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



Reference EN 61181:2007
Title Mineral oil-filled electrical equipment - Application of dissolved gas analysis (DGA) to factory tests on electrical equipment
Project Number 16923
Abstract/Scope Specifies oil-sampling procedures, analysis requirements and procedures, and recommends sensitivity, repeatability and accuracy criteria for the application of dissolved gas analysis (DGA) to factory testing of new power transformers, reactors and instrument transformers filled with mineral insulating oil when DGA testing has been specified. The most effective and useful application of DGA techniques to factory testing is during the performance of long-term tests, typically temperature-rise (heat run) and overloading tests on power transformers and reactors, also impulse tests on instrument transformers. DGA may also be valuable for over-excitation tests run over an extended period of time. Experience with DGA results, before and after short-time dielectric tests, indicates that DGA is normally less sensitive than electrical and acoustic methods for detecting partial discharges. However, DGA will indicate when these partial discharges become harmful to the insulation and may be detected by inspection [2]. This edition includes the following significant technical changes with respect to the previous edition: a) the specific procedures used during factory tests (sampling location, sampling frequency, gas extraction and chromatographic analysis in the laboratory) are described in more detail; b) information is provided in Annex A concerning the residual gas contents recommended before thermal tests on power transformers, typical gas values observed during the tests and cases where gas formation during the tests was followed by problems in the transformers; c) typical values observed during chopped lightning-impulse tests on instrument transformers are indicated in Annex B.


Current Stage code 6060
Current Stage code date 2007-04-05
Current Stage code deadline 2007-12-01
Deadline date for vote  


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IEC Technical Body IEC/TC 10
Reference Document IEC 61181:2007 (EQV)
ICS 29.040.10 - Insulating oils
29.180 - Transformers. Reactors
Keywords Insulating material; Impregnated; Gas; Dissolved gas analysis (DGA); Factory
Note Supersedes EN 61181:1993 * Issued by CLC/BTTF 116-1 converted into CLC/TC 10 (D145/093)
Special National Condition(s)  


Categories - Aspects
Product Life Cycle
3 Resource use - Oil Recovery, Disposal B2B, B2C
4.7 Waste Disposal B2B, B2C


Deadline Date
6060 2007-04-05 2007-12-01 export to doc file  EN  FR  DE
5099 2007-03-01 2007-05-01  
5060 2007-01-23 2007-02-05 export to doc file  EN
5020 2006-11-17 2007-01-19  
4099 2006-05-19 2006-06-16  
4020 2005-07-08 2005-12-09  
3099 2005-07-05 2005-07-08  

Implementation Dates

date of Ratification (DOR) (1) 2007-03-01
date of Availability (DAV) (2) 2007-04-05
date of Announcement (DOA) (3) 2007-06-01
date of Publication (DOP) (4) 2007-12-01
date of Withdrawal (DOW) (5) 2010-03-01


Supersedes EN 61181:1993
Superseded by  
Normative reference (6) EN 60567:2005

(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.