Sökning: "controlled switching"
Visar resultat 1 - 5 av 85 avhandlingar innehållade orden controlled switching.
1. Three Phase Controlled Fault Interruption Using High Voltage SF6 Circuit Breakers
Sammanfattning : A method is presented for implementing controlled fault interruption,using high voltage, SF6 circuit breakers on three phase high voltage powernetworks. The main goal of the method is to synchronize the opening or tripcommands to each phase of a circuit breaker with respect to target currentzero times so that each phase will interrupt with a preselected arcingtime. LÄS MER
2. Spin-diode effect and thermally controlled switching in magnetic spin-valves
Sammanfattning : This thesis demonstrates two new device concepts that are based on the tunneling and giant magnetoresistance effects. The first is a semiconductor-free asymmetric magnetic double tunnel junction that is shown to work as a diode, while at the same time exhibiting a record high magnetoresistance. LÄS MER
3. Controlled switching of high voltage SF6 circuit breakers for fault interruption
Sammanfattning : .... LÄS MER
4. Cost-effective Cells for High-power Modular Multilevel Converters
Sammanfattning : The modular multilevel converter (MMC) topology was introduced in 2003and has since been receiving considerable attention from industry and academia.Notable benefits compared to two- or three-level voltage source convertersare its scalability, low switching losses, low output filter requirementsand ease of adding redundancy combined with fail-safe operation. LÄS MER
5. EMC Aspects of PMW Controlled Loads in Vehicles
Sammanfattning : The number of electrically driven loads in a modern vehicle is constantly increasing. Many loads that former were mechanically driven will in the future be driven by electricity. This implies that a number of electronic systems have to be packed together in the limited space in a vehicle. LÄS MER