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Partial Discharge (PD) measurement and analysis is now a popular method in condition monitoring and dielectric diagnosis of power transformers. Discrete Wavelet Transform (DWT) is a powerful and well known method to analyze PD data in both time and frequency domains. In this contribution, the application of this transform on de-noising of recorded PD signals, defect classification and separating PD...
Measuring partial discharge and interpreting its patterns has become a common tool to recognize the type of insulation defects of high voltage equipments. Using statistical features of phase dependent patterns have the most use in PD analysis now. However, these patterns contain less information of PD pulses sequence which is in close relation with defect type. Therefore, nowadays more research studies...
In this paper an ultra-wide-band partial discharge measuring system is introduced. These systems are approximately new. Advantages of this system such as effective noise reduction, feature extraction based on pulse waveform are discussed. A new feature for separating different types of pulses is proposed. This feature is dominant frequency of the pulse waveform. A practical partial discharge measurement...
Partial discharge localization in power transformers is an important task for test engineers. Although some theoretical methods have been proposed, there are no devices that directly guide them to a reasonable result. This paper deals with such a device and investigates the characteristics and requirements of its hardware and software modules in detail. The hardware module must be a VHF PD measuring...
In this paper an algorithm for PD localization based on using multi-conductor transmission line model is introduced. In this algorithm sectional winding transfer functions are computed using the winding model. To calculate the parameters of the model including resistances, inductances and capacitances between different turns of the winding, it is necessary to have design data of the transformer. Since...
One of the well-known methods of partial discharge (PD) localization in transformers is based on winding modeling. Although the method is theoretically precise, the reliability of the method is not known in practice, because of the difficulties that arise in high frequency modeling of the winding. In this paper, to investigate the reliability of the PD localization method in practical cases, different...
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