20166E00

0 ISSUE TM STIN STIN SEPT. 94

REV. DESCRIPTION PREP'D CHK'D APPR'D DATE

Il presente documento RISERVATO ed di propriet dell'AGIP. Esso non sar mostrato a Terzi n sar utilizzato per scopi diversi da quelli per i quali stato inviato.This document is CONFIDENTIAL and the sole property of AGIP. It shall neither be shown to third parties nor used for purposes other than those for which it has been sent.

FUNCTIONAL SPECIFICATION

ELECTRIC POWER TRANSFORMERS

20166.EQP.ELE.FUN

Rev. 0

September 1994

20166.EQP.ELE.FUNRev. 0 September 94Sheet 2


FOREWORD

Rev. 0 Total Number of pages 22September 1994Issued to comply with the EEC directivesCancelling and replacing the following specification:a) 03012.EQP.ELE.SPC : GENERAL SPECIFICATION -ELECTRIC POWER

TRANSFORMERS



INDEX

1. GENERAL

1.1. Scope

1.2. Normative references1.2.1. European normative references

2. FUNCTIONAL NORMATIVE REQUIREMENTS

2.1. Definitions

2.2. Symbols and abbreviations

2.3. Operating Environment

2.4. Functional Requirements2.4.1. General characteristics2.4.2 Operating conditions2.4.3. Construction characteristics2.4.4. Packing for transport

2.5. Boundaries, limits and exclusions2.5.1. Usefulness

2.6. Ergonomics

2.7. Safety2.7.1. General prescriptions2.7.2 Protection against indirect contacts

2.8. Requirement for Quality Management and Assurance

2.9. Additional Requirements for Review2.9.1. Type Test2.9.2. Acceptance Test (individual)2.9.3. Special Test

2.10. Documentation2.10.1. Bid documentation2.10.2. Documentation subjected to Approval2.10.3 Documentation used by the Company for the system design2.10.4. Test documents2.10.5. Final technical documentation



1. GENERAL

1.1. Scope

This specification sets out the minimum requirements and the inspection plans for thesupply of static electric machines, later referred to as "Transformers", which are:

Dry sealed or oil power transformers Auto transformers Reactors

Any other additional information not covered by this specification will be specified inthe current rules and publications and in the project technical documentation,particularly:

Data Sheets Inspection Data Sheets (I.D.S.) Required Documentation Data Sheet (R.D.D.S.)

The technical requirements of this functional specification are based uponconsiderations of performances and functionality, therefore the instructions containedin this document are not meant to be discriminatory.Any alternative suggestions will be considered, provided that the compliance withwhat required in this document is satisfied both from functional and performancepoints of view.

1.2. Normative References

The Normative References and Publications that entirely define the transformers areherewith listed.When applicable, references will be made to the European Normative References ENand the Harmonisation Documents CENELEC or, in their absence, to the CEI/CEIUNEL Normative References and IEC Publications.In any case the plants shall comply with the rules and regulations issued by the LocalAuthorities and Organisations under which jurisdiction they are installed.



1.2.1. European Normative References

1.2.1.1. Power transformers - General rules

EUROPEANCENELEC

INTERNATIONALIEC

NATIONALCEI/CEI UNEL

TITLE( NOTE 1 )

HD 398.1 () 76 -1 () Power transformers

Part 1 : General

HD 398.2 () 76 -2 () Power transformers

Part 2 : Temperature rise

HD 398.3 () 76 -3 (

)14 - 4 Power transformers

Part 3 : Insulation levels and dielectric tests

--- 76 -3 - 1 () (Note 3) Power transformersPart 3 : Insulation levels and dielectric testsExternal clearances in air

HD 398.4 () 76 -1 () Plugs and connections

HD 398.5 () 76 -5 () --- Ability to withstand short-circuits

--- 616 () 14 - 7Terminal and tapping markings for powertransformers

EN 60551 () 551 () 14 - 9Determinations of transformer and reactor soundlevels

--- 606 () 1166 G Application guide for power transformers

--- 722 () S 699Guide to the lightning and switching impulsetesting of power transformers and reactors

--- --- 1167 GGuida per l'esecuzione delle prove suitrasformatori di potenza

--- 404 --- Magnetic materials

EN 60529 () 529 () 70 - 1 Degrees of protection provided by enclosures (IPcode)

