Video Summary

**Electrical Properties of Polymers** Polymers are long chain giant organic molecules assembled from many smaller molecules called monomers. They are used in a wide variety of applications, including electrical appliances. The electrical properties of polymers depend on their chemical structure, molecular weight, and morphology. Polymers with high dielectric constants are used for applications such as film capacitors and artificial muscles, while those with low dielectric constants are used in the field of capacitors and dielectric materials. The size and distribution of voids in polymers are very important in the performance of polymers. Internal and corona partial discharges are the most common defects that affect the polymeric insulation used for high voltage insulation systems. Aging in the polymer insulation systems is caused by thermal, environmental, electrical, and mechanical stresses. Thermal stress is caused by the presence of non-uniform fields in polymeric insulation. Environmental stress is caused by sunlight, gamma rays, x-rays, salt and dust contamination, acid rainfall, and pressure. Mechanical stress is caused by compression, tension, bending, vibration, and impact. Partial discharges in polymeric insulation underground cables are caused by voids. It is necessary to understand possible internal PD activity over time in order to assess whether different wired PD patterns vary in uniqueness and characteristics. This is important to understand different void degradation characteristics and how they affect the lifetime of hlv apparatus.