High voltage auto transformers are regarded as one of the most important and expensive electrical power system devices. Thus, it is essential to remotely control and monitor their operating conditions. A key objective...
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High voltage auto transformers are regarded as one of the most important and expensive electrical power system devices. Thus, it is essential to remotely control and monitor their operating conditions. A key objective of autotransformer monitoring systems is to ensure continuity and reliability of autotransformer operation resulting in a reduction in costs and economic losses associated with the possible failures of autotransformers. This paper presents details regarding the laboratory equipment and the associated lab exercises used to teach transformer monitoring concepts to fifth-year electrical power systems engineering students at Warsaw University of Technology in Poland. These students develop a comprehensive understanding of high voltage autotransformer monitoring and protection through the use of an ADAM5510E/TCP microprocessor-based controller.
This paper describes a fault-tolerant control system for a high performance induction motor drive.A new fault-tolerant scheme using three microprocessor-based controllers is presented. In the proposed scheme, two of t...
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This paper describes a fault-tolerant control system for a high performance induction motor drive.A new fault-tolerant scheme using three microprocessor-based controllers is presented. In the proposed scheme, two of the three processors always compare the results of their computations with each other in order to detect a fault, and when a fault is detected, the third processor is used to locate it. By this, the proposed scheme guarantees high reliability and provides the flexibility for the utilization of redundancies. Through the comparison of the estimated reliability, it is verified that the proposed scheme gives higher reliability than the TMR (Triple Modular Redundancy) to the control system for the induction motor drive.
This paper presents the results of a study of using a microprocessor-based controller for a cross-cutter in the floating glass industry. The design of the controller is based on the state-space method. Due to appropri...
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This paper presents the results of a study of using a microprocessor-based controller for a cross-cutter in the floating glass industry. The design of the controller is based on the state-space method. Due to appropriate pole-placement and feedforward control, the system has both a good dynamic performance and high steady state accuracy to a ramp input. By using a reduced-order observer instead of a tacho generator, the hardware is more economical, and what is more, the logic control is also programmed in the same microprocessor, hence the hardware is greatly simplified. This in turn improves the realiability and reduces the cost. Finally, for comparison experiment results are given for this new controller and a conventional PID controller
Many small communities in the world still use telephone switching systems based on old step-by-step technologies. Given the capital already invested, it may be economically unattractive to replace them in the near fut...
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Many small communities in the world still use telephone switching systems based on old step-by-step technologies. Given the capital already invested, it may be economically unattractive to replace them in the near future. The equipment described here makes it possible to implement Long Distance Dialing and a number of services with this kind of switching systems, providing an inexpensive alternative for prolonging their useful life. Its development required the design of a specialized bus and a methodology for concurrent programming with sequential FORTRAN.
The feasibility of using thyristor fault-current limiters to limit transient and steady-state currents in an alternator during a symmetrical fault has been investigated. Experimental results include discussions on tim...
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The feasibility of using thyristor fault-current limiters to limit transient and steady-state currents in an alternator during a symmetrical fault has been investigated. Experimental results include discussions on time reponse of line currents, current through one of the thyristors and limiting inductor as well as voltage across the thyristor and limiting inductor. Triggering of the thyristor elements has been implemented through a microprocessor-based controller. The fault analysis with the aid of a computer is also included for a specific case.
Semiconductor-diode fault-current limiters, suitable for limiting subtransient and transient currents in an alternator system during symmetrical and unsymmetrical faults, are investigated. Experimental results coverin...
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Semiconductor-diode fault-current limiters, suitable for limiting subtransient and transient currents in an alternator system during symmetrical and unsymmetrical faults, are investigated. Experimental results covering the time response of line currents, diode current and current through the limiting inductor, as well as voltages across the diode and limiting inductor, are presented. In the laboratory experimental setup a microprocessor-based controller was made use of for fault initiation. Results of computer-aided analysis of a specific case of fault are discussed.
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