HD 566 S1 () 85 () 15 - 26Thermal escalation and classification of electricalinsulation

--- 50 (421) ---International Electrotechnical Vocabulary.Chapter 421: Power transformers and reactors

1.2.1.2. Oil transformers - Specific rules

EUROPEANCENELEC

INTERNATIONALIEC


TITLE( NOTE 1 )

--- ---- 14 - 13

Trasformatori trifase per distribuzione araffreddamento naturale in olio, di potenza 50-2500 kVA, 50 Hz, con tensione massima Um peril componente non superiore a 36 kV.Parte 1: Prescrizioni generali e prescrizioni pertrasformatori con tensione massima Um per ilcomponente non superiore a 24 kV

--- ---CEI/UNEL

21015

Trasformatori trifasi AT/MT per la distribuzioneprimaria di potenza nominale 25, 40,63 MVA eper tensioni massime di AT, Um: da 145 kV a175 kV

--- ---CEI/UNEL

21016 Radiatori per trasformatori in olio



1.2.1.3. Dry-type transformers - General rules

EUROPEANCENELEC

INTERNATIONALIEC


TITLE( NOTE 1 )

HD 464 S1()HD 464 S1 A2HD 464 S1 A3

726 () 14 - 8 Dry-type power Transformers

--- 905 --- Loading guide for dry-type power transformers

HD 538.1 S1 () --- 14 - 12

Three-phases dry-type distribution transformers,power 50-2500 kVA, 50 Hz with a maximum Umvoltage for the component not exceeding 36 kVPart 1 : General prescriptions and prescription fortransformers with a maximum Um voltage for thecomponent not exceeding 24 kV

1.2.1.4. On-load tap-changers and reactors - General rules

EUROPEANCENELEC

INTERNATIONALIEC


TITLE( NOTE 1 )

EN 60289 () 289 () 14 - 5 Reactors

HD 367 S2 () 214 () 14 - 10 On-load tap-changers

--- 542 () 14 - 11 Application guide for on-load tap-changers

Notes for reading the table in paragraph 1.2.1.1 1.2.1.4.:

1) Titles of IEC publications, when common to CEI rules and CENELEC, aretranslated from the original relevant texts.

2) The Normative References and Publications with () have completecorrespondence with the CEI or UNI National ones. In the other cases the subjectis the same but the requirements are not entirely the same.

3) These rules cannot be applied to some small and special transformers mentionedin the same.In the case that no Rules exist for the above mentioned transformers they can beapplied completely or partially.



2. FUNCTIONAL NORMATIVE REQUIREMENTS

2.1. Definitions

Reference to the Normative References from paragraph 1.2 will be made fordefinitions and terminology.

2.2. Symbols and abbreviations

Reference will be made to the Normative References in paragraph 1.2. for symbolsand abbreviations.

2.3. Operating Environment

The transformers shall be designed and constructed for the environmental conditionsof the installation site defined in the Data Sheet.

If not otherwise specified, when H2S is present in the atmosphere, the followingconcentrations shall be used :

0.10 ppm of H2S continuously ; 5 ppm of H2S and 2 ppm of SO2 occasionally for brief periods.

The Supplier shall employ suitable protective devices and prove their effectivenessthrough appropriate components test certificates.

2.4. Functional Requirements

2.4.1. General conditions

Unless otherwise stated, the transformers shall be suitable for continuous service.

2.4.2. Operating Conditions

2.4.2.1. General

a) If not otherwise stated in the Data Sheet the transformers and the relativeequipment shall be suitable for operating in the NORMAL SERVICECONDITIONS indicated in the: Harmonisation Document CENELEC 398.1 for transformers immersed in oil; Harmonisation Documents CENELEC HD 464 S1 and 358.1 S1 for dry-type

transformers; European Rule EN 60289 for the reactors.

b) The supply voltage shall be sinusoidal and symmetrical and shall vary by 10%Un and in the range of 4% of the nominal frequency. The transformer shall alsobe able to supply nominal currents with an applied voltage equal to 105% of thenominal voltage.

c) In the case of transformers immersed in oil reference shall be made to the"Loading Guide" of the IEC 354 Publication or CEI S 564 Supplement .

d) In the case of the dry-type transformers reference will be made to the "LoadingGuide" of the IEC 605 Publication.



e) Even if not indicated in the Data Sheet, transformers making part of the samesupply and having the same characteristics (nominal voltage, linking group, ACvoltage) shall be able to operate in parallel to each other, even if they havedifferent powers, until they reach a maximum ratio of 3/1.

f) The admitted tolerance for the nominal characteristics shall comply with the limitsprovided in the Harmonisation Documents CENELEC HD 398.1, HD 464 S1 andEuropean Rules EN 60289.

