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MULTILEVEL INVERTER

                                       MULTILEVEL INVERTER Historical Review From the late nineteenth century through the middle of the twentieth century, DC-to-AC   power conversion   was accomplished using   rotary converters   or   motor-generator   sets (M-G sets). In the early twentieth century,   vacuum tubes   and   gas filled tubes began to be used as switches in inverter circuits. The most widely used type of tube was the   thyratron . The origins of electromechanical inverters explain the source of the term   inverter . Early AC-to-DC converters used an induction or synchronous AC motor direct-connected to a generator (dynamo) so that the generator's commutator reversed its connections at exactly the right moments to produce DC. A later development is the synchronous converter, in which the motor and generator windin...
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Applications of Insulating Materials

All electrical systems require some kind of insulation to prevent short circuits and leaking currents. 3 forms of insulators: solid, liquid and gaseous Performance of these insulators depend on the temperature Classification according to their temperature rating. Impregnation: Letting the solid material absorb some liquid With the advent of new materials, the classification has been modified by International Electrotechnical Commission: The transformer insulation: (a) conductor or turn-to-turn insulation, (b) coil-to-coil insulation, (c) low voltage coil-to-earth insulation, (d) high voltage coil-to-low voltage coil insulation, and (e) high voltage coil-to-ground insulation. Transformer oil -- provides the required dielectric strength and insulation -- cools the transformer by circulating itself through the core and the coil structure. -- should be in the liquid state over the complete operating range of temperatures between -40°C and+50°C. -- gets o...
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JSTL-JSP Standard Tag Library part 2

Evolution of JSTL-JSP Standard Tag Library As JSP grew in popularity, it became clear that different sites' custom tags fell into familiar, frequently used patterns. For example, many pages needed to loop over data to print tables and lists. Vendors of JSP containers and members of the open-source community tried to address these needs by providing collections of tags --tag libraries--that solved common problems. While many JSP page authors used these libraries, nothing tied them together. To address this fragmentation, the Java Community Process --the same group that now maintains and standardizes JSP itself --decided to offer a standard tag library. JSTL 1.0, to include tags for the following common tasks:          •Looping over data to produce tables, lists, etc.          •Conditional operations          •Importing and processing data from other web pages         ...
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