[Legacy Report] IEEE seminar by Saurav Pramanik on "Innovative Applications from Analysis of Frequency and Time Domain Response of Transformer Winding"
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Power transformers are vital links in an electrical network, whose normal working is paramount for uninterrupted operation of a power system. In the post-deregulated era, it emerges that condition monitoring of HV apparatus followed by meaningful diagnosis, is the ideal way to avoid unplanned outages, optimize assets, reduce operating costs and thus operate the plant efficiently. Over the years, many powerful tools have become available for assessing the status of transformers. Among them, frequency response measurement (also called FRA), is the most-sensitive to detect mechanical damage occurring to the windings and core. In spite of its existence for many years, FRA continues to remain as a monitoring tool. It has lot of untapped potential and inherent abilities but the relevant issues have not received the attention it deserves, and research groups working in these areas are also few. So, research efforts are essential to address these issues. In this talk the speaker will present few innovative methods to extract information embedded in the frequency/time domain response of the transformer winding and utilizes them for suggesting simple, but, yet impressive solutions to a few tasks which have until now been thought difficult, if not impossible, to resolve. Two such applications are (i) Investigate indirect measurement of the series capacitance of a transformer winding using the measured response, and (ii) A new diagnostic approach for fault detection in transformer winding using tank current measurement. Details will be presented in the seminar. In the end, speaker will highlight the recent R&D works on energy efficient transformers. Energy efficient transformers play an important role in reducing carbon emissions and hence can contribute a lot in fighting global warming. Speaker will briefly present few innovative approaches for designing such energy efficient transformers. These approaches aim to reduce the core loss, as well as, other stray losses in transformer winding. The aim of this design is also to reduce the cost of overall expenses (i.e. the total cost of ownership) of a transformer.
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