TECHNICAL SPECIFICATIONS FOR DRY TYPE AUXILIARY …

TEİAŞ-MYD2015-042.1

TECHNICAL SPECIFICATIONS FOR DRY TYPE AUXILIARY SERVICE POWER TRANSFORMERS WITH EPOXY RESIN COATED WINDINGS (MV/ LV)

The original version of this technical specification has been prepared in Turkish and in case of any inconsistency between English and Turkish, the Turkish language shall prevail.

PREPARED : JULY 2015 REVISION – 1 : NOVEMBER 2019

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Technical Specifications For Dry Type Auxiliary Servıce Power Transformers With

Epoxy Resin Coated Windings

CONTENTS

1. GENERAL .............................................................................................................. 3

1.1. Subject and Scope ............................................................................................ 3 1.2. Standards .......................................................................................................... 3 1.3. Operating Conditions ........................................................................................ 6

2. TECHNICAL CHARACTERISTICS ........................................................................ 7 2.1. Type .................................................................................................................. 7

2.2. Electrical Characteristics ................................................................................... 7 2.2.1. Operation Regime ..................................................................................... 9 2.2.2. Operation under Overvoltage .................................................................... 9 2.2.3. Losses (Maximum values without tolerance) ............................................. 9 2.2.4. Partial Discharge ..................................................................................... 10

2.2.5. Tolerances ............................................................................................... 10 2.2.6. Transient Overload .................................................................................. 10

2.3. Structural Characteristics ................................................................................ 11

2.3.1. Magnetic Circuit (Core) ............................................................................ 11 2.3.2. Windings .................................................................................................. 11 2.3.3. Tap Changer ........................................................................................... 12

2.3.4. Cooling Type ........................................................................................... 12 2.3.5. Connections and Terminals ..................................................................... 12 2.3.6. Overload Protection ................................................................................. 12

2.3.7. Chassis and Auxiliary Equipment ............................................................ 13 2.3.8. Housing ................................................................................................... 14

2.3.9. Sign Plate ................................................................................................ 14 2.3.10. Precautions Against Corrosion .............................................................. 14

3. TESTS .................................................................................................................. 15

3.1. Tests on Fully Assembled Transformer at Factory .......................................... 15 3.2. Type Tests ...................................................................................................... 15

3.3. Special Tests................................................................................................... 16 3.4. Routine tests ................................................................................................... 17

3.5. Field Tests ...................................................................................................... 18

3.6. Sampling ......................................................................................................... 18 4. MATTERS RELATED WITH TESTS AND ACCEPTANCE CRITERIA ............... 19

4.1. Tests ............................................................................................................... 19 4.1.1. Type Tests and Special Tests ................................................................. 19 4.1.2. Routine Tests .......................................................................................... 20

4.1.3. Acceptance Tests .................................................................................... 20 4.2. Acceptance Criteria ......................................................................................... 20 4.3. Acceptance Procedure .................................................................................... 20

ANNEX –I/A LIST OF WARRANTED CHARACTERISTICS FOR DRY TYPE AUXILIARY SERVICE POWER TRANSFORMERS WITH EPOXY RESIN COATED WINDINGS (MV/LV) (33/0.4 kV, 160 KVA) .............................................................. 22 ANNEX –I/B LIST OF WARRANTED CHARACTERISTICS FOR DRY TYPE AUXILIARY SERVICE POWER TRANSFORMERS WITH EPOXY RESIN COATED WINDINGS (MV/LV) (33/0.4 kV, 250 KVA) .............................................................. 26 ANNEX –I/C LIST OF WARRANTED CHARACTERISTICS FOR DRY TYPE AUXILIARY SERVICE POWER TRANSFORMERS WITH EPOXY RESIN COATED WINDINGS (MV/LV) (33/0.4 kV, 400 KVA) .............................................................. 30

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ANNEX –I/D LIST OF WARRANTED CHARACTERISTICS FOR DRY TYPE AUXILIARY SERVICE POWER TRANSFORMERS WITH EPOXY RESIN COATED WINDINGS (MV/LV) (33/0.4 kV, 500 KVA) .............................................................. 34

ANNEX-II DRY TYPE AUXILIARY SERVICE POWER TRANSFORMERS WITH EPOXY RESIN COATED WINDINGS (MV/LV) LIST OF DEVIATIONS .................. 38

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TECHNICAL SPECIFICATIONS FOR DRY TYPE AUXILIARY SERVICE POWER TRANSFORMERS WITH EPOXY RESIN COATED WINDINGS (MV/ LV)

1. GENERAL 1.1. Subject and Scope These specifications cover the technical characteristics and test conditions of three phase Dry Type Auxiliary Service MV/LV Power Transformers with Epoxy Resin Coated Windings up to a voltage of 36 kV and rated power of 1600 kV, which will be supplied for use in meeting the internal needs of Transmission Centers. Unless otherwise specified in the specifications and their annexes, the transformers shall be supplied in the form of complete units with all their hardware indicated in the specifications. The types and technical characteristics of the transformers to be supplied are indicated in the list of Warranted Characteristics. In the following parts of these specifications, only the expression “Transformer” shall be used instead of “Dry Type Auxiliary Service Power Transformer with Epoxy Resin Coated Windings (MV/LV)”. 1.2. Standards Unless otherwise specified, the transformers included in the scope of these specifications shall be compliant with the latest editions of Turkish Standards Institute (TSE/TS), European Electrotechnical Standardization Committee (CENELEC/EN), International Electrotechnical Commission (IEC/IEC) as indicated in the following table and following parts of these specifications.

