Sökning: "Cavity PD"
Visar resultat 1 - 5 av 21 avhandlingar innehållade orden Cavity PD.
1. Dielectric Response and Partial Discharge Diagnostics of Insulation Systems by Utilizing High Voltage Impulses
Sammanfattning : In this thesis, power system transients are considered as an opportunity for development of on-line diagnostics of power components and specifically the insulation systems of power transformers and bushings.A new technique for on-line dielectric response measurement of power transformer bushings is proposed which utilizes natural transients in the power system, such as lightning and switching surges, as stimuli. LÄS MER
2. Modelling of cavity partial discharges at variable applied frequency
Sammanfattning : The presence of partial discharges (PD) in high voltage components is generally a sign of defects and degradation in the electrical insulation. To diagnose the condition of high voltage insulation, PD measurements is commonly used. LÄS MER
3. Squamous cell carcinoma of the head and neck, focusing on Epstein-Barr-virus, programmed cell death ligand 1 and serum lipoproteins
Sammanfattning : Background: Squamous cell carcinoma of the head and neck (SCCHN)comprises a large group of tumours including the oral cavity and nasopharyngealarea, and typically affects older males in association with alcohol/tobacco usage.Within the oral cavity, the mobile tongue is the most common site for tumourdevelopment. LÄS MER
4. Studies of pathophysiological mechanisms and oral cavity manifestations in chronic inflammatory diseases
Sammanfattning : Systemic Lupus Erythematosus (SLE) is a chronic autoimmune disease with a 9:1 female predominance where many genetic and clinical characteristics overlap with other inflammatory conditions such as rheumatoid arthritis (RA). Closely monitoring and treating active disease leads to better prognosis and quality of life for these patients since a cure is to date not available. LÄS MER
5. Partial discharges studied by dielectric response method
Sammanfattning : The increasing demand of integrating various renewable energy recourses in power system requires extensive use of power electronic solutions, which allows energy conversion between different frequencies and stabilizes the system. Consequently, other than the traditional 50/60 Hz sinusoidal voltage stresses act on the high voltage insulation systems. LÄS MER