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Online en offline tests

Online en offline deelontladingsmetingen op transformatoren zijn geavanceerde analysemethoden om meer informatie te krijgen over de levenscyclustoestand van het isolatiesysteem. Testen na het in gebruik nemen van een nieuwe transformator zijn handig om transportschade of montagefouten te detecteren.

Online en offline tests

Testing power or distribution in the field is a demanding task for service engineers or commissioning teams today. Such tests can be done online, means the transformer is energized and connected to the grid or offline, means it is powered by a mobile power system. Both methods do have advantages and disadvantages as listed below:


Online testing:

+ Transformer is under load condition (full current)

+ Rated voltage and frequency

- No variable voltage and frequency

- Mostly no access to the transformer tank

- difficult for fault investigations

- PDIV and PDEV cannot be distinguished

 

Offline testing:

+ Full variable voltage and switchable frequencies