EN 50541-1:2011

Three phase dry-type distribution transformers 50 Hz, from 100 kVA to 3 150 kVA, with highest voltage for equipment not exceeding 36 kV - Part 1: General requirements

This European Standard covers dry type transformers from 100 kVA to 3 150 kVA intended for operation in three phases distribution networks, for indoor continuous service, 50 Hz, natural cooling, with two windings: − a primary (high voltage) winding with a highest voltage for equipment of 3,6 kV to 36 kV; − a secondary (low voltage) winding with a highest voltage for equipment not exceeding 1,1 kV. For outdoor application, special design or enclosure (enclosure with adapted IP and IK degrees protections) should be requested. NOTE 1 This European Standard may be applied, as a whole or in part to transformers having windings with more than one rated voltage. In this case the rated power for each coupling ratio should be specified by the purchaser. NOTE 2 For dry type transformers installed in power generating plants, additional requirements, not covered by this European Standard, and alternative requirements may be specified. NOTE 3 For dry type transformers dedicated to wind turbines applications additive requirements are specified in EN 60076-16. The object of this European Standard is to lay down requirements related to electrical characteristics, dimensions and designs of three phases distribution dry type transformers. These transformers should be in accordance with EN 60076-11 for general requirements.

Drehstrom-Trocken-Verteilungstransformatoren, 50 Hz, 100 kVA bis 3 150 kVA, mit einer höchsten Spannung für Betriebsmittel kleiner oder gleich 36 kV - Teil 1: Allgemeine Anforderungen

Transformateurs triphasés de distribution de type sec, 50 Hz, de 100 kVA à 3 150 kVA, avec une tension la plus élevée pour le matériel ne dépassant pas 36 kV - Partie 1: Prescriptions générales

Trifazni suhi distribucijski transformatorji, 50 Hz, od 100 do 3150 kVA, za napetosti, ki ne presegajo 36 kV - 1. del: Splošne zahteve in zahteve za suhi tip transformatorjev za napetosti, ki ne presegajo 36 kV

Ta evropski standard zajema suhi tip transformatorjev med 100 kVA in 3 150 kVA, namenjen za obratovanje v trifaznih distribucijskih omrežjih za neprekinjeno delovanje v zaprtih prostorih, 50 Hz, z naravnim hlajenjem in dvema navitjema: - primarno (visokonapetostno) navitje z najvišjo napetostjo za opremo med 3,6 kV in 36 kV; - sekundarno (nizkonapetostno) navitje z najvišjo napetostjo za opremo, ki ne presega 1,1 kV. Pri uporabi na prostem je treba zahtevati posebno obliko ali ohišje (ohišje s prilagojenimi stopnjami zaščite IP in IK).

General Information

• Status: Withdrawn
• Publication Date: 28-Apr-2011
• ICS: 29.180 - Transformers. Reactors
• Technical Committee: CLC/TC 14 - Power transformers
• Drafting Committee: IEC/TC 14 - IEC_TC_14
• Parallel Committee: IEC/TC 14 - IEC_TC_14
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 17-May-2017
• Completion Date: 25-Jun-2018
• Ref Project: SIST EN 50541-1:2011 - Three phase dry-type distribution transformers 50 Hz, from 100 kVA to 3 150 kVA, with highest voltage for equipment not exceeding 36 kV - Part 1: General requirements

Relations

• Replaces: HD 538.1 S1:1992/A1:1995 - Three-phase dry-type distribution transformers 50 Hz, from 100 to 2500 kVA, with highest voltage for equipment not exceeding 36 kV - Part 1: General requirements and requirements for transformers with highest voltage for equipment not exceeding 24 kV
• Effective Date: 29-Jan-2023
• Replaces: HD 538.2 S1:1995 - Three-phase dry-type distribution transformers 50 Hz, from 100 to 2500 kVA, with highest voltage for equipment not exceeding 36 kV - Part 2: Supplementary requirements for transformers with highest voltage for equipment equal to 36 kV
• Effective Date: 29-Jan-2023
• Replaces: HD 538.1 S1:1992 - Three-phase dry-type distribution transformers 50 Hz, from 100 to 2500 kVA, with highest voltage for equipment not exceeding 36 kV - Part 1: General requirements and requirements for transformers with highest voltage for equipment not exceeding 24 kV
• Effective Date: 29-Jan-2023
• Replaced By: EN 50588-1:2015 - Medium power transformers 50 Hz, with highest voltage for equipment not exceeding 36 kV - Part 1: General requirements
• Effective Date: 29-Jan-2023

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Trifazni suhi distribucijski transformatorji, 50 Hz, od 100 do 3150 kVA, za napetosti, ki ne presegajo 36 kV - 1. del: Splošne zahteve in zahteve za suhi tip transformatorjev za napetosti, ki ne presegajo 36 kVDrehstrom-Trocken-Verteilungstransformatoren, 50 Hz, 100 kVA bis 3 150 kVA, mit einer höchsten Spannung für Betriebsmittel kleiner oder gleich 36 kV - Teil 1: Allgemeine AnforderungenTransformateurs triphasés de distribution de type sec, 50 Hz, de 100 kVA à 3 150 kVA, avec une tension la plus élevée pour le matériel ne dépassant pas 36 kV - Partie 1: Prescriptions généralesThree phase dry-type distribution transformers 50 Hz, from 100 kVA to 3 150 kVA, with highest voltage for equipment not exceeding 36 kV - Part 1: General requirements29.180Transformatorji. DušilkeTransformers. ReactorsICS:Ta slovenski standard je istoveten z:EN 50541-1:2011SIST EN 50541-1:2011en01-julij-2011SIST EN 50541-1:2011SLOVENSKI
STANDARDSIST HD 538.2 S1:1997SIST HD 538.1 S1:1997/A1:1997SIST HD 538.1 S1:19971DGRPHãþD

EUROPEAN STANDARD EN 50541-1 NORME EUROPÉENNE
EUROPÄISCHE NORM April 2011
CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2011 CENELEC -
All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50541-1:2011 E
ICS 29.180 Supersedes HD 538.1 S1:1992 + A1:1995, HD 538.2 S1:1995
English version
Three phase dry-type distribution transformers 50 Hz, from 100 kVA to 3 150 kVA, with highest voltage for equipment not exceeding 36 kV -
Part 1: General requirements
Transformateurs triphasés de distribution de type sec, 50 Hz, de 100 kVA à 3 150 kVA, avec une tension la plus élevée pour le matériel ne dépassant pas 36 kV -
Partie 1: Prescriptions générales
Drehstrom-Trocken-Verteilungstransformatoren, 50 Hz, 100 kVA bis 3 150 kVA, mit einer höchsten Spannung für Betriebsmittel kleiner oder gleich 36 kV -
Teil 1: Allgemeine Anforderungen
This European Standard was approved by CENELEC on 2011-01-02. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN 50541-1 on 2011-01-02. This document supersedes HD 538.1 S1:1992 + A1:1995 and HD 538.2 S1:1995. The following dates were fixed: – latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement
(dop)
2012-01-02 – latest date by which the national standards conflicting with the EN have to be withdrawn
(dow) 2014-01-02 __________ SIST EN 50541-1:2011

– 3 – EN 50541-1:2011 Contents 1Scope . 52Normative references . 53Electrical characteristics . 63.1Rated power . 63.2Highest voltages for equipment of windings . 63.3Rated voltages of windings . 63.3.1For the high-voltage winding . 63.3.2For the low voltage winding . 63.4Tapping . 63.5Connections . 63.6Dimensioning of neutral connection of the low voltage winding . 73.7Short-circuit impedance . 73.8Load loss, no load loss, sound power level and short-circuit impedance . 73.8.1General purpose . 73.8.2Load loss aspect . 73.8.3Sound power level . 83.9Tables of load loss, no load loss, sound level power and short-circuit impedance . 93.9.1Rated voltage ≤ 12 kV short-circuit impedance 4 % . 93.9.2Rated voltage ≤ 12 kV short-circuit impedance 6 % . 103.9.3Rated voltage 17,5 and 24 kV impedance voltage 4 % . 113.9.4Rated voltage 17,5 kV and 24 kV impedance voltage 6 % . 123.9.5Rated voltage 36 kV impedance voltage 6 % . 133.10Tolerances and penalties . 134Tests . 134.1Routine tests . 134.2Type tests . 134.3Special tests . 144.4Insulation levels and dielectric tests . 145Design requirements . 145.1Normal or/and abnormal service conditions . 145.2Climatic, environmental and fire behaviour classes . 145.2.1Climatic classes . 145.2.2Environmental classes . 145.2.3Fire behaviour classes . 156Terminals . 157Enclosure . 158Overall dimensional indications and accessories . 169Efficiency and drop voltage at reference temperature . 179.1Efficiency . 179.2Voltage drop (ûu%) . 18Annex A (informative)
Capitalisation evaluation . 19Bibliography . 20 SIST EN 50541-1:2011

