Which gauge should be monitored on oil sample reports to check for moisture in paper insulation?

Monitoring moisture in paper insulation is crucial for assessing the condition of electrical equipment, particularly transformers. The correct choice involves understanding the relationship between the liquid temperature of the insulating oil and the ability of the paper insulation to absorb moisture.

In electrical equipment, moisture content in paper insulation typically increases with the temperature of the insulating liquid. As the liquid temperature rises, the solubility of water in the oil also increases, which can lead to higher moisture levels in the paper insulation. Therefore, tracking the liquid temperature provides essential information about the potential for moisture accumulation. By monitoring this gauge, operators can take proactive measures to manage moisture levels, thereby enhancing the longevity and reliability of the equipment.

This choice aligns with industry standards for evaluating insulating oil conditions and allows for better maintenance strategies to avoid failures caused by overloaded or compromised paper insulation.