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Open Access Letter Issue
Photon count technique as a potential tool for insulation micro-defect detection: Principles and primary results
iEnergy 2023, 2 (4): 258-263
Published: 08 December 2023
Downloads:4

The requirements for the construction of a new power system inevitably pose significant challenges and changes to the operation and maintenance of the power grid. To ensure the safe and stable operation of ultra-high voltage (UHV) transmission equipment, this work reports on the principles and preliminary results of using electroluminescence (EL)-based photon counting (PC) methods for early detection of micro-defects in GIS/GIL insulation spacer. In this study, the impact of voltage, gas pressure, and gas composition on the photon response of insulation is examined. Furthermore, the corresponding relationship between defect status and photon response characteristics is explored, along with the discussion of the EL mechanism and its evolution induced by defects. The research results demonstrate that PC measurement exhibits high sensitivity to variations in millimeter-scale defect size, position, and morphology at lower electric fields before partial discharge (PD) initiation. With this regard, this paper reveals promising prospects for the early detection of micro-defects in UHV transmission equipment using PC measurement-based methods.

Open Access Research Highlights Issue
World’s first practical power flow algorithm operating on today’s noisy quantum computers
iEnergy 2023, 2 (1): 8
Published: 01 March 2023
Downloads:10
Open Access Issue
Filler Size Effect on Tuning Electrical, Mechanical, and Thermal Properties of Field Grading Composites
CSEE Journal of Power and Energy Systems 2023, 9 (2): 743-750
Published: 25 January 2023
Downloads:38

A field-grading composite with a low switching field, stable nonlinear conductivity performance, and excellent mechanical and thermal properties was prepared by using hybrid ZnO micro-spherical varistors of different particle sizes as the fillers and silicone rubber as the matrix. The hybrid effects of particle size on the electrical, mechanical, and thermal properties of ZnO micro-spherical varistors composites are investigated. An increase in the ZnO micro-spherical varistor size in the composites will lower the switching field but lead to degradation of the mechanical properties and stability of the nonlinear conductivity properties. The silicone rubber is incorporated with a mixture of hybrid ZnO micro-spherical varistors of different sizes at an optimal mass ratio range exhibited low switching field, stable nonlinear conductivity performance, and excellent mechanical and thermal properties. Our findings are helpful to comprehensively regulate performance of advanced field-grading materials and increase stability and durability of electronic and electrical devices.

Open Access Review Issue
China’s 10-year progress in DC gas-insulated equipment: From basic research to industry perspective
iEnergy 2022, 1 (4): 400-433
Published: 20 December 2022
Downloads:89

The construction of the future energy structure of China under the 2050 carbon-neutral vision requires compact direct current (DC) gas-insulation equipment as important nodes and solutions to support electric power transmission and distribution of long-distance and large-capacity. This paper reviews China's 10-year progress in DC gas-insulated equipment. Important progresses in basic research and industry perspective are presented, with related scientific issues and technical bottlenecks being discussed. The progress in DC gas-insulated equipment worldwide (Europe, Japan, America) is also reported briefly.

Open Access Review Issue
Smart dielectric materials for next-generation electrical insulation
iEnergy 2022, 1 (1): 19-49
Published: 25 March 2022
Downloads:381

Smart dielectric materials with bioinspired and autonomous functions are expected to be designed and fabricated for next-generation electrical insulation. Similar to organisms, such dielectrics with self-adaptive, self-reporting, and self-healing capabilities can be employed to avoid, diagnose, and repair electrical damage to prevent catastrophic failure and even a blackout. Compared with traditional dielectrics, the utilization of smart materials not only increases the stability and durability of power apparatus but also reduces the costs of production and manufacturing. In this review, researches on self-adaptive, self-reporting, and self-healing dielectrics in the field of electrical insulation, and illuminating studies on smart polymers with autonomous functions in other fields are both introduced. The principles, methods, mechanisms, applications, and challenges of these materials are also briefly presented.

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