Electrical insulation - Coil Winding Expo · PDF fileSafety and Performance Reliability of...
Transcript of Electrical insulation - Coil Winding Expo · PDF fileSafety and Performance Reliability of...
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© 2014 UL LLC.
Safety and Performance
Reliability of Electrical
Insulation SystemsMark Raymond
Principal Engineer
Visit us at Booth 3.1/E41
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Slide 2
Objectives
• What is an Electrical Insulation System?
• History of Electrical Insulation Systems
• What is UL 1446?
• Performance and Safety
• Future state
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Insulation System Definition
Electrical Insulation System
(EIS) – Electrical insulating
structure containing one or
more electrical insulating
materials (EIM) together with
associated conducting parts
employed in an
electrotechnical device
Example - the combination
of a magnet wire, ground
and interwinding insulation,
and impregnating resin in a
transformer
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EIS Components
Electrical Insulating Materials
(EIM) – Materials relied on in
the EIS to prevent risk of
electric shock and dielectric
breakdown (formerly known as
Major Components)
Non-electrical Insulating
Materials (NIM) – Materials
used for mechanical or thermal
applications and not relied on to
prevent electric shock or
dielectric breakdown (formerly
known as Minor Components)
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History of Electrical Insulation Systems
Need to know
the effects of
Temperature
on Electrical
Insulation
US Navy ships
have limited space
and smaller equip-
ment was needed
to allow for more
room
But how will it
perform?
Compare new
materials with
existing known
service life
materials
1958 US Navy
sponsored
Round Robin
EIS testing
Establish
Thermal
aging test
procedure
to allow
comparison
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History of Electrical Insulation Systems
Functional Evaluation of
Motorette Insulation
Systems - March 1959;
Brancato, Johnson,
Campbell & Walker
Reliability Prediction
Studies on Electrical
Insulation: Navy
Summary Report - July
1977; Brancato, Johnson,
Campbell & Walker
IEEE 117 - IEEE Standard
Test Procedure for
Evaluation of Systems of
Insulating Materials for
Random-Wound AC
Electrical Machinery
Military Specification
MIL-E-917D (Navy),
covering the basic
requirements of
electrical power
equipment for naval
shipboard use
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History of Electrical Insulation Systems
A material that is classified as suitable for a
given temperature may be found suitable for
a different temperature, either higher or lower,
by an insulation system test procedure.
(para. 3.5.2.1.10)“
”
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History of Electrical Insulation Systems
(1) “Material Thermal Class Ratings vs EIS Thermal Class Rating,” Eltek International Laboratories, April 2015.
Study(1) conducted
comparing EIM
ratings vs. EIS
thermal ratings
established by Full
Thermal Aging
Test data from 30 EIS Aging tests were reviewed
15 (50%) were rated higher than the lowest EIM rating
14 (47%) were rated lower than the lowest EIM rating
1 (3%) were rated the same as the lowest EIM rating
This study supports the value in thermal evaluation of an EIS as a complete
system rather than relying upon individual EIM ratings alone to determine
thermal class for the system
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What is UL 1446?
