Sökning: "PARTIAL"

Visar resultat 6 - 10 av 2190 avhandlingar innehållade ordet PARTIAL.

1. 6. Partial Discharges at Repetitive Rapidly Changing Voltages

   Författare :Elisabeth Lindell; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; high dV dt; oil paper insulation.; repetitive voltages; short rise time; partial discharge measuring techniques; twisted pair; square-like voltages; corona; Partial discharges PDs ;

   Sammanfattning : Electrical insulation can today be exposed to voltages having considerably higherfrequency components than the conventional power frequency AC 50 Hz or 60 Hz,for example due to the increased use of power electronics in power systems. Thishas in a number of cases caused unexpected behaviour, including failures. LÄS MER

3. 7. Partial discharges detected by stator slot couplers

   Författare :Jörgen Blennow; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; PD; statistical analysis; attentuation; on-line; SSC; partial discharges; stator slot couplers; frequency spectrum; state estimation; pulse shape; stator winding model; distortion;

   Sammanfattning : .... LÄS MER

4. 8. Partial Balayage and Related Concepts in Potential Theory

   Författare :Joakim Roos; Henrik Shahgholian; Björn Gustafsson; Charles Smart; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Partial balayage; equilibrium measure; obstacle problem; divisible sandpile; Riemannian manifold; quadrature domain; Laplacian growth; mother body; Mathematics; Matematik;

   Sammanfattning : This thesis consists of three papers, all treating various aspects of the operation partial balayage from potential theory.The first paper concerns the equilibrium measure in the setting of two dimensional weighted potential theory, an important measure arising in various mathematical areas, e.g. LÄS MER

5. 9. A program manipulation system based on partial evaluation

   Författare :Anders Haraldsson; Erik Sandewall; Mats Nordström; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; program manipulation; partial evaluation; program optimization; LISP; beta-expansion; macro-expansion; Computer science; Datavetenskap;

   Sammanfattning : Program manipulation is the task to perform transformations on program code, and is normally done in order to optimize the code with respect of the utilization of some computer resource. Partial evaluation is the task when partial computations can be performed in a program before it is actually executed. LÄS MER

7. 10. Electrical Characterization of Partial Discharge Resistant Enamel Insulation

   Författare :Tuan Anh Hoang; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Enamel wire insulation; dipolar polarization; charge injection; charge transport; chromium oxide; dc conductivity; partial discharge; twisted pair.; dielectric permittivity;

   Sammanfattning : Adjustable speed drives for rotating machines have become increasingly popular as they provide possibilities of smooth and accurate process control as well as for energy savings. In such systems, due to the fact that the voltage applied at terminals of motor windings is no longer purely sinusoidal but characterized by a high content of harmonics, the appearing electrical and thermal stresses yield premature failures of the winding insulation, mainly because of an increased partial discharge (PD) activity. LÄS MER