Anders Hakansson, 40th annual IIEE Convention, 2015 …iiee.org.ph/wp-content/uploads/2015/12/FR3_40th-Annual-IIEE...Why ABB Vacuum Tap-Changers? Because reliability is everything

© ABB Group

December 9, 2015 | Slide 1

Why ABB Vacuum Tap-Changers? Because reliability is everything

Anders Hakansson, 40th annual IIEE Convention, 2015

On-load tap-changer technology

Introduction

OLTC Fundamentals

Vacuum interrupter technology

Maintenance

Overview

Upgrading of existing installations

Summary, Questions and Answers

Outline

Introduction ABB’s transformer heritage, a long pioneering history

The combined experience of

700 years of transformer

manufacturing

Asea

Ansaldo / Ital Trafo / IEL /

OEL / OTE

BBC

GE, USA

National Industry

Strömbergs

Westinghouse

and more ....

Welcome to Ludvika, Sweden… High Voltage Valley

Over 100 years of experience

More than 3000 employees

World class laboratories

Comprehensive range of products and systems for

transmission of electricity

© ABB Group


© ABB Group


Transformer components Tap-changers

Trends in the market

Less maintenance

Shortened lead times

Focus on environmental aspects

Safety becomes increasingly important

Distributed power generation (e.g. wind farms)

On-load tap-changers Fundamentals

© ABB Group


Introduction to voltage regulation

Other areas with emphasis of

voltage regulations

HVDC applications

Industrial applications

Phase shifting transformers

© ABB Group


Sometimes several hundred thousand

switching operations per year

In normal grid applications the tap-

changer:

Regulation range is typically ± 10 %

of the line voltage in 9 to 35 steps

Typically operated 10 to 20 times a

day

Selector switch

Diverter switch

Fundamentals In-tank design

Fundamentals On-tank design

Fundamentals Two main technologies

Conventional technology

Arc quenching in oil

Vacuum technology

Arc quenching in vacuum

Vacuum interrupter technology Vacuum Interrupter

1

2

3

4

5

6

7

Moving contact

Metal bellow

Ceramic insulator

Shield

Moving contact

Fixed contact

Vacuum technology Benefits

Less maintenance and lower life

cycle costs

300 000 operations between

maintenance

Radical reduction in contact

wear

Reduced downtime and cleaner

maintenance environment

Reduced sensitivity to moisture in the

tap-changer oil

Switching characteristics is

independent on status of the

insulating oil

Qualified for use with bio-degradable

fluids (VUCG)

Significantly improved breaking

capacity in demanding applications;

more efficient use in HVDC

© ABB Group


Tap-changer types Four main product families

On-tank and in-tank

Unsurpassed reference list in challenging applications, e.g. HVDC

and Ultra High Voltage systems (800 kV AC and DC)

© ABB Group


Type UZ Type (V)UC Type (V)UB Type VRLTC

Selector switch tap-changers Principle of operation

© ABB Group


Change-over selector: Device designed to carry, but not to make or break, current, used in conjunction with the selector switch to enable its contacts and the connection taps to be used more than once when moving from one extreme position to the other

Selector switch: Switching device capable

of making, carrying and breaking current,

combining the duties of a tap selector and a

diverter switch

Diverter switch tap-changers Principle of operation

© ABB Group


Diverter switch: Switching device used in

conjunction with a tap-selector to carry,

make or break currents in circuits which

have already been selected

Tap selector: Device designed to carry,

but not make or break, current, used in

conjunction with a diverter switch to select

tap connections

Change-over selector: Device designed to carry, but not to make or break, current, used in conjunction with the tap selector switch to enable its contacts and the connection taps to be used more than once when moving from one extreme position to the other

Diverter switch tap-changers UC - Principle of operation

© ABB Group


Diverter switch tap-changers VUCG - Principle of operation

© ABB Group


Diverter switch tap-changers Common features

Extensive service experience

Tens of thousands units in service

Unsurpassed reference list in challenging applications (HVDC)