2.4.2.2. Rated Power

a) The rated power shall be the one supplying the primary winding at theenvironmental and working conditions indicated on the Data Sheet.The preferred relevant values shall be chosen within the ones indicated on theNormative References .

b) The rated power shall be guaranteed for every plug position in the voltageconverter.A maximum rise in temperature of 10K over the foreseen limits of the NormativeReferences shall be introduced to contemporary frequency and voltage variationsas specified in 2.4.2.1.b).

2.4.2.3. Temperature rise

Unless otherwise stated on the Data Sheet, the temperature rises of the windings, ofthe magnetic circuits and of the metallic parts of the transformers designated tofunction under NORMAL SERVICE CONDITIONS as described at point 2.4.1., shouldnot exceed the specified limits in the tables of the following regulations:

Harmonisation Document CENELEC HD 398.1 for transformers immersed in oil; Harmonisation Documents CENELEC HD 46461 and 538.1 S1 for the dry-type

transformers; European Codes EN 60289 for the reactors.

Lacking indication, the following maximum rise in temperature shall be accepted:

OIL TRANSFORMERS AIR DRY-TYPETRANSFORMERS

ISOLATED RESINTRANSFORMERS

Temperature rise Temperature rise Temperature rise

60 K In oil Maximum, even ifinsulated with material 100 K In the global windings

65 K In the windings 100 K with an uppertemperature class. Orlower values in

100 K In the impregnated windings

75 K In the nucleus of 105%Un on the main plugaccordance with theclass of the usedinsulating materials

If the transformers are meant for operations different of those indicated in 2.4.1,reductions of the limits of rise in temperature shown in the relative NormativeReferences shall be applied.



2.4.2.4. Ability to withstand short circuits

Transformers shall be suitable to withstand without being permanently damaged thethermal and dynamic effects of external short-circuits in the conditions specified by theReference Rules. The short-circuit voltage values in the network shall be thatindicated in the Data Sheets.

2.4.2.5. Short-circuit voltage

Failing any indication on the Data Sheets, the characteristic values indicated in theNormative References shall be considered.

2.4.2.6. Insulation levels

Unless otherwise stated on the Data Sheet, the transformers shall have an insulationlevel suitable to withstand the voltage values of the tests indicated in the NormativeReferences:

Harmonisation Document CENELEC HD 398.1 for transformers immersed in oil; Harmonisation Documents CENELEC HD 46461 and 538.1 S1 for the dry-type

transformers; European Codes EN 60289 for the reactors.

2.4.2.7. Environmental, climatic and fire behaviour classes for the dry-type transformers

The environmental, climatic and fire behaviour classes for the dry-type transformersshall be defined on the Data Sheets according to the Harmonisation Document HD464 S1.Failing any indication, the dry-type transformers shall be defined according to thefollowing classes:

Class E1 : Environmental (with reference to humidity, condense and pollution ); Class C1 : Climatic (with reference to the minimum temperature to which the

transformer can be subject to ); Class F1 : With reference to fire behaviour.

The Manufacturer shall state and indicate on the nameplate the environmental,climatic and fire behaviour according to what is specified on the reference Rules.

2.4.3. Construction Characteristics

2.4.3.1. General

The transformers shall be sized and shall have a rated power standardised accordingto the Normative References CEI/UNEL as much as possible.

2.4.3.2. Nucleus

It will consist of silicon steel magnetic plates according to the IEC 404 Publications.



