A review of methods for measuring oil moisture

The machinery equipment and power transformers are respectively equipped with lubricating oil and transformer oil to ensure long-term stability and safety. However, lubricating oil with water has a fast-aging rate and numerous acidic products, which cause pitting corrosion and cracks. Transformer oil mixed with water can cause insulation breakdown and equipment combustion. Accurate and real-time detection of oil moisture is critical to preventing damage to equipment and prolonging its service life. In recent years, numerous research has been conducted on the detection methods of oil moisture, but there are few review articles. This paper reviews the development of oil moisture detection methods in terms of principles, manufacture, and commercialized products, aiming to provide ideas for the development of online oil moisture detection. It is expected to provide some insight and guidance for those who will set foot in the industry to understand the industry's development and grasp the detection principles.