Sökning: "switching overvoltage"

Hittade 2 uppsatser innehållade orden switching overvoltage.

1. 1. High-Frequency Voltage Distribution Modelling of a Slotless PMSM from a Machine Design Perspective

   Master-uppsats, KTH/Elkraftteknik

   Författare :Patrik Brauer; [2018]
   Nyckelord :Windings; drives; transients; surges; steep-fronted; slotless; litz-wire; effective relative permeability; Lindningar; elektriska drivlinor; transienter; spänningspulser; litz-tråd; effektiv relativ permeabilitet;

   Sammanfattning : 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

3. 2. Electrical Surge Protection at Hydropower Plants

   Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Institutionen för teknikvetenskaper

   Författare :Martin Ölund; [2016]
   Nyckelord :surge arrester; overvoltage; hydropower; surge capacitor; lightning overvoltage; switching overvoltage;

   Sammanfattning : Hydropower plants contains a lot of vital electrical power technology such as generators and transformers. To prevent damage to this equipment due to overvoltage, they are often protected by surge arrester and in some cases also by surge capacitors. LÄS MER