UL 1446 Standard Of Systems of Insulating Materials Updates and Future Plans

Transcription

1 UL 1446 Standard Of Systems of Insulating Materials Updates and Future Plans Mark Raymond Principal Engineer Visit us at Booth 3.1/E UL LLC.

2 Objectives UL 1446 Standards Technical Panel (STP) Why Revise UL 1446? UL th Edition Proposal Future State of Electrical Insulation Systems Short Term Thermal Aging of EIS for use in Motors Slide 2

3 UL 1446 Standards Technical Panel (STP) Accredited Standards Developer An organization that meets the ANSI Procedures for the Development and Coordination of American National Standards, and has been approved by the ANSI Executive Standards Council (ExSC) for the development of American National Standards. ANSI The American National Standards Institute (ANSI) is a private nonprofit organization that coordinates and administers the U.S. voluntary standards and conformity assessment system. ANSI also coordinates the U.S. participation in the development of international standards. Slide 3

4 UL 1446 Standards Technical Panel (STP) Consist of members representing various categories Authorities Having Jurisdiction (AHJ) Commercial/Industrial User Consumer General Government International Delegate Producer Supply Chain Testing & Standards Slide 4

5 UL 1446 Standards Technical Panel (STP) Updated: 2/26/2016 Slide 5

6 UL 1446 Standards Technical Panel (STP) UL has only 1 of the 22 votes The STP structure gives industry and other interests strong influence in the standards development process Slide 6

7 Why Revised UL 1446 Standard? Scope was limiting Removed Reference to voltages Allows for expansion outside of low voltage applications Test methods referenced US based ASTM Standards Add IEC methods as Primary reference Slide 7

8 Why Revised UL 1446 Standard? Confusing Terminology Motorette = General Purpose Model (GPM) Major Component = Electrical Insulating Material (EIM) Minor Component = Non-electrical Insulating Material (NIM) Slide 8

9 Why Revised UL 1446 Standard? Difficult to find Requirements Reorganize the Structure of the Standard Logical Progression Add Requirements New Edition Slide 9

10 UL th Edition Proposal Proposal to revise the organization of UL 1446 Scope, Reference Publications, Units of Measure, Glossary Requirements and Thermal Aging of EIS Substitution Guidelines and Applicable Tests Magnet Wire and Coatings Varnishes and Impregnating Resins Integral Ground Insulation Laminate Construction Details for Insulation Systems Slide 10

11 UL th Edition Proposal Sections 1, 2, 3 and 4 are general and remain in the same location under new edition. Section 1: Scope [previously section 1] Section 2: Reference Publications [previously section 2] Section 3: Units of measure [previously section 3] Section 4: Glossary [previously section 4] Slide 11

12 UL th Edition Proposal Sections related specifically to EIS moved to front Section 5: Electrical Insulation Systems [previously section 7] Section 6: EIS Full thermal aging [previously section 11] Sections 1 through 6 relate to EIS all other requirements and guidelines are moved into the following Supplementals Slide 12

13 UL th Edition Proposal Supplement SA: Substitutions or Modification to an Electrical Insulation System [previously section 8] Performance Tests [previously section 12 15] 1-temperature aging 2-temperature aging Sealed Tube Chemical Compatibility Test Infrared Analysis Slide 13

14 UL th Edition Proposal Supplement SB: Magnet Wire and Magnet Wire Coatings [previously sections 5 and 9] Supplement SC: Varnish and Impregnating Resins [previously sections 6 and 10] Slide 14

15 UL th Edition Proposal Supplement SD: Integral Ground Insulation New to the standard. There are no published requirements or guidelines for this type of EIS evaluation. Supplement SE: Laminate Construction Details for Insulation Systems New to standard. Requirements for documenting materials used in the construction of flexible laminates Slide 15

16 Future State of Electrical Insulation Systems Improved Test Method for High Voltage Transformer EIS Current method IEEE C IEC closing date for voting New Work Item Proposal Form-wound Pre-insulated High and Medium Voltage Motor and Generator EIS IEC IEC Form-wound EIS substitution IEC If approved and published it will immediately be available for use under UL 1446 standard because UL 1446 references IEC (All Parts) EIS thermal rating is based upon a voltage stress level, i.e. kv/mm and may be used in a variety of transformer designs that use the same materials. Electrical insulation systems - Procedures for thermal evaluation - Part 31: Applications with a designed life less than 5000 hours IEC closing date for Committee Draft For Vote (CDV) Slide 16

17 Future State of Electrical Insulation Systems Short Term Thermal Aging of EIS for use in Motors IEC 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 Slide 17

18 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 Then 48 hour humidity conditioning 93 ± 3% RH. 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 Slide 18

19 Short Term Thermal Aging of EIS for use in Motors Primary Benefits Reduced time-tomarket 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 Slide 19

20 Summary UL 1446 Standards Technical Panel (STP) Why Revise UL 1446? UL th Edition Proposal Future State of Electrical Insulation Systems Short Term Thermal Aging of EIS for use in Motors Slide 20

21 UL 1446 Standard Of Systems of Insulating Materials Updates and Future Plans Thank You! Any Questions? Visit us at Booth 3.1/E UL LLC.