Transformer Maintenance Tips to Enhance Lifespan and Performance
The importance of transformers within a power infrastructure cannot be overstated; they are the single most expensive asset within the entire system. A failed transformer can result in millions of dollars spent on new equipment and extended periods of downtime. All too often, organizations experience sudden transformer outages without the benefit of preventative maintenance.
Those situations may very well have been avoided had the organization performed scheduled transformer maintenance and diagnostic checks. Most times, the early warning signs are overlooked until they culminate in catastrophic transformer failure. Organizations that perform inadequate transformer maintenance experience decreased operational capacity and decreased operational continuation of their transformers.
To solve these problems, all organizations need to implement a systematic preventative maintenance programme. Regular transformer inspection allows organizations to identify potential transformer problems before they develop into major issues. A professionally performed transformer service will increase the operational efficiency of an organization’s transformer for decades.
Understanding Transformer Maintenance Basics
Maintenance for transformers is not just limited to cleaning; it requires ongoing monitoring of electrical and mechanical aspects of the transformer to determine how well it is operating. Temperature readings can provide valuable information about the internal health of the transformer.
Because most transformer manufacturers have developed historical operating parameters, they should provide guidelines for what future maintenance is going to be. If a high-load transformer is operating, it will require more maintenance than a transformer that is operating at a lower load.
Documenting all inspections and repairs will help support an effective maintenance program. By keeping good-quality documents, a user is able to gather data about how well the transformer has been maintained over time as well as track performance trends, which would assist in determining the best time to replace or upgrade a transformer.
Critical Inspection Points
The Inspect Transformer process includes inspections of various components of the transformer using a systematic approach. Visually inspect the body for corrosion and oil leaks, check for cracks and tracking marks in bushings, and look for evidence of thermal overload at all electrical connections.
It is important to regularly check the oil levels, as low oil can cause transformer failure through overheating or insulation failure. Inspect for silica gel saturation in breathers and replace the silica gel when its color changes, as color indication is the key to maintaining an adequate level of moisture within the transformer tank.
When performing inspection duties, special attention needs to be given to cooling systems. Ensure that all radiator fins are kept clean at all times to obtain maximum heat dissipation capability from the radiator. Check all cooling fans for proper operation and that they are not making any strange noises.
Oil Analysis and Testing
Transformer oils not only provide insulation, but also help to cool down transformers. Oil testing is an essential part of a transformer maintenance program. Dissolved gas analysis (DGA) helps to detect transformer problems early. This test determines how much gas has been produced inside the transformer from electrical and thermal stress.
Dielectric strength testing of oils measures an oil's ability to insulate. Degraded oils allow for greater breakdowns and failures within transformers. Moisture content tests are also important. High moisture levels decrease the effectiveness of the insulation.
Contaminated transformer oils are more likely to fail due to decreased dielectric strength. Increased levels of acidity cause an increase in the rate of deterioration of the paper insulation. By determining contamination levels through particle counting tests, you can determine the source of contamination.
Preventive Maintenance Strategies
Thermal Imaging or Thermographic scanning provides many predictive capabilities. Using infrared cameras, potential problem areas can be detected before failure. Scheduling thermal imaging should be done based on peak loading conditions or hours. It will allow for easy identification of loose connections and excess current on overloaded components without causing any physical disruption.
Partial Discharge Testing identifies weakness in transformer insulation; therefore, by testing for corona activity on the transformer, early discovery can minimize the risk of major failures from minor problems. In addition, incorporating online monitoring systems provides continual evaluation of your transformer health.
Conclusion
Investing in effective transformer maintenance can provide long-term returns on your investment. Preventive maintenance helps to minimize unexpected failures while extending the life of the equipment. Preventive maintenance programs help to identify repairs that need to be made before they become extensive and costly to fix.
Professional transformer inspection and service programs provide measurable benefits by providing a higher level of reliability and reducing long-term operating costs for your transformers. If a transformer is cared for by an experienced technician, it can provide many years of dependable performance.
Take steps to protect your investment in power infrastructure today. Contact the professionals at Makpower Transformer for a complete transformer maintenance solution. Our proven transformer service programs keep your transformers operating efficiently. Schedule your preventative maintenance inspection today to avoid costly, unexpected failures.
