Several factors can affect the dielectric strength of transformer oil, including the presence of contaminants such as water and particulate matter, which can significantly reduce its insulating properties. The temperature of the oil also plays a critical role, as elevated temperatures can lower the dielectric strength. The chemical composition and age of the oil are important too; aging can lead to the formation of acids and sludge that degrade the oil’s performance. Additionally, the presence of bubbles or dissolved gases in the oil can compromise its dielectric strength. Regular tests using Globecore devices to check for dielectric strength and water content in transformer oil are essential to ensure optimal performance and reliability.

The BDV (Breakdown Voltage) test and the Hi-Pot (High Potential) test serve different purposes in evaluating industrial oils. The BDV test primarily measures the dielectric strength of insulating oils, indicating their ability to withstand electrical stress before breakdown occurs, which is crucial for maintaining electrical equipment reliability. Conversely, the Hi-Pot test assesses the insulation quality of electrical apparatus by applying a high-voltage supply to identify potential insulation failures or breakdowns, ensuring safety and performance in operational environments. While both tests involve high voltage, the BDV test focuses on the oil itself and its electrical properties, whereas the Hi-Pot test evaluates the overall insulation system of equipment.