Kontaktledning/Autotransformatorer

1 Purpose

This standard (in Trafikverket caled "kravdokument") or technical specification (in Bane NOR), which is an Swedish version of Krav:03:1861, has been drawn up in order to standardize the manufacturing of 3, 5 and 6 MVA autotransformers. This spesification replaces the original document: Power systems. Autotransformers with rated output of 3,5 and 6 MVA issued from Trafikverket.

The document is a joint publication by Trafikverket (the Swedish Transport Administration) and Bane NOR (the Norwegian National Rail Administration).

Proposals for alteration regarding this specification shall be put to Høyspenning, Elkraft, Teknisk, Drift og teknologi, Bane NOR.

1.1 Prerequisite texts

Spesifications may, in addition to requirements, also contain descriptions of conditions written in italics. These so-called prerequisite texts state conditions that the person who is to meet the requirements in the relevant document or section has the right to count on. The texts can, for example, refer to starting points for the work, boundaries or interfaces. The purpose of the prerequisite texts is to describe the whole where the required function or solution forms a part.

The precondition text itself thus does not express any request that something be fulfilled or provided. Note, however, that the relationship expressed as a conditional text in italics may be required elsewhere in the regulations.

2 Scope

In this specification, Trafikverket and Bane NOR make their demands on design of autotransformers with a rated output of 3, 5 and 6 MVA regarding electrical and mechanical performance and surface treatment. Requirements for testing and documentation are also stated.

The document does not comprise design of, and requirements, for the concrete foundation including the superstructure, in which the autotransformer will be installed.

The document shall be applied in connection with Trafikverket public procurements.

The document is intended for clients, tenderers, suppliers, designers, contractors, and inspectors.

Trafikverket and Bane NOR is called the purchaser in this document.

3 Terms and definitions

Operating side The side of a transformer that is the easiest accessible when the transformer has been installed in its superstructure.

AT system Power system with autotransformers.

Total Harmonic Distortion The total harmonic distortion (THD) is a measurement of the harmonic distortion present in a signal and is defined as the ratio of the sum of the powers of all harmonic components to the power of the fundamental frequency.

For voltage:

[math] \mathrm{THD_U} \,= 100 \, \sqrt { \sum_{n=2}^\infty \left (\frac{ V_n}{V_1} \right )^2} \% [/math]

For current:

[math] \mathrm{THD_I} \,= 100 \, \sqrt { \sum_{n=2}^\infty \left (\frac{ I_n}{I_1} \right )^2} \% [/math]

Prerequisite: Additional definitions and terms used in the document found in EN 50163:2004 Railway applications — Supply voltages of traction systems

and

IEC 60050 Issue 1: 2014: Amendment 1 — Amendment 1 — International Electrotechnical Vocabulary — Part 161: Electromagnetic compatibility; Part 732: Computer network technology; Part 851: Electric welding

4 Abbreviations

AT
Autotransformer.

AT system
Power supply system with autotransformers.

BT
Booster transformer.

BT system
Power supply system with booster transformers.

FAT
Factory Acceptance Test.

f_r
Rated frequency.

I_k″
Subtranscent short-circuit current associated with faults between the contact line and the rail or between the supply line and the rail.

I_p
Maximum short-circuit current peak value associated with fault between contact line and rail or between supply line and rail.

I_RMS
RMS current.

I_THD
The total harmonic distortion of the current.

LI
Rated lightning impulse withstand voltage level, rated voltage at impulse voltage.

L_pa
A-weighted Sound pressure level.

LWA
- A-weighted Sound power level.

MTTF
Mean Time To Failure.

NBR
Nitrile Butadiene Rubber.

ONAN
Oil Natural Air Natural.

PD
Partial Discharge.

PE
Protective Earth.

PRD
Pressure relief valve.

S_r
Nominal power.

U_m
Highest voltage for equipment.

U_max1
Maximum overvoltage.

U_n
Nominal voltage.

z_k
short circuit impedance.

5 Function and use

Autotransformers are used at present for transferring power in the Trafikverket and Bane NOR AT systems and will also be used in prospective AT-BT systems.

The supply voltage to an autotransformer shall be connectible in two ways: between outlet A and B at system voltage 30 kV, and between terminals A and 0 at system voltage 15 kV. Figur 1 shows a simplified diagram of an autotransformer and the most important parameters.

Figur 1: Simplified diagram of an autotransformer and the most important parameters

A = Terminal A (connected to the catenary wire or the positive wire in Norwegian systems)

0 = Terminal 0 (connected to S-rail [continuous rail]/grounding line)

B = Terminal B (connected to the feeder wire or the negative wire in Norwegian systems)

N₁ = Number of turns in primary winding

N₂ = Number of turns in secondary winding (here N₁ = 2 × N₂)

U₁ = Voltage across the primary winding

U₂ = Voltage across the secondary winding

I₁ = Current in the primary winding

I₂ = Current in the transformer’s centre terminal

Z_T = Transformer’s inner reactance

The load is connected between terminals A and 0. With the turn ratio at N₁/N₂ = 2/1, the current between the two transformer terminals A and B (I₁) is always the same, while the current through terminal 0 is double the winding current (I₂ = 2 × I₁).

The spacing between the transformers is approximately 10 km and the distance between feeding stations is approximately 120 km. The transformers are not to be equipped with dedicated circuit breakers. An outgoing line power breaker in each feeding station connects and disconnects a number of in-parallel transformers along a line section.

Figur 2 and Figur 3 show the simplified principles of the AT systems of Trafikverket and Bane NOR.

Figur 2: Simplified sketch of Trafikverket AT system

Figur 3: Simplified sketch of Bane NOR AT system

One difference between the Trafikverket and the Bane NOR AT systems (design E) is that the catenary system is sectionalized. Each contact wire section is connected to a through-going positive wire as shown in Figur 3.

6 Technical information

6.1 General requirements

The transformer shall be designed according to: EN 60076-1:2011 Power transformers — Part 1: General.(K677377)

Transformer must meet requirements according to:

• EN 50163:2004 Railway applications — Supply voltages of traction systems.
• 50329:2004 Railway applications — Fixed installations — Traction transformers.

Transformer shall meet requirements according to: TDOK 2014:0774: BVS 543.19300 Kraftförsörjningsanläggningar — Elektriska krav på fordon med avseende på kompatibilitet med infrastrukturen och andra fordon. (K677379)

The active part of the transformer, i.e. core and windings, shall be identical for 5 and 6 MVA, respectively. (K677380)

3, 5 and 6 MVA autotransformers shall be delivered with or without measuring transformers. (K677381)

6.2 Dimentioning data

Tabell 1 shows dimensioning data for autotransformers with rated outputs of 3 and 5 MVA.

