What factors can affect the interrupting rating of oil?

The interrupting rating of oil, which indicates the ability of the oil to withstand and extinguish electrical arcs, is influenced by various factors. Among these, humidity, moisture, and acid are particularly significant.

Humidity affects the electrical properties of oil; higher moisture content can decrease the dielectric strength, making it less effective at interrupting electrical faults. Water in the oil can lead to breakdown and reduce the effectiveness of the oil in dissipating heat and absorbing electrical energy during a fault condition.

Acid levels in oil can also play a crucial role. The presence of acids, which can result from contamination or degradation of the oil, may lead to corrosive reactions that deteriorate its insulating properties and, consequently, its interrupting rating.

While pressure, temperature, elevation, and chemical composition are relevant in various contexts, they do not specifically encapsulate the most critical factors that would directly influence the interrupting rating in relation to moisture and acidity. Thus, focusing on humidity, moisture, and acid reveals the most pertinent aspects affecting oil's performance in interrupting circuits.