2.4.3.3. Windings

a) Unless otherwise stated on the Data Sheets, the windings shall be made ofelectrolytic copper according to the CEI/UNEL Rules.

b) The windings shall be fixed in such a way as to withstand the thermal anddynamic stress caused by a short-circuit at the terminals of the secondarywinding of the duration of 2 seconds without permanent deformation caused by ashort-circuit at the terminals of the secondary winding.

c) The star, triangle and zigzag connections of the phase windings shall be markedaccording to the Normative References.

2.4.3.4. Tank

a) The oil-type transformer tank shall be in a single piece and grade of protection forboth the outdoor and indoor installation.

It shall be sized in such a way as to allow as much as possible the transportationof the transformer ready for operation.

b) In non-sealed transformers, the tank complete with core, windings, conservatorand radiators shall be suitable to operate with autoclaves under vacuum at theabsolute pressure of 0.4 kPa for the treatment of the oil even in absence of liquid;the allowed vacuum drop shall not exceed 5.3 kPa in 6 hours.

c) The above transformers shall be able to pass a test with pressure of 55 kPa for24 hours without developing any oil leaks (verified with talcum powder).

In the sealed transformers without breathers, the tank shall have an expansionvolume above the oil level, filled with a dry, inert gas.

The tank complete with core, windings and radiators shall be designed to pass a100 kPa pressure test without developing any oil leaks (verified with talcumpowder).

The cover shall be welded to the tank. Seals with gaskets, when necessary, shallbe provided only under the minimum level of oil (in cold conditions) and the boltsand nuts of the flanges shall be welded.The filling nozzle shall be sealed using an anti-loosening cap.

The transformer shall be constructed in such a way that the internal pressureshall not exceed 34.3 kPa, during normal operating services, with an oiltemperature range between -5 and +90.

2.4.3.5. Cooling system

a) Identification symbols

The transformers shall be identified according to the cooling method used, asindicated in the Data Sheets, using the symbols prescribed in the NormativeReferences.



b) Radiators

The radiators shall conform with the CEI/UNEL 21016 Rules as much aspossible.Unless otherwise stated on the Data Sheets, the transformers immersed in oilshall be cooled as follows:

Up to 630 kVA, with a corrugated tank or fixed radiators; Between 630 kVA and 2000 kVA, with pipes welded directly to the tank,

appropriately distanced in such a way as to allow the cleaning and the re-painting or, as an alternative, with portable radiators provided with blockvalves;

Above 2000 kVA, with portable radiators provided with block valves and plugsfor the draining of the oil.

2.4.3.6. Bushings and external connections

a) When applicable, the bushings will comply with the CEI/UNEL 21010 Rules.

They shall be complete with terminal strips, bolts and accessories suitable for thecoupling of the pipes specified in the Data Sheets.

The windings exposed to over-voltages of atmospheric origin shall be fitted withco-ordination spark gaps which can be adjusted by at least +15%.

Those for a voltage over 52 kV shall be of the capacitor type.

All the windings shall be marked with symbols corresponding to the wiringdiagram referred to on the nameplate; such symbols shall comply with theNormative References .

The plug connections shall include, besides the terminals of the cable, all thenecessary materials for carrying out the terminations of the cable and theearthing.Failing any indication, the cables shall be of the armoured multicore type.

b) The protection and disconnecting chambers shall be provided with an opening forinspection and maintenance.Inside them a stainless steel AISI 316L bolt shall be installed with a diameter notlower than 10 mm for the earthing of the cables shields and armours.The penetration walls for single core cables shall be of a non-magnetic material.When indicated in the Data Sheet, an anticondensation heater of armour type,controlled by a thermostat and protected against accidental contacts shall beprovided in the air tanks for voltages over 3 kV .

c) The chamber for the protection of terminals shall be built in 2 sections so that thetransformer may be removed without disconnecting the cable termination .

d) The cable terminations in oil shall include a Buchholz relay with contacts forevery phase complete with block valves and blind closing flanges.

2.4.3.7. Voltage control

a) Off-circuit tap-changer

If not otherwise stated on the Data Sheets, the control field of the voltage tap-changer shall be of 2 x 2.5 % Un and shall be sized to at least 125% of themaximum service current (ONAF for forced cooling).



The off-circuit tap-changer shall be complete with a releasing device to avoidincorrect positioning.

For transformers up to 3150 kVA the selector shall be on the cover, its positionbeing easily accessible.

