What is the maximum acceptable neutralization number for a 35kV power transformer filled with FR3 insulating liquid?

For a 35kV power transformer filled with FR3 insulating liquid, the maximum acceptable neutralization number is 0.03 mg KOH/g. This value is critical to maintaining the chemical integrity and performance of the insulating liquid.

The neutralization number, also known as the acid number, quantifies the amount of acid present in the insulating liquid. A lower neutralization number indicates a better-quality insulating fluid with minimal acid content, which helps prevent degradation of the insulation material over time. Maintaining the neutralization number at or below 0.03 mg KOH/g ensures that the FR3 fluid remains effective at insulating and mitigating the risks related to electrical breakdown and chemical damage.

Higher values of the neutralization number suggest an increase in acidity, which can lead to deterioration of the transformer components and ultimately compromise its operational efficiency and lifespan. Focusing on this maximum limit is essential for the safe and optimal functioning of the transformer, thereby supporting reliability in electrical supply systems.