Product presentation CPT tech Jason Evershed, ABB Transformer Components, May 21st 2014 New RIS transformer bushings The paper-free solution
Transformer condenser bushings Why a new technology? To preserve the safety and performance benefits of the traditional RIP bushings oil-free and fully dry explosion proof and fire resistant high thermal strength, temperature class 120 C low dielectric losses partial discharge free excellent mechanical strength transportation, storage and assembly at any angle practically maintenance free May 21/22, 2014 Slide 2
Transformer condenser bushings Why a new technology? while providing new customer benefits like significantly easier and more economic long-term storage easier and simpler bushing handling during transport, assembly and disassembly shorter purchasing cycles optimised value for money less capital bound for maintenance of strategic reserve/ stock May 21/22, 2014 Slide 3
Transformer condenser bushings How the new bushing technology is named? The new bushing technology is called Resin Impregnated Synthetics (RIS) May 21/22, 2014 Slide 4
RIS Condenser bushing What is the technical achievement? Compact and light bushing design Completely free of oil and paper Avoidance of moisture adsorption Elimination of external insulator components and filler material Superior mechanical, thermal and electrical properties Same field grading like with RIP bushings May 21/22, 2014 Slide 5
RIS Condenser core materials Synthetic fibers and epoxy resin Synthetic fabric prevents condenser core from humidity uptake Open structure of synthetic fabric allows to use filled epoxy resin for impregnation Inorganic mineral fillers yield to excellent mechanical, electrical and thermal properties of the epoxy resin condenser core May 21/22, 2014 Slide 6
RIS Condenser core production Minimized manufacturing process steps Condenser Core based on synthetic fibers is molded into final shape Extended Drying time not required Mechanical shaping (milling) is not required Humidity penetration is physically limited May 21/22, 2014 Slide 7
RIS Technology Significant operational advantage no humidity uptake Dissipation factor as function of storage time 3 2.5 2 1.5 1 0.5 0 Dissipation factor [%] RIS RIP 0 50 100 150 200 Storage time [d] Results for Test at 40 C / relative humidity of 95% Source: ABB Switzerland Ltd. Humidity in condenser core increases dissipation factor Stable dissipation factor means no humidity uptake Used RIS materials have very low saturation level Highest bushing safety and reliability in all climatic environments May 21/22, 2014 Slide 8
RIS Technology outdoor silicon insulation Directly molded on condenser core Silicone sheds are directly molded on condenser cores Minimal number of interfaces between different materials Lowest material consumption LSR is Hydrophobic Silicone molding process is done in-house In-house process control for entire bushing Dependence on external suppliers is significantly reduced Process long term proved for different ABB high voltage products May 21/22, 2014 Slide 9
RIS Condenser bushings What are the main manufacturing steps? Condenser core is wound out of synthetic fabrics Al-foils used as condenser layers inside the wound core Condenser core is impregnated with filled epoxy resin and molded into final shape Silicone sheds are molded directly onto the condenser core Final assembly of shielding electrode etc. Routine testing May 21/22, 2014 Slide 10
The RIS Technology - Overview RIS 4 3 1 2 5 Main parts of a RIS bushing: 1. RIS condenser core with adaptable current transformer extension 2. Direct molded silicone outdoor insulator 3. Mounting flange with measuring tap 4. End shield 5. Connection terminal on air side May 21/22, 2014 Slide 11
RIS product family The easy way of bushing Easy to use, maintenance free: Inspection free Transportation/ assembly/ storage at any angle No humidity uptake during storage Excellent thermal and electrical properties Partial discharge free up to double service voltage High thermal endurance (class E, 120 C) Low dielectric losses (tan δ < 0.35 %) May 21/22, 2014 Slide 12
RIS bushings Common specifications Classification: dry, fine capacitive graded, paper free, resin molded bushing Minimum ambient temperature: - 40 C (- 60 C on request) Altitude of installation: 1000 m (1800 m on request) Pollution level: very heavy (31 mm/ kv) Mounting angle: vertical down to horizontal Standards IEC 60137 (2008) IEEE C57.19.00 and C57.19.01 May 21/22, 2014 Slide 13
RIS Technology Customer benefits summary You will get a dry bushing which provides maximum safety and reliability at the highest technical characteristics Long-term storage is significantly easier and more economic Transport, assembly and disassembly easier and simpler Purchasing cycles are much shorter Optimised value for money Less capital bound for maintenance of strategic reserve or intermediate stock Lowest impact on environment during manufacturing, operational and disposal May 21/22, 2014 Slide 14
GSB 800 Type Rated voltage Lightning impulse Rated current Creepage distance Mass Airside length GSB 800 RIP 800 kv 2550 kv 2000A 28 000 mm 2345 kg 6890 mm
Questions and discussion May 21/22, 2014 Slide 16
May 27, 2014 Slide 17