Table of contents

Table of contents 1

1 OVERVIEW 2

2 STANDARDS 2

3 AMBIENT CONDITIONS 3

4 FEEDING NETWORK PARAMETERS 3

5 AUXILIARY VOLTAGES 3

6 TECHNICAL DATA 4

7 COOLING EQUIPMENT 6

8 ON LOAD TAP CHANGER MOTOR OPERATED 7

9 MINERAL OIL 7

10 FITTINGS AND ACCESSORIES 810.1. GROUNDING CONNECTIONS ...............................................................................................................910.2. FILTERS AND PROTECTIONS

...............................................................................................................9

11 PAINTING 9

12 INSPECTION AND ROUTINE TESTS 10

13 TRANSPORT 10

14 TYPE TESTS 11

15 ENCLOSURES 11

1 OVERVIEW

This specification reports the requisites which the furnace transformer must fulfil for supplying a LRF furnace, purchased and to be installed in a steel plant complex. It also reports the standards to be adopted, the technical data obtained from the specific service, processing modalities for the final and working documentation relative to the supply. The supplier is expected to provide the transformer complete with all the components, including those that have not been specified, but necessary for installation and for a good operation. The instructions for markings, shipping address, instruction for filling the packing list, plates, which TAYBAH STEEL will advise upon request by the supplier before packing will be carried out; reference to the order convention must however be made. The supplier, upon delivering the supply, is expected to provide all the special storage prescriptions in an environment as described in chapter 3; if he does not, he will be held responsible for any damage resulting from not fitting these prescriptions, and shall replace the damaged parts.The scope of supply is:

num. 1 5.0MVA + 10%, 33000 / 281 180 V, three-phase oil immersed furnace transformer for feeding the LRF Furnace;

num. 1 set of three surge arresters phase-ground connected with surge counter;

num. 1 set of three surge arresters phase-phase connected;

num. 1 set of primary RC-filters;

num. 1 set of secondary C-filters and fuses;

num. 1 set of mechanical supports, insulators and electrical connections for the installation of surge arresters, RC-filters and secondary C-filters and fuses;

YES NO OPTION Mineral oil in quantity necessary for good operation.

The supplier is requested to quote as OPTION any items that are considered as his “standard” supply for this kind of equipment and any cost savings type of design (as long as it does not affect the performance required) and any already built transformer with similar characteristics.

The supplier is held to:- require all documents mentioned within the present technical specification;- notify and require any missing data necessary for the detail engineering of the transformer;- notify any possible inconsistency among data and parameters indicated on the delivered

documents.

2 STANDARDS

Design, manufacturing, testing, etc. shall be in accordance with IEC and mainly to the following standards:

IEC 60076 POWER TRANSFORMERS IEC 60358 COUPLING CAPACITORS AND CAPACITOR DIVIDERS IEC 60099 SURGE ARRESTERS Local accident prevention standard Standards, laws, directives highlighted by TAYBAH STEEL

Any certificate to export the transformer and protection equipment to the destination country and to put transformer/protections in service must be provided by the manufacturer.Wherever applicable, the CE marking must be provided.All equipment, which shall be delivered, but which doesn't meet the above mentioned standards, shall be subject to the purchaser’s approval.

3 AMBIENT CONDITIONS

The LRF Transformer shall operate under the following environmental conditions:

1 Altitude ≤ 1000 m.a.s.l.2 Distance to the sea Very near3 Min / Max relative humidity 10 / 90% (1)4 Climate Desert5 Installation Indoor, not exposed to atmospheric

overvoltages6 Min / max outdoor ambient air temperature 10 / +55 C (1)7 Min / max transformer room temperature 10 / +40 C (1)8 Min / Max storage temperature 10 / +45C (1)9 Seismic level Zone 1 according to UBC standards –

importance factor according to table 16-K, UBC Chap.16, Div III (1)

