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TA M I N I G R O U P

C . B a t t i s t i , 4 3 • 2 0 0 7 7 M e l e g n a n o ( M I )

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P O W E R T R A N S F O R M E R S

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Established in 1916 for

the production of

electrical transformers,

TAMINI has become a

leading manufacturer of a

complete range of type and size

of power transformers and

autotransformers - designed to

meet the specific requirements

of electrical power utilities

and large industries - as well as

of any type and size of

industrial transformers for

several different applications.

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250 MVA - 225/110 kV Power Transformer for Ireland

250 MVA - 400 kV Autotransformer for ENEL during short circuit withstand test (Italy) 140 MVA Power Transformer “Wander Type” for a substation in Germany

TAMINI Group, fully controlled by the

founder’s family, consists at present of four

companies, operates four manufacturing

units in Northern Italy and has operative

branches in the US for the North American

market and in England for the UK and Eire

markets.

The main engineering and design departments, R&D, QA,

administration, procurement and commercial offices are

located at the headquarters in Melegnano while each one

of the manufacturing units has its own local

engineering, quality control and production services.

TAMINI’ s total yearly production of 14.000 MVA

is split almost 50/50 between power and industrial

transformers.

The export activity typically covers around 70%

of the turnover and it is mainly directed to the highly

industrialized markets of Europe, North America

and more and more to the upcoming markets

of the Eastern countries.

For a detailed description of the range

of products of the Tamini manufacturing units,

see TAMINI GROUP PROFILE.

For detailed information on the presence of

Tamini in the world, see relevant reference list.

120 MVA – 275/33 kV Step up Transformer for Whitelee Windfarm in UK


Research and Development Equipment

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POWER TRANSFORMERS AND AUTOTRANSFORMERS

APPLICATIONS

The considerable experience TAMINI has in design

and manufacture of three and single-phase power

transformers and autotransformers covers the major

applications as mentioned here below.

GSU (Generator Step-up) transformers for

outdoor, indoor or underground power stations,

with HV level up to 400 kV.

Step-down transformers for primary and

secondary substations, with HV level up to 400 kV

High-rated autotransformers for interconnection

networks of different technical characteristics

with HV level up to 400 kV

Medium-size transformers designed to fit the

specific requirement of each electrical utility

Special-designed transformers for mobile

substations

Transformers for electronic networks

compensation

Regulating and Phase Shifting Transformers,

for active and reactive power control between

interconnection networks of different countries.

Substation transformers and autotransformers,

specially designed for steel works, metallurgical

plants and electrochemical plants (for these

applications see the catalogues “EAF Transformers”

and “Rectifier Transformers”)

Transformers for high-voltage test laboratories

Transformers used for renewable energy: wind

power plants, solar power plants etc.

Shunt Reactors for reactive power regulation

RESEARCH & DEVELOPMENT

Quality and Development cannot be achieved

without performing an intensive and continuous

research programme.

Tamini always dedicates the utmost attention and

resources to upgrading its methods of design and its

manufacturing and testing facilities, along with the

acquisition of ‘state of the art’ computer applications

In the fields of research and as current themes of

investigation on power transformers, it is worth to

mention the following activities :

Losses and noise level reduction

Optimization of the winding design to overcome

the effect of the harmonics

Simulation of electromechanical stresses due to

sudden overloads, short circuits, seismic strengths,

transportation and occasional shocks

Materials and components with improved

characteristics and performances

Testing instrumentation

Computer applications for any type

of calculation and simulation

The main scope of the research activities is to

achieve the best possible quality/price ratio,

by using the results of the co-ordinated

programmes of research in the different fields

as outlined here above.

337 MVA 400 kV Power Transformer under testing

65.5 MVA Phase-shifter Transformers for Switzerland

Technological progress in generation and

transmission systems for the Electrical Power

Industry, the increasing demand for interconnection

between networks of different voltages

and characteristics belonging to different countries

and regions, the requirements

for special solutions in step-down transformers

to be installed in specific industrial areas require

the transformer manufacturer to have a good

knowledge of the problems connected with

the different operations. TAMINI engineers

are continuously up-dating their knowledge

of technology evolution and they are able

to design and manufacture transformers

tailored to meet the different needs

of the utilities and of the end users.