Standard Number Standard Name

(Turkish/ English) TSE International

equivalent

TS EN ISO 9001 EN ISO 9001 Quality management systems - requirements Quality management systems - requirements

TS EN IEC 60076 -11

IEC 60076-11 Power transformers – Part 11: Dry type transformers

Power transformers – Part 11: Dry type transformers

TS IEC 60076-12 IEC 60076-12 Power transformers – Part 12: Loading guide for dry type power transformers

Power transformers – Part 12: Loading guide for dry type power transformers

TS EN 60076-1 IEC 60076-1 Power transformers – Part 2: Temperature rise for liquid-immersed transformers

Power transformers – Part 2: Temperature rise for liquid-immersed

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transformers



equivalent

TS EN 60076-3 IEC 60076-3 Güç transformatörleri – Bölüm 3: Yalıtım seviyeleri, dielektrik deneyler ve havadaki harici yalıtma aralıkları

Power transformers- Part 3: Insulation levels, dielectric tests and external clearances in air

TS EN 60076-4 IEC 60076-4 Güç transformatörleri – Bölüm 4: Yıldırım ve anahtarlama darbe deneylerine kılavuz – Güç transformatörleri ve reaktörler

Power transformers – Part 4: Guide to the lightning impulse and switching impulse testing – Power transformers and reactors

TS EN 60076-5 IEC 60076-5 Güç transformatörleri – Bölüm 5: Kısa devre dayanım yeteneği

Power transformers – Part 5: Ability to withstand short circuit

TS IEC 60076-8 IEC 60076-8 Power transformers: Application Guide

Power transformers Part 8: Application Guide

TS EN 60076-10 IEC 60076-10 Power transformers Part 10: Determination of Sound Levels

Power transformers Part 10: Determination of Sound Levels

TS 8756 EN 60721 IEC 60721-1 Classification of environmental conditions – Part 1: Environmental parameters and their severities

Classification of environmental conditions – Part 1: Environmental parameters and their severities

TS 3033 EN 60529 IEC 60529 Degrees of protection provided by enclosures (IP code) (for electrical equipments)

Degrees of protection provided by enclosures (IP code) (for electrical equipments)

TS EN 61672-1 IEC 61672-1 Electroacoustics Sound Level Meters – Part 1: Specifications

Electroacoustics – Sound Level Meters – Part 1: Specifications

TS EN 60947-1 IEC 60947-1 Low Voltage Switchgear and Controlgear- Part 1: General Rules

Low Voltage Switchgear and

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Controlgear- Part 1: General Rules

TS EN ISO 1461 Hot dip galvanized coatings on fabricated iron and steel articles – specification and test methods

Hot dip galvanized coatings on fabricated iron and steel articles – specification and test methods



equivalent

TS EN 50588-1 EN 50588-1 Medium power transformers 50 Hz, with highest voltage for equipment not exceeding 36 kV- Part 1: General requirements

Medium power transformers 50 Hz, with highest voltage for equipment not exceeding 36 kV- Part 1: General requirements

IEC 60050 Series International electrotechnical vocabulary

Series International electrotechnical vocabulary

TS EN 60071 IEC 60071 Insulation coordination series

Series insulation coordination EN 60071 series

TS EN 60068-3-3 IEC 60068-3-3 Environmental testing: Part 3: Guidance; seismic test methods for equipment

Environmental testing: Part 3: Guidance; seismic test methods for equipment

TS EN 60085 IEC 60085 Electrical insulation- Thermal evaluation and designation

Electrical insulation- Thermal evaluation and designation

TS 2051 EN 60270 IEC 60270 High Voltage test techniques – Partial discharge measurements

High Voltage test techniques – Partial discharge measurements

TS EN IEC 60332-3-10

IEC 60332-3-10 Tests on the electric and optical fiber cables under fire conditions Part 3-10: Test for vertical flame spread of vertically-mounted bunched wires or cables - Apparatus

Tests on the electric and optical fiber cables under fire conditions Part 3-10: Test for vertical flame spread of vertically-mounted bunched wires or cables - Apparatus

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Electrical accessories, components and other auxiliary hardware shall be compliant with the relevant TSE and IEC standards, even if not indicated in the above standards. In relation with the materials, for which those standards do not exist, the Bidder shall propose applicable standards, provided that the approval of the Purchaser is obtained. In case of differences between TSE and IEC standards, written permission of the Purchaser shall be obtained on the standard to be applied on matters showing differences. All chemical, physical and dielectric characteristics of the materials used in the production of composite transformers shall be compliant with the characteristics prescribed in the relevant ASTM (American Society for Testing and Materials) or DIN (Deutches Institut für Normung) or norms of European Union countries. If the above standards and/or documents are modified in the stages after opening the bids received for the transformers, the modification or edition that was valid on the date of the bid shall apply. 1.3. Operating Conditions Unless otherwise specified, the transformers shall be suitable for use under the following operational conditions. The following conditions are the operational conditions and the values in the technical specifications and their annexes are given in accordance with those conditions. If the Buyer has any requests different from those conditions, the Manufacturer shall perform its works in compliance with the relevant standards, taking this situation into consideration. The changes that may occur in the Technical Specifications and if any in the design as the result of those works shall be submitted to the Buyer for approval.

