New Laboratory Methodologies for Investigating of Insulating Liquids

Tue, Jan 27, 2026 1:00 PM - 2:30 PM CET

The contribution describes part of the Cigre work of the WG D1.70 on new laboratory methods for the investigation of insulating liquids. Experimental investigations included:

• development of a method for stray gassing behaviour of insulating liquids independent of their constitution with examples from service manifestating the correlation of observed service behaviour and laboratory tests
• the implementation of natural and synthetic esters as insulating liquids requires their maintenance and correspondingly the monitoring of the inhibitor content The achieved results clarify some additional functional requirements for insulating liquids.
• laboratory procedures and their measuring uncertainty for identifying of environmentally hazardeous compounds in insulating liquids like polycyclic aromatics and polycyclic aromatic hydrocarbons. For the identification of individual EPA restricted PAH marker compounds methods like EN 16143 are necessary.
• the determination of oxidation stability in service oils is not covered by the international standardisation. Measuring the inhibitor in insulating oils with time allows a correlation to further ageing parameters, as well as a prediction of life span of the insulating liquid.

This webinar is presented by Ivanka Hoehlein, convener of CIGRE Working Group SC D1, "New Laboratory Methodologies for Investigating of Insulating Liquids - Further Developments in Key Functional Properties", that published Technical Brochure Ref 927 (available from www.e-cigre.org), 2024. The registration to this webinar is free for all, CIGRE members and non-members. Technical Brochures can be downloaded for free by CIGRE members. If you are not a CIGRE member, join us on https://www.cigre.org/GB/join/how-to-join.

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