Tabell 1: Dimensioning data for autotransformers with rated outputs of 3, 5 and 6 MVA

Parameter/claim	Values			Requirement number
Rated output (through-going output/dimensional out-put [MVA])	3.0/1.5	5.0/2.5	6.0/3.0	K677383
Stated power	Rated power shall be stated in the tender.			K677384
Nominal voltage (Un1/Un2) [kV]	33/16.5	33/16.5	33/16.5	K677389
Transformer nominal voltage Un	Nominal voltage shall be 15 kV according to EN 50163:2004 Railway applications - Supply voltages of traction systems			K677388
Transformer operating voltage	The operating voltage of the transformer shall be 16.5 kV.			K677390
Voltage variations	The transformer shall be designed to withstand voltage variations according to EN 50163:2004 Railway applications - Supply voltages of traction systems samt TDOK 2014:0774: BVS 543.19300 Kraftförsörjningsanläggningar – Elektriska krav på fordon med avseende på kompatibilitet med infrastrukturen och andra fordon med Ucrest < 35 kV.			K677391
Design voltage Um	Design voltage on both the input and output side shall be selected to 36 kV according to table 1 in EN 61936-1 Power installations exceeding 1 kV a.c. — Part 1: Common rules			K677395
Rated current (In1/In2) [A]	90.9/181.8	151.5/303	181.8/363.6	K677386
Rated frequency [Hz]	16.7			K677399
Short-circuit impedance (ZT) [[math] \Omega [/math]] or [%] Derivation and feed in accordance with section Routine tests	= 0.218 (+0/-10 %) for 5 MVA or 0.4 % (+0/-10 %) in general for other ratings at the 16,5 kV side. Deviation from abowe reguerment shall be in accordance with the chapter short-circuit test.			K677401/K677402
Turn ratio (N1/N2)	2/1			K677393
Insulation level	LI 170, AC 70			K677397
Housing class	IP 55			K677645
Coolant type	ONAN EN 60076-2:2011 Power transformers — Part 2: Temperature rise for liquid-immersed transformers			K677412
Coolant media	Cooling media shall be inhibited transformer oil according to Krav: 03: 745: Insulating vätskor for electric power equipment.			K677410 Trafikverket only
Noise level	The maximum noise level shall be determined as the total noise level for the system according to the guideline TDOK 2017: 0686: TDOK 2017:0686: Riktlinje Buller och Vibrationer vid planering av bebyggelse.			K677419 Trafikverket only
Maximum noise level	The maximum sound output from individual transformers is 65 dB(A).			K677420
Noise verification	Checking the sound level shall be performed according to IEC 60076-10:2016 Power transformers — Part 10: Determination of sound levels.			K677421
Functional safety (MTTF)	To be stipulated in the tender			–
Aging factor (V)	Shall be < 1 with the stated load cycle IEC 60076-7:2018 Power transformers — Part 7: Loading guide for mineral-oil-immersed power transformers			K677404
Idling and full-load losses	To be stated as a function of the through-going output. Assessment of idling and full-load losses is to be carried out by the customer.			–

7 Performance requirements

Prerequisite: The transformer is the main appliance in the AT and AT-BT systems, and there are high expectations regarding its reliability and proper dimensioning. One of the important factors that shall be considered in association with the dimensioning of the transformer is the connection and fault frequency in the catenary system.

The occurrence of short-circuit currents, together with the catenary system’s susceptibility to short-circuit, also places a high demand on the transformer’s mechanical dimensioning.(K677408)

Generaly it can be assumed approximately 0,3 short-circuit events per km and year (0,3 faults/km·year). The short-circuit current through true the autotransformers is depended about the fault location and fault impedance. The current will be at it's maximum close to the autotransformer, smalest if the fault is inbetween to units and there is high fault impedance.

Tabell 2 shows the most important environmental factors that have to be considered in the dimensioning of the transformer and a number of references to relevant standards.

Tabell 2: Parameters and values for environmental factors

Parameter	Value	Requirement number (Se)
Operational voltage (Ud)	16.5 kV	K677390
Voltage variations	In accordance with EN 50163 with Ucrest < 35 kV
Harmonics voltage	The transformer shall be designed for withstand harmonic distortion in the network. Typical voltage harmonic is UTHD = 40 %	K677430
Total harmonic distortion	Typical distribution of the dominant voltage harmonics (UTHD = 40 %): n % (harmonics no.) (relative to fundamental tone of voltage) 3 35 5 20 7 4	K677431
Harmonics current	ITHD up to 60 % (at the rated current of the transformer)	K677433
Total harmonic distortion in the load current	Distribution of the current harmonics (ITHD = 60 %): N % (harmonics no.) (relative to rated current of locomotive) 3 5 5 3 7 3 9 3	K677434
Frequency	16,7 Hz (± 1/3 Hz)	—
Coupling type	Ia0	K677425
Cooling Methods	Cooling type shall be ONAN according to EN 60076-2:2011 Power transformers — Part 2: Temperature rise for liquid-immersed transformers	K677412
Ambient and operating temperatures, south of Dalälven river	-40 to +40 ºC	K677415
Ambient and operating temperatures, north of Dalälven river	-50 to +40 ºC	K677414
Temperatur for apparatus placed on transformer tank, Sweden	-50 °C to +105 °C.	K677417
Ambient and operating temperatures, Norway	-40 to +40 ºC	K677416
Loadability	The transformer shall be designed to withstand overload according to IEC 60076-7:2018 Power transformers — Part 7: Loading guide for mineral-oil-immersed power transformers.	K677427
Load cycle (repeated every hour, load as % of rated output)	100 % for 39 minutes followed by 150 % for 15 minutes followed by 200 % for 5 minutes followed by 300 % for 1 minute	K677428
Sub-transient short-circuit currents (I″k) associated with faults between the catenary and the rails or between the feeder wire and the rails	Short-circuit current through the centre terminal: 12 kA at 16.5 kV Short-circuit current in each winding: 6 kA Disconnection time associated with short-circuit: < 0.6 seconds Other requirements can apply, see section Short-circuit withstand capability.	K677476
Maximum surge current (Ip) associated with a fault between the catenary and the rails or between the feeder wire and the rails	2.55 × Ik’’ = 30.6 kA Other requirements can apply, see section Short-circuit withstand capability.	K677477
Number of on operations	Four switches on/off per 24 hours.	K677478
Fault frequency in the catenary system	Up to 1 fault per km and year.	K677479 Trafikverket only
Enclosure	Complete transformer shall be made in at least enclosure class IP55 in accordance with UNE EN 60529:2018 Degrees of protection provided by enclosures (IP Code)	K677423

8 Design

8.1 General requirement

Transformer welding shall be performed by licensed welders.(K677437)

The transformer shall be equipped with drawbar eyes for positioning when it is standing on oak beams.(K677438)

The transformer’s active components (core and windings) shall have the same dimensioning for both 3, 5 and 6 MVA.(K677439)

Transformer accessories shall be designed in accordance with EN 50216-4:2015 Power transformer and reactor fittings — Part 4: Basic accessories (earthing terminal, drain and filling devices, thermometer pocket, wheel assembly)(K677440)

Stainless steel shall be of the lowest quality EN 1.4401 (A4).(K677441) (Trafikverket only)

The transformer's nameplate shall be supplemented with the following information:(K677442)

1. Type of insulating liquid.
2. Volume of expansion vessel.
3. If expansion vessels have a plastic or rubber bag.
4. That vessels are vacuum safe.