Quick and easy maintenance

Unique, open design,

No special tools needed

Shaft outside diverter switch housing

Maintenance videos is several languages

Reliable

Few parts

Simple and robust design

Mechanical lifetime exceeds 1,200,000 operations

Traditional and vacuum technology

Easy to upgrade in the field

© ABB Group


Vacuum technology Maximal reliability - an absolute requirement

Exceptionally tested

Redundancy in the

electrical contact system

Rotating mechanical

systems minimize wear

Mechanical synchronization

of the vacuum bottles

© ABB Group



Introduction

OLTC Fundamentals


Maintenance

Overview



Outline

Diverter switch tap-changers Maintenance

Inspection - made annually

with transformer in service

Overhaul - transformer out

of service and OLTC

drained

Time based and

operation based for

tradition technology

Only operation based

for vacuum technology

© ABB Group


Maintenance of tap-changers Inspection

Made annually – transformer in

service

Check the counter for

number of operations

Check the wiring in the

motor-drive cabinet

Check the heater in the

motor-drive cabinet

Check the oil level and the

breather

© ABB Group


Maintenance of tap-changers

Transformer out of service and tap-changer

drained

Time based

Conventional; 5-7 years

Vacuum; Not applicable

Operation based

Conventional; After 1/5th of the

expected contact life

Vacuum: After 300,000

operations

© ABB Group


Maintenance of tap-changers Contact replacement

Conventional technology; 300 000 to 500 000 switching

operations

Vacuum technology; 600 000 switching operations

© ABB Group


Product portfolio Design features for easy maintenance

26 - 12/9/2015

Self-Dehydrating Breather SDB

Benefits:

Maintenance free

Automatic silicagel regeneration

Upgrade of existing transformers equipped with standard air

dehumidifier

Comply with EN61000-60721 and IEC60068-60529

Features:

No longer need to replace the silicagel

Dual tank working alternatively, moisture absorption always

guaranteed

Silicagel status always under control

SDB Family mp4

../Andras material/Comem/SDB Family (Jun 2013).mp4


Introduction

OLTC Fundamentals


Maintenance

Overview



Outline

Historical overview First tap-changer in history

Produced in 1910

First OLTC in the world

Used in smelting furnace

transformer

This particular HB was commissioned in the late 1920’s

Operated to the day it was decommissioned in 1998, almost

70 years of operation!

Historical overview Forerunner

Produced from 1935 - 1957

This particular HD was delivered in 1953 for an industrial

application

After more than 60 years, still in operation

Historical overview ASEA model HD/UD

ABB leading the way

First 380 kV Line

Supplied OLTC for world’s first

380 kV grid transformers

Grid established new 1952 world-record in system voltages

HVDC

Supplied OLTC for world’s first commercial HVDC transmission transformers in 1954

Historical overview First 380kV line and first HVDC installation

Historical overview ABB first with vacuum interrupter patent in 1975

October 1975 patent application for vacuum interrupter

Over 100 years of experience

© ABB Group


1900 1930 1960 1990

year

Traditional technology

First ASEA patent on

vacuum technology


Introduction

OLTC Fundamentals


Maintenance

Overview



Outline

Vacuum technology Field upgrading

Plug and play solution for all UCG/UCL.

Upgrade from conventional to vacuum technology in less than

one day

As easy as a normal overhaul

© ABB Group


© ABB

Month DD, YYYY | Slide 35

Summary

© ABB Group


Unique features in Our offer

Quality and reliability always comes first - Over 100

years of experience.

VUCG are an extremely robust Vacuum OLTC,

without one single failure so far world wide!

Back-up contact system if Vacuum bottle fails

Exceptionally tested, only ABB are type tested

according to latest revision IEC 60214-1, including:

Service duty test in a synthetic test circuit

(vacuum type on-load tap-changers)

Easy upgrade from conventional to vacuum

technology in a few hours

We are here to support you

24 h service telephone line

Certified ABB service engineers all over the

world

© ABB Group


© ABB Group


Documents

Anders Hakansson, 40th annual IIEE Convention, 2015 …iiee.org.ph/wp-content/uploads/2015/12/FR3_40th-Annual-IIEE...Why ABB Vacuum Tap-Changers? Because reliability is everything