The Transformer Oil BDV (Breakdown Voltage) Tester is a crucial instrument used to measure the breakdown voltage of transformer oil, which is a key indicator of the oil's insulating properties. Transformer oil plays a vital role in the electrical insulation and cooling of transformers, and ensuring its quality is essential for maintaining transformer performance and preventing failures. The BDV test is one of the most reliable methods for assessing the insulating strength of transformer oil.Transformer oil’s primary function is to act as an electrical insulator and coolant. Over time, the oil can degrade due to factors like temperature, moisture, and contamination. The BDV test is one of the most effective ways to assess whether the oil is still capable of providing adequate insulation for the transformer.

A low BDV reading indicates that the transformer oil is contaminated or degraded, which could lead to transformer failure or a reduction in its operational lifespan. Regular BDV testing allows for timely intervention—such as oil filtration, replacement, or treatment—to restore the oil's insulating properties and maintain the transformer’s performance.

Working Principle

The Transformer Oil BDV Tester works by applying a controlled high voltage to a sample of transformer oil placed between two electrodes. The voltage is gradually increased until the oil breaks down and allows electrical conduction, resulting in a sudden discharge. The voltage level at which this breakdown occurs is recorded as the oil's breakdown voltage (BDV).

The higher the BDV, the better the insulating properties of the oil. Transformer oil with a low BDV value may indicate the presence of contaminants such as water, acids, or particles, which can reduce its insulating efficiency and potentially lead to transformer failure.