320 MVA - 400 kV GSU Transformer for Italy

160 MVA - 225 kV Power Transformer for Belgium


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POWER TRANSFORMERS AND AUTOTRANSFORMERS

The construction, the treatment and the assembly of

the winding coils which can be considered to be the

heart of any transformer, are carried out in the

TAMINI workshops by teams of skilled workers

guided by experienced foremen.

G.O. silicon-steel laminations or complete magnetic

cores are procured already cut or fully assembled from

specialised manufactures of such components.

The clamping structures, the tanks and related

components, fittings, cooling parts and tap changers

are subcontracted to specialized and qualified

manufacturers and submitted to the TAMINI Quality

Control.

Any other operation, considered as fundamental for

the reliability and performance of the transformers, is

carried out in accordance with in-house

manufacturing, assembling and control procedures.

Therefore the completion of cores, the treatment

operations, the realization of auxiliary circuits, the

fitting of components and instruments, as well as

internal and acceptance testing and final checking

are performed by the factory staff, specifically trained

for every one of these operations.

The manufacture of large and medium power

transformers is mainly concentrated in the two

factories of Novara and Legnano, having together a

total area of 36000 sq.mt. (see “TAMINI GROUP

PROFILE” for a detailed description of these

factories).

The factory in Novara specializes in the manufacture

of transformers up to 100 MVA - 220 kV. Larger

transformers with 400 kV HV and over are

QUALITY ASSURANCE,

QUALITY CONTROL AND SAFETY

QA procedures are carried out and certified according

to ISO 9001-2000 Standards.

QC is performed at every step: engineering,

production cycles, procurement, testing and site

installation.

All the factories of the TAMINI Group have their own

testing facilities suitable for the routine, type and

special test in accordance with IEC or IEEE (ANSI)

and other worldwide recognized Standards (ASA,

CSA, BSS, SEV etc.).

Short circuit withstand test, if required, can be

performed at the internationally recognized Italian

Laboratories of CESI. In the course of the years

Tamini has submitted several HV and MV power

transformers to short circuit test as requested by the

utilities or other end users including the 400 kV-250

MVA autotransformer shown at page 2.

The companies of the TAMINI Group definitely

comply with the most updated international

legislation for safety and environmental protection

aimed at reducing the noise level and using oil with

non-polluting ingredients (PCB was banned by

Tamini in the ‘ 70s) or non-flammable oil for specific

underground applications.

DESIGN AND MANUFACTURING

FACILITIES FOR POWER TRANSFORMERS

A staff of more than 40 engineers and qualified

technicians develop the engineering design and the

R & D. They are co-ordinated and controlled by

Senior Engineers with extensive experience in the

diversified fields of activity of the TAMINI Group.

manufactured at the workshop in Legnano, which

has 400 tonnes lifting capacity and testing facilities

rated for up to 765 kV.

Smaller transformers up to 25 MVA and 150 kV are

built in another workshop located in Valdagno, near

Vicenza.

Last, but not least, in the Melegnano workshop are

manufactured special industrial transformers, in

particular electric-arc furnace transformers and

rectifier transformers.

CUSTOMER AND FIELD ASSISTANCE

The importance of a satisfactory after-sales

assistance has always represented for TAMINI the

basic belief of its performance all over the world.

Supervision, erection and commissioning operations

as well as any service necessary during warranty

period and afterwards, are directed and co-ordinated

by the central office located at the Group

Headquarters and are carried out by qualified

technicians operating locally or coming from the

Group’s factories.

Any intervention is guaranteed immediately after

having identified the problem for the required

assistance.

