What are the main types of transformer oil tests and their purposes?

The main types of transformer oil tests include dielectric strength testing, which assesses the oil’s insulating properties; moisture content analysis, which determines the water content that can affect performance; and dissolved gas analysis (DGA), which identifies gases produced by insulation breakdown. Additionally, acidity tests measure the oil’s degradation level, while flash point tests evaluate fire risk. Each test is crucial for ensuring the reliability and longevity of power transformers.