The height of the transformer excluding bushings, expansion vessels and oil coolers shall not exceed 2840 mm.(K677443)

The maximum external dimensions of the transformer (including bushings, expansion vessels and oil coolers) shall not exceed:(K677444)

• Width 1300 mm
• Depth 2300 mm
• Height 3800 mm.

8.1.1 Transformer tank

The lower part of the transformer tank shall be made with two diagonally placed protective earth outlets according to EN 50216-4:2015 Power transformer and reactor fittings — Part 4: Basic accessories (earthing terminal, drain and filling devices, thermometer pocket, wheel assembly).(K677446)

The ground line must be a copper conductor with few threads.(K677447)

Earth connections shall be clearly marked.(K677448)

Transformer tank shall be pressure and vacuum safe according to EN 60076-1:2011 Power transformers — Part 1: General.(K677449)

The transformer tank shall be painted inside.(K677450)

Transformer shall be equipped with a sampling valve for oil samples located at:(K677451)

• Tank cover.
• Half the tank height.
• Tank bottom.

Volume in pipes for sampling valve shall be stated in the transformer maintenance instructions.(K677452)

Valve for filling/draining oil and sampling valve shall be located as far down on the tank as possible.(K677454)

All ball valves shall be easily accessible.(K677455)

The transformer tank shall be marked with a center of gravity for transport.(K677456)

The transformer tank shall be equipped with brackets for two separate holders for shock gauges.(K677457)

Holders for shock gauges shall have four welded M6 nuts according to dimensional information obtained during the design review.(K677458)

Outlets for lifting jacks shall be located at the bottom of the tank, at least 300 mm above the foundation.(K677459)

Outlets for lifting jacks at the bottom of the tank shall be integrated in the transformer tank.(K677460)

The transformer shall be equipped with lifting loops for handling of the transformer filled with oil.(K677461)

I shall be a permanent and fixed mounted ladder for access to tank cover.(K677462)

The ladder shall be covered with a door with padlock.(K677463)

Ladder to transformer top shall:(K677464)

1. Not be higher than the tank cover.
2. Have nonslip rungs.
3. Be equipped with fall protection according to AFS 2009:2 Arbetsmiljöverkets författningssamling — Arbetsplatsens utformning.

8.1.2 Transformer tank cover

Transformer tank cover shall be welded to transformer tank.(K677466)

Transformer tank cover shall be equipped with air nipples at the highest points to avoid air entrapment.(K677467)

There shall be a termination for the transformer core (earth potential) on the tank cover.(K677468)

Transformer tank cover shall be equipped with protective earth outlet on both short sides according to EN 50216-4:2015 Power transformer and reactor fittings — Part 4: Basic accessories (earthing terminal, drain and filling devices, thermometer pocket, wheel assembly) (K677469)

Bracket for fall prevention equipment shall be located in the middle of the transformer tank cover.(K677471)

Bracket for fall equipment shall be designed according to guidelines in AFS 2009: 2 AFS 2009:2 Arbetsmiljöverkets författningssamling - Arbetsplatsens utformning.(K677472)

8.1.3 Short-circuit withstand capability

The transformer shall be designed to handle 50 short circuits of 12 kA through the center of the autotransformer (6 kA per winding) during its lifespan.(K677474)

Other requirements for short circuit current can apply, especially if the short circuit current in the network is high. Refer to Bane NOR technical regulations requirement number TRV:00321, TRV:00322, TRV:00323, and TRV:00324 in Generelle tekniske krav – 4.(Bane NOR only)

8.1.4 Cooling Equipment

Removable radiator shall be designed according to EN 50216-6:2002 Power transformers and reactor fittings Cooling equipment. Removable radiators for oil-immersed transformers (K677481)

Removable radiator shall be hot-dip galvanized.(K677482)

Hot-dip galvanized radiator shall not be painted.(K677483)

The radiator shall be equipped with a shut-off valve on the inlet and outlet so that drainage of the radiator is permitted.(K677484)

Shut-off valve shall be a butterfly valve.(K677485)

Butterfly valve shall be of type B or C according to EN 50216-8:2005 Power transformer and reactor fittings Butterfly valves for insulating liquid circuits (K677485)

The radiator shall be equipped with a drain valve.(K677487)

8.1.5 Surface treatment

Transformer tank, tank cover, expansion vessel and contact protection shall be painted in color RAL 7035 for transformers belonging to the Swedish Transport Administration. (Same color to be used for Bane NOR)(K677492)

Painted rust protection shall be made in accordance with ISO 12944-5:2019 Paints and varnishes — Corrosion protection of steel structures by protective paint systems — Part 5: Protective paint systems (ISO 12944-5:2007).(K677493)

Applied environmental class/corrosivity class shall be at least C4 according to ISO 12944-2:2017 Paints and varnishes — Corrosion protection of steel structures by protective paint systems — Part 2: Classification of environments.(K677494)

Applied environmental class/corrosivity class shall be C5-MH according to ISO 12944-2:2017 Paints and varnishes — Corrosion protection of steel structures by protective paint systems — Part 2: Classification of environments if any of the following conditions apply:(K677495)

• Coastal area with a large amount of salt in the air, similar to Västkusten. (Trafikverket only)
• Coastal area with a large amount of salt in the air, which means all coastal area of Norway. (BaneNor only)
• Area with aggressive atmosphere, such as ambient air with the presence of sulfur or equivalent.

Applied durability class shall be H (expected durability high) according to ISO 12944-1:2017 Paints and varnishes — Corrosion protection of steel structures by protective paint systems — Part 1: General introduction(K677496)

Hot-dip galvanizing shall be carried out in Fe/Zn 115, table NA.1 according to ISO 1461:2009 Hot dip galvanized coatings on fabricated iron and steel articles — Specifications and test methods.(K677497)

8.1.6 Insulating liquid

Insulating fluid shall meet the requirements according to Krav:03:745: Isolervästskor för elkraftsutrustning.(K677499)(Trafikverket only)

Insulating liquid shall be inhibited mineral oil.(K677500)

Insulating oil shall be of type "NYTRO 10XN" or equivalent.(Bane NOR only)

The oil which the autotransformer is filled with at the test field, shall also be the same oil the transformer are filled with at site.(Bane NOR only)

Insulating oil shall not be corrosive according to CCD-CIGRÈ method.(Bane NOR only)

Insulating oil shall be guaranteed free from PCB's (less than 2 ppm) and silicon.(Bane NOR only)

The warranty period for oil leakage shall be established at the time the contract is signed. The warranty period shall be at least 10 years.(Bane NOR only)

The oil-containing component shall be hermetically sealed.(Bane NOR only)

8.1.7 Sealing system

Seal shall be of the groove type with a round, square or rectangular profile.(K677502)

The degree of filling in grooves for sealing shall not exceed 75%.(K677503)

Seal shall be oil and age resistant.(K677504)

Sealing shallbe carried out for a working temperature from -40 °C to +120 °C.(K677505)

Seal shall be tight for pressures from 0.2 mbar to 2 bar.(K677506)

The seal shall be made of synthetic rubber, NBR or Viton.(K677507)

Cork gaskets shall not be used.(K677508)

The following shall be delivered with the delivery documentation:(K677509)

• Material specification of the sealing system.
• Assembly drawing with placement of different O-rings on the transformer.
• Assembly drawing of the different O-ring dimensions.

