The paper presents available drive train configurations and alternative methods for driving a cement plant kiln. Driving equipment options using hydraulic motors, DC drives or variable frequency drives employing both current and voltage source technologies are evaluated in terms of performance, reliability, maintenance, operating efficiency and total cost of ownership. Drive and motor performance requirements are reviewed in relation to torque/current speed characteristics of the kiln load. Torque pulsations and induced vibrations and their effect on the mechanical drive train components are reviewed.Index Terms -Kiln application, drive control, torque IntroductionSelection and application consideration for drives and motors powering the kiln is a continuously evolving process. The latest variable speed control technologies have proven to be efficient and reliable in several installations in operation today.

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Large Variable Frequency Drive installations require considerable planning to be successful. Not only does the installation affect the process, existing electrical equipment, power quality, reliability, training and maintenance programs will also be affected. Important considerations include electrical distribution modifications, ensuring power quality is maintained, proper installation guidelines are followed for the VF Drive, essential electrical and safety protection is implemented, a comprehensive commissioning procedure is followed and maintenance and personnel receive upgrading to service the new equipment. This paper will cover each of these aspects and provide a guideline for considerations during the design stage of new large power VF Drive installations in the Cement Industry.

Professional Development School (PDS) partnerships offer a powerful leverage point for the improvement of student learning in the K-12 sector and a unique opportunity to experiment with new forms of online learning for the adults who work in and with schools. In this paper we present lessons learned in the design and delivery of online courses to teacher educators, classroom teachers, support personnel, and student teachers associated with the Virtual Professional Development School Consortium (VPDSC). This paper describes the NetSeminar model that is evolving through this work and considers implications for further development.