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Bushings

Bushings. What is a bushing?. What does it do?. Used to conduct current Provide insulation. Ours Polymer cycloaliphatic Dry type. Others Ceramic/phenolic paper Oil filled. Materials / Types of insulation. What product do we offer?. Voltage up to 46 kV Current up to 3000 A

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Bushings

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  1. Bushings

  2. What is a bushing? What does it do? • Used to conduct current • Provide insulation

  3. Ours Polymer cycloaliphatic Dry type Others Ceramic/phenolic paper Oil filled Materials / Types of insulation

  4. What product do we offer? • Voltage up to 46 kV • Current up to 3000 A • Air/air and Air/oil applications (also other special items) • Can meet IEC or ANSI standards

  5. What are the components? • Central conductor • Insulating material • Flange • Capacitance tap • Shield

  6. Central conductor • Determined by the customer requirements • Type of connectors ends • Size of conductor

  7. Insulating material • Cycloaliphatic epoxy resin-based • Different formulations • depends of the application • Indoor/outdoor • Mechanical loads • etc...

  8. Flange • Corrosion-resistant aluminium • Allows adaptation to all possible designs • Provide mechanical adaptation

  9. Shield • Limit the level of electrical field around a Current transformer • Connected to the ground by the flange • Integrated to the insulating material

  10. Capacitance tap • Allows shield to be disconnect from flange • Allows the measurement of: • Capacitance of the bushing only • Power factor • Delta tangent

  11. Bushing applications

  12. Example of pole top transformers • Ex : Pole Top Transformer Bushing • No shields • Draw lead conductor

  13. Example of recloser types • Ex : Recloser Bushing • Shield • Solid conductor • Angle conductor

  14. Example of recloser

  15. Example of breaker types • Ex: GE KSO & Westinghouse BN • Shield • Solid conductor or draw lead

  16. Examples of breakers

  17. Example of transformer types • Ex : ANSI Bushing, Primary & Secondary • Shield • Solid conductor or draw lead • Capacitance tap

  18. Example of transformer

  19. Example of turbo generator types • Ex : Synchronous compensator for HQ • Burrard Power Plant for BC Hydro • H2 environment • Subject to vibrations

  20. Before / After

  21. Synchronous Compensator

  22. Installation

  23. Example of wall bushing/rooftop types • Air/air bushing • Solid conductor • Shield

  24. Key features of our products • Dry type • No oil and no PCB • Can be mounted at any angles • Environmentally friendly

  25. Key features of our products • Highly resistant to lightning • Does not explode like porcelain • Increased safety

  26. Key features of our products • Non tracking material - perfect for highly polluted areas : • salt fog (coastal and highways) • heavy industrialized areas

  27. Key features of our products • Longer creepage distance • Because of higher mechanical properties of composite vs porcelain • Rule of thumb: ECI bushings are lighter and more compact than equivalent porcelain products

  28. Key features of our products • Low partial discharge • Because the manufacturing process is void free • Typical value under 2 pC, which translates to increased longevity of the insulation component

  29. Key features of our products • Lower cost and better delivery time • Shorter delivery times, generally half the time than for porcelain • Flexible tooling allows for more bushing designs to replace porcelain bushings no longer available • Typically lower cost: as much as 25% less than porcelain

  30. Key features of our products • Meet IEC/ANSI standards • Individual test with report • Hipot • Partial discharge • Capacitance

  31. Key features of our products • More resistant to damage (gun shot) • Continued operation even if a shed has been damaged • Minimizes equipment shutdown

  32. Conclusion • Why buy an ECI bushing? • Excellent electrical and mechanical properties • Non tracking, longer creep, low PD • Meet IEC/ANSI standards • Clean • Oil free / PCB • Environmentally friendly • Typically less expensive and faster delivery than porcelain bushings • Generally safer failure mode

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