Sökning: "overvoltage"
Visar resultat 11 - 15 av 26 uppsatser innehållade ordet overvoltage.
11. Resynchronisation of Islanded Power Systems
Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)Sammanfattning : The electricity demand and need of renewably produced electricity has increased the interest in locally produced electricity, also called distributed generation. The increase of distributed generation increases the risk of islanding, a state when a part of the grid has been electrically isolated. LÄS MER
12. Transient Voltage Distribution in Bushing
Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)Sammanfattning : An electrical bushing is one of the most important elements in a power transformer. Steep front surges such as transient impulse voltage from lightning strikes is an inevitable electromagnetic transient mostly happening in power transmission and distribution system. The bushing might lead to be degraded due to such kind of surge. LÄS MER
13. Utveckling av kontrollrumsstyrning : För DC-generator genom PLC och HMI
M1-uppsats, Högskolan i Borås/Akademin för textil, teknik och ekonomiSammanfattning : Projektet går ut på att ersätta den befintliga styrningen av en DC-generator för 1200 kV med en fjärrstyrning från kontrollrummet via optolänk. Den nya styrningen ska utgöras av ett PLC-system (Programmable Logic Controller) som manövreras med hjälp av ett HMI – Human Machine Interface. LÄS MER
14. Pre-study and system design of a mobile platform simulator system
M1-uppsats, KTH/Hälsoinformatik och logistikSammanfattning : There are many ways to produce energy, using e.g. gas or hydro turbines. To guarantee a stable power output, it is important to consider components that could control and adjust the output power automatically. LÄS MER
15. High-Frequency Voltage Distribution Modelling of a Slotless PMSM from a Machine Design Perspective
Master-uppsats, KTH/ElkraftteknikSammanfattning : The introduction of inverters utilizing wide band-gap semiconductors allow for higher switching frequency and improved machine drive energy efficiency. However, inverter switching results in fast voltage surges which cause overvoltage at the stator terminals and uneven voltage distribution in the stator winding. LÄS MER