For extended life and optimal performance, maintenance activities of your dry-type transformer are highly recommended on a periodic basis.

The transformer inspection checklist below covers important checkpoints for routine dry-type transformer maintenance; however, be sure to check your product-specific maintenance guidelines to make sure there aren’t additional details specific to your particular transformer. The frequency of periodic transformer maintenance inspections will vary depending on the operating environment, as well as the type of load being applied.

Checking for Dust Accumulation

  1. Visually inspect cover louvers, screens, and internal coil cooling ducts for dust build-up. If found, wait until the transformer is de-energized to remove any panels
  2. Once de-energized, vacuum out as much of the dust as possible
  3. Clean the transformer with a brush or lint-free rag. Avoid detergents or cleaning products as they may accumulate future dust and accelerate the deterioration of your transformer
  4. In inaccessible areas, blow dry air into the unit

Allowing dust and debris to accumulate over time can cause problems with your dry-type transformers that can lead to an electrical short and overheating.

While the Transformer is Energized

  1. Verify proper ventilation
  2. Monitor any changes in the characteristics of your transformer’s audible sound

While the Transformer is Deenergized

  1. Ensure all accessible hardware is tightened
  2. Clean cooling fans
  3. Inspect insulation surfaces for any discoloration or signs of heat damage
  4. Isolation dampeners should be monitored for signs of deterioration

While liquid-filled transformers are monitored based on indicating gauges, dry-type transformer maintenance consists mostly of subjective observations. Regardless of how often you’re doing maintenance on your units, issues can arise at any time. Be sure to be observant of your dry transformer’s appearance and operation. If you notice anything out of the ordinary, it’s vital that you attend to the issue immediately to avoid damage.

If you have questions about the maintenance of your dry-type transformer in optimal working condition with transformer servicing or need assistance when something goes wrong, please contact an experienced NAPCES representative.