International Standards and Conformity Assessment for all electrical, electronic and related technologies



Reference EN 50464-1:2007/A1:2012
Title Three-phase oil-immersed distribution transformers 50 Hz, from 50 kVA to 2 500 kVA with highest voltage for equipment not exceeding 36 kV - Part 1: General requirements
Project Number 22806
Abstract/Scope This document covers transformers from 50 kVA to 2 500 kVA intended for operation in three-phase distribution networks, for indoor or outdoor continuous service, 50 Hz, immersed in mineral oil, natural cooling, with two windings: - a primary (high-voltage) winding with a highest voltage for equipment from 3,6 kV to 36 kV; - a secondary (low-voltage) winding with a highest voltage for equipment not exceeding 1,1 kV. NOTE 1 This document may be applied, either as a whole or in part, to transformers immersed in a synthetic insulating liquid. NOTE 2 This document may be applied, either as whole or in part, to transformers having windings with more than one rated voltage. In this case the rated power for each rated voltage shall be specified by the purchaser. The object of this document is to lay down requirements related to electrical characteristics and design of three phases distribution transformers immersed in mineral oil.


Current Stage code 6060
Current Stage code date 2012-01-20
Current Stage code deadline 2012-10-31
Deadline date for vote 2012-04-12


Order Voucher  


IEC Technical Body IEC/TC 14
Reference Document  
ICS 29.180 - Transformers. Reactors
Keywords Transformer; Distribution transformer; Oil; 3 phase
Note Publication editing allocated to * Will be superseded by future prEN 50588-1 (PR=24468)
Special National Condition(s)  


Categories - Aspects
Product Life Cycle


Deadline Date
6060 2012-01-20 2012-10-31 export to doc file  EN  DE
5099 2011-10-31 2011-11-28  
5060 2011-09-26 2011-10-17 export to doc file  EN
5020 2011-04-22 2011-09-23 export to doc file  EN  FR  DE
4099 2011-03-19 2011-04-01  
1099 2010-03-01 2010-07-31  
1000 2009-10-05 2010-02-28  

Implementation Dates

date of Ratification (DOR) (1) 2011-10-31
date of Availability (DAV) (2) 2012-01-20
date of Announcement (DOA) (3) 2012-04-30
date of Publication (DOP) (4) 2012-10-31
date of Withdrawal (DOW) (5) 2014-10-31


Superseded by FprEN 50588-1:201X
Normative reference (6)  

(1) Date of ratification (dor) date when the Technical Board notes the approval of an EN (and HD for CENELEC), from which time the standard may be said to be approved

(2) Date of availability (dav) date when the definitive text in the official language versions of an approved CEN/CENELEC publication is distributed by the Central Secretariat

(3) Date of announcement (doa) latest date by which the existence of an EN (and HD for CENELEC), a TS or a CWA has to be announced at national level

(4) Date of publication (dop) latest date by which an EN has to be implemented at national level by publication of an identical national standard or by endorsement

(5) Date of withdrawal (dow) latest date by which national standards conflicting with an EN (and HD for CENELEC) have to be withdrawn

(6) This list of normative references is purely indicative. The only official list of normative reference is the list of the published standard.