Frequently Asked Questions
(FAQs)

What is partial discharge (PD), and why is it important in solid insulation materials?

PD is a localised electrical discharge that only partially bridges the insulation between conductors. It is critical in solid insulation materials because PD activity can degrade the material over time, leading to insulation failure. Monitoring PD helps identify potential issues early, ensuring the reliability of high-voltage systems.

 Can partial discharge (PD) occur in solid insulation materials, and how is it detected?

Yes, PD can occur in solid insulation materials, especially in areas with voids, cracks, or impurities. It is detected using specialised equipment such as partial discharge detectors, which measure the electrical signals or acoustic emissions generated during PD activity. Regular monitoring helps maintain the health of insulation systems.

 Does increasing the area of insulation affect the breakdown voltage?

Breakdown voltage is not directly proportional to the area of insulation. In fact, increasing the area can sometimes lower the breakdown voltage because a larger surface area is more likely to contain imperfections or weak points. Imperfections can concentrate electrical stress, making the insulation more susceptible to failure under high voltage conditions.

 How does temperature affect the breakdown voltage of solid insulation materials?

Temperature significantly impacts the breakdown voltage of solid insulation materials. Higher temperatures can decrease the structure of the insulation material, reducing its dielectric strength and breakdown voltage. This makes temperature a critical factor in ensuring the reliability of electrical insulation.

 What is the relationship between insulation thickness and breakdown voltage?

Breakdown voltage usually increases with insulation thickness, but the relationship is not perfectly linear. As thickness increases, other factors such as material imperfections or external stresses can influence the breakdown voltage. Optimising thickness is essential to balance insulation performance and practicality.

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