For larger transformers it shall be on one side at eye level.

The tap-changer shall be provided with a position indicator; it shall positively latchitself only in the operating positions.

Provision shall be made for limit stops and a locking device to lock the selector inthe chosen position.

b) On-load tap-changer

The control field shall be indicated on the Data Sheet.It shall comply with the prescriptions provided for by the HarmonisationDocument CENELEC HD 367 S2 and by the "Application Guide" of the CEI 14-11or IEC 542 Rules.

The switch of the on-load tap-changer shall be placed inside its own oil casingand the oil shall be separate from that of the transformer. Therefore, it shall beprovided with a separated oil conservator with its own proper gas relay.

The switch contacts shall be easily accessible for maintenance and replacement,without having to open the transformer or remove the conservator.

The tap-changer shall be provided with a manual control device consisting of aremovable handle and an electric motor-driven control device for local operationsand remotely interlocked.When the parallel running is foreseen, the control shall operate either as aprincipal or as a spare equipment.

All control auxiliaries and the necessary accessories shall be installed in a fixedbox and fixed to the transformer at eye level with IP 54 degree of minimumprotection.The accessories will also include:

a position indicator visible from outside through a window; a device for remote indication of the position selected and the incorrect

position (n.2 repetition contact sets of the tap-changer position wired to aterminal strip);

an operation counter; an anti-condensation automatically controlled heater, A.C. supplied; a lamp for lighting the auxiliaries box; an internal nameplate with an indelible diagram of the control circuits.



2.4.3.8. Accessories and auxiliaries

a) General

Unless otherwise stated on the Data Sheets, the accessories and auxiliarydevices shall be those indicated in the TABLE 1, and shall be installed, ifapplicable, as indicated in CEI-UNEL 21012 Rule.

The electrical contacts shall be NC for the alarms and NO for the protective blockcircuit.

They shall be connected with terminal strips as indicated in the relevant diagramsenclosed to the Data Sheet

Unless otherwise stated on the Data Sheets, the ventilation motors and pumpsshall be three-phases and of standard dimensions in accordance with theHarmonisation Document CENELEC HD 53.1 S2 and shall have a degree ofprotection not less than IP 54.

Failing any indication, the motors circuits shall be protected with symmetricalautomatic circuit breakers which shall have an interruption power not less than 10kA and thermal relays properly co-ordinated and compensated for temperaturevariation.The control circuits shall be derived from power circuits through an isolatingtransformer of suitable power and with a secondary voltage as specified in theData Sheet.



TABLE 1

STANDARD ACCESSORIES FOR THE TRANSFORMERS

ITEMACCESSORY DESCRIPTION

OIL TRANSFORMERS(Power kVA)

DRY-TYPETRANSFORMERS

REF. TI

CEI-UNEL_ 630 631+3150 > 3150 (****)

1. (*) Dielectric liquid conservator X X X --- Pr. 1772

2. (*) Buchholz gas relays X X X ---

3. (**) Pressure vacuum gauge X X X ---

4 Tank oil draining device X X X ---

5 Press filter couplings X X X ---

6. (*) Vacuum pump couplings --- --- X ---

7 Oil sampling device X X X ---

8 Thermowell X X X ---

9 Dial thermometer for oil --- X X ---

10 Temperature detector --- --- X X

11 Bursting disk or pressure valve X X X ---

12 Radiator isolating devices --- X X ---

13 Skids X --- --- X (***) 21011

14 Swivel wheels --- X X X (***) 21011

15 Jacking points --- --- X ---

16 Hooks for horizontal traction --- X X X

17 Lugs for lifting removable parts X X X ---

18Lugs for lifting whole transformer or intransport position X X X X 21012

19 Lugs for coolers lifting --- X X ---

20 Earthing terminals X X X X 06131

21 Electrical circuit marshalling box X X X X

22 Control panels for auxiliary devices --- --- X X

23 Oil-air-water flow indicators --- --- X ---

24 Nameplates X X X X21014

25 Openings and hutches --- --- X ---

26 Temperature control box --- --- --- X

27 Metal enclosure --- --- --- X

28 Set of special tools X X X X

(*) Excluded sealed transformers without conservator(**) Only for sealed transformers(***) According to what indicated on the Data Sheet(****) Reference valid only for oil immersed transformers of 502500 kVA, Um not over 24

kV according to the CEI-UNEL 21010 Rule



b) Special requirements for the accessories

The accessories listed in TABLE I shall be of the type and installed as follows:

ITEM 1: Oil or other liquid conservator filling device having a diameter of not less than 50 mm; liquid level indicator with markings at -20C, +20C and +85C and

provided with an electrical alarm contact; silica gel breather installed at eye level; draining device.