OPERATIONAL CONDITIONS

Place of use Indoor

Elevation 1000 m unless otherwise specified

Ambient temperature

Minimum -250C

Maximum +400C

24-hour average +300C

One –year average Under +250C

Ambient air pollution Small

Maximum relative humidity (24-hour average)

93%

Exposure to earthquake (*)

- Horizontal acceleration 0.5g

- Vertical acceleration 0.25 g

Environment Class E2

Climate Class C2

Fire Class F1

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(*) Auxiliary service power transformers shall withstand the horizontal and vertical earthquake acceleration values and shall be designed so as to prevent any damage to any of its units; the projects, drawings and materials necessary for the assembly of the auxiliary service power transformers and the earthquake resistance calculations of auxiliary service power transformers shall be submitted by the Contractor. 2. TECHNICAL CHARACTERISTICS The dry type MV/LV power transformers included in the scope of these specifications shall be used as reducer transformer or auxiliary service transformer at the transmission centers and shall have the following technical characteristics, unless otherwise specified in the List of Warranted Characteristics. 2.1. Type

- Three –phase, two winding - Dry type with epoxy resin coated windings - Indoor - With housing (if requested by the Buyer) - Housing protection class IP21 - Protection class without housing IP00 - Voltage setting in no-load operation - Natural air cooling (AN) (*) (*) The transformers shall be designed so as to be suitable for future fan addition for use in case of transient overload. 2.2. Electrical Characteristics

a) Rated voltages

MV winding : 6,3 10,5 15,8 33

LV winding : 400/231 V

b) Maximum system voltages

Primary : 7.2 12 17.5 36

Secondary : 1.1kV

c) Rated frequency : 50 Hz (1)

d) Rated powers : 50-100-160-250-400-500-630-800-1000-1250-1600 kVA

e) No-load voltage adjustment

Adjustment winding : On MV side

Adjustment class : Fixed flux (IEC 60076-1 CFVV)

f) Voltage setting field and number of taps

Rated voltage (kV) : ±2x2.5% 30-31, 5-33-34.5-36

Number of taps : 5 5

No-load rotation ratio (kV)

: MV±2x2.5%/ 0.4 30-31.5-33-34.5-36/0.4

g) Adjustment tap powers : Equal to rated power in all taps

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h) Connection group : Dyn 11, Dyn 5

i) Short circuit impedance (in the main tap, at reference temperature) Short circuit impedance shall be chosen as 6% in the nominal voltage tap of the transformers. 1 Taking into consideration that the nominal frequency of the system, which is 50 Hertz (Hz), can increase to 52.5 Hz or decrease to 47.5 Hz under unstable operational conditions, the transformers shall be designed for continuous operation in this frequency range. i) Short Circuit Thermal Strength The period of the current to be used in the calculation of thermal strength against short circuit must be 2 seconds. j) Rated insulation levels - MV winding

Rated voltage 6.3 kV 10.5 kV 15.8 kV 33 kV

Impulse withstand voltage (kV-peak) (1.2 – 50 µs)

60 75 95 170

One minute power frequency withstand voltage (kV – effective)

20 28 38 70

- LV winding

One-minute power frequency withstand voltage (kV – effective): 3 kV

k) Temperature increase limits - Windings For the insulation of windings, (F) or (H) temperature class insulation materials shall be used. (IEC 60076-11: 2018 Table-2).

Insulation material temperature class

Class (F) Class (H)

Insulation system (hot point) temperature (0C)

155 180

Average winding temperature increase (maximum) (Resistance measurement method) (K)

100 125

- Core and metal sections The temperature increase in the core shall never reach the temperatures that will damage the metal sections and the materials adjacent to them.

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l) Reference temperature (T ref) - Short circuit impedance voltage and load losses shall be given at the below reference temperature in accordance with the temperature class of the insulator material and shall be warranted.

Insulator Material Class Reference temperature (oC)

Class (F) 120

Class (H) 145

- For transformers with windings made of insulator materials of different

temperature classes, the reference temperature of the winding in the highest insulation temperature class shall be used.

m) Sound power levels (LWA) (maximum values without tolerance)

Minimum values included in IEC 50588-1 are selected.

Transformer rated power (kVA)

50 100 160 250 400 500 630 800 1000 1250 1600

6,3-11-15.8 kV LWA db

49 51 54 57 60 61 62 64 65 67 68

33 kW LWA dB

51 53 56 59 62 63 64 66 67 69 70

NOTE: The values in the table are the highest values. Tolerance shall not be applied and the transformers shall be rejected in case the limits are exceeded.

2.2.1. Operation Regime The transformers shall be suitable for continuous operation at 100% unbalanced loading.

2.2.2. Operation under Overvoltage The transformers shall be suitable for operation without exceeding the temperature increase limits indicated in the specifications - So as to provide the rated current at a voltage equal to 105% of the rated voltage. - Continuously in no-load position at a voltage equal to 110% of the rated voltage. 2.2.3. Losses (Maximum values without tolerance) The following data are taken from IEC 50588-1 standard.