(1) These values shall be given or confirmed during detailed engineering stage

4 FEEDING NETWORK PARAMETERS

1 Service voltage 33 kV 10%2 Test voltage at rated frequency for 1 minute 70 kV3 Impulse withstand voltage 170 kV4 Frequency 50 Hz 2 % (1)5 Neutral grounding system Grounded trough earthing resistor (1)6 Short circuit fault level (min / max) (1)7 Series reactor rated impedance / taps 65 Ohm (tap at 100-85-70-55-40-0%) (1)8 Type and number of cables

- from substation to furnace switchgear (1)9 Type and number of busbars

- from furnace switchgear to transformer (1)10 Type of furnace circuit breaker (1)11 LV side short circuit impedance (R+jXL) 0.65 mΩ + j 2.56 mΩ 3% (1)

(1) These values shall be given or confirmed during detailed engineering stage

5 AUXILIARY VOLTAGES

1 Motor voltage 3 phase (2) 400V 6% - 50Hz ≤ 20kA (1)2 Auxiliary voltage 1 phase AC (to be created

internally through a single phase transformer)230V - 50Hz (1)

R E MAR K : all auxiliary contacts of protection devices shall be suitable for 110Vdc (1) and 230V, 50Hz

(1) Preliminary, to be confirmed(2) A single feeder will be made available for the transformer control box; the OLTC auxiliary

box shall be fed from the control box.

6 TECHNICAL DATA

Equipment code (1)Quantity of transformers to be supplied 1Transformer type Mineral oil – immersedNumber of phases 3Cooling system OFWFRated power 5.0 MVAOverload 10%Load cycle (worst condition) Continuous at 5.5MVAShort circuit fault level at 33kV for design scope 1000 MVA (1)Max. time of short circuit duration 2 sMax. over excitation at on and no load 10%Short circuit voltage referred to rated power atmaximum secondary voltage

8%

Rated primary voltage 33000 VRated frequency 50 HzSecondary voltage range 281 – 180 V (2)Secondary voltage range at full power 281 – 265 V (2)Secondary voltage range at constant sec. current 265 – 180 V (2)Max. secondary current including overload 12.0 kATypical harmonic generation by the furnace, referred to the max transformer current: integration time3sec., harmonic currents rms value at 95% of daily distribution function (according to IEC std.) (3)Harm. order 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th 12th 13th 14th ≥15th

Percentage 1.5 3.5 0.7 2.8 0.5 1.5 0.2 0.1 - 0.1 - 0.1 - -

Winding connectionPrimary Secondary

Star or Delta Delta openInsulation class A AType of insulation Fully uniform Fully uniformHighest voltage for equipment Um 36 kV 3.6 kVRated power freq. short duration voltage 1min 70 kV 10 kVRated lightning-impulse withstand voltage 170 kV 40 kVNumber of terminals 3 See annex 01Winding material Cu CuType of terminals Bushings on top of tank

with flag type connectors (4)

Copper plates on top oftank according to

annex 01 (5)Bushing creepage distance ≥ 25 mm/kVTap changer On-load oil type, motor operatedType of secondary voltage regulation Booster or Variable Flux RegulationNumber of tap positions 13 (2)Number of tap positions at full power 3 (2)Induct overvoltage 2 rated

voltageSecondary current overload 2 max current for 20 s every 10 min. or equivalent rms

Max. overtemperature of winding at rated power(IEC 60076) with inlet water temp. 35°C (6)

55 K

Max. overtemperature of oil at rated power(IEC 60076) with inlet water temp. 35°C (6)

50 K

Global sound pressure level 1 m away 80 dB (1)

The manufacturer has to confirm all above mentioned data in the offer

(1) These values shall be confirmed during the detailed engineering stage.(2) The secondary voltages are preliminary and will be adjusted or confirmed during detailed

engineering stage. Steps within 10V are requested over the range at maximum power, whilst15V are requested over the range at constant secondary current. Final secondary voltages for all taps have to be approved by DANIELI before the manufacturing starts.

(3) The value of the harmonic currents can raise up to twice the declared values during the short term period.

(4) The position of the primary bushings has to be designed taking into account the insulatingdistance to be kept to the border of the area clear for the secondary circuit – see annex 01.

(5) The external high current circuits connected to the LV bars get out from the furnace transformer room as shown on annex 02.