ITEM 2: Gas relays

For the oil of the transformers it shall be Buchholz's type provided withtwo electrically independent alarm and trip contacts. it shall be fittedbetween two isolating valves and with a bypass valve.A section of the pipe shall be supplied so that it may be used for itsreplacement (only for units > 3150 kVA).

For the oil container of the on-load tap-changer the gas relay shall beof the pressure wave with contacts type, bypass valves and equivalentsection of pipe.

ITEM 3 : Pressure vacuum gauge

One dial type pressure vacuum gauge indicating low and highpressures, including a NC contact for low pressure and a NO contactfor high pressure.

ITEM 4 : Oil draining device

Consisting of a valve of corrosion resistant material with a 11/4"connection threaded gas male fitting closed by an end cap andpositioned on the conservator side.The valve can also be used as :

Lower connection for the filter press ( ITEM 5 ); Oil sampling device (ITEM 7 ) only if it allows small samplings and

it is suitably installed.

ITEM 5 : Filter press connections

Consisting of two valves as for ITEM 4, the first being positioned onthe tank base on the conservator side and the other on thediametrically opposite side.For transformers rated more than 3150 kVA, the top connection shallbe positioned close to the bottom one.Characteristics of valve shall be as ITEM 4 and can also be used asfollows :

The bottom valve as an "Oil draining device" (ITEM 4); The top one as a "Vacuum pump connection" (ITEM 6)

ITEM 6 : Vacuum pump connections

As in ITEM 5 only if suitable.ITEM 7 : Oil sampling device



As that in ITEM 4 but of a suitable diameter.The device in ITEM 4 is not necessarily suitable for sampling.

ITEM 8 : Thermowell

Consisting of a 3/4 " gas pipe, 120 mm long, with a blind end,extending approx. 30 mm, externally threaded and including an endcap of corrosion resistant material. The threading shall be protectedwith silicon grease.In the case of transformers with power > 3150 kVA, two thermowellsshall be installed.

ITEM 9 : Dial thermometer

Installed in a suitable pocket as in ITEM 8, and including an alarmcontact and a block contact.

ITEM 10 : Temperature detector

Shall be of platinum of 100 at 0C and positioned in the hottest pointsas follows:

Dry type transformers : n.3 in the LV windings Oil transformers between

3,150 kVA and 40 MVA : n.3 in the nucleusn.1 in the oil

Oil transformer over40 MVA : n.6 on the top yoke

n.6 in the columnsn.4 in the oil

ITEM 11 : Bursting disk or pressure valve

For transformers with a conservator it shall include a cover closed by aspring in the correct position.For sealed transformers, it shall include two electrically independentcontacts, one normally open and one normally closed.

ITEM 12 : Radiator isolating devices

Consisting of a butterfly valve for every tank connection.

ITEM 13 : Skids

Unless otherwise stated on the Data Sheet, the dimensionalcharacteristics of skids shall be as indicated in the CEI-UNEL 21011Rules.

ITEM 14 : Swivel wheels

Unless otherwise stated on the Data Sheet, the dimensionalcharacteristics of the wheels and the quantities shall be as indicated inthe CEI-UNEL 21010 and 21011 Rules.



ITEM 18 : Lugs for lifting the whole transformer

In the case of transformers of up to 2500 kVA lifting eyebolts shall beprovided of quantities and dimensions as specified in the CEI-UNEL21012.

In the case of large transformers which cannot be lifted in one pieceprovisions shall be made for the possibility of lifting them ready fortransport.

ITEM 20 : Earthing terminals

Earthing terminals shall be provided as indicated in the CEI-UNEL21010 Rules.Failing any indication, two stainless steel AISI 316L plates shall beprovided with bolts having a diameter not less than 12 mm, positionedin the bottom on the incoming side of the cables.For large transformers (> 40 MVA) plates with two holes and bolts of16 mm shall be provided.

