IEC 60475 METHOD OF SAMPLING INSULATING LIQUIDS
This International Standard is applicable to the procedure to be used for insulating liquids in delivery containers and in electrical equipment such as power and instrument transformers, reactors, bushings, oil-filled cables, oil-filled tank-type capacitors, switchgear and load tap changers (LTCs).
This standard applies to liquids the viscosity of which at the sampling temperature is less than 1500 mm2/s (or cSt). It applies to mineral oils and non-mineral oils (such as synthetic esters, natural esters, vegetable oils or silicones).
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60567:2011, Oil-filled electrical equipment - Sampling of gases and analysis of free and dissolved gases - Guidance
IEC 60970, Insulating liquids - Methods for counting and sizing particles
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 delivery containers
containers such as drums, rail tankers, road tankers or flexible plastic bags used to store, transport and deliver batches of oil
3.2 electrical equipment
equipment filled with insulating oil such as power and instrument transformers, reactors, bushings, oil-filled cables, oil-filled tank-type capacitors, switchgear and load tap changers (LTCs)
3.3 sampling equipment
equipment used for sampling oil from delivery containers (e.g. sampling probes, such as dippers or siphons) and from electrical equipment (e.g. connecting tubing and drain valve adapters)
NOTE This also includes sample containers, waste oil containers and other accessories.
3.4 sample containers
containers such as syringes, bottles, ampoules or other devices used to store and transport samples of oil for analysis
NOTE This includes accessories such as valves, tubing or caps attached to the container.