Sökning: "metal oxide varistor"
Visar resultat 1 - 5 av 6 avhandlingar innehållade orden metal oxide varistor.
1. Recycling of Antimony and Zinc from Metal Oxide Varistors (MOVs)
Sammanfattning : .... LÄS MER
2. Novel powder-coating solutions to improved micro-structures of ZnO based varistors, WC-Co cutting tools, and Co/Ni nano-phase films and sponges
Sammanfattning : Solution chemistry is a versatile and powerful tool in the synthesis of designed, complex nano-level high-tech materials. Normally, the technique is considered too expensive for large-scale production of complex multi-component ceramic materials. LÄS MER
3. Studies on the Recovery of Secondary Antimony Compounds from Waste
Sammanfattning : The global supply of antimony is dominated by one country which has led the European Union to classify antimony as a critical raw material. Other than the rare-earth elements antimony has the highest supply risk. Therefore, a feasibility study on the recycling of antimony and antimony compounds is of great importance. LÄS MER
4. Studies on Current Commutation in Hybrid DC-breakers
Sammanfattning : Compared to conventional AC-circuit breakers, a DC-breaker has to act fast and force the current down to zero. Many different DC-breaker topologies are available, and this thesis is focused on the hybrid DC-breaker comprising a mechanical switch and high power semiconductors. LÄS MER
5. On the design of hybrid DC-breakers consisting of a mechanical switch and semiconductor devices
Sammanfattning : The interest of using direct current in networks for both transmission and distribution of power is increasing due to the higher efficiency compared to the alternating current used today. As no natural zero crossings exist in direct current, the interruption of fault currents becomes a challenge. LÄS MER