– 5 – EN 50541-1:2011 1 Scope This European Standard covers dry type transformers from 100 kVA to 3 150 kVA intended for operation in three phases distribution networks, for indoor continuous service, 50 Hz, natural cooling, with two windings: − a primary (high voltage) winding with a highest voltage for equipment of 3,6 kV to 36 kV; − a secondary (low voltage) winding with a highest voltage for equipment not exceeding 1,1 kV. For outdoor application, special design or enclosure (enclosure with adapted IP and IK degrees protections) should be requested. NOTE 1
This European Standard may be applied, as a whole or in part to transformers having windings with more than one rated voltage. In this case the rated power for each coupling ratio should be specified by the purchaser. NOTE 2
For dry type transformers installed in power generating plants, additional requirements, not covered by this European Standard, and alternative requirements may be specified.
NOTE 3
For dry type transformers dedicated to wind turbines applications additive requirements are specified in EN 60076-16. The object of this European Standard is to lay down requirements related to electrical characteristics, dimensions and designs of three phases distribution dry type transformers. These transformers should be in accordance with EN 60076-11 for general requirements. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 60076-1 Power transformers - Part 1: General (IEC 60076-1) EN 60076-3 Power transformers - Part 3: Insulation levels, dielectric tests and external clearances in air (IEC 60076-3) EN 60076-10 Power transformers - Part 10: Determination of sound levels EN 60076-11:2004 Power transformers - Part 11: Dry-type transformers (IEC 60076-11:2004) EN 60076-16:201X 1) Power transformers - Part 16: Transformers for wind turbines application (IEC 60076-16) EN 60529 Degrees of protection provided by enclosures (IP Code) (IEC 60529) EN 62262 Degrees of protection provided by enclosures for electrical equipment against external mechanical impacts (IK code) (IEC 62262) EN 62271-202:2007 High-voltage switchgear and controlgear - Part 202: High voltage/low voltage prefabricated substation (IEC 62271-202:2006) ————————— 1) At draft stage. SIST EN 50541-1:2011

for the low voltage winding: 1,1 kV. 3.3 Rated voltages of windings 3.3.1 For the high-voltage winding The rated value of the high voltage winding is above 1,1 kV up to and including 36 kV. 3.3.2 For the low voltage winding The rated voltage shall be chosen among the following preferred values: 400 – 410 – 415 – 420 – 433 V
NOTE
This European Standard may be applied either as a whole or in part, to transformers with rated voltage below 400 V and above 433 V. 3.4 Tapping The high voltage windings can be provided with tapping. The preferred tapping range is either ± 2,5 % or ± (2 × 2,5) % unless otherwise specified, but in any case maximum taps shall not exceed seven positions and the total maximum range shall not exceed 10 %. The tapping range has to be specified by the purchaser or by agreement between manufacturer and purchaser. Tapping selection shall be made off-circuit by the use of bolted links or off-circuit tap changer. 3.5 Connections Vector group: connection shall be Dyn. Clock hour figure shall be 5 or 11. SIST EN 50541-1:2011

– 7 – EN 50541-1:2011 Connection and clock hour figure shall be specified by the purchaser at the enquiry stage in accordance with EN 60076-1. NOTE
This European Standard may be applied, either as a whole or in part, for transformers having connections other than those mentioned above. 3.6 Dimensioning of neutral connection of the low voltage winding The neutral conductor and terminal of the low voltage winding shall be dimensioned for rated current and earth fault current, unless otherwise specified. 3.7 Short-circuit impedance The preferred values of the short-circuit impedance at reference temperature are according to Table 2 to Table 6. The reference temperature for the short-circuit impedance and load-loss shall be the permitted average winding rise as given in column 2 of Table 2 plus 20 °C.
NOTE
Other values of short-circuit impedance may be specified by the purchaser for particular system service conditions, e.g. in the case of parallel options 3.8 Load loss, no load loss, sound power level and short-circuit impedance 3.8.1 General purpose For transformers having preferred values of rated power in accordance with 3.1 the values of load loss (PK), no load loss (PO), short-circuit impedance and sound power level (LWA) are stated in Table 2 to Table 6. 3.8.2 Load loss aspect The reference temperature for the short-circuit impedance and load-loss shall be the permitted average winding rise as given in column 2 of Table 2 plus 20 °C. SIST EN 50541-1:2011

Total calculated load loss LV+HV 11 080 W 9 956 W a If reference temperature 75 °C is used for the calculation of 155 °C insulation system temperature instead of load loss reference temperature of 120°C then the errors on the results of measurement and therefore the guaranties are ~ 11 %.
For copper and aluminium conductors the method to correct the I²R loss from 75 °C to 120 °C according to the reference temperature is:
- K= (120+235)/(75+235)=1,145 for copper; - K= (120+225)/(75+225)=1,15 for aluminium. For EDDY Loss and Stray Loss the method to correct the loss from 75 °C to 120 °C according to the r
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