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.

IEC 61181 Ed. 1.0

IEC 61181 Ed. 2.1

OVE/ONORM EN 61181:2008 - Identical

NEN EN IEC 61181:2007 - Identical

ONORM OVE EN 61181:1993 - Identical

NF EN 61181:2007 - Identical

NEN 11181:1993 - Identical

CEI EN 61181:2008 - Identical

SS EN 60118-1:1996 - Identical

I.S. EN 61181:2007 - Identical

UNE EN 61181:2008 - Identical

CEI EN 61181 Ed. 2 (2007) - Identical

UNE EN 61181:1996 - Identical

DIN EN 61181 (2007-12) - Identical

SN EN 61181:1993 - Identical

VDE 0370-13:2007 - Identical

BS EN 61181:2007+A1:2012 - Identical

PN EN 61181:2007 - Identical

IEC 61181 Amd.1 Ed. 2.0 -