In the main areas of North America and UK local

assistance for any prompt intervention is assured by

the TAMINI subsidiaries, located in the US and in

England. All the transformers leaving the TAMINI

factories have their own comprehensive Instruction

Manuals for Erection, Service and Maintenance

which are available in Italian, English, French,

German, Spanish, Russian, Dutch and other

languages as required.

75 MVA - 154.5/138 kV Regulating Transformer for Switzerland

220 MVA Substation Transformer for Luxemburg

250 MVA - 400kW Autotransformer under testing

100 MVA - 230 kV/26.4 kV Power Transformer for Canada

210 MVAr - 400 kV Shunt Reactor for ItalyInstallation of a Power Transformer


Winding Press Equipment

250 MVA - 400/155 kV Power Transformer

550 MVA – 400 kV Step Up Transformer under Testing

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DESIGN AND FEATURES OF POWER TRANSFORMERS

MAGNETIC CIRCUITS

The core is composed of silicon magnetic steel

sheets, insulated by inorganic “carlite” with high

chemical resistance to hot oil.

Pressboard insulation is interposed between

packages of sheets. The joints columns-yokes

are usually of the interleaved step-lap type.

The core columns are strongly fastened utilising

only highly resistant clamping tape; no through bolts

are used. The yokes are clamped by a strong steel

structure tightened by rods.

WINDINGS AND CONNECTIONS

The windings are made of electrolytic copper,

insulated with pure cellulose paper.

Stronger insulation is used on the terminal outlets.

Oil circulation through the windings is granted by

horizontal and vertical channels, according to the

type of winding. The winding type is designed

according the voltage value.

Usually HV windings

are of interleaved continuous disk type, while

LV windings are of transposed cable helical type.

Regulating and tertiary windings, when installed,

are also of helical type.

The internal connections from the windings

to the bushing terminals and to the tap-changers

are made by solid conductors or copper plaits

strongly insulated and clamped to wooden supports.

Special care is paid to winding stabilization,

which is achieved through a process sequence

of drying, in hot air oven, and tightening by tie-rod,

both on the single winding columns and on the

whole of each phase windings.

TERMINAL OUTLETS

HV and LV outlets are carried out through bushings

for connection to the external lines.

The bushings are of different types, according

to the specified design: they can be either

of the oil/air type or oil/oil, in case of connections

to cables in oil filled terminal boxes,

or also oil/SF6 for connection to SF6 filled

bus-bar ducts.

HV bushings are usually of the condenser type with

oil impregnated paper or epoxy resin insulation,

while MV or LV bushings are of the solid type.

Usually the bushings are fitted with external

porcelain insulators, however for the oil/air bushings

for outdoor installation, they can also be equipped

with silicon fins.

For LV and MV bushings the external connections

can be achieved through multi-contact elbow

bushings.

For installation in polluted areas the bushings

are designed with extended creepage distance

and special surface treatment.

One of two 553/338/215 MVA - 403/19/15.75 kV Step-up Transformers for a 800 MWcombined-cycle power plant

320 MVA - 230 and 400 kV GSU Transformer for Turbogas Power Plant 320 MVA - 230 kV Power Transformer

Phase Shifting Transformer (PST) 160 MVA - 230000/155000 kV 165 MVAr - 400 kV Shunt Reactor

Final Setting of Active Parts after Vapour-phase Treatment


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DESIGN AND FEATURES OF POWER TRANSFORMERS

separate banks, with or without cooling fans.

The cooling can also be achieved with oil forced-air

forced (OFAF) with oil to air coolers mounted

on the transformer side or in separate bank,

and also with oil and water forced cooling (OFWF),

with vertical or horizontal oil to water coolers

mounted on the transformer side.

TAP-CHANGERS

The transformers can be equipped either with

three-phase or single-phase motor driven on-load

tap-changers usually fitted on the HV side, and with

COOLING SYSTEMS

The transformers can be designed for any applicable

cooling system following the requirements of the

end users considering the site conditions whether

their installation is indoor or outdoor, in residential

or industrial areas and the size of the transformers.