(6) The supplier must anyway provide a suitable design to limit the overtemperature at the hot-spots to values in compliance with the lifetime of the transformer stated by the applicable standards, considering carefully the overload cycle of the transformer.

RE M A RK S :

The design of the transformer must take into account the typical current distribution during regular service of LRF furnace (see annex 03 for reference).

The design of the transformer must take into account the possibility of working with unbalanced secondary currents (worst condition with max current on two phases only and the third one unloaded).

By designing the equipment, the manufacturer must take in consideration also typical interharmonics.

The tank for transformer shall be designed to withstand full vacuum without the need of external bracing. The tank shall withstand the hydrostatic pressure provided by a head equal to twice the height of the transformer.

The design of transformer and on load tap-changer shall take into consideration the amplitude of the current fluctuations due to the furnace operation (three phase steady state current Ik with electrodes in short circuit up to 2.0 - 2.5 times the max transformer current) and the frequent energization (up to 100 times/day) of the transformer itself equipped with RC filters.

The transformer shall be designed and manufactured taking into consideration the need to limit the temperature of the external surface of the tank to values stated by the applicable norms and suitable for the equipment and in any case not higher than 125°C on the single hot spots.

The internal LV high current bars must be well supported (from the bottom). The supplier must indicate on the layout drawing the electro-magnetic clearance contour around

the equipment (for electrical equipment, small metallic parts and metallic parts forming closed loops). The information is needed to avoid thermal and electrodynamic effects on neighbouring metallic parts.

7 COOLING EQUIPMENT

Type of cooling OFWFInlet water temperature + 35 °CMax temperature raise 10 °KCooling water quality Industrial (1)Water pressure Min. 3 bar - Max. 7 barType of heat exchanger Double pipeNumber of coolers 1 100 % of the maximum power including overload

(*)Available cooling water 15 m3/h (1)Type of flanges Slip-on / raised face PN 16 – UNI 2278 – UNI 2229 (1)

(1) These values shall be confirmed during detailed engineering stage.

The heat exchanger shall be equipped with nr.1 oil pump, motor starter equipment and local controls with a switch for remote control located in a sealed box and a switch for the selector of the pump.The electrical motor circuits shall be protected with thermal overload contactors and MCB (all auxiliary circuit breakers installed shall be provided with 1NO + 1NC auxiliary contacts as minimum figure).All circuits to be wired and terminated at a serviceable height.

Fittings and accessories for each cooler YES NONum. 1 oil flow indicator with alarm contact for low flow Num. 1 water flow indicator with alarm contact for low flow Num. 1 oil/water leakage indicator with alarm contact Num. 1+1 thermometers for inlet/outlet oil temperature Num. 1+1 thermometers for inlet/outlet water temperature Num. 1 oil pressure gauge Num. 1 water pressure gauge Num. 1 set of shut off valves for inlet and outlet water and oil

circuits

(*) A 15% of margin must be adopted by designing the coolers in order to take into account the equipment ageing and possible sediment due to cooling water.

8 ON LOAD TAP CHANGER MOTOR OPERATED

The three-phase on load tap changer shall be arranged for assembling inside the transformer tank with the diverter switch in a separate compartment. The housing of the diverter switch must be oil-tight and prevent mixing of the diverter switch oil with the transformer oil.The tap changer shall be provided with a quantity of mechanical position as equal as possible to the quantity of secondary voltage step s . The supplier shall indicate in the offer the type and the number of mechanical position of the tap-changer. Duration for tap to tap <= 5.5 seconds.A counter is provided for tracking the numbers of operations carried out; the supplier shall take into account a normal number of operations of 800 per day.The tap changer is equipped with auxiliares and accessories which are located in a sealed control box placed on the transformer. For the operation, control and protection of the on-load tap changer, the following devices must be included:

- local / remote selector with auxiliary contacts;- local electrical and mechanical control;- remote control possiblility by means of contacts from the furnace;- local position indicators;- separate position indications by means of following potential free contacts wired to 3 separate

terminal block: break before make (2 set) and make before break (1 set); in case of delta/star connection of the primary of the transformer, the make before break contacts must be designed for a current of 10A and suitable interlocks between the tap changer and the furnace circuit breaker must be foreseen;

- interlock between the electrical and mechanical control;- interlock between the local and remote electrical control;- interlock for operation which exceed the maximum and minimum positions (both electrical and

mechanical);- thermostat controlled heater for the control box;- predisposition for oil pump filter unit for cleaning the OLTC oil during trafo operation, fixed

mounted on the transformer.