Rated Voltage (kV)

Rated power (kVA)

Losses in No-load Po (W) (Ao)

Load Losses Pk (W) (Ak)

6.3-10.5-15.8 kV ≤50 200 1500

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100 160 250 400 500 630 800 1000 1250 1600

280 400 520 750 900 1100 1300 1550 1800 2200

1800 2600 3400 4500 5600 7100 8000 9000 11000 13000

Rated Voltage (kV)

Rated power (kVA)

Losses in No-load Po (W) (Ao)

Load Losses Pk (W) (Ak)

33 kV

≤50 100 160 250 400 500 630 800 1000 1250 1600

230 325 460 600 865 1035 1265 1495 1785 2070 2530

1650 1980 2860 3740 4950 6190 7810 8800 9900 12100 14300

NOTE: The values in the table are the highest values. No tolerance shall be applied and the transformers shall be rejected in case of exceeding the limits. 2.2.4. Partial Discharge The maximum value of partial discharge must be 10 pC. 2.2.5. Tolerances If the values found as the result of the test for the transformers included in the scope of order are the same as the warranted values within the tolerances indicated below, the transformers shall be deemed to be compliant with these specifications. - No-load change ratio : ±0.5%

(in the main tap) - Short circuit impedance at rated current : ±10%

(in the main tap)

- No-load current : +30% 2.2.6. Transient Overload The transformers shall be suitable for transient overload in accordance with “Loading rules for dry type transformers” IEC 60076-12.

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The transformers shall be designed to be suitable for fan addition in the future to be used in case of transient overload. The transient overload curves at 100C, 200C and 300C ambient temperature shall be given in the bid. 2.3. Structural Characteristics All materials used in the construction of the transformers shall have a structure suitable for the place and purpose of use, shall be of first class quality, strong and shall be selected from materials having superior physical and electrical characteristics. The design and manufacture of the transformers shall be performed with the newest technical applications and best workmanship and all work safety factors shall be taken into consideration in the widest sense. 2.3.1. Magnetic Circuit (Core) The core shall be made of silica sheet with smooth surfaces, which is high-quality, cold extruded, the crystals of which are oriented, which does not age and which has high magnetic permeability. The attachments shall be cut with 450 and step-lap technology shall be applied. Each plate shall have the insulation that will not deteriorate under pressure and with the effect of temperature. The sheet steels constituting the core and their insulation materials shall be designed so as not to allow the occurrence of harmful changes in the physical and electrical characteristics of the transformer during its usable life. All necessary precautions shall be taken to minimize the no-load losses and noise in the core construction. 2.3.2. Windings Electrolytic copper or aluminum conductors shall be used for LV and MV windings and the conductors shall be insulated with high-quality (F) or (H) temperature class insulation materials. The windings shall be designed and manufactured so as to resist the thermal and mechanical forces that will occur in cases of short circuit, and to the insulation strength tests indicated in the specifications without being damaged. The transformers shall be safe against fire and for this purpose, they shall be manufactured using insulation materials that are flameproof or noncombustible, which extinguish when the arc is over and which do not emit toxic and flammable gases that pollute the environment. MV windings shall have vacuum cast epoxy resin. On LV windings, epoxy resin impregnated insulation material (band winding) or vacuum cast epoxy resin shall be

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used. The characteristics of epoxy resin shall be given in the List of Warranted Characteristics. 2.3.3. Tap Changer The voltage adjustment tap ends of the high voltage winding shall be placed on the windings and tap changing operation shall be performed using connection bridges in de-energized condition. The tap ends shall be marked so as to be indelible and so as to show the tap, to which they belong. 2.3.4. Cooling Type The cooling type of the transformers shall be natural air cooling (AN). Furthermore, the transformers shall be designed to be suitable for fan addition in the future to be used in case of transient overload. 2.3.5. Connections and Terminals LV and MV windings shall be suitable for external connections from the upper or

lower side as indicated in the list of warranted characteristics.

LV phase and neutral terminals shall be tin coated copper or aluminum fishplate with

appropriate section and shall be placed on the upper and lower core compression

profiles using insulators as required.

For LV connections, connection lugs suitable for cable or flat aluminum or copper bar

connection shall be provided together with the transformer.

Bimetal materials shall be provided together with the transformer for LV phase and

neutral terminal connections.

Triangular connections shall be made with copper or aluminum conductors so as to

be compliant with the windings.

2.3.6. Overload Protection The transformers shall be equipped with “Temperature Protection System” against overheating and thermal forces due to high environmental temperature and overloading. The Temperature Protection System shall consist of temperature sensors (PT100) and temperature control relay, the resistance of which changes with temperature, minimum one for each phase. The temperature sensors shall be placed at the hottest point of LV winding. The temperature sensors must be screened and protected with metal conduit.

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The cable connection of temperature sensors must be 3-wire. The inputs of temperature control relay must be protected against electromagnetic noises and shocks. Temperature Control Relay: - Must be operable at 110 V DC supply voltage

- Must have minimum 4 PT100 temperature sensor inputs

- It must be possible to define 2 different operation threshold values to be used in

alarm and trip circuits.

- It must be possible to define 2 different operation threshold values for fan control (ON/OFF).

- Must have minimum 4 output contacts operable at 110 VDC voltage. Those contacts are: Alarm: The contact must close if the temperature exceeds a preset threshold value. Trip: The contact must close to put the transformer out of service if the temperature exceeds a second preset threshold value. Fan Control: It shall be used for switching on/off the fans if the temperature exceeds the preset threshold values. Relay Internal Failure: The contact must close in case of failure of the temperature control relay or failure of any of the sensors.

- The relay must be capable of ensuring protection in accordance with the sensor input by automatically tracing the sensor inputs and by determining the hottest sensor input.

- There must be a display (LCD or LED) on the front face of the relay showing the temperature values measured by the sensor inputs.

- It must be possible to select the desired sensor input on the relay display to see the temperature value.

- There must be LEDs on the front face of the relay to show the status of output contacts and active sensor inputs.

- A keypad, button etc. must be provided to enter the relay setting parameters and to reset the output contacts.

