A series of temporary fast turbine v a l v i m) field tests were carried out on AEP's Rockport 1300 MW unit. These four tests at various unit loading levels verified the functional aspects of the TFTV scheme-including the control and intercept valve stroke characteristics and the rapid reduction of mechanical driving power. This paper presents an analysis of the mechanical and electrical performance characteristics of the Rockport unit during TFTV. A comparison of the test measurements with digital simulation results is also provided to validate the simulation tools and models commonly used in system dynamics studies.
This paper describes the system planning issues addressed and briefly reviews the planning studies carried out to determine the required EHV transmission facilities associated with the 2600 MW coal-fired Rockport Plant on the American Electric Power (AEP) System. This plant is located on the Ohio River in southern Indiana about 100 miles from the nearest AEP transmission facilities and about 150-250 miles from the nearest AEP load centers. Due to the remote location of this plant site and the need to minimize construction of new facilities because of financial and environmental considerations, only two lines have been constructed to integrate this plant into the existing transmission network. The steady state and dynamic performance of the Rockport Plant and the associated transmission system are discussed in this paper, including the improvements in performance which have been achieved by installing single-phase switching on both plant transmission outlets and temporary fast turbine valving on both 1300 MW generating units.
This paper is one of a series presented on behalf of the System Operations Subcommittee with the intent of focusing industry attention on current problems faced by electric utilities in the operation of the bulk power system. The paper is a compilation of short notes that describe the ramifications of loop flows on the power systems of the Pennsylvania -New Jersey -Maryland Interconnection, American Electric Power System, and the members of the Western Systems Coordinating Council. The operating problems caused by large loop flows are fairly well understood.The purpose of these short notes is to highlight the complexity of the problem and underscore the need for a full comprehension of the problem within the engineering community.
This paper presents the details of an in-depth analysis carried out to investigate an out-of-phase synchronizing condition which resulted in the failure of a 725 MVA GSU transformer. Using a technique described in this paper, the circuit breaker closing angle was estimated from oscillograph traces. This information was used with the Electromagnetic Transients Program (EMTP) to simulate the disturbance events and thereby produce a complete set of probable synchronizing currents and generator electrical torques experienced during the disturbance.The analysis of the simulation results, and further, the analysis of the failure of the GSU transformer have been viewed in light of the large number of prior system faults in the vicinity of the transformer. A brief review of the ANSI/IEEE standards on transformer fault withstand capabilities as related to this type of analysis is also presented.
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