Sökning: "leakage current measurements"

Visar resultat 6 - 10 av 36 avhandlingar innehållade orden leakage current measurements.

1. 6. Electromagnetic transformer modelling including the ferromagnetic core

   Författare :David Ribbenfjärd; Göran Engdahl; David Jiles; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Power transformer; hysteresis; dynamic hysteresis; dynamic magnetization; eddy currents; excess losses; leakage flux; winding model; core model; magnetic measurements; magnetic materials; Electric power engineering; Elkraftteknik;

   Sammanfattning : In order to design a power transformer it is important to understand its internal electromagnetic behaviour. That can be obtained by measurements on physical transformers, analytical expressions and computer simulations. LÄS MER

3. 7. A lumped element transformer model including core losses and winding impedances

   Författare :David Ribbenfjärd; Göran Engdahl; Arvid Broddefalk; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; power transformer; hysteresis; dynamic hysteresis; eddy currents; excess eddy currents; leakage flux; winding model; core model; magnetic measurements; magnetic materials; Electrical engineering; Elektroteknik;

   Sammanfattning : In order to design a power transformer it is important to understand its internal electromagnetic behaviour. That can be obtained by measurements on physical transformers, analytical expressions and computer simulations. LÄS MER

4. 8. Image Analysis for Diagnostics of Insulators with Biological Contamination

   Författare :Andreas Dernfalk; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; climate chamber; fungi; composite insulators; biological contamination; digital image analysis; Outdoor insulation; algae; leakage current measurements;

   Sammanfattning : Composite insulators have a number of advantages compared to conventional insulators. However, the fact that they are more prone to aging is a major drawback. For instance, biological growths, like algae and fungi, have been found to colonize composite insulators, and possibly effecting the performance of the materials. LÄS MER

5. 9. Gallium arsenide based buried heterostructure laser diodes with aluminium-free semi-insulating materials regrowth

   Författare :Carlos Angulo Barrios; KTH; []
   Nyckelord :semiconductor lasers; in-plane lasers; VCSELs; GaAs; GaInP; semi-insulating materials; hydride vapour phase epitaxy; regrowth; buried heterostructure; leakage current; simulation;

   Sammanfattning : Semiconductor lasers based on gallium arsenide and relatedmaterials are widely used in applications such as opticalcommunication systems, sensing, compact disc players, distancemeasurement, etc. The performance of these lasers can beimproved using a buried heterostructure offering lateralcarrier and optical confinement. LÄS MER

7. 10. Resistivity investigation and monitoring for detection of internal erosion and anomalous seepage in embankment dams

   Författare :Pontus Sjödahl; Teknisk geologi; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hydrogeologi; teknisk geologi; internal erosion; Hydrogeology; geographical and geological engineering; time-lapse inversion; inversion; monitoring; modelling; resistivity; detection; leakage; seepage; teknisk geografi; embankment dam;

   Sammanfattning : Methods for monitoring seepage and detecting internal erosion are essential for the safety evaluation of embankment dams. Internal erosion is one of the major reasons for embankment dam failures, and there are several tenths of thousands of large embankment dams in the world. LÄS MER