General ABB specification for HiDry Power Transformers

1 BU Transformers "Dry-type Power Transformers "1 LES100088-ZBRev.: AIssued and approved byDate of release:Language:Page:PGTR PG Dry2016-11-11en1/ 44 Author:ReplacesM. Berroga nGeneral ABB specification for HiDry Power Transformers Copyright 2016 ABB. All right , use or disclosure to third parties without express authority is strictly of Contents1 SCOPE .. laws, standards and codes .. standards .. 43 SERVICE CONDITIONS .. conditions .. qualification levels .. 64 TECHNICAL ASPECTS .. of Transformers .. of windings .. of phases .. system .. Power .. Rise limit .. designed for high cooling medium temperatures .. designed for operation at altitudes greater than 1000 m .. voltages .. Voltages .. Voltages .. frequency .. voltage tappings .. circuit circuit levels and minimum air clearances.

2 And MV neutral .. and short circuit impedances .. conditions .. load current .. current .. temperature of the of withstand short-circuit .. levels .. dimensions .. , environmental and fire behavior classes .. 135 DESIGN REQUIREMENTS .. 13 General ABB specification for HiDryPower Transformers1 LES100088-ZBRev.:APage:2/ 44 Copyright 2016 ABB. All right , use or disclosure to third parties without express authority is strictly and frame .. lugs and pulling Points .. earthing .. and wheel frame .. assembly .. and LV windings assembly .. connections .. / Medium Voltage connections .. Voltage connections .. resin insulation .. 166 ACCESSORIES AND AUXILIARIES .. monitoring .. plates .. markings .. plates .. devices .. terminals .. devices .. boxes.

3 197 MAIN connections .. tap changer (OLTC) .. Requirements .. enclosure for enclosure for outdoors .. / wall-bushings for 338 PROTECTIVE PAINTING .. 339 TESTS .. and classification of tests .. tests .. tests .. tests .. at factory .. statements for the tests .. description .. tests .. tests .. tests .. 40 General ABB specification for HiDryPower Transformers1 LES100088-ZBRev.:APage:3/ 44 Copyright 2016 ABB. All right , use or disclosure to third parties without express authority is strictly on field .. 4010 SUPPLY REQUIREMENTS .. and storage .. for the offer .. for homologation, certification and approval .. diagrams .. 4312 REVISION .. 44 General ABB specification for HiDryPower Transformers1 LES100088-ZBRev.:APage:4/ 44 Copyright 2016 ABB. All right , use or disclosure to third parties without express authority is strictly ScopeThe scope of this document is to provide technical requirements for the supply of the dry-typelarge Power Transformers to be used in the distribution networks / sub-transmission lines Reference laws, standards and codesThe lists of some reference laws and standards, relevant for this document, are reported equipment will be designed, manufactured and tested in compliance with the IEC,CENELEC, ISO, IEEE, codes and standards and the following codes and standards in particularshown of codes and standards:In case of conflict between this specification and any of the referenced codes and standards,the following order of preference shall apply.

4 This specification Referenced codes and standards Acceptable alternative codes and LawsFor the European countries, the performance efficiency of the Transformers shall comply withthe related European Commission Regulation (EU) No 548/2014 on Implementing Directive2009/125/C regarding small, medium and large Power Transformers (in force from July 2015).For other countries, national laws will have to be into consideration. For instance in Spain will beas follows: REAL DECRETO 614/2001, de 8 de junio, sobre disposiciones m nimas para la protecci n de lasalud y seguridad de los trabajadores frente al riesgo el ctrico. Reglamento Sobre Condiciones T cnicas y Garant as De Seguridad en Centrales El ctricas,Subestaciones y Centros De Transformaci n. Council Directive 67/548/EEC on the approximation of the laws, regulations and administrativeprovisions relating to the classification, packaging and labelling of dangerous substances.

5 Council Directive 1999/13/EC, of 11 March 1999, on the limitation of emissions of volatile organiccompounds due to the use of organic solvents in certain activities and International standardsFor America destinations the reference standard are the IEC/IEEE/ISO and for Europedestinations the reference standard are the correspondent European standards (EN).EN 50629 Energy performance of large Power Transformers (Um > 36 kV or Sr 40 MVA) General ABB specification for HiDryPower Transformers1 LES100088-ZBRev.:APage:5/ 44 Copyright 2016 ABB. All right , use or disclosure to third parties without express authority is strictly 60076 -1 Power Transformers Part 1: GeneralIEC 60076 -2 Power Transformers Part 2: Temperature riseIEC 60076 -3 Power Transformers Part 3: Insulation levels, dielectric tests and externalclearances in airIEC 60076 -5 Power Transformers Part 5: Ability to withstand short circuitIEC 60076 -10 Determination of sound levelsIEC 60076 -11 Power Transformers Part 11: Dry-type transformersIEC 60076 -12 Power Transformers Part 12: Loading guide for dry-type powertransformersIEC 60076 -18 Power Transformers Part 18: Measurement of frequency responseIEC 60068-3-3 Environmental testing - Part 3-3.