Suitable facilities shall be provided on the top cover and walls of the tank (different solutions to be agreed during detail engineering stage) in order to extract both the diverter switch only and the whole OLTC without removing the complete cover of the transformer.

Suitable facilities shall also be provided to separately extract the top and bottom part of the wholeOLTC, in order to reduce the extraction height of the tap-changing equipment.

9 MINERAL OIL

The mineral oil shall be inhibited (or addition of specific passivator shall be provided to avoid any copper corrosion phenomenon due to sulphure in transformer oil), with characteristics in accordance to standard IEC 60296. The supplier is expected to indicate the quantity and physical characteristics of first-fill oil, instruction to dry the transformer oil before connecting it to the power lines and instruction for filling the transformer, adding (topping up) and mixing mineral oils in the transformer.

10 FITTINGS AND ACCESSORIES

Standard fittings and accessories for the oil filled transformerConservator, divided in two compartments for tap changer and transformer oil Each conservator compartment is equipped with :

- Magnetic dial-indicator type oil level indicator readable at floor level with alarm contacts for min. and max. oil level

- Dehydrating breathers- Oil filling valves

Gas and oil actuated relay with double float with two alarm and two trip contacts fortransformer oil (shut off valves provided on both sides of the relay) Buchholz relay

Down pipe from gas and oil actuated relay, terminating into a gas sampling and testing devicefitted with a stop cock for collecting gas trapped in the relay

Oil surge relay with two trip contacts for tap changer oil Pressure relief device with two trip contacts for the transformer Pressure relief device with two trip contacts for the OLTC Oil temperature indicator (dial type thermometer) with two alarm and two trip contacts Winding temperature indicator (dial type thermometer) with two alarm and two trip contacts Nr. 2 (+2 spare) Thermometer pockets placed in the top cover of the tank Nr. 2 Earthing terminals (one on the LV side to connect the secondary C filter protections andone on the opposite side)

Separated earthing connections of core and core clamps accessible without lowering the oil Motor and manual operated on-load tap changer fitted with local + remote tap position indicator Rating and diagram plate Predisposition for oil filter unit to clean and dry the OLTC diverter switch oil during operation Primary bushings and secondary plates replaceable without removing the tank cover Lifting lugs and haulage lugs Jacking pads placed on the same axis of the wheels Drain, filling, sampling and filter valves Valve diagram plate and single valve labels Air releasing device Under carriage with bi-directional wheels Marshalling kiosk/box for housing all equipment and devices required for tap changing system,cooling system and temperature measurement as well as control system

Removable plates for cleaning operations Facilities to extract both the diverter switch and the whole OLTC without removing thecomplete cover of the transformer

Facilities to separately extract the top and bottom part of the whole OLTC, in order to reducethe extraction height of the tap-changing equipment

RE M A RK S :

All interlocking, status, tripping and alarm signals shall be of potential free type and suitable to operate correctly within auxiliary circuits at 24 - 110Vdc and 110 - 230Vac. All tripping signals shall be provided with one contact for direct tripping (to lock-out relay or opening coil of the MV breaker) and one contact to be wired to the control system for monitoring purpose (alarm/trip signals to be handled through NO contacts).

All circuit breakers and disconnectors installed within the auxiliaries shall be equipped with 1NO+ 1NC auxiliary contacts as minimum figure.

All selector switches installed within the auxiliaries shall be equipped with auxiliary contacts to be wired to the control system for monitoring purpose.