The warning temperatures of the Temperature Protection System for alarm and trip and the characteristics and connection diagrams of the protection system shall be submitted together with the bid. 2.3.7. Chassis and Auxiliary Equipment The transformers shall be assembled on a strong chassis capable of carrying the entire weight of the transformer; the chassis shall have flat wheels capable of moving in the direction of both axes. The wheels shall be lockable and it shall be possible to disassemble them whenever desired. The chassis, the wheels of which are disassembled, shall be suitable for sliding on flat surface. On the chassis: - Serial number shall be written with relief or engraving

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- Lifting rings shall be provided to safely lift the transformer - Towing rings shall be provided to tow in any direction in line with the axes - Screw type grounding terminal made of stainless steel shall be provided on the

bottom (marked with grounding symbol). - 2.3.8. Housing If indicated in the list of warranted characteristics, the housing to be used shall have the following characteristics: - Protection class shall be IP21 - Galvanized fabricated sheet steel compliant with TS 822 or ISO 4998 shall be

used for housing construction - The sheet thickness shall be minimum 2 mm. - The sign plate shall be provided also in this section.

2.3.9. Sign Plate There shall be a sign plate made of stainless steel or any other non-rusting metal on the transformers in a section that is easily seen. The sign plate shall be fixed with stainless steel screws or rivets and the inscriptions shall be legible, indelible and non-fading. Relays and all other devices including the cable and connection terminals shall be labeled so as to contain the information indicated in the relevant IEC, EN and TSE standards. The sign plate warning and instruction plates shall be written in Turkish or repeated in Turkish together with the original and shall be submitted to the Buyer for approval. The sign plate shall contain the following information in addition to the information indicated in IEC 60076-1. - Buyer’s order number 2.3.10. Precautions Against Corrosion 2.3.10.1 General The metal parts of the transformers shall be made of corrosion resistant material and the surfaces shall be processed so as to minimize corrosion. The following precautions shall be taken against corrosion: - Current-carrying parts shall be made of non-ferrous metal. - The material to be used in production shall be selected and arranged so as not to

cause galvanic corrosion. - Aluminum alloys, which carry current or which are used as structural members,

shall be corrosion-resistant.

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- Ferrous parts shall be hot dip galvanized. - The surfaces to be galvanized shall be smooth, undamaged, clean and free from

foreign materials reducing the life of coating. - 2.3.10.2 Galvanizing All galvanized parts other than the enclosure shall be hot dip galvanized. The tests on galvanized surfaces shall be performed in compliance with ISO 1461 standard. The galvanized fabricated sheet steels used in the housing construction shall be compliant with TS 822 or ISO 4998. 3. TESTS Unless otherwise specified, the tests shall be performed on completely assembled transformers in compliance with the relevant standards. 3.1. Tests on Fully Assembled Transformer at Factory High-accuracy devices shall be used, especially: - In the turning ratio checks, the errors shall not exceed ±0.2% - In the ambient temperature measurements the errors shall not exceed ±0.2% - In the measurement of losses and no-load current:

o Current and voltage transformers shall be class 0.2 and it shall be known that the relevant errors are within ±0.2%.

o Voltmeters and ammeters shall be class 0.2 or more accurate o For low power factor, the wattmeters shall be class 0.5 or more accurate o

All measurement systems used in the tests shall be certificated in compliance with ISO 9001 rules, must have appropriate accuracy and their periodic calibrations must be made. Measurement systems must be verified and accuracy must be ensured in compliance with IEC 60076-8. 3.2. Type Tests Dimensions of the test sample, information such as conductor type and photographs of the test shall be included in detail in the attachment of test reports of all types. a) Temperature rise (heating) test

They shall be performed in compliance with IEC 60076-11 and IEC 60076-2 at the maximum current tap of 33 kV transformers and at nominal current tap of the transformers in 6.3-15.8 kV range. If the type with housing is requested, the temperature rise test shall be performed with housing.

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b) Lightning impulse test

It shall be performed in compliance with the procedure indicated in IEC 60076-3. c) Measurement of audible sound level

It shall be performed in compliance with the procedure indicated in IEC 60076-10. d) Short circuit withstand test It shall be performed in compliance with the procedure indicated in IEC 60076-5. Unless there is a design difference, distribution transformers are grouped as follows in terms of short circuit withstand test:

Rated voltage 6,3 – 15,8 kV 33 kV

Transformer rated power

50-160 kVA 50-160 kVA

250- 630 kVA 250- 630 kVA

800 – 1600 kVA 800 – 1600 kVA

e) Measurement of harmonics of no load current The no-load current harmonics shall be measured and the magnitude of harmonics shall be expressed as % of basic component. 3.3. Special Tests The following tests shall be performed with the order given in the table and on the same transformer. a) Environment test b) Climate test - Thermal shock test c) Fire behavior test Test criteria and order for climatic, environmental and fire behavior classes:

Classes Climatic Environmental Fire behavior

Tests C1 C2 E0 E1 E2 F0 F1

Thermal shock at -50C Yes No - - - - -

Thermal shock at -250C No Yes - - - - -

Condensation test - - No Yes No - -

Condensation and humidity impact test

- - No No Yes - -

Fire behavior test - - - - - No Yes

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The above table is taken from IEC 60076-11 standard. 3.4. Routine tests The routine tests to be applied on all transformers, which are fully manufactured, in the scope of these specifications are given hereunder: a) Measurement of winding resistance It shall be performed in accordance with the procedure indicated in IEC 60076-1 and IEC 60076-2. MV winding DC resistance measurement shall be performed in all tap positions. The test currents and winding temperature at which the DC resistance measurement is performed shall be written in the test report. b) Measurement of Voltage Ratio and Check of Phase Displacement

It shall be performed in accordance with the procedure indicated in IEC 60076-1.

c) Measurement of short – circuit impedance and load loss


d) Measurement of zero-sequence impedance(s) on three-phase transformers


e) Measurement of no-load loss and current


f) Measurement of magnetizing current

g) Function tests Checks of protection and signal hardware operation shall be performed.

h) Dielectric Withstand Tests

They shall be performed in accordance with IEC 60076-3.

