just cause you got the monkey off your back doesn't mean the circus has left town
TRANSCRIPT
Just cause you got the monkey off your back doesn't mean the circus has left town.
Enjoyment Scale of Presentation
Managing Expectations
UL 1446 and Thermosets for Electric Motors and Transformers
Predicting failure – Providing Safety
What is important to Electric Equipment?
Electrical Mechanical
Thermal Efficiency
Transformers and Motors
Why does temperature matter?
Why does temperature matter?
Why Temperature Stability is a Factor
Insulation System Compatibility and Ratings
Temperature rise above ambient (40)
Mechanical PropertiesExcellent strength to weight ratio, High Impact Strength, Good Flexural modulus and Tensile Strength, Very High Compression Strength
Electrical PropertiesHigh dielectric strength, arc resistance, track resistance
Environmental and Corrosion Resistance Resistant to Harsh Chemicals
Flame Resistant and Non-Melting Design Flexibility
Parts Consolidation, Appearance,Complexity, Functions, Size
Aesthetics Molded-in Color, Paint and Metalizing Temperature Stability Compatible in most UL EIS
Why Specify Thermosets
UL 1446
Verifying that all components are chemically compatible and when used at a given long term operational temperature
2 Types/Choices
UL approved EIS for a specific motor or transformer Database of insulation manufacturers that are available for adoption by
an end user
Full Thermal Aging Test
Sealed Tube Test
U.L 1446 Systems of Insulating Materials
Class 120 or Higher
Low Voltage < 1000 volts – UL 1771 is higher voltage
Dominating aging factor is temperature
Covers substitutions in minor insulations
Specifies test procedures for wire coatings and varnishes
U.L 1446 Systems of Insulating Materials
It does not cover a single component or single combination of materials
Does not cover systems that operate in oils, refrigerants, soaps etc…
Major versus Minor Insulation
Thermoset
Motorette or TransformeretteTesting
Construct Test Rigs
Heat Aging 4 temperatures – Highest to lowest - Test at end of each
cycle
Cold Shock -20 C
Mechanical Stress 1-3 hours Vibration at 60
Hz
End of Life Test 600 V phase to phase and phase
to ground
120 V turn to turn
10 minutes
Lowest test temperature shall result in geometric mean time (graphically) to end of life of at least 5000 hours
Qualifies the Major Components
Sealed Tube Testing
Developed to facilitate adding other products to the system without full testing
Twisted magnet wire pairs are loaded in to the tube then all the minor insulation samples
Dried for 1 hour at 221 F
Conditioned for 336 hours at temperature equal to the class rating of the system
Twisted pairs are then stressed electrically until breakdown
The results cannot be less than 50% of the original sample
Adopting the EIS
The easiest and most cost-effective method for a manufacturer of electrical equipment to have their own EIS system designation is to adopt a previously evaluated EIS without any modifications
Since it is not necessary to use all components of such an EIS the user could select an EIS containing all components needed.
Typical UL 1446 System
Typical UL 1446 System
Minor Insulation – non direct contact with the conductor
Power Generation
Power Generation
Who posed the question and what is the answer to?
Do you know why Santa Clause is always so happy?
Because he knows where all the bad girls live….
Power Generation
Slot Insulators and Topsticks
Coil Separators
Pole Piece Assemblies
Power Distribution and Control
Barriers
Mechanical Supports
Standoff Insulators
Electric Motors
Cooling Fans Terminal Blocks and Covers
Internal Parts – slot liners and top sticks
Power – Making it Useful
BMW Spartanburg SC Facility 1100 Acres + 5,000,000 Square Foot 300,000 X series SUVs per year
Wind
Trends
Exciting Prize Opportunity
Who said?
My wife can’t cook – she’s the worst cook in the world – at my house we pray after we eat….
Your Very Own Mar-Bal Eager Beaver
