common Motor Testing Standards
Correct Motor Voltages Will Vary
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IEEE 522 Levels
Ensure that your motor shops use proper voltages for surge testing. Voltages below are per IEEE 522.
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Applying Correct Voltage Levels
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Waveforms Confirm Successful Test
Uniform Oscilloscope WaveForm
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An ideal motor surge test on an oscilloscope will display a uniform waveform. All three sets of windings must be acceptable.
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Ask Questions, Avoid Failures
Ask your motor shop which standard they use for surge tests. Low and Medium Voltage Motor Repair Service Center (Shop) Selection Guide
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Visit our website for the motor testing standards guide. Ensure that your motor shop follows the proper standard.
For assistance or a consult contact [email protected]
or call 800.993.3326
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