- Applied A.C. voltage tests - Induced A.C. voltage tests - Partial discharge measurement

i) Measurement of insulation resistance

j) Measurement of insulation capacitance loss factor

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3.5. Field Tests I. If the transformer assembly is performed by the Buyer; The field tests of transformers and other supplied equipment shall not be performed by the Contractor, however, the Contractor shall also be responsible for the failures detected during the field tests. II. If the Transformer assembly is performed by the Contractor; The following tests shall be performed in front of the representatives of the Buyer for each transformer supplied by the Contractor after the completion of assembly of installations and before their commissioning. a) Measurement of winding resistance It shall be performed in accordance with the procedure indicated in IEC 60076-1. MV winding DC resistance measurement shall be performed in all tap positions. The test currents and winding temperature, at which DC resistance measurement is performed, shall be written in the test report. b) Measurement of Insulation Resistance c) Measurement of Voltage Ratio and Check of Phase Displacement Voltage ratio shall be measured in all tap positions in compliance with the procedure indicated in IEC 60076-1. d) Measurement of Insulation capacitance loss factor e) Measurement of magnetizing current The cable connections between the cells, cabinets, boxes and terminal blocks shall be checked for the connection of Transformer Center to the central control panel. 3.6. Sampling In each delivery, the transformers which are submitted for inspection and test and which are of the same type and characteristics shall be deemed to be a batch. The samples shall be randomly selected from the batches included in the scope of delivery, by the BUYER representative/ representatives. The sample number shall be determined in accordance with the following table, unless otherwise specified.

Number of transformers in the batch Number of samples to be taken

1-5 1

6-10 2

11-30 3

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31-50 4

51-100 6

101-200 8

201 and more 10

4. MATTERS RELATED WITH TESTS AND ACCEPTANCE CRITERIA 4.1. Tests 4.1.1. Type Tests and Special Tests Provided that they are performed by a laboratory accredited by Turkish Accreditation Institution or accreditation institutions included in the International Laboratory Accreditation Collaboration Mutual Recognition Agreement in compliance with the latest editions of the relevant standards, among the tests included under article 3.1 bearing the heading “Type Tests”, the reports of the tests performed within the last 5 (five) years as of the tender date shall be accepted valid for the type tests other than “ç) Short Circuit Withstand Tests” and the reports of the tests performed within the last 10 (ten) years as of the tender date shall be accepted valid for the tests included in article 3.3 bearing the heading “Short Circuit Withstand Test” and “Special Tests”. The type test reports submitted to the directorate shall belong to the tests performed on transformers of the same type and same characteristics and produced at the same factory as the proposed dry type transformers. (short circuit withstand type test shall be assessed in accordance with article 3.2 of the Type Technical Specifications bearing the title Type Tests). The special test reports submitted to the Directorate shall belong to tests performed on transformers, in which epoxy resin of the same type and characteristics as the epoxy resin material used in the proposed dry type transformers is used. Even if the requested type test and special test reports were submitted to the Directorate and found appropriate by the Directorate, the type and special tests requested by the Directorate shall be performed without requiring the Directorate to pay any expenses, provided that the Directorate indicated the type and special tests that it wants to be repeated in the tender file. The type tests, which are not submitted to the Directorate, or which are submitted but do not comply with the above conditions, shall be performed by an accredited laboratory under the supervision of the Directorate representatives or the representative of the accredited laboratory in compliance with the current and latest editions of the relevant standards, and their charge shall be borne by the Contractor. The type and special tests, which are not submitted to the Directorate, or which are submitted but do not comply with the above conditions, shall be performed before the acceptance tests. In relation with the type test and special test submitted to the Directorate, a table containing information on the type and characteristics of the transformers that are type tested and subjected to special tests, the laboratory performing the tests and the date of such tests, and furthermore, the documents evidencing that the laboratory,

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which performed the tests, is an accredited laboratory, shall be submitted together with the necessary explanations in Turkish. 4.1.2. Routine Tests The routine tests included in article 3.4 of the Type Technical Specifications shall be applied by the Manufacturer on each transformer submitted for acceptance. 4.1.3. Acceptance Tests The routine tests included in article 3.4 of the Type Technical Specifications shall be applied on samples to be selected in accordance with article 3.6 sampling for each dry type transformer delivery in accordance with the current and latest editions of the relevant standards and test reports shall be submitted to the Directorate in minimum 3 (three) copies in CD/DVD medium or in the form of printouts. The acceptance tests shall be performed at the Manufacturer’s laboratory or a laboratory approved by the Directorate and expenses shall be borne by the Contractor. The documents of routine tests shall be submitted to the Inspection and Acceptance Commission before commencing the acceptance tests. Otherwise, the test and acceptance transactions shall not be commenced. 4.2. Acceptance Criteria a) The calibrations of the devices to be used in the tests shall be performed by an accredited organization and calibration certificates shall be submitted to the Inspection and Acceptance Commission before starting the tests. b) Positive results shall be obtained from all type tests and special tests to be performed. In case a type test or special test results negatively, all transformers in the order shall be rejected. However, upon the request of the Contractor and approval of the Directorate, re-performance of the tests on a new product, on which design change is made can be accepted in the sole discretion of the Directorate without any period extension, provided that their charges will be borne by the Contractor and they are performed within a reasonable period. In case the tests that are performed for the second time result negatively, the entire order shall be rejected. c) Positive results shall be obtained from all acceptance tests. In case a negative result is obtained in any of the tests, those tests shall be performed on all transformers in the batch. The transformers, for which negative results are obtained in the tests shall be either replaced or repaired and the relevant expenses shall be borne by the Contractor. 4.3. Acceptance Procedure The inspections and tests can be performed at the Manufacturer’s plants, at the material delivery place and/ or at- the final delivery location of the materials. If the inspections and tests are performed at the manufacturer’s plants, any kind of

