What are the requirements when retrofilling transformers with Midel fluids?
There are four main steps to follow to retrofill transformers with ester fluids, as follows:
1. Set up retrofilling plant
Follow site procedures
Ensure transformer is fully de-energised and grounded
Perform site inspection and complete safety handover
2. Reduce mineral oil content as much as possible
Connect pumps and hoses
Ensure all pumps, lines and hoses are bonded and earthed
Pump the mineral oil from the transformer to the waste container
Rinse core and windings with heated ester fluid
Allow time for the tank to fully drain
3. Fill again using new ester fluid
User heated fluid
Use dedicated hoses and pumps to prevent contamination
4. Test and nameplate
Perform safety inspection and complete handover
Take fluid sample to carry out appropriate testing
Attached MIDEL nameplate as confirmation that the transformer has been retrofilled.
The video below goes through the process and benefits of retrofilling with Midel ester fluids.
For more detailed information on retrofilling with Midel ester fluids, visit our dedicated Retrofilling page, which has information on the reasons for retrofilling, case studies and supporting technical documents.
More questions on ester fluids?
This post is one of the 15 top questions we get asked on retrofilling transformers with ester fluids. Here is the full list of the frequently asked questions on ester fluid retrofilling: