product presentation cpt tech – jason evershed, abb...

New RIS transformer bushings The paper-free solution

Product presentation CPT tech – Jason Evershed, ABB Transformer Components, May 21st 2014

© ABB Group May 21/22, 2014 | Slide 2

Transformer condenser bushings

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

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

Why a new technology?



The new bushing technology is called

Resin Impregnated Synthetics (RIS)

How the new bushing technology is named?


RIS Condenser bushing

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

What is the technical achievement?


RIS Condenser core materials

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

Synthetic fibers and epoxy resin


RIS Condenser core production

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

Minimized manufacturing process steps


RIS Technology

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

Significant operational advantage no humidity uptake

0

0.5

1

1.5

2

2.5

3

0 50 100 150 200

RIS

RIP

Dissipation factor as function of storage time Dissipation factor [%]

Storage time [d]

Results for Test at 40°C / relative humidity of 95% Source: ABB Switzerland Ltd.


RIS Technology outdoor silicon insulation

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

Directly molded on condenser core


RIS Condenser bushings

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

What are the main manufacturing steps?


The RIS Technology - Overview

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

RIS

1 2 5 3 4


RIS product family

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 %)

The easy way of bushing


RIS bushings

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

Common specifications


RIS Technology

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

Customer benefits summary

GSB 800

GSB 800 Type RIP Rated voltage

800 kV

Lightning impulse

2550 kV

Rated current

2000A

Creepage distance

28 000 mm

Mass 2345 kg Airside length

6890 mm


Questions and discussion

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