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reasonable aid and facilitation shall be provided for the inspection commission including the permission to review the drawings and production information without requiring the Directorate to pay any expenses. All inspection and test expenses shall be borne by the Contractor. The Contractor shall send a detailed test program to the Directorate after signing the contract. The Contractor shall notify the main starting date of the tests to the Directorate minimum 30 (thirty) days before for the tests to be performed abroad and minimum 15 (fifteen) days before for the tests to be performed in the country. As the result of the successful tests and inspections, the test reports shall be mutually signed and Shipment Order shall be given by the Directorate’s representatives. The Contractor shall submit minimum 3 (three) copies of mutually signed test report to the representatives of the Directorate. However, the Directorate may inform the Contractor in time that it will not be present at the tests. If the Directorate does not notify the Contractor of its participation to the tests 48 hours beforehand, the Contractor shall perform the tests and notify their results to the Directorate. The test reports prepared and signed by the Contractor shall be sent to the Directorate in 3 (three) copies for inspection and approval. If the test reports are approved, the Directorate shall place a Shipment Order for delivery and 1 (one) copy of approved test report shall be sent back to the Contractor.

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ANNEX –I/A LIST OF WARRANTED CHARACTERISTICS FOR DRY TYPE AUXILIARY

SERVICE POWER TRANSFORMERS WITH EPOXY RESIN COATED WINDINGS (MV/LV) (33/0.4

kV, 160 KVA)

DEFINITION UNIT REQUESTED WARRANTED

1. Manufacturer Name -

2. Type mark of the manufacturer -

3. Applied standards -

4. Type - Indoor

5. Rated frequency (Hz) 50

6. Rated power (kVA) 160

7. Connection Group -

8. Cooling type -

9. Operational Conditions

Height from sea level (m)

Ambient temperature

- Maximum (0C) +40

- Minimum (0C) -25

- 24-hour average (0C) +30

- One-year average (0C) Below +250C

Ambient air pollution - Small

Maximum relative humidity (%) 93

Exposure to earthquake

- Horizontal acceleration (g) 0.5

- Vertical acceleration (g) 0.25

Environment Class - E2

Climate class - C2

Fire class - F1

10. Insulation Material Temperature Class

LV winding - (F) or (H)

MV winding - (F) or (H)

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11. Temperature Rise Limits

Maximum winding temperature rise (K)

Insulation system (hot spot) temperature

(K)

12. Overload Protection Temperature

Alarm (0C)

Trip (0C)

13. Reference Temperature (T ref) (0C)

14. Rated Voltages

MV winding (kV) 33

LV winding (kV) 0,4

15. No load voltage setting - MV and no load

16. Voltage setting area and tap number

- 30-31,5-33-34,5-36

17 No load change ratio -

18. Insulation Levels

Short period power frequency withstand voltage for MV windings

(kV-effective)

70

Short period power frequency withstand voltage for LV windings

(kV-effective)

3

Lightning impulse withstand voltage for MV windings (1.2-50 microseconds)

(kV-peak)

170

19. Partial Discharge level (Maximum) (pC) <10

20. Short Circuit Impedance (minimum) (%Uk) 6

21. No load current (%)

22. No Load losses (Watt) 460

23. Load losses (at reference temperature) (in the main tap)

(Watt) 2860

24. Sound power level (dB) ≤56

25. Short circuit withstand period (thermal)

(s) 2

26. LV Winding

Conductor material (aluminum / copper)

-

Conductor cross section (mm2)

Total conductor weight (kg)

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Winding insulation -

Conductor type (folio/ tape) -

Winding shape Concentric circular Concentric non-circular

-

27. MV Winding

Conductor material (aluminum/ copper)

-


Total conductor weight (kg) (kg)


Conductor type (round/ tape) -


-

28. Maximum variation in short circuit reactance after short circuit withstand test (shall be completed by the manufacturer in accordance with IEC60076-5).

(%)

29. Core Characteristics

Material - Cold extruded Si-

Sac

Magnetic flux density

- At rated voltage (Tesla) <1.75

- At 110% of rated voltage (Tesla)

Core weight (kg)

30. External Connection Type

LV terminals -

MV terminals -

31 Housing (YES/ NO)

32. Terminals

Material

Dimensions (mm)

33. Weights

Total weight of the transformer (kg)

Carrying weight (kg)

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DEFINITION UNIT REQUESTED

WARRANTED

34.

External dimensions

Width (mm)

Length (mm)

Height (mm)

35.