The three-phase incoming line shall be protected with main isolating switch CB. The electrical motor circuits shall be protected with thermal overload contactors and MCB. The auxiliary, control and signal cables on the transformer must be protected by metal conduit,

metal hose, metal cable channel or shall be of armoured type. All circuits shall be wired and terminated at a serviceable height. Circuits interlocked / interfaced with external devices must be marked / highlighted according to

the applicable standards.

10.1. GROUNDING CONNECTIONSThe transformer will be connected to the earthing grid of the plant from one earthing terminal of the tank only. The auxiliary voltage supply can be provided with or without its own earthing connection (depending on the induced currents on earthing conductors).All equipment installed aboard the transformer, in addition to RC filters, secondary C filters and surge arresters, must be grounded directly on transformer tank or to its earthing terminal. The manufacturer shall avoid any abnormal transformer heating and eddy currents on the transformer and the earthing connections of the auxiliary and main equipment, taking into account the current on the secondary circuit. The expected current on the earthing circuits of the transformer and related equipment installed aboard shall be indicated by the supplier and checked during commissioning phase. The earthing connections must be designed taking into consideration the max current due to fault and eddy currents. The manufacturer has to check the need to insulate the transformer from under carriage wheels and from cooling water circuit. In the same way the supplier has to verify any need to insulate the auxiliary equipment of the transformer.

10.2. FILTERS AND PROTECTIONSRC filters, surge arresters and secondary C filters are included within the scope of supply. The supplier of the transformer is held to design the protections starting from the main electrical parameters and characteristics of the plant and its equipment and to suitably install the protecting devices on the transformer or close to it (inside the transformer room). The following equipment has to be designed, manufactured and installed as minimum (see also typical 3-phase diagram on annex 04):

Nr. 3 surge arresters in ground-phase connection with counter, on the primary side of the transformer; minimum discharge capacity: 8kJ/kV.

Nr. 3 surge arresters in phase-phase connection, on the primary side of the transformer (fork- configuration not acceptable); minimum discharge capacity: 8kJ/kV.

Nr. 3 RC-filters on the primary side of the transformer. The capacitors shall be designed to limit theovervoltages due to the circuit breaker switching operations to a value 2.5 p.u. The design of the resistances shall take into account the need to reduce at the maximum the oscillatory phenomena subsequent to the possible arc reignition on the furnace circuit breaker. The resistances shall be designed to withstand a current equal to 3 In for a time of 15 min every30min. The value of intrinsical inductance of the filter must not exceed 5 – 10 H.

Nr. 1 set of C-filter on the secondary side of the transformer. Preferred design: each capacitor built- up with several capacitor units with individual fuses and internal discharge resistance (discharge time to 50V ≤ 5 min). Cable length to be kept as shortest as possible (< 700 mm). The C-filter shall be designed to limit the overvoltages on the secondary side to values incompliance with the voltage withstand characteristics of the transformer (in any case 10

p.u.) Nr. 1set of additional external inspectable discharge resistors (discharge time to 50V ≤ 5 sec)

installed in parallel to the above mentioned secondary C-filters. Nr. 1 set of fuses for the protection of the C-filter.Nr. 1 set of electrical connections, mechanical supports (supports for the secondary C filters of non-

magnetic steel in order to avoid overheating problems due to magnetic field) and insulators for all the accessories and for the RC filters, surge arresters and secondary C filters installation (including earthing connections). The installation of the primary RC filters and secondary C filters must be carried out so that it has to be possible to measure the current of each filter on its ground connection by means of current clamps or current transformers (supplied by other).

Nr. 1 set of drawings, manuals, safety and maintenance instructions related to the RC-filters, surge arresters and C-filters to be included into the transformer manual.

11 PAINTING

The final coat of painting shall be RAL 7023, and in any case confirmed during the ordering phase. A detailed painting cycle complying with the ambient conditions stated within chapter 3 shall be delivered by the manufacturer.

