Show simple item record Zhang, Zhengkao en_US 2007-05-15T15:26:10Z 2007-05-15T15:26:10Z 1997-11-01T00:00:00Z en_US
dc.description.abstract To ensure the reliability of power supply it becomes necessary to periodically monitor the condition of power apparatus. Conventionally this may be achieved by carrying out tests such as the partial discharge and dissipation factor tests in a laboratory. This method, however, requires that the apparatus in question be disconnected from service and transported to the testing location. In the last few years on-line diagnostic tests have found favour not only because they are cost effective but also do not involve service interruption and furthermore offer the possibility of continuous monitoring. The reported methods measure the phase difference between voltage and current digitally by converting the signals to rectangular waveforms while preserving zero crossings. The method discussed in this paper uses a different technique. The Discrete Fourier Transform (DFT) is performed on the acquired analog signals; the phase difference is found from phase information of the fundamental quantities. This procedure effectively eliminates errors due to harmonics. It has an additional advantage in that the error introduced due to noisy data is smaller than that present in a method which relies on detection of zero crossings. The suggested method has been validated by comparison with the results obtained by a conventional bridge measurement. The effects of sampling rate and system frequency fluctuation on the measurement have also been studied. en_US
dc.format.extent 4576388 bytes
dc.format.extent 184 bytes
dc.format.mimetype application/pdf
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dc.language en en_US
dc.language.iso en_US
dc.rights info:eu-repo/semantics/openAccess
dc.title Digital technique for on-line measurement of dissipation factor of high voltage apparatus en_US
dc.type info:eu-repo/semantics/masterThesis Electrical and Computer Engineering en_US Master of Science (M.Sc.) en_US

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