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Next‐generation microelectronics and electrical power systems call for high‐energy‐density dielectric polymeric materials that can operate efficiently under elevated temperatures. However, the currently available polymer dielectrics are limited to relatively low working temperatures. Here, the solution‐processable polymer nanocomposites consisting of readily prepared Al2O3 fillers with systematically...
The current interruption capacity of gas gap can be enhanced by series connecting with vacuum gap in hybrid circuit breaker. For the purpose of compensating the inferior interruption performance of CO2 gas gap, as the substitute for SF6 gas gap, the interruption principle and the dielectric strength recovery process of the series gaps of vacuum gap and CO2 gas gap are studied in this paper. Based...
CO2 gas is a possible substitute for SF6 gas in circuit breaker with relatively superior arc interruption performance. To enhance the interruption capacity of the circuit breaker which employs CO2 gas as its arc interruption dielectric, the interruption principle of the hybrid circuit breaker composed of vacuum interrupter and CO2 gas interrupter is studied. Based on the black-box arc models of hybrid...
Impedance spectroscopy is a very powerful tool to characterize and separate physical processes that can occur simultaneously in any material. For parallel plate capacitors, consideration of the modulus has proven to be very effective to study materials that exhibit a spatial variation in conductivity in the direction of the electric field. This was demonstrated with in-situ impedance measurements...
Voltage Source Converter (VSC) based HVDC (VSC- HVDC) transmission technology as a kind of new dc transmission, is attracting more and more research. VSCs are susceptible to cable short-circuit fault and ground fault. This paper focuses on the transient characteristics of electrical quantities in a two terminal VSC-HVDC system after the occurrence of short-circuit fault and ground fault. Equivalent...
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