Arabinda Das

Synchronous generators generate electricity at 50 Hz (60 Hz in the U. S.). When driven by steam turbines at high speeds, they are called turbogenerators, while those powered by water at lower speeds are hydrogenerators. Large motors for load management are usually induction motors with squirrel cage construction. Initially, isolated prime-mover generator sets were used, with later advancements introducing synchronization and parallel operation of alternators. Over time, power stations were linked to form power pools, which eventually connected into large, complex grid systems. Engineers have continually developed models for turbogenerators and hydrogenerators for reliable parallel operation. Key control systems include boiler-firing control, turbine-governor control, and exciter-AVR controls for turbogenerators, while hydrogenerators require the latter two and modeling for static and transient droop. Early models followed guidelines by Blondel, Nickle, and Doherty, later expanded by R. H. Park for transient analysis. Computer methods for stability analysis have advanced through ongoing research. This book presents seven chapters on modeling synchronous motors.

3-phase core type transformers are one of most important equipment and are mostly used as power transformers in various applications. These transformers are equipped with a third winding for supplying station auxiliaries and for other reasons which is called tertiary winding. The cost of these transformer is a sizable proportion of the total system cost within which it is operated. A number of methodologies have already been developed to execute design of the transformer cost optimally. However, a developed a simplified method for optimizing the design process is depicted in this book in presence of constraints specified by the customer and the regulatory authorities, through exhaustive search using nested loops. The method appears to be best at present considering the enormous speed of the computers. A case study is given in this book based on this method and has been given at the end. Optimal design of 3-phase 3-winding transformers have been made by using two methods and the cost of production has been taken as the objective function based on the two key variables. Exhaustive search and sequential gradient search are used to reach the goal.

In order to fulfill the tremendous worldwide demand for electrification, power line professionals will need to adopt rapid, reliable and sustainable solutions. For example, in a fast-developing country like India, which had the largest population without electricity in 2014 and 1.34 billion inhabitants in 2017, the demand for electrification is immense. In recent years, a new program facilitated 0.73 million new household connections per month and almost 19,000 villages per year. Wide-spread experience in geographical, geological, social and economic diversity leaves no doubt that overhead power lines (OHL) are the only way to provide electricity to communities where underground lines are technically unfeasible or too expensive. This book presents the technology and recent research into OHL in a concise and systematic way. After brief introductory sections, chapters cover line support, foundation and mechanical sag, corona discharge, overhead line insulators and conductors, earthing and earth wire, lightning and surge protection, insulation and coordination, route selection, commissioning, operation and maintenance. This book is a must-read for researchers and experts involved with utilities and particularly for anyone associated with the installation, electrification, operation and maintenance of overhead lines in transmission and distribution networks.