6 Guidance - Seismic test methods forequipmentIEC 60085 Thermal evaluation and classification of electrical insulationIEC 60214-1 Tap-Changers Part 1: Performance requirements and test methodsIEC 60214-2 Tap-Changers Part 2: Application guideIEC 60529 Degree of protections provided by enclosures (IP Code)ISO 12944 Paints and varnishes Corrosion protection of steel structures by protectivepaint systemsAnd all the standards referred in those listed the date of issue is not mentioned in the list above, the date to be taken as reference isthat of the standard in force when the present document has been Service GeneralUnless otherwise specified the normal service conditions of Clause 4 of IEC 60076 -11 are generally used for step-down voltage purpose but they can also be used asstep-up. In the network, they could occasionally be subjected to frequent energizations, overvoltages and Standard conditionsStandard service conditions are as follows: Altitude: Maximum 1000 meters above sea level (it must prevail the buyer s site conditions).

7 Maximum ambient temperature: Never over 40 C and never below - 5 C (it must prevail thebuyer s site conditions).In addition, an ambient air temperature never exceeding: 30 C average in any one day (it must prevail the buyer s site conditions). 20 C average in any one year (it must prevail the buyer s site conditions). General ABB specification for HiDryPower Transformers1 LES100088-ZBRev.:APage:6/ 44 Copyright 2016 ABB. All right , use or disclosure to third parties without express authority is strictly forbidden.(Note: other environmental conditions under customer request may be accepted). Seismic qualification levelsThe seismic qualification level must be in accordance with the final site default, all designs shall be prepared in order to withstand zones 1, 2A and 2B, it means: Seismic horizontal acceleration: 0,2 g Seismic vertical acceleration.

8 0,1 gFor other higher seismic demands ( zone 3, 4, u others) the Manufacturer may produce areport to demonstrate the seismic qualification level if InstallationThe type of installation will be preferably case customer requires an outdoors installation, the transformer needs to be protectedmechanically with a metal or civil housing, in order to guarantee the IP degree depending on theenvironmental Technical aspectsThe transformer shall be designed so that they can deliver continuously its rated current understeady loading conditions without exceeding the temperature rise, assuming that the appliedvoltage is equal to the rated voltage and that the supply is at rated the definitions IEC 60076 -11 Types of transformersThis document is applicable for dry-type large Power three phase Transformers , step-up (forGSU)

9 Or step-down and refers from the following type: separate windings transformer (TR).Separate windings Transformers are usually HV/LV, but they can also be HV/HV or MV/MV, insuch cases they are conventionally indicated as HV/MV in the present or single-phase Transformers can be also considered under customer Number of windingsNumber of windings should be preferably two (2).Tertiary winding can be considered under customer Number of phasesNumber of phases should be preferably three (3).Also one-phase Transformers are available (1) General ABB specification for HiDryPower Transformers1 LES100088-ZBRev.:APage:7/ 44 Copyright 2016 ABB. All right , use or disclosure to third parties without express authority is strictly Cooling systemCooling system for dry-type large Power Transformers shall be natural air ventilation (AN) up tospecified rating or/and with forced cooling (AF) to a higher cooling systems can be considered under customer Rated powerRated Power should be preferably 1 MVA, 2 MVA, 5 MVA, 10 MVA, MVA, 16 MVA, 20 MVA, 25 MVA, 30 MVA, 40 MVA and 63 ratings can be also Temperature Rise limitThe temperature rise of each winding of the transformer, designed for operation at normalservice conditions, shall not exceed the corresponding limit specified in the Table 1 when testedin accordance with Clause 23 of IEC 1 Insulation system temperature(see Note 1)

10 CAverage winding temperature riselimits at rated current(see Note 2) K180 (H)125 NOTE 1 Letters refer to the temperature classifications given in IEC 2 Temperature rise measured in accordance with Clause 23 of IEC temperature rise of the winding is defined as the average temperature of the winding minusyearly average of the temperature of the external cooling maximum temperature occurring in any part of the winding insulation system is called thehot-spot temperature. The hot spot temperature shall not exceed the rated value of the hotspotwinding temperature specified in the Table 2 Insulation systemTemperature CRated hot spot windingTemperature CMaximum hot-spot windingTemperature C180 (H)170205 Components used as insulating material may be used separately or in combination providingthat their temperature does not exceed the values given for the appropriate insulation systemtemperature in accordance with the requirements as prescribed in the left hand column of temperature of the core, metallic parts and adjacent materials shall not reach a value thatwill cause damage to any part of the ABB specification for HiDryPower Transformers1 LES100088-ZBRev.