Bushings

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

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

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

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

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

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

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

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

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

Bushing applications

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

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

Example of recloser

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

Examples of breakers

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

Example of transformer

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

Before / After

Synchronous Compensator

Installation

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

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

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

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

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

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

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

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

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

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