Abstract: Pumped hydro is one of more economic and reliable storage mechanisms for plants with higher capacities. To make the pumped storage system more effective, the best machine suited for this purpose must be used. Present paper deals with the comparison of various possible machines in pumped hydro systems. Synchronous machines, fixed and variable speed induction machines and doubly-fed induction machines were compared for pump and turbine applications. The possible configuration and basic characteristics of each machine are described for pumped hydro application.

• Publication Date: 25-May-2014
• DOI: 10.15224/978-1-63248-028-6-02-132
• Views: 0
• Downloads: 0

Abstract: The paper highlights the possibility of using Polypyrrole (PPy) for planar microstrip patch antenna (MPA).The MPA has been designed using a conducting polymer PPy and PlexiglasTM laminate with a thickness of 1.8mm. The bulk conductivity of polypyrrole is 1200 and thickness is taken as 90mm.An analogous structure is designed using copper patch validating the design and comparing the performance. The antenna was designed for operations at 5.8 GHz. The PPy structure shows a gain of 4.6dB in contrast to 4.8dB gain of Cu structure. A comparative analysis is done between performance characteristics of Cu and PPy material fabricated on Plexiglas substrate results with good performance of PPy material. The result obtained confirms the advantage of using polymer materials in microwave applications as compare to the copper generally used.

• Publication Date: 25-May-2014
• DOI: 10.15224/978-1-63248-028-6-02-133
• Views: 0
• Downloads: 0