The most used cooling systems for power

transformers are natural oil and air circulation

(ONAN) for the small-medium sizes, natural

oil-forced air (ONAN/ONAF) in one or two stages.

These systems are achieved by radiator banks,

mounted on the sides of the transformer tank, or in

TANK AND OIL EXPANSION TANK

The tank and the oil expansion tank, or conservator,

are made of welded steel sheets and

reinforced structure, designed to support total

vacuum. When the transformer is fitted with

an on-load tap-changer, the conservator has

two separate sections. The internal walls are painted

with a hot oil resistant coating while externally

the tank is painted according to procedures

as per the internal QA prescription, depending

on the site environmental conditions.

The anti-corrosion painting cycle of the tank,

conservator and external piping is always submitted

to the approval of the end users.

On specific request the conservator may feature

an oil preservation system (salad bladder) or it can

be replaced by a nitrogen cushion.

ACCESSORIES

The power transformers usually have the following

fittings and instruments subject to confirmation and in

accordance with the requirements of the

end-users:

Oil conservator as above described, complete

with oil level gauges and air breathers for both

transformer and on-load tap-changer sections

Buchholz relay cooling systems as above

described

Motor-driven on-load tap-changer, complete

with all necessary accessories and centralized

control box

Off-circuit tap-changer

Cooling equipment, depending on cooling method

Oil drain, filling, sampling and filtering valves

Oil and winding temperature indicators

HV, MV, LV bushings, as above described

Over-pressure vent

Marshalling box for signalling, control

and protection circuits

Grounding terminals or plate

Rating plate

Lifting lugs for the complete transformer and for

the core & coil set

Translation hooks

Jacking pads

Bi-directional wheel and when required:

Lightning arresters, counters, supports and other

surge protections

Current Transformers

Other specific accessories upon client’s request.

1600 kVA Special Transformer designed for Esplosive Enviroment 24/32/40 MVA Transformer for Lamar Utility Board, Colorado (USA)

116.4 (40) MVA, 230/63,23 ÷ 0/(10) kV Regulating Transformer for Aluminium Smelter

410 MVA - 400 kV Power Transformer

One of three Single-phase Step-down Transformers for a three-phase bank120/63/27MVA - 400/20/20 kV for Spain

off-circuit tap-changers, usually hand operated,

sometime motor driven.

The on-load tap-changers are suitable for local

and remote operation and are fitted with all the

accessories and with a marshalling cabinet mounted

on the transformer side.

They can feature a device for parallel operation.

Vacuum-type on-load tap-changers are now used

more and more.50 MVA - 220/132 kV Mobile Transformer Typical Substation Transformer for German Market


All sales and administrativeactivities of the Tamini Group are directed from the Group Headquarters

HeadquartersTAMINI Trasformatori s.r.l.Via Cesare Battisti 4320077 Melegnano MI - Italytel. +39.02.982051 fax +39.02.98230322www.tamini.it

Transformer Production FacilitiesTamini MelegnanoVia Emilia 3720077 Melegnano MI

Tamini LegnanoVia P. Ovidio Nasone20025 Legnano MI

Verbano TrasformatoriCorso Risorgimento 20928100 Novara NO

V.T.D. TrasformatoriVia Gasdotto 636078 Valdagno MI

North American OperationsTamini Transformers USA2803 Butterfield Road, Suite 385, Oak Brook, IL 60523 USAtel. 630.368.9907fax 630.368.9910

MILANO

MELEGNANO

Linate

S. DonatoMilanese

S. GiulianoMilanese

Paullo

TANGENZIALE OVEST

TANGENZIALE OVEST

PAULLESE

STRADA STATALE 415

VIA EMILIA

VIA CE

RCA

VIA CE

RCA

AUTOSTRADA DEL SOLE

A1

A1

A50

E35

SS9 SP39

SS9

SS415

SP415SS415

A51

Gps Coordinates:45° 21’ 40.70” N9° 19’ 46.40” E


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