During a dielectric absorption test, how should insulation in good working condition behave?

During a dielectric absorption test, insulation in good working condition is expected to exhibit an increase in resistance. This behavior indicates that the insulation material is effectively insulating and has not deteriorated, suggesting it can maintain its ideal electrical properties.

The dielectric absorption test involves charging a capacitor and measuring the insulation resistance over time. Initially, the resistance may be lower due to the dielectric material absorbing some of the applied voltage. However, as the dielectric stabilizes, the resistance should increase, demonstrating that the insulation is capable of resisting electrical leakage effectively.

If insulation remains constant, decreases, or fluctuates, it may indicate potential issues such as moisture ingress, material breakdown, or operational aging, which compromise the effectiveness of the insulation. Therefore, an increase in resistance during this test confirms that the insulation is in good condition and functioning properly.