Right from the Start: Best Practices for Transformer Testing & Inspection Upon Arrival

By Shane Smith

Actions taken (or neglected) in the first hours after a transformer's delivery can have long-term consequences. Taking the right steps initially can pay off in the long run through reductions in maintenance costs and downtime. 

 

Receiving a new transformer is a familiar event in this industry. However, it is important to remember that decisions made immediately upon a new unit's arrival can affect costs and labor for years to come. Taking the right steps initially can pay off in the long run through reductions in maintenance costs and downtime.

Here are some best practices to observe as soon as the new transformer arrives.

A Thorough "Once-Over"

First, did the transformer truly arrive safely? If the unit shipped with an impact recorder, check to ensure that it had a smooth trip. Impacts on any axis of 4 Gs or greater may indicate rough handling that could potentially have caused damage to the transformer.

Otherwise, inspect closely for any signs of damage that may have occurred during transit. Scuffs, dents, and scrapes in the paint are obvious clues, but take a careful look at all of the following:

• * Tie rods or chains used to secure unit to trailer or rail car
• * Tank pressure level
• * Signs of leaks on the main tank (for units shipped with oil) and bushings
• * Attached fittings, conduits, cabinets, boxes, terminals, gauges, valves and switches
• * Condition of all accessories, such as radiators, fans, bushings, etc. (Loose condenser bushings can also undergo power factor testing upon receipt outside the transformer, provided they are properly configured with test taps, and are upright and stabilized.

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This article was originally published in the October 2019 issue of the Best Practices: Transformer Testing, Maintenance and Monitoring magazine.

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