8.1.8 Expansion vessel

For hermetically sealed oil circuits, expansion vessels shall be made with one of the following alternatives.(K677511)

1. Rubber bag
2. Alternative solution in consultation with the customer.

The expansion vessel shall be equipped with valves for filling air in the air bag.(K677512)

Leakage of air into the transformer shall not exceed 0.3% of the volume in the air bag.(K677513)

The inside of the expansion vessel shall be painted.(K677514)

Oil filling with shut-off valve shall be located at:(K677515)

• Expansion vessel
• In ground plan.

The step brackets shall be mounted on expansion vessels close to the oil level indicator.(K677516)

Valve for expansion vessel shall be accessible from tank cover.(K677517)

Expansion vessels shall be equipped with a dryer apparatus.(K677518)

Oil locks for dryer apparatus shall not be mounted higher than 1.5 m above the ground.(K677519)

The dryer apparatus shall be located on the maintenance side of the autotransformer.(K677520)

The dryer apparatus shall be made of stainless steel.(K677521)

Pipes between expansion vessels and dryer apparatus shall be made of stainless steel.(K677522)

Dryer apparatus shall not be painted.(K677523)

Stainless steel surfaces shall not be painted.(K677524)

Desiccant shall be visible throughout the dryer apparatus.(K677525)

The desiccant volume of the dryer apparatus shall correspond to at least a 3-year maintenance interval.(K677526)

The dryer apparatus shall be marked with a color symbol that shows the color of the damp desiccant.(K677527)

Marking shall be oil and weather resistant.(K677528)

Self-drying dryer apparatus shall not be used unless there is an approval from the exhibitor of this document.(K677529)

8.1.9 Bushings

Bushings shall be carried out in accordance with EN 50180-1:2015 Bushings above 1 kV up to 52 kV and from 250 A to 3,15 kA for liquid filled transformers — Part 1: General requirements for bushings.(K677531)

Bushings shall be of plug-in type C.(K677532)

Bushings shall have a rated current of 630A.(K677533)

Bushings shall be located on the transformer cover according to figure Figur 4.(K677534) Ny figur i siste revisjon!!

The transformer cover shall be equipped with a bushing for earthing of the transformer core.(K677535)
Prerequisite: Grounding of the core is performed outside via the bushing.

Figur 4: Location of bushings on the transformer cover (measured in mm)

8.1.10 Surge arresters

Surge arresters shall be made in accordance with EN 60099-4:2014 Surge arresters — Part 4: Metal-oxide surge arresters without gaps for a.c. systems.(K677538)

Surge arresters shall be adapted to be connected to bushing type C, 630 A according to EN 50180-1:2015 Bushings above 1 kV up to 52 kV and from 250 A to 3,15 kA for liquid filled transformers — Part 1: General requirements for bushings.(K677539)

Surge arresters shall be connected to bushings A and B respectively according to figure 4.(K677540)

Surge arresters shall be mounted parallel to the cable termination on each bushing.(K677541)

Surge arresters shall be dimensioned to cope with any overvoltages specified in Environmental factors and the transformer's insulation level.(K677542)

8.1.11 Instrument transformers

The autotransformer shall be designed in such a way that instrument transformers can be mounted afterwards.(K677544)

Instrument transformers are not standard and shall be installed only for special needs.(Bane NOR only)

8.1.11.1 Current transformer

As an option, for the standard design of the transformer, it shall be possible to mount a current transformer between the 0 bushings, see figure 4.(K677546)

Current transformer shall be designed according to IEC 61869-2:2012 Instrument transformers — Part 2: Additional requirements for current transformers.(K677547)

It shall be possible to replace the current transformer from the tank cover by loosening the rail that connects the 0-bushings.(K677548)

Current transformer's secondary side shall be connected to the transformer's control cabinet.(K677549)

Current transformer shall be designed to meet the following requirements:(K677550)

• Primary current 600 A
• Secondary current 1 A
• Frequency 16.7 Hz
• Rated power 0.1- 15 VA
• Class 0.5 FS ≤ 5 for measurement.

8.1.11.2 Voltage transformer

As an option, for the standard design of the transformer, a voltage transformer shall be mounted to the 0 bushings.(K677552)

Voltage transformer shall be designed according to IEC 61869-3:2011 Instrument transformers — Part 3: Additional requirements for inductive voltage transformers(K677553)

The primary side of the voltage transformer shall be equipped with a replaceable fuse that is located in the transformer tank.(K677554)

The secondary side of the voltage transformer shall be connected to the transformer's control cabinet via fuses.(K677555)

Voltage transformer shall be designed to meet the following:(K677556)

1. Primary voltage 17000 V
2. Secondary voltage 110 V
3. Frequency 16.7 Hz
4. Rated power 1- 20 VA
5. Class 1.0 for measurement.

8.1.12 Wiring on transformer

Wired cables shall not affect water drainage.(K677558)

Cables shall withstand temperatures of at least 100 ̊C.(K677559)

Cables for control and measurement shall have a conductor area of ​​at least 1.5 mm².(K677560)

Conductor area for current measuring circuit shall be at least 2.5 mm².(K677561)

Cables shall be:(K677562)

1. Armored
2. Halogen free
3. Oil resistant
4. Have a screen.

Screen on cables for control and steering shall be connected to the connection box.(K677563)

Cables on transformer shall be made of multi-wire conductors.(K677564)

Multi-wire conductors shall be contracted with end sleeve.(K677565)

Connection of current transformer shall be made with a cable lug and dome washer.(K677566)

Cables shall not lie directly against the tank cover.(K677567)

Cables shall be equipped with pedal protection.(K677568)

Rubber cloth or equivalent that is easily destroyed by solar radiation shall not be used as a liner when strapping cables.(K677569)

Outdoor cables marking shall be made of stainless steel strips with punched text.(K677570)

Cables markings shall be provided on both ends of the cable.(K677571)

Wiring on the transformer shall be connected with stainless steel cables ties or laid in a stainless steel pipe.(K677572)

Metal parts that are not welded to a transformer box or lid shall be provided with a visible earth connection.(K677573)

8.1.13 Equipment and junction box

Enclosure shall be located a maximum of 1.5 m above ground level.(K677575)

Enclosure shall be designed in such a way that condensation water formation is avoided.(K677576)

Enclosure shall be of stainless steel design.(K677577)

Enclosure shall be designed so that the maximum permissible ambient temperature of an appliance or component is not exceeded.(K677578)

Enclosure shall be made with continuous ground heating.(K677579)(Trafikverket only)

Enclosure shall be made with additional heat.(K677580)(Trafikverket only)

Auxiliary heating shall be thermostatically controlled.(K677581)(Trafikverket only)

Enclosure shall be lockable with a padlock.(K677582)(Trafikverket only)

Enclosure shall be made with two fans, placed diagonally on the long side of each enclosure.(K677583)(Trafikverket only) The fan shall be made of stainless steel.(K677584)(Trafikverket only)

Ventilation opening shall be provided with insect protection.(K677585)

Enclosure for outdoor installation shall be made with a roof as protection against rain and snow.(K677586)(Trafikverket only)

Roofs for protection against snow and rain shall not be placed closer than 50 mm above the enclosure.(K677587)(Trafikverket only)

Enclosure shall be furnished with a metal mounting plate for mounting devices and equipment.(K677588)

Enclosure shall be made with standardized mounting methods for industrial electrical equipment.(K677589)

For outdoor-mounted enclosures, the cable entry shall be located on the underside of the enclosure.(K677590)(Trafikverket only)

Enclosure shall be equipped with a stainless steel flange for cable connection, type FL.(K677591)

Upon completion of the installation, the enclosure shall have at least 20% spare space for cables.(K677592)

Upon completion of the installation, the enclosure shall have at least 20% spare space for terminal blocks.(K677593)

Enclosure shall be equipped with PE rail.(K677594)

Terminal block with disconnection plate shall be mounted so that plate falls down and visibly shows that the terminal is in the disassembled position.(K677595)

Terminal block for 400/230 VAC 50 Hz shall be separated from other terminal blocks to avoid confusion with terminal block for other voltages.(K677596)

Terminal block for measuring circuit shall be separated from other terminal blocks to demonstrate special overall function.(K677597)

Terminal block shall be of type Phoenix URTK-BEN or equivalent.(K677598)

Terminal block shall be marked and numbered.(K677599)

Wiring shall be laid so that installation of apparatus or equipment is not made more difficult.(K677600)

Wiring shall be located so that readability of markings or device status is not hindered.(K677601)

Parts shall be numbered with cable, part and terminal numbers.(K677602)

8.1.14 Screw and bolt joints

Screw connections shall be made of stainless steel.(K677604)

Screw connections must be made of stainless steel of the lowest quality EN 1.4401 (A4).(K677605)

Screw connections must be of at least breaking limit class 80 according to ISO 3506-1:2020 Fasteners — Mechanical properties of corrosion-resistant stainless steel fasteners — Part 1: Bolts, screws and studs with specified grades and property classes.(K677606)

Screw connections must be provided with flat washers closest to the painted surface.(K677607)

Ground strap should be silvered.(K677608)

8.1.15 Plates

All plates in sections Equipment plates and Name plate shall be in Swedish when delivered to Trafikverket (K677611) or in Norwegian when delivered to Bane NOR.

Nameplates must be permanently affixed.(K677611)

8.1.15.1 Equipment plates

Each valve, bushing and accessories must be marked with appliance signs showing their type designation.(K677613)

8.1.15.2 Name plate

The nameplate shall be located on the transformer's service side.(K677615)

The nameplate shall contain information in accordance with EN 50329:2003 Railway applications — Fixed installations — Traction transformers.(K677616)

The nameplate shall also contain:(K677617)

• Type of oil
• Supplier of oil
• Oil level as a function of oil temperature
• Information about expansion vessels is equipped with an air bag.

A separate plate shall show the oil level compared to the oil temperature in the expansion vessel.(K677618)

8.1.16 Valves for oil sampling

Valve for oil handling, including oil sampling, shall be of the ball valve type.(K677620)

Ball valve shall be:(K677621)

1. Made of stainless steel housing
2. Made with hand lever with spring return
3. Intended for operating temperature from a maximum of -40 ° C to a minimum of + 120 ° C.

Ball valve shall not be painted.(K677622)

Hexagon plug shall be supplied with ball valve.(K677623)

The valve shall be equipped with a control lock for involuntary opening.(K677624)

Valve shall be lockable with padlock.(K677625)(Trafikverket only)

Valve shall be lockable with padlock (not delivered with padlock).(Bane NOR only)

Valves that are seldom used shall be maneuvered with screws and nuts.(K677626)

Valve shall be marked with V and a serial number xx, for example V01.(K677627)

Valve markings shall be found on the device location drawing.(K677628)

8.1.17 Impact recorder

Before starting delivery, an impact recorder shall be mounted on a transformer.(K677630)

Impact recorder shall not be removed before the transformer reach its final destination.(K677631)

The shock gauge shall not be of a mechanical type.(K677632)

The shock gauge shall be set to the correct date and time before transport begins.(K677633)

The limit values in the x, y, z directions shall be notified to the customer before transport can begin.(K677634)

Witnessing of measurement results of impact recorder shall be performed together with a representative from the customer.(K677635)

The customer shall have access to a copy of the measurement result where the limit values are also included.(K677636)

8.2 Monitoring equipment

8.2.1 General requirement

Equipment for monitoring shall be performed in accordance with EN 50216-1:2002 Power transformer and reactor fittings — Part 1: General.(K677639)

Monitoring systems shall be supplied with 110 VDC.(K677640)

Analogue instrument meter shall be able to be read standing from the ground.(K677641)

Analogue instrument meter shall be made with indicating hands.(K677642)

Analogue instrument meter shall be made with maximum indicators that easily can be reset with a touch.(K677643)

Signal contact sets shall be equipped with a separate contact for signal and trip circuit.(K677644)

Enclosure shall be made in at least enclosure class IP 55 according to UNE EN 60529:2018 Degrees of protection provided by enclosures (IP Code)(K677645)

Signal contact shall be made with at least one normally closed contact, one normally closed and one normally open contact or one alternating contact per function.(K677646)

8.2.2 Oil level monitors for expansion vessel

Transformer shall be equipped with oil level indicator with guard.(K677648)

Oil level indication shall be performed in accordance with EN 50216-5:2002 Power transformer and reactor fittings Liquid level, pressure and flow indicators, pressure relief devices and dehydrating breathers.(K677649)

The guard's contact set shall be on the ground level, but not higher than 1.5 m.(K677650)

Oil level indicators for expansion vessels shall be equipped with separate closing contacts for fault and alarm signals.(K677651)

Oil level indicator with guard shall be made as a pointing instrument with float.(K677652)

Sign with temperature and level diagram shall be mounted next to the oil level indicator.(K677653)

The respective temperature and level diagram scale of the indicator shall be 0 to 1 or 0 to 100.(K677654)

Scale shall be graded by tenths, 0.1 or 10.(K677655)

Data stated on the sign shall have the same scale as pointing instruments.(K677656)

8.2.3 Gas and oil actuated relay (Buchholtz relay)

Transformer shall be equipped with oil and gas actuated protection relay, type buchholz relay.(K677658)

Gas protection relay shall be made in accordance with EN 50216-2:2002 Power transformer and reactor fittings - Part 2: Gas and oil actuated relay for liquid immersed transformers and reactors with conservator(K677659)

Ball valves shall be arranged on each side of the gas protection relay.(K677660)

Contact set shall be provided with closing contacts for:(K677661)

• Slow gas development (alarm signal).
• For rapid changes in the oil status.
• Oil level too low.
• For rapid gas development (triggering of relay).

