Search for dissertations about: "high voltage diagnostic"
Showing result 1 - 5 of 23 swedish dissertations containing the words high voltage diagnostic.
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1. Development and application of high voltage dielectric spectroscopy for diagnosis of medium voltage XLPE cables
Abstract : When polymer power cables were introduced into mediumvoltage applications in the late 1960s, the degradationphenomenon later referred to aswater treeingwas still unknown. However, this changedwithin a relatively short space of time. READ MORE
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2. High Voltage Insulation Diagnostics Utilizing HTS-SQUID Based Amplifiers
Abstract : In the design and development of high voltage insulation systems, different diagnostic methods are often used for system characterization. It is therefore crucial to continuously improve existing methods and to develop new ones. READ MORE
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3. Partial Discharges Studied with Variable Frequency of the Applied Voltage
Abstract : This thesis concerns partial discharge (PD) diagnostics withvariable frequency of applied voltage in the frequency range 1mHz - 400 Hz. The exploration of a new type of spectroscopythat combines partial discharge analysis and dielectricresponse is demonstrated. READ MORE
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4. Experimental studies of turbulent flames at gas turbine relevant burners and operating conditions
Abstract : With the increasing demand of using alternative and renewable fuels, it becomes of vital importance to consider the fuel flexibility when designing a new burner for gas turbines. Hydrogen-enriched fuel and ammonia are two of these potential fuels, and they can significantly change the operability range of the gas turbines. READ MORE
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5. Characterization of Electrical Insulation Exposed to Arbitrary Voltage Waveforms
Abstract : The extensive use of power electronics in power systems today gives rise to other voltage waveforms than the conventional 50/60 Hz sinusoidal and consequently other types of electric stress act on high voltage insulating materials. Previous studies has shown that Pulse Width Modulated (PWM) voltages and similar waveforms increase stress in Adjustable Speed Drives (ASD) as compared with sinusoidal waveforms and it has also been shown that partial discharge (PD) activity is intensified during PWM voltages and that rise time of square like pulses affect PD inception voltage. READ MORE