山田 翔太

The significance of transformer oil colour in power transformers lies in its ability to indicate the condition of the oil and the transformer itself. A clear or light yellow colour typically signifies good quality oil, while darker shades may indicate contamination or degradation. Changes in transformer oil colour can signal the presence of moisture, oxidation, or other issues, prompting maintenance or further analysis to ensure the reliability and safety of the power transformer.

Kunlun 25 transformer oil is characterized by its excellent dielectric strength, thermal stability, and low viscosity, making it suitable for use in power transformers. Its properties include high flash point and low pour point, which enhance safety and performance under varying temperatures. The applications of Kunlun 25 transformer oil in power transformers include insulation, cooling, and protection of electrical components, ensuring efficient operation and longevity of the transformers.

The density test of transformer oil is a procedure used to measure the mass per unit volume of the oil. This test is crucial for assessing the quality and suitability of transformer oil for electrical insulation and cooling. A higher density may indicate contamination or degradation, while a lower density can suggest the presence of lighter hydrocarbons. Accurate density measurements help ensure the reliable operation of power transformers.

Oil in transformers provides fire protection through its high flash point and insulating properties. Transformer oil acts as a coolant, dissipating heat generated during operation, which reduces the risk of overheating and potential ignition. Additionally, the oil forms a barrier that can help suppress flames in the event of a fault, thereby enhancing the overall fire safety of the transformer system. Proper maintenance of oil quality is crucial for effective fire protection.

Oil test equipment is made by several well known electrical test and diagnostic instrument manufacturers, including companies producing BDV testers, moisture meters, and dissolved gas analyzers. Selection should be based on the test standard support (IEC or ASTM), accuracy, repeatability, calibration traceability, and field ruggedness. For DGA, consider lab services versus portable analyzers, and validate results against a certified lab periodically to keep confidence in decisions.

An acidity test kit measures the neutralization number of transformer oil, indicating oxidation and aging. The oil sample reacts with a chemical reagent, and the result shows the amount of acidic compounds present. Increasing acidity signals insulation degradation, sludge formation risk, and the need for oil treatment or replacement.

IEC 60156 is the primary standard governing breakdown voltage testing of insulating oils. It defines electrode geometry, gap spacing, voltage rise rate, and test procedure to ensure consistent and repeatable results. BDV testing is also referenced in IEC 60296 for unused oil quality and IEC 60422 for oil in service. Utilities rely on these standards for acceptance and condition assessment.

Oil volume is determined from manufacturer data such as drawings, filling charts, and nameplate documentation, because tank geometry and radiators vary widely. During filling or draining, volume can be measured using calibrated flow meters, weigh scales, or tank level versus volume curves. For conservator units, separate volumes exist for main tank, radiators, and conservator. Accurate volume determination matters for purchasing oil, sizing containment, planning transport weight, and ensuring the expansion space and nitrogen blanket or breather system function correctly.