How to reduce transformer failure

In the past 35 years, our team has investigated thousands of transformer failures. There are many reasons why a transformer may fail, but there are some common reasons. We have identified 10 common causes that can help you determine whether a failure should occur. Below we focus on the causes of transformer failures, and put forward some suggestions and conclusions to help achieve the longest service life.

10 common causes of transformer failure

Specification does not apply to application
Light surge
Line surge
Short circuit
Poor construction
Insulation deterioration
overload
moisture
Insufficient maintenance
damage
Loose connection

How to reduce transformer failure

First, it is crucial to ensure that the transformer is designed and manufactured for its intended application. Transformers suitable for the purpose of well construction should not fail. Unless there are problems outside the design specifications, the life expectancy of the transformer is very long.

Second, it is very important to keep the electrical load within the design range during the entire life cycle of the transformer. If the application needs to be changed, a comprehensive technical analysis will be carried out in advance.

Third, planned maintenance, inspection and testing will greatly reduce the number of transformer failures. This plays an important role in larger oil-filled transformers.

Transformer failure-what to do next?
When a transformer fails, two costs need to be considered: the cost of shutdown and the cost of rewinding the transformer. In addition, due to longer downtimes, large transformers may take months to manufacture.

If the transformer fails, it is important to have a qualified engineer test and inspect it. This may not always be possible on-site. This will require the transformer to be removed from the site for testing.