Gas protection relay shall be available for testing and sampling from tank cover.(K677662)

Gas protection relay shall be equipped with sight glass.(K677663)

For function tests of gas protection relay, a valve shall be provided for taking gas samples and for blowing air.(K677664)

Gas protection relay shall be equipped with bypass line with ball valve.(K677665)

Gas protection relay shall be connected to tank with flexible metal hose.(K677666)

The closing contacts shall be suitable for 110 VDC and 230 VAC.(K677667)

The contacts in the relay shall not contain mercury.(K677668)

8.2.4 Oil temperature guard

Transformer shall be equipped with temperature monitor with guard in at least two level signals; fault and tripping signals.(K677670)

Oil temperature monitor with guard shall be an analogue instrument with a mechanical capillary tube sensor.(K677671)

Capillary tubes shall be fitted with cable protector.(K677672)

8.2.5 Winding temperature and oil temperature sensors

Temperature sensors shall be designed in accordance with EN 50216-11:2008 Power transformer and reactor fittings — Part 11: Oil and winding temperature indicators.(K677674)

Transformer shall be equipped with temperature indication with guard in at least two levels, alarm and trip signal.(K677675)

Temperature signal shall be available in the junction box as a 4–20 mA signal.(K677676)(Trafikverket only)

Signal converters must be designed to give alarm in the event of a sensor interruption or sensor short circuit.(K677677)(Trafikverket only)

Alarm signal shall be of the quiescent current type.(K677678)(Trafikverket only)

Signal converters shall be placed in a junction box.(K677679)(Trafikverket only)

Measurement of winding temperature and oil temperature shall be performed with a Pt 100 sensor.(K677680)(Trafikverket only)

Thermometer case must be of type A1 according to EN 50216-4:2015 Power transformer and reactor fittings — Part 4: Basic accessories (earthing terminal, drain and filling devices, thermometer pocket, wheel assembly) (K677681)

Thermometer case shall comply with DIN 42554.(K677682)

Thermometer case shall be made with inch threads.(K677683)

Winding temperature gauges can be excluded after approval from the customer.(K677684)(Trafikverket only)

Winding temperature gauges can be included only after approval from the customer.(Bane NOR only)

8.2.6 Pressure Relief valves

Pressure relief valve must be designed according to EN 50216-5:2002 Power transformer and reactor fittings Liquid level, pressure and flow indicators, pressure relief devices and dehydrating breathers.(K677686)

8.3 Documentation

8.3.1 General considerations

Documentation shall be carried out in accordance with TDOK 2013:0640 Elkraftanläggningar. Dokumentationskrav.(K677688)

Documentation shall be carried out in accordance with STY605016.(Bane NOR only)

All documents shall be provided in PDF and DWG format and be written in either English, Swedish or Norwegian.(Bane NOR only)

8.3.2 Scope

The following documents shall be provided:(Bane NOR only)

• Layout drawings for the finished transformer.
• Circuit diagrams, connection tables and equipment lists for the equipment installed inside and outside.
• Oil level diagrams for the expansion vessel (level vs. outside temperature).
• Documents for the sealing system Sealing system (see section Specification of the sealing system).
• All quality-related documents for each transformer.
• Test reports for routine tests (see section Routine tests), type tests (see section Type tests) and special tests (see section Special tests) of the transformer.
• Equipment descriptions in their original form and, where appropriate, the same descriptions translated into Swedish or Norwegian.
• Original instruction manuals for installation and commissioning and, where appropriate, the same manuals translated into Swedish or Norwegian.
• Original instruction manuals for transformer maintenance and, where appropriate, the same manuals translated into Swedish or Norwegian.

9 Type approval

Each new transformer design of a make, size and type, shall be type approved by the customer before delivery.(K677690)

An transformer type-approved transformer shall have passed the approved result:(K677691)

1. Design review
2. ITP (Inspection and testplan)
3. Checking type test reports on transformer accessories.
4. Routine test
5. Type test
6. Special tests

Type tests Reports on accessories (bushings, monitoring equipment, etc.) shall be tested in accordance with the respective SS-EN standard specified at the end of this requirements document.(K677692

Type-approved transformer design may not be changed in any respect without the customer approving the design change.(K677693)

The final documentation shall state that the Swedish Transport Administration has participated in the design inspection of the transformer.(K677694)

Design inspection shall be performed in accordance with Chapter 9.1.(K677695)

9.1 Design review

9.1.1 General requirements

Design inspection shall be seen as quality assurance of the transformer.(K677698)
Type test reports shall be presented on the following devices in connection with the design review:(K677699)

1. Gas guard
2. Oil level sensor
3. Temperature sensor
4. Pressure switch
5. Implementations
6. Oil cooler
7. Valves
8. Pressure relief valve.

9.1.1.1 Transformer

1. Transformer rating plate shall be presented.(K677701)
2. Transformer weights with and without oil shall be present.(K677702)
3. Dimensions of the installed transformer shall be present.(K677703)
4. Estimated losses, idle and load losses.(K677704)

9.1.1.2 Transformer core

Construction of transformer core shall be presented where the following must appear:(K677706)

1. Dimensions
2. Bonding of sheet metal packages
3. Magnetic fluxes

9.1.1.3 Transformer windings

Construction of transformer windings shall be presented where the following must appear:(K677708)

1. Schema
2. Design of windings
3. Stagnation
4. Cooling ducts
5. Dimensions of conductors and complete windings
6. Material specification for conductors and insulation
7. Manufacturing and control methods.

9.1.1.4 Connection between bushing and winding

At least the following data shall presented for the connection between the bushing and the winding during design examination.(K677710)

1. Dimensions of connection
2. Location in tank
3. Type of connection to bushing and to winding.

9.1.1.5 Complete active part

Construction of a complete active part shall be presented where the following shall appear:(K677712)

1. Layout
2. Material specification for bracing and insulation details
3. Connection between press beams
4. Connection between upper and lower yoke
5. Design of the axial and radial supports of the windings
6. Clamping forces in winding
7. Bracing and insulation details
8. Mechanical resonant frequency with calculation of calculation method
9. Methods for mounting and clamping
10. Estimated sound level.

9.1.1.6 Transformer tank, expansion vessel, pipe and painting

Construction of transformer tank, expansion vessel, pipe and painting shall be presented where the following must appear:(K677714)

1. Seals
2. Painting
3. Painting system.

9.1.1.7 Devices on transformer

Construction of device on transformer shall be presented, including the following devices:(K677716)

1. Gas guard (Buchholtz)
2. Oil level sensor
3. Temperature sensor
4. Pressure sensor
5. Device box
6. Grommets
7. Oil cooler
8. Valves
9. Pressure relief valve.

9.1.1.8 Short-circuit endurance

Reporting and calculation of transformer short-circuit resistance where the following shall be presented:(K677718)

1. Forces to which the windings are subjected in the event of a short circuit
2. Transformer resistance to all forms of displacement and deformation of windings, bracing and core.

9.1.1.9 Tolerances

Report of manufacturing and assembly tolerances where the following shall be presented:(K677720)

1. Manufacturing tolerances for steel parts
2. Tolerances when assembling steel parts
3. Tolerances when mounting windings.

9.1.1.10 Calculations

The following calculations shall be presented to the customer:(K677722)

1. Description of how internal voltages in the transformer are calculated
2. Explanation of how calculations for tests of surge protection have been carried out
3. Description of how the short-circuit impedance is calculated.

9.1.1.11 Design and method changes

The customer shall be informed of the design change.(K677724)

Design change must be approved by the customer.(K677725)

9.1.1.12 Routines

The following shall be presented by the supplier:(K677727)

1. Routines for manufacturing follow-up from the design office at the first copy
2. Quality control plan for steel parts
3. Painting routines for steel details
4. Control routines and reports for finished steel parts
5. Quality control plan for transformer
6. Control routines and reports for transformer
7. Quality control plan for assembly at the delivery site
8. Instructions for installation and commissioning on the installation site
9. Routines for transporting the transformer.

9.2 Testing

9.2.1 General considerations

The final documentation shall state that Trafikverket has witnessed the test of the transformer.(K677730)(Trafikverket onely)

The final documentation shall state that Bane NOR has witnessed the test of the transformer.(Bane NOR only)

Testing shall be performed according to EN 60076-1:2011 Power transformers — Part 1: General.(K677731)

Testing of the transformer shall be performed in a laboratory that meets the requirements according to ISO/IEC 17025:2017 General requirements for the competence of testing and calibration laboratories.(K677732)

The customer or his representative shall be present when testing the transformer, unless otherwise agreed with the customer.(K677733)

Signed preliminary test report shall be provided to the customer after the test has been completed.(K677734)

Test reports shall be performed in accordance with ISO/IEC 17025:2017 General requirements for the competence of testing and calibration laboratories.(K677735)

The final test report shall be delivered to the customer after the test has been completed.(K677736)

9.2.2 Type test

For type tests of the transformer, at least the following tests shall be performed:(K677738)

1. Temperature-rise type test according to EN 60076-2:2011 Power transformers — Part 2: Temperature rise for liquid-immersed transformers.
2. Insulation test, short shock (Dielectric type tests) according to EN 60076-3:2013 — Power transformers — Part 3: Insulation levels, dielectric tests and external clearances in air.
3. Determination of sound level (determination of sound level) according to IEC 60076-10:2016 Power transformers — Part 10: Determination of sound levels.

1. Determination of idle losses and current according to EN 60076-1:2011 Power transformers — Part 1: General.

Special tests of the transformer shall be completed and approved comprising the following:(K677739)

1. Measurement and calculation of zero sequence impedance
2. Short-circuit withstand test according to EN 60076-5:2006 — Power transformers — Part 5: Ability to withstand short-circuit

9.2.2.1 Heat test

The heat test shall be performed according to the load cycle specified in chapter general requirements.(K677741)

The heat test shall be performed with maximum harmonic stresses which are specified under chapter general requirements.(K677742)

Maximum harmonic stresses and load cycle shall be tested at the same time.(K677743)

Whether the heat test is to take place with or without the housing shall be decided in consultation with the transformer manufacturer.(K677744)

9.2.2.2 Control of zero phase-sequence impedance

Measurement and calculation of zero sequence impedance must be performed as part of technical approval.(K677746)

Measurement of short-circuit impedance (u_k) and zero-sequence impedance shall be performed according to Figur 5.(K677747)

The rated power of the autotransformer, S_n is described according to the following formula:(K677748)

[math]S_n = U_{n1} \times I_{n1} = U_{n2} \times I_{n2} [/math]

Conditions: In the case of a short-circuit across the primary winding (A and B terminals), a 16.7 Hz current (I_n2) is induced between A and 0.

The short-circuit voltage (u_k) is required to achieve primary rated current (I_n1).(K677750)

Primary rated current (I_n1) shall be noted together with the measured current (I₂) in the test protocol.(K677751)

The transformer’s zero phase-sequence impedance is calculated using the following formula:(K677752)

[math]Z_0 = {\dfrac{2 \times u_k}{I_2}}[/math]

Figur 5: Measurement of short-circuit voltage (u_k) and zero phase-sequence impedance

[math]u_k = I_2 \times Z_T = u_0[/math]

u₀ is zero sequence source

[math]\dfrac {N_1} {N_2} = 2[/math]

Conditions: The following formulas can also be used if needed

[math]I_2 = 2 \times I_0 \quad Z_0 = \dfrac{u_0}{I_0}[/math]

[math]Z_0 = \dfrac{Z_T \times I_2}{\left (\tfrac{I_2}{2} \right )} = 2 \times Z_T = \dfrac{2 \times u_k}{I_2}[/math]

9.2.2.3 Short circuit endurance

The short-circuit test is performed to simulate that the transformer is exposed to real short-circuits in the 16.5/30 kV network.

For the purposes of short-circuit testing, the transformer shall be magnetized with a voltage at 30 kV between terminals A and B, as in Figur 4.(K677756)

The short-circuit performed with breakers between terminals B and 0 (15 kV).(K677757)

The test circuit shall be adjusted in such a way that the stationary short-circuit current is at least 6 kA r.m.s. in both windings.(K677758)

The duration of the short-circuit current shall be at least 300 ms (five periods at 16.7 Hz).(K677759)

The short-circuit test includes nine steps with a total of 50 operations.(K677760)

The phase angle for switching on the short circuit must be changed between each step according to Tabell 3.

Tabell 3: Test sequence for the short-circuit test

Step no.	Number of activations	Angle at time of activation
1	4	90º
2	4	70º
3	4	50º
4	6	30º
5	3	10º
6	4	0º
7	5	50º
8	5	70º
9	15	90º

Angle at time of activation, is the angle calculated from the voltage's zero crossing, at which the short-circuit is to be provoked.

Following each trial series, a measurement of the transformer’s reactance shall be made in accordance with Measurement and calculation of zero phase-sequence impedance.(K677762)

Prerequisite: One condition for a satisfactory short-circuit test is that the transformer’s reactance following the entire test sequence shall not have changed by more than 2 %.

In cases where short-circuit impedance deviations are greater than 2 %, or where the short-circuit testing had to be discontinued for another reason, the transformer shall be dismantled bit by bit.(K677764)

The customer or it's representative must be present during the disassembly.(K677765)

The reason for any short-circuit impedance deviation shall then be investigated by the supplier and reported to the customer.(K677766)

After the fault/cause has been found and rectified, the short-circuit test shall be repeated in accordance with this chapter.(K677767)

Only when the deviation for short-circuit impedance is less than 2% is the test considered approved.(K677768)

After passing the test, the autotransformer must be lifted out of its tank for inspection by the customer's representative.(K677769)

After reassembly, the transformer must be routinely tested according to EN 60076-1:2011 Power transformers - Part 1: General.(K677770)

Prerequisite: After performed and approved routine, type and special testing, the autotransformer is type approved and ready for delivery.

