IEC 60666 DETECTION AND DETERMINATION OF SPECIFIED ADDITIVES IN MINERAL INSULATING OILS
1 Scope
The methods described in this International Standard concern the detection and determination of specified additives in unused and used mineral insulating oils.

The detection methods may be applied to assess whether or not a mineral insulating oil contains an additive as specified by the supplier.

The determination methods are used for the quantitative determination of additives known to be present or previously detected by the appropriate detection method.

2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

IEC 60296, Fluids for electrotechnical applications - Unused mineral insulating oils for transformers and switchgear

IEC 60475, Method of sampling liquid dielectrics

ISO 5725 (all parts), Accuracy (trueness and precision) of measurement methods and results