Where do power transformers and reactors need to be stored?

Power transformers and reactors may need to be stored to accommodate constraints in manufacturing, transport, or installation. This storage may take place at the factory, the installation site, or alternative storage facilities. In some cases, transformers and...

How should a transformer be stored?

The transformer or reactor must be stored in a suitable liquid containment area. For long-term storage, according to the second option, it is also necessary to consider how the components will be stored. This is especially important for components that may become contaminated or deteriorate if not stored correctly, e.g., bushings and coolers.

Should a transformer be stored in a CIGRE manual?

CIGRE working group A2.34 gave some guidance on storage of spare components and materials, but not complete transformers (CIGRE brochure 445 2011 ). They also recommended that the operation and maintenance manual for transformers should include storage instructions.

Should a transformer be fully assembled during storage?

There are advantages to fully assembling the transformer or reactor during storage for a spare in long-term storage. Firstly, it preserves the condition of components which might otherwise become contaminated or deteriorate if stored separately, e.g., bushings and coolers.

How long can a liquid-immersed transformer be stored?

There are essentially three options for storing liquid-immersed transformers and reactors: The first option is suitable for short-term storage to accommodate constraints in manufacturing, transport, or installation. This option can typically be used for up to 6 months following dismantling for transport after testing.

How do you preserve a transformer cooler?

The condition of the coolers can thus best be preserved by assembly onto the transformer and then filling with liquid. If this is not possible, then all cooler components should be filled with dry gas and securely blanked during transport and storage.