9.2.3 Routine tests

Routine testing of type-certified transformers includes all the routine tests listed in EN 60076-1:2011 Power transformers - Part 1: General.(K677773)

PD measurement according to EN 60076-3:2013 — Power transformers — Part 3: Insulation levels, dielectric tests and external clearances in air.(K677774)

Checking of surface treatment layer thickness (Check of external coating) must be carried out according to ISO 2178:2016 Non-magnetic coatings on magnetic substrates — Measurement of coating thickness — Magnetic method.(K677775)

Checking the durability of the surface treatment according to ISO 2409:2020 Paints and varnishes — Cross-cut test.(K677776)

9.3 On site test

9.3.1 Test before energization

The following tests must be approved by the Purchaser's representative before voltage can be applied:(K677779)

1. Oil quality test
2. Dissolved gas analysis (DGA)
3. Winding resistance measurement
4. Turnover measurement
5. Functional tests on all accessories must be carried out and recorded.

9.3.2 Test during operation

Oil sampling according to Requirements: 03:745: Insulating vests for electric power equipment.(K677781)(Trafikverket only)

These oil tests should be seen as part of the warranty on the transformer.(K677782)

Oil quality samples must be taken after 24 months which must contain at least:(K677783)

1. Checking the voltage strength
2. Control of moisture ratio.

10 Environment

10.1 Recyclability

Recyclability for constituent metals, insulation and filling materials as well as packaging materials must be stated in the technical documentation.(K677786)

The responsibility of either the supplier or the customer, for the destruction or reuse of replaced, consumed, or damaged material must be clarified before the contract is signed.(K677787)

11 CHECKLIST

For each point in Tabell 4, the tenderer shall indicate whether the requirement has been satisfied. In the case of deviations from the stated requirements, the nature of and reason for each deviation shall be stated under the relevant point. Furthermore, the tenderer shall refer to the point in the tender document where it is shown that each requirement is or is not met. This checklist shall also be used at the time of delivery.

Tabell 4: Checklist

Chapter/Section	Requirement satisfied (Yes/No)	Reference to the point in the tender document where it is shown that the requirement is or is not met	Any comments
TECHNICAL PERFORMANCE General considerations Expansion vessel Bottom valve Dehydrating breather Valves for oil sampling Monitoring equipment Equipment types Gas and oil relay (Buchholz) Oil temperature gauges and oil temperature monitors Oil level displays and oil level monitors for the expansion vessel Cable layout in the trans-former Screw and bolt joints Sealing system Instrument transformers Equipment and junction box Transformer tank General considerations Ladder Grounding connections Lifting eyes Oil system Transformer tank cover Centring point Dimensions Plates Equipment plates Rating plates Bushings and surge arrestors Bushings Surge arresters Surface treatment Painting Documentation General considerations Scope

12 References

AFS 2009:2 Arbetsmiljöverkets författningssamling — Arbetsplatsens utformning

IEC 60050 utg. 1:2014 Amendment 1 — International Electrotechnical Vocabulary — Part 161: Electromagnetic compatibility; Part 732: Computer network technology; Part 851: Electric welding

IEC 60076-7:2018 Power transformers — Part 7: Loading guide for mineral-oil-immersed power transformers

Krav:03:745: Isolervästskor för elkraftsutrustning

ISO 3506-1:2020 Fasteners — Mechanical properties of corrosion-resistant stainless steel fasteners — Part 1: Bolts, screws and studs with specified grades and property classes

ISO 12944-1:2017 Paints and varnishes — Corrosion protection of steel structures by protective paint systems — Part 1: General introduction

SS-EN ISO 12944-2, ed. 1: 1998 Paint and varnish — Corrosion protection of steel structures for painting — Part 2: Environmental classification

ISO 12944-5:2019 Paints and varnishes — Corrosion protection of steel structures by protective paint systems — Part 5: Protective paint systems (ISO 12944-5:2007)

ISO/IEC 17025:2017 General requirements for the competence of testing and calibration laboratories

ISO 2178:2016 Non-magnetic coatings on magnetic substrates — Measurement of coating thickness — Magnetic method

ISO 2409:2020 Paints and varnishes — Cross-cut test

ISO 1461:2009 Hot dip galvanized coatings on fabricated iron and steel articles — Specifications and test methods

EN 50163:2004 Railway applications — Supply voltages of traction systems

EN 50180-1:2015 Bushings above 1 kV up to 52 kV and from 250 A to 3,15 kA for liquid filled transformers — Part 1: General requirements for bushings.

EN 50216-1:2002(MAIN) Power transformer and reactor fittings — Part 1: General

EN 50216-2:2002 Power transformer and reactor fittings — Part 2: Gas and oil actuated relay for liquid immersed transformers and reactors with conservator

EN 50216-4:2015 Power transformer and reactor fittings — Part 4: Basic accessories (earthing terminal, drain and filling devices, thermometer pocket, wheel assembly)

EN 50216-5:2002 Power transformer and reactor fittings Liquid level, pressure and flow indicators, pressure relief devices and dehydrating breathers

EN 50216-6:2002 Power transformers and reactor fittings Cooling equipment. Removable radiators for oil-immersed transformers

EN 50216-8:2005 Power transformer and reactor fittings Butterfly valves for insulating liquid circuits

EN 50216-11:2008 Power transformer and reactor fittings — Part 11: Oil and winding temperature indicators

EN 50329:2003 Railway applications — Fixed installations — Traction transformers

IEC 61869-2:2012 Instrument transformers — Part 2: Additional requirements for current transformers.

IEC 61869-3:2011 Instrument transformers — Part 3: Additional requirements for inductive voltage transformers

EN 60076-1:2011 Power transformers — Part 1: General

EN 60076-2:2011 Power transformers — Part 2: Temperature rise for liquid-immersed transformers

EN 60076-3:2013 Power transformers — Part 3: Insulation levels, dielectric tests and external clearances in air

EN 60076-5:2006 Power transformers — Part 5: Ability to withstand short-circuit

IEC 60076-10:2016 Power transformers — Part 10: Determination of sound levels

EN 60099-4:2014 Surge arresters — Part 4: Metal-oxide surge arresters without gaps for a.c. systems

UNE EN 60529:2018 Degrees of protection provided by enclosures (IP Code)

EN 61936-1 Power installations exceeding 1 kV a.c. — Part 1: Common rules

TDOK 2013:0640 Elkraftanläggningar. Dokumentationskrav

TDOK 2014:0774: BVS 543.19300 Kraftförsörjningsanläggningar — Elektriska krav på fordon med avseende på kompatibilitet med infrastrukturen och andra fordon

TDOK 2017:0686: Riktlinje Buller och Vibrationer vid planering av bebyggelse