Sökning: "Cables"

Visar resultat 26 - 30 av 153 avhandlingar innehållade ordet Cables.

1. 26. Essays on Development and Politics in Sub-Saharan Africa

   Författare :Jonas Poulsen; Eva Mörk; Niklas Bengtsson; Karl Moene; Uppsala universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; ANC; regression discontinuity; IV; party effects; Rwandan genocide; rainfall; propaganda; social capital; South Africa; mining; resource curse; crime; criminality; Internet; protests; submarine cables; regime change; Africa; employment; light;

   Sammanfattning : Essay I: The African National Congress (ANC) can look back on eighty years of struggle which resulted in the liberation of black Africans, the creation of a democratic constitution and free elections. However, the last twenty years of ANC rule has been criticized for the failure to bring higher living standards for the formerly oppressed. LÄS MER

3. 27. Techniques for Localization of Insulation Degradation along Medium-Voltage Power Cables

   Författare :Ruslan Papazyan; Roland Eriksson; Fred Steennis; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electrical power technology; Attenuation measurement; cross-linked polyethylene insulation; discontinuities; localization; mass-impregnated insulation; numerical analysis; parameter estimation; power cable metallic screen; scattering parameters; time domain reflectometry; velocity measurements; water treeing; Elkraftteknik; Electric power engineering; Elkraftteknik;

   Sammanfattning : Time Domain Reflectometry (TDR) has been used for localization of transmission line discontinuities in diverse applications. Various challenges have to be addressed when applying TDR for localization of insulation degradation in power cables. LÄS MER

4. 28. Experimental investigation of steel cables for rock reinforcement in hard rock

   Författare :Bengt Stillborg; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mining and Rock Engineering; Gruv- och Berganläggningsteknik;

   Sammanfattning : This thesis describes a detailed experimental investigation of the mechanical behaviour of fully grouted steel cables used for rock reinforcement in hard rock. An attempt is also made to explain the possible modes of deformation and cable failure, based on observations from the experiments. LÄS MER

5. 29. Development of on-line diagnostic methods for medium voltage XLPE power cables

   Författare :Valentinas Dubickas; Hans Edin; Roland Eriksson; Matti Lehtonen; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electrical engineering; Elektroteknik;

   Sammanfattning : On-line diagnostics of power system components is an important area since it allows the diagnostics to be performed at regular intervals during the normal operation of the components. This combined with reliability centered maintenance could lead to reduced customer outages. LÄS MER

7. 30. On-line time domain reflectometry diagnostics of medium voltage XLPE power cables

   Författare :Valentinas Dubickas; Roland Eriksson; Tord Bengtsson; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electrical engineering; Elektroteknik;

   Sammanfattning : Degradation of XLPE insulated power cables by water-trees is a primary cause of failure of these cables. The detection of water-trees and information about the severity of the degradation can be obtained with off-line measurement using dielectric spectroscopy. In many situations only a limited part of the cable may be degraded by the water-trees. LÄS MER