Progress in and prospects for electrical insulating materials

Abstract

The performance of electrical equipment and devices is determined to a great extent by the properties of their insulating materials. In power systems and electrical devices, insulating materials have to work in extreme circumstances that can include high temperature differences, intense radiation, and strong electric fields. Such conditions demand highquality insulating materials with superior electrical, thermal, and mechanical properties as well as resilience to other environmental stresses. This study focuses on advances in insulating materials since the early 20th century and reviews the many developments in their properties and applications, including electric breakdown strength, thermal conductivity, temperature resistance, corona resistance, and specific energy storage in dielectrics. Some research progress on other properties is also covered, such as non-linearity and radiation resistance. Investigations into the properties of insulating materials can greatly assist in understanding their interface effects and composite structures, which in turn is helpful for discovering methods to improve the performance of electrical devices. Future directions for research are proposed to guide new investigations and support the development of even better insulating materials. High Voltage

The search for enhanced dielectric strength of polymer‐based dielectrics: A focused review on polymer nanocomposites

“…[ 82,83 ] Although insulating materials with high corona resistance and tracking resistance were also developed, demonstrating the pronounced effect of nano Al 2 O 3 and TiO 2 , yet, their improvement is not as effective as micron‐sized mica and progress in this subject remains slow. [ 84 ] Partial discharge can generate high energy electrons, ultraviolet rays, local high temperature, and active ions. The nanofillers tend to resist the high energy damage and thus increase the discharge resistance performance of the dielectric.…”

Nanocelluloses and Related Materials Applicable in Thermal Management of Electronic Devices: A Review

“…The effectiveness of a heat spreading material is related to its thermal conductivity [4]. Thus, the key point of the thermal management is to use electrically insulating materials that have higher thermal conductivities [5]. Watts per meter-kelvin (W·m −1 ·K −1 ) is the commonly used unit for thermal conductivity in the related disciplines.…”

Silicone Rubber Composites with High Breakdown Strength and Low Dielectric Loss Based on Polydopamine Coated Mica

“…Silicone rubber (SR) has been widely used in high-voltage outdoor insulation due to the excellent hydrophobicity and weather-resistance [1][2][3]. Fillers are added into the pure SR to improve specific properties as well as to reduce cost [4][5][6].…”