12 INSPECTION AND ROUTINE TESTS

Routine test shall be performed according to standards in chapter 2, following the manufacturing and testing program / schedules already approved by the Purchaser. During the construction program and the factory acceptance test, the purchaser must be allowed to visit with its own personnel as well as the final client, the manufacture works in order to check the development of the construction works and to verify its conformity to the technical specification and to check that the guarantee values are fulfilled. To assure the quality of the equipment, reviews and acceptance tests are important. The supplier must arrange a design review (according to CIGRE document 12.22 and other applicable), if required by the purchaser or final customer. The quality assurance is basically divided into two parts:1) Factory Acceptance Test (FAT). Before the delivery of the equipment and systems, those have to be tested at the supplier's facilities by the supplier and under the supervision of purchaser's personnel.45 days before the programmed date of the individual routine tests at work shop, the supplier shall advise the Purchaser. The Purchaser shall confirm his presence at tests within 30 days. During the FAT all routine acceptance test listed in the respective standards in chapter 2 shall be done, including:- measurement of winding resistance, voltage ratio, polarity and phase displacement;- measurement of short-circuit impedance and load loss for all secondary voltage steps;- measurement of no-load loss and no load current;- separate source voltage and induced overvoltage withstand test;- tests on on-load tap-changer;- insulation resistance to earth and between the windings;- hydrostatic pressure withstand test.During the short circuit test and no load test (at Vn+10%), the current within all the earthing and equipotential connections must be checked and indicated in the test report.The short circuit test must be carried out with rated secondary current and the test must last as long as possible (minimum 30 min) without using the cooling system. During the test the temperature on 8-10 different points must be measured trough PT100 and recorded.The supplier is responsible for arranging the FAT. A punchlist is written for the remaining items.These have to be corrected before shipping, if possible and latest before site commissioning of the equipment and system starting. The punchlist is included to the FAT report, written by the purchaser.2) Site Acceptance Test (SAT). This test shall be performed on site when the plant is energized / in operation. In this test, mainly the various operational functions are verified according to the functional specification. During the SAT, mainly the same items as per FAT shall be tested (including cold and hot test stated within the transformer manual), but as a complete system with all external communications. It is performed by the supplier, under purchaser's supervision. The supplier is responsible for arranging the SAT, upon the purchaser's request. A punchlist is written for the remaining items and included to the SAT report, written by the purchaser. If no items remain, the system is considered as delivered.

13 TRANSPORT

The transport of the transformer could be arranged by the manufacturer with or without oil (final solution to be communicated during the technical discussion); the tank shall be filled with nitrogen or dry air (partially in case of transformer delivered with oil inside), whose pressure shall be supervised during the transportation. A vibration recorder shall be mounted on the transformer during the transportation and sent back to the supplier when the transformer is on the final site. The stored data have anyway to be checked on site in the presence of TAYBAH STEEL’s responsible.The operator manual shall describe in details the transport modalities, the procedures of inspection on arrival at destination and the storage modalities, proposing dedicated sections to the following arguments:

1 – Transport from the factory and handling2 – Automatic nitrogen or dry air supply device3 – Shock recorder4 – Inspection on arrival at destination5 – Storage of transformer, accessories and oil

One copy of the manual must be packed and delivered along with the main equipment.

14 TYPE TESTS

The following type tests shall be separately quoted as OPTION and performed on request:

YES NO OPTION

- Lightning-impulse withstand test on primary windings - Lightning-impulse withstand test on secondary windings - Temperature rise test

15 ENCLOSURES

Annex 01 Transformer Outline ( the drawing must be confirmed after order)Annex 02 Typical (for reference only) layout of the secondary high-current connectionAnnex 03 Typical current distribution on LRF furnaceAnnex 04 Typical 3-phase diagram of transformer and related protectionsAnnex D DocumentationAnnex S Spare partsAnnex T Data to be given by the manufacturer

ANNEX 02

TYPICAL LAYOUT OF SECONDARY

HIGH-CURRENT CONNECTION

ANNEX 03

TYPICAL CURRENT DISTRIBUTION

ON LRF FURNACE

ANNEX 04

TYPICAL 3-PHASE DIAGRAM

OF TRANSFORMER AND PROTECTIONS

Certified by OneDoc DP0GYU-GE11-E9200-ES101 Rev.00-E 22/28 #1263460Ladle furnace - Furnace Technical Specification - 5MVA+10% Furnace Transformer

