Transformer testing services are vital for ensuring the safety, reliability, and longevity of electrical transformers. A popular service provider will offer a comprehensive suite of tests to accurately assess a transformer's condition. These tests often include winding resistance tests to check for loose connections, insulation resistance tests to detect moisture or contamination, and a transformer turns ratio (TTR) test to verify the correct voltage transformation. Many top-tier service providers also offer transformer oil analysis, including Dissolved Gas Analysis (DGA), which can detect internal faults like overheating or arcing by analyzing the gases present in the oil. Another advanced and popular test is Sweep Frequency Response Analysis (SFRA), which helps identify mechanical damage or winding deformation. By offering a full range of diagnostic and preventive tests, popular service providers help clients proactively manage their assets, prevent catastrophic failures, and extend the operational life of their transformers.