Transformers are an integral part of the power supply and distribution system, and it is particularly important to maintain them accordingly in order to ensure the uninterrupted supply of power projects. Dry-type transformers, in particular, are generally used in industrial and operational environments due to the many advantages they offer, such as improved reliability and high efficiency, reduced fire and reduced maintenance costs.

However, like all electrical equipment, dry-type transformers are regularly inspected and sometimes overhauled to ensure condition and service life. In this article, we are going to look at routine maintenance and servicing of dry-type transformers, covering both difficult issues and good practices.

Dry-type transformer routine maintenance.

Maintenance is particularly important to ensure the safe operation of dry-type transformers. Below are some basic maintenance methods for dry-type transformers.

Inspection: Human eye inspection of the transformer is very necessary to detect all hardware failures, such as gaps, corrosion leaks. Check the transformer shell, refrigeration system and electrical connection grounding to ensure that everything is in good operating condition.

CLEANING: Regularly clean the interior of the transformer and the heat sink to prevent dust and debris from accumulating and jeopardizing the cooling performance of the transformer. A soft brush or compressed gas should be used to eliminate any stains or debris.

Testing: Regularly carry out electrical tests, including earth resistance and power factor tests, to detect any anomalies that may indicate potential problems.

Oil sampling: If the transformer has an oil core, regular oil sampling and analysis is particularly important to check for any contaminants (water-like or metallic) that may indicate internal structural damage or wear. Should be carried out once a year oil sampling, and the results of previous years with the data for comparison, in order to determine whether there is a fundamental change.