ITEM 21andITEM 22: Electrical circuit marshalling box or control panels for auxiliary devices

When provided, they shall be largely sized and shall have a degree ofprotection IP 55. They shall be located in an easily accessible position.The panels shall be equipped with an anti-condensation resistancecontrolled by a thermostat and protected by an automatic andthermomagnetic circuit breaker or fuse-switch disconnector. Unlessotherwise indicated, inlets of all cables shall be from the bottomthrough stainless steel AISI 316L cable glands.Inlets of cables from the top shall only be permitted for cable systemsin conduits.

ITEM 24 : Nameplates

The identification nameplates of the machines with the relevantelectric and constructive data shall be produced and positioned asindicated on the CEI-UNEL 21010 Rules and 21012 NormativeReferences .Failing any indication they will be made of stainless steel AISI 316L.

ITEM 26 : Temperature control box

When required, it shall be of digital type to be fitted on the front of thepanel by the Company, with alarm, release and visible control oftemperature of each single phase contacts.If not otherwise stated the feeding voltage shall be of 220 V, 50 Hz.

The box shall be complete with linking cables to the temperaturedetector box, fitted on the transformer. The length of such cables shallbe specified on the Data Sheet.



ITEM 27 : Metal Enclosure

The metal enclosure suitable to contain the transformer and forprotection against direct contacts and against atmospheric agentsshall be made from structural steel and plates, painted as indicated onthe Data Sheets.The protection degree of such an enclosure shall be suitable for theinstallation site; however, for indoor installation they shall not be lowerthan IP 21 and for outdoor installation it shall not be lower than IP Wand 23.The enclosure internals shall be accessible by means of small doorsor portable panels fitted with socket head screws for accidentprevention.The necessary ventilation, if not otherwise requested in the DataSheet, shall be ensured through a series of slits placed on the top andbottom sides.

2.4.3.9. Assembly accessories and special tools

For every type of transformer making part of a single supply, two series of keys andspecial tools for fitting and maintenance shall be supplied (see also TABLE 1 ITEM28).

2.4.3.10. Spare parts for the operation of the transformers

The material listed below and the additional required material shall be supplied.The Supplier shall be able to suggest further required material, as per his experience.

ITEM COMPONENT DESCRIPTION QUANTITIES

1 HV insulators (note 1 ) 1 for each type

2 LV insulators 0.10 N with a minimum of 2

3 Mercury thermometer, scale 0 to 150 1 for each type andtransformer power

4 Pump for checking the acid and gas relays(Buchholz) for the gases analysis 1 for each installed type

5 Air drier for conservator 1 for each installed type

6 Gaskets 1 for each installed type

7 Oil circuit valves 1 for each installed type

8 Finishing paint 2 kg for each colour

NOTE : N = number of equal and interchangeable pieces installed on thetransformers, aim of the supply.

(1) Only when the transformer is sent with HV insulators attached on it.



2.4.3.11. Protective treatments

a) Painting

Painting and the relevant protective treatments will be done in accordance withthe prescriptions contained in the Data Sheet.

b) Tropicalisation

When required in the Data Sheet, equipment and materials will be subjected totropicalisation treatments in accordance with the relevant ReferenceSpecification.

2.4.4. Packing for transport

Transport arrangements will be defined by the Supplier according to the Company'scriteria.

The large transformers can be transported without feed through insulators, ventilators,radiators, conservators and any big accessory.During the transport and until the complete filling up with oil, one atmosphere ofnitrogen kept under pressure by using suitable equipment including a manometer shallbe maintained in the tank.

The components and accessories of the transformers shall be fixed and fastened soas to withstand vibrations and friction due to transport (road, train, sea) and thenecessary loading, unloading and installation operations carried out with liftingequipment.

Accelerations will be particularly considered:

axial, critical in train transport transversal, critical in road transport vertical, critical in sea transport



2.5. Boundary conditions, limits and exclusions

2.5.1. Usefulness

This functional specification is also applicable to some small transformers and specialtransformers according to what is prescribed in the Normative References .

2.6. Ergonomics

Unless otherwise stated in the Data Sheet, the overall noise level shall be within thefollowing values:

Transformers with a naturally cooling system : as in TABLE DIN 42540; Transformers with forced ventilation : 80 dBA at 1 m.

The sound pressure level shall be measured according to what is prescribed in theHarmonisation Document CENELEC HD 399 S2.

2.7. Safety

2.7.1. General prescriptions

The Supplier will guarantee that the panels will be designed adopting good practice torespect the safety prescriptions contained in the Normative References.

2.7.2. Protection against direct contacts

The transformers shall be provided with an earthing plate and for the dry-typetransformers with protective casing indicated on TABLE 1 ITEM 20 and 27

2.8. Requirements for Quality Management and Assurance

Any additional requirements of Quality Management and/or Quality Assurance arecontained in the relevant management specification enclosed in the request for bid.



2.9. Additional Requirements for Review

When required, they will be indicated in the Inspection Data Sheet (I.D.S.) and aresubdivided in:

Type test; Acceptance test (individual); Special test.

For any inspection and test not included in the normative references and in thisSpecification and requested in the Inspection Data Sheet (I.D.S), the executionprocedures shall be defined on a case by case basis.

2.9.1. Type test

The type test aims at guaranteeing the compliance of a specific type of transformerwith the Normative References and the original design.The type test shall be carried out on a prototype of the transformer and the Suppliershall be fully responsible for its execution.The Company shall be exclusively responsible for the acceptance of transformers thatare similar to those supplied as prototypes and shall reserve the right to request theexecution of some of the type tests.The type tests of the auxiliaries and accessories are not required if they comply withthe Normative References and are installed according to the Constructor'sinstructions.The Supplier of the transformers will check that the type tests of the auxiliaries andaccessories have been carried out and that the relevant documentation is produced.

2.9.2. Acceptance test (individual)

The acceptance test aims at guaranteeing, by verification of documents and executionof a limited but important number of inspections and tests, the compliance oftransformers with the original design and prototype as well as with the Company'srequirements, and to detect any faults in materials and fabrication. The acceptancetest (individual) shall be carried out on all transformers of the supply, assisted by theSupplier.For the acceptance tests of the auxiliaries and accessories, the considerations listedabove for the type tests shall apply, without prejudice to the fact that they shallwithstand the inspection and tests described in the Inspection Data Sheet (I.D.S).

2.9.3. Special Test

It includes tests and inspections not provided for in the type and acceptance tests,that the Company may require from time to time.The list of tests and inspections and any criteria of execution will be indicated in theInspection Data Sheet (I.D.S.).



2.10. Documentation

The Supplier will deliver to the Company all the documents indicated in the RequestedDocument Data Sheet (R.D.D.S.), in accordance with the agreed terms and schedule.The technical documentation will be written in the official language indicated in theData Sheet and using the symbols indicated in the CENELEC, CEI Rules and in IECPublications.

2.10.1. Bid Documentation

The Supplier will include in his bid all the information and documentation required inthe Data Sheet (R.D.D.S.).

2.10.2. Documents Subjected to Approval

The approval of the documentation by the Company, if necessary, will refer to theformal verification of the parameters indicated in the design's documents only.

2.10.3. Documentation used by the Company for the system design

The Supplier will deliver to the Company all the documentation necessary to theexecution of the system design and to the installation of the supplied system.

2.10.4. Test Documents

The Supplier will deliver to the Company, within the schedule and in the way indicatedin the Data Sheet, all the certificates relating to the type, acceptance and specialtests.

2.10.5. Final Technical Documentation

The final technical documentation, with the only exception of the Supplier andSubsuppliers catalogues and publications will include the following references:

name of the Supplier; name of the Company; identification tag of the transformer, as indicated by the Company; title of the document; details of the Company's orders.

and will consist of:

a) Design and Installation instructions;b) Operations instructions;c) Maintenance instructions.

The description and drawings can be contained in catalogues and documents of theSupplier, as long as they satisfy the following conditions:

they contain all data and information required in their final form they are relevant to the type supplied and the materials included in the supply are

clearly identified amongst those in the document.

The documentation subject to approval will be integral part of the final documentationapproved by the Company.

20166E00

Documents

Transcript of 20166E00