Sökning: "Jonathan Hägerbrand"

Hittade 2 uppsatser innehållade orden Jonathan Hägerbrand.

1. 1. Measurements of resistivity in transformer insulation liquids

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

   Författare :Jonathan Hägerbrand; [2020]
   Nyckelord :transformer oil; resistivity; ions; ion drift model; HVDC; contact resistance;

   Sammanfattning : This thesis focuses on measuring techniques and results of resistivity in four commercially available insulating transformer oils: mineral oil, ester oil and two isoparaffin oils. Two measuring techniques, the industrially used diagnostic system for electrical insulation IDA and the Labview implemented Triangular Method, are used for resistivity measurements and the techniques are compared, a correction algorithm to the triangular method is suggested. LÄS MER

3. 2. Wireless charger

   Kandidat-uppsats, Uppsala universitet/Institutionen för teknikvetenskaper

   Författare :Barry Dyi; Bruce Dondogori; Jonathan Hägerbrand; [2018]
   Nyckelord :trådlös; laddare; iphone;

   Sammanfattning : This project focuses on wireless power transmission (WPT). More specifically, the use of inductive coupling with resonance. The resonance phenomenon makes the transfer of power more efficient, through matching the inductive and capacitive reactances thus eliminating the reactive losses. LÄS MER