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Bushings
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What does it do? What is a bushing? Used to conduct current
Provide insulation
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Materials / Types of insulation
Ours Polymer cycloaliphatic Dry type Others Ceramic/phenolic paper Oil filled
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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
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What are the components?
Central conductor Insulating material Flange Capacitance tap Shield
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Determined by the customer requirements
Central conductor Determined by the customer requirements Type of connectors ends Size of conductor
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Cycloaliphatic epoxy resin-based Different formulations
Insulating material Cycloaliphatic epoxy resin-based Different formulations depends of the application Indoor/outdoor Mechanical loads etc...
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Flange Corrosion-resistant aluminium Allows adaptation to all possible designs Provide mechanical adaptation
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Shield Limit the level of electrical field around a Current transformer Connected to the ground by the flange Integrated to the insulating material
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Capacitance tap Allows shield to be disconnect from flange
Allows the measurement of: Capacitance of the bushing only Power factor Delta tangent
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Bushing applications
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Example of pole top transformers
Ex : Pole Top Transformer Bushing No shields Draw lead conductor
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Example of recloser types
Ex : Recloser Bushing Shield Solid conductor Angle conductor
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Example of recloser
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Example of breaker types
Ex: GE KSO & Westinghouse BN Shield Solid conductor or draw lead
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Examples of breakers
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Example of transformer types
Ex : ANSI Bushing, Primary & Secondary Shield Solid conductor or draw lead Capacitance tap
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Example of transformer
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Example of turbo generator types
Ex : Synchronous compensator for HQ Burrard Power Plant for BC Hydro H2 environment Subject to vibrations
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Before / After
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Synchronous Compensator
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Installation
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Example of wall bushing/rooftop types
Air/air bushing Solid conductor Shield
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Key features of our products
Dry type No oil and no PCB Can be mounted at any angles Environmentally friendly
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Key features of our products
Highly resistant to lightning Does not explode like porcelain Increased safety
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Key features of our products
Non tracking material - perfect for highly polluted areas : salt fog (coastal and highways) heavy industrialized areas
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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
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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
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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
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Key features of our products
Meet IEC/ANSI standards Individual test with report Hipot Partial discharge Capacitance
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Key features of our products
More resistant to damage (gun shot) Continued operation even if a shed has been damaged Minimizes equipment shutdown
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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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