Standard of
Insulating
Materials –
General
First Edition
of UL 1446
Published
June 1978
Makes Use of
Existing
Standards for
Evaluation of
EIS and EIM,
predominately
IEC standards
Provides
Guidance on
Substitution
of Materials
UL 1446
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Insulation System Compatibility
Magnet
Wire
Tap
es
Lead Wire
Slot
Liners
Layer
Insu
lati
on
Sp
acers
Slot Wedges
Tie
Co
rds
Laminations
Phase
InsulationGround Insulation
Varn
ish
Cross-Over Insulation
Slide 10
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Performance and Safety
Magnet
Wire
Tap
es
Lead Wire
Slot
Liners
Layer
Insu
lati
on
Sp
acers
Slot Wedges
Tie
Co
rds
Laminations
Phase
Insulation
Ground Insulation
Varn
ish
Cross-Over Insulation
Chemical interaction
between polymeric
materials at elevated
temperatures may
prematurely degrade
critical insulating
materials
This may eventually cause
potential hazards
• Risk of Fire
• Risk of Electric Shock
• Risk of Injury to Persons
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Performance and Safety
Sustained exposure to heat is a
major cause of polymeric
material degradation
Thermal Aging Test is
conducted to establish a
maximum temperature that an
EIS will operate for the intended
service life of the product
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Full Thermal Aging (FTA)
Thermal
Endurance
Test
Actual Operating Part:
• Motors
• Transformers
• Solenoid Coils
Non Functional
Test Specimens
General Purpose Model (GPM)
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Full Thermal Aging (FTA) – General Purpose
Model (GPM)
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Thermal Aging Test Program
Oven(Conditioning)
Cold(Conditioning)
Vibration(Conditioning)
Moisture(Conditioning)
Turn to Turn (Proof Testing)
Ground, Interwinding
and Encapsulant(Proof Testing)
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Thermal Aging Test Program
Conditioning• Oven
• Vibration
• Cold
• Moisture
Proof Testing• Turn to Turn
• Ground, Interwinding and Encapsulant
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UL’s Electric Insulation System Categories
OBJY
Primary category for
manufacturers of EIS in
their products. i.e. Motor
and transformer
manufacturers
OBJS
Category established for
supplier of materials used
in EIS by the OBJY
manufacturer. i.e. plastic
and impregnating resin
manufacturers
Slide 17
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Performance and Safety
Evaluation of an EIS allows for
Efficient use of
materials
Reduction in
size and weight
of the device
Leverage
availability of
supply chain
materials
Greater
Confidence in
Reliability and
Performance
Slide 18
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Future State of Electrical Insulation Systems
Current UL 1446
Standards Technical
Panel activities
• Removed voltage
reference in Scope
• Improve definition of
Terms
• Add equivalent IEC
test as preferred
method for existing
ASTM methods
Proposal to revise the organization of UL 1446
• Thermal aging of EIS
• Substitution guidelines
• Magnet Wire and Coatings
• Varnishes and Impregnating Resins
• Specific Ground and Interwinding Requirements
• Molding requirements for Ground Insulation
• Integral Ground Insulation
• Flexible Laminate Requirements
• Laminate Construction Details for Insulation
Systems - Component
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Future State of Electrical Insulation Systems
Improved Test Method for High
Voltage Transformer EIS
• Current method IEEE C57.12.60
• IEC 61857-41
• 2016-06-10 closing date for
voting New Work Item Proposal
Form-wound Pre-insulated High
and Medium Voltage Motor
and Generator EIS
• IEC 60034-18-31
• IEC 61858-2 Form-wound EIS
substitution
Use of extended Field History of EIS
in lieu of Thermal Aging
IEC 61857-41
• If approved and published it will
immediately be available for use
under UL 1446 standard because UL
1446 references IEC 61857 (All Parts)
• EIS thermal rating is based upon a
voltage stress level, i.e. kV/mm and
may be used in a variety of transfor-
mer designs that use the same mate-
rials tested and the voltage stress
level is at or below the level tested.
Slide 20
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Future State of Electrical Insulation Systems
Short Term Thermal Aging
of EIS for use in Motors
• IEC 60335-1 Annex C
• Test on actual motor using
locked rotor and monitor
winding temperature
• Elevate winding
temperature above
anticipated Thermal Class
• Test time takes
approximately 50 days
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Example of STTA Test
Desired rating is Class B 130ºC
Shortest test time is achieve using test temperature 55ºC above thermal class i.e. 185ºC
Use 6 motors for test
Thermal couple the windings and lock the rotors
Apply voltage to increase the temperature of the windings to 185ºC
When temperature is stable, maintain for 250 hours (cycle)
After 1st cycle measure the leakage current, requirement <0,5mA
Repeat 3 more times, after last humidity conditioning conduct electric strength test
using value 50% of the required test voltage for device’s voltage rating
Then 48 hour humidity conditioning 93 ± 3% RH.
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Short Term Thermal Aging of EIS for use in Motors
Primary Benefits
Reduced time-to-
market due to an
accelerated (two
month) evaluation
Less expensive than
Full Thermal Aging
program
Reduced sample
preparation costs
and time due to
actual motor testing
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Key Take Away
The importance of thermal aging evaluation of the electrical insulation system
as a whole to determine thermal classification
What should you DO if you do nothing else
Be aware of IEC Standards Developments and get involved with your National
Committee
Slide 24
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Slide 25
Thank you!
Any Questions?
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© 2014 UL LLC.
Safety and Performance
Reliability of Electrical
Insulation Systems
Visit us at Booth 3.1/E41