New Laboratory Methodologies for Investigating of Insulating Liquids - Further Developments in Key Functional Properties

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…