What electrical principle is primarily affected by temperature in insulating systems?

The principle that is primarily affected by temperature in insulating systems is insulation resistance. As temperature increases, the resistance of insulation materials typically decreases due to increased molecular movement, leading to greater leakage currents. This is particularly critical in electrical systems, as lower insulation resistance can result in reduced effectiveness in preventing unwanted leakage currents, which can cause short circuits and increase the risk of electrical failures or hazards.

Understanding how temperature influences insulation resistance is crucial for maintaining the integrity and safety of electrical systems. In practice, this means that regular testing and monitoring of insulation resistance at various temperatures should be conducted to ensure that the insulation continues to perform effectively under different operating conditions.

Other aspects like electrical current, voltage level, and phase angle do have some relation to temperature variations, but these are not as directly affected by changes in insulation properties as insulation resistance is.