Wheels

Dimensions (diameter and width) (mm)

Distance between wheels (mm)

36.

Epoxy resin insulation material Physical and Mechanical Characteristics

Manufacturer and commercial code of epoxy resin

-

Epoxy resin insulation material mix (commercial name of the material and its amount in the mixture shall be given in weight)

-

Resin -

Filling -

Hardener -

Catalyzer -

Dielectric loss factor (tan ) -

200C -

800C

1000C

- Dielectric constant (r) (200C) -

Specific resistance

200C (ohm-cm)

800C (ohm-cm)

- Glass transition temperature (Tg) (0C)

- Water absorption ratio (%)

- Tensile force (N/mm2)

- Elongation in case of breaking (%)

- Static E-Modulus (N/mm2)

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ANNEX –I/B

LIST OF WARRANTED CHARACTERISTICS FOR DRY TYPE AUXILIARY SERVICE POWER

TRANSFORMERS WITH EPOXY RESIN COATED WINDINGS (MV/LV) (33/0.4 kV, 250 KVA)





4. Type - Indoor




8. Cooling type -



Ambient temperature

- Maximum (0C) +40

- Minimum (0C) -25









Climate class - C2

Fire class - F1




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(K)


Alarm (0C)

Trip (0C)


14. Rated Voltages

MV winding (kV) 33

LV winding (kV) 0,4



- 30-31,5-33-34,5-36




(kV-effective)

70


(kV-effective)

3


(kV-peak)

170






(Watt) 3740



(s) 2

26. LV Winding


-



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-

27. MV Winding


-






-


(%)



Sac




Core weight (kg)


LV terminals -

MV terminals -


32. Terminals

Material

Dimensions (mm)

33. Weights



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DEFINITION UNIT REQUESTED

WARRANTED

34.

External dimensions

Width (mm)

Length (mm)

Height (mm)

35.

Wheels



36.



-


-

Resin -

Filling -

Hardener -

Catalyzer -


200C -

800C

1000C


Specific resistance

200C (ohm-cm)

800C (ohm-cm)






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ANNEX –I/C

LIST OF WARRANTED CHARACTERISTICS FOR DRY TYPE AUXILIARY SERVICE POWER TRANSFORMERS WITH EPOXY RESIN COATED

WINDINGS (MV/LV) (33/0.4 kV, 400 KVA)





4. Type - Indoor




8. Cooling type -



Ambient temperature

- Maximum (0C) +40

- Minimum (0C) -25









Climate class - C2

Fire class - F1




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(K)


Alarm (0C)

Trip (0C)


14. Rated Voltages

MV winding (kV) 33

LV winding (kV) 0,4



- 30-31,5-33-34,5-36




(kV-effective)

70


(kV-effective)

3


(kV-peak)

170






(Watt) 4950



(s) 2

26. LV Winding


-



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-

27. MV Winding


-






-


%



Sac




Core weight (kg)


LV terminals -

MV terminals -


32. Terminals

Material

Dimensions (mm)

33. Weights



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34.

External dimensions

Width (mm)

Length (mm)

Height (mm)

35.

Wheels



36.



-


-

Resin -

Filling -

Hardener -

Catalyzer -


200C -

800C

1000C


Specific resistance

200C (ohm-cm)

800C (ohm-cm)






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ANNEX –I/D

LIST OF WARRANTED CHARACTERISTICS FOR DRY TYPE AUXILIARY SERVICE POWER

TRANSFORMERS WITH EPOXY RESIN COATED WINDINGS (MV/LV) (33/0.4 kV, 500 KVA)





4. Type - Indoor




8. Cooling type -



Ambient temperature

- Maximum (0C) +40

- Minimum (0C) -25









Climate class - C2

Fire class - F1




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(K)


Alarm (0C)

Trip (0C)


14. Rated Voltages

MV winding (kV) 33

LV winding (kV) 0,4



- 30-31,5-33-34,5-36




(kV-effective)

70


(kV-effective)

3


(kV-peak)

170






(Watt) 6200



(s) 2

26. LV Winding


-



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-

27. MV Winding


-






-


%



Sac




Core weight (kg)


LV terminals -

MV terminals -


32. Terminals

Material

Dimensions (mm)

33. Weights



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34.

External dimensions

Width (mm)

Length (mm)

Height (mm)

35.

Wheels



36.



-


-

Resin -

Filling -

Hardener -

Catalyzer -


200C -

800C

1000C


Specific resistance

200C (ohm-cm)

800C (ohm-cm)






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ANNEX-II

DRY TYPE AUXILIARY SERVICE POWER TRANSFORMERS WITH EPOXY RESIN COATED WINDINGS (MV/LV) LIST OF DEVIATIONS

Order No : ……………………… Drawing No : ……………………… Material Code No of Buyer: ……………………… A- DEVIATIONS FROM TECHNICAL SPECIFICATIONS

(The articles, from which there are deviations, and what those deviations are shall be clearly indicated by the bidder).

- ………………………………………….

- ………………………………………….

- ………………………………………….

- ………………………………………….

- ………………………………………….

- ………………………………………….

- ………………………………………….

B- DEVIATIONS IN THE LIST OF WARRANTED CHARACTERISTICS

(The articles, from which there are deviations, and what those deviations are shall be clearly indicated by the bidder).

- …………………………………………

- …………………………………………

- …………………………………………

- …………………………………………

- …………………………………………

- …………………………………………

- …………………………………………

Documents

TECHNICAL SPECIFICATIONS FOR DRY TYPE AUXILIARY …