ANNEX D DOCUMENTATION

SCHEDULE

AND DELIVERY MODALITIES

The following are the suggested documents to be supplied by Inductotherm and roughly scheduled as hereinafter indicated:

Item Documents Submission Date

1 Document List2 Transformer and protections dimensional drawing with supply

limits, take over point and load for foundations

3 Technical specification of protections4 Surface treatment program and painting process5 Detailed vendor list for all market components6 Supplier’s manufacturing & testing program / schedules7 List of the available Type Test Certificate8 Spare parts and consumable list9 Quality Control Plan (QCP) and Inspection and Test Schedule

(ITS)10 Quantity and physical characteristics of first-fill oil11 Equipment and apparatus list12 Rating plate with diagram and transformer data13 Cooling and auxiliary equipment schematic diagrams14 Load tap changer scheme15 Schematic diagram of cooling system (P&I diagram)16 Three phase diagram17 Drawing of earthing connections of transformer and related

equipment (arresters)18 Quality Control and Test Manual (QCTM)19 Instruction to dry the transformer oil before connecting it to

the power lines20 Instruction for filling, adding (topping up) and mixing mineral

oils in the transformer21 Erection, training, operation and maintenance manuals,

instructions for cold test / commissioning and safety instructions

22 Catalogues/manuals of all equipment used for construction23 Packing list of transformer and protections

24 Certificate of Routine Tests of transformer and protectionsaccording to standards

25 Documents and declaration of conformity according to IECstandards

26 Documents and certificate to export transformer andprotections into the destination country and to put them in service

ANNEX S

SPARE PARTS

The spare parts for commissioning stage and for two-years operation shall be separately quoted by the supplier including at least the following items:

nr. 1 H.V. bushing nr. 1 Buchholz relay

nr. 1 Oil thermometer nr. 1 Oil flow indicator

nr. 1 Oil level indicator nr. 1 Oil pump

nr. 1 Dehydrating breathers nr. 1 Water flow indicator

nr. 1 set of gaskets nr. 1 set of tap-changer contacts or vacuum pole

The order of spare parts shall be handled after defining the actual spare-part list.

ANNEX T

DATA TO BE GIVEN

BY THE MANUFACTURER

WEIGHT AND DIMENSIONS1 Weight of complete transformer in service (oil included) kg2 Weight of transformer's oil kg3 Weight of transformer's active part kg4 Weight of transformer's windings kg5 Weight of transformer's core kg6 Weight of the transformer ready for transport (please specify

wheter the shipment is provided with or without oil)kg

7 Overall length / width / height of the transformer in service mm8 Overall length / width / height of the transformer ready for transport mm9 Tank wall thickness mm

10 Wheels interaxis mmELECTRICAL CHARACTERISTICS

1 Type of secondary voltage regulation2 Short circuit voltage at 281/265/180 V %3 Short circuit losses at 75 C and 281/265/180 V kW4 No-load losses at rated voltage kW5 No-load current at rated voltage A6 Current density for each winding A/mm2

7 Magnetic field induction at VN and fN T8 Inrush current peak value (taking in consideration a short circuit

power at 33kV of 1000 MVA) and time constantA

sec9 Max. overtemp. of winding at rated power / at maximum power

including overloadC / C

10 Max. overtemp. of oil at rated power / at maximum power includingoverload

C / C

11 Power losses in the ambient kW12 Bushings Manufacturer and type13 Dielectric oil type14 Detailed description of the transformer with respect to coils, magnetic circuit and oil circuit .

TAP – CHANGER CHARACTERISTICS1 Manufacturer and type2 Contact life / Interval maintenance3 Duration for tap to tap s4 Motor power kW5 Motor power of pump for oil filter unit kW

COOLER CHARACTERISTICS1 Manufacturer and type2 Water flow l/min3 Pressure max. bar4 Design value of the inlet/outlet oil temperature C5 Design value of the outlet water temperature C6 Oil pump motor current hot/cold oil (at 400 V) A / A7 Valves Manufacturer and type8 Water flow for any other mechanical part to be separately cooled l/min