W.L. Snider’s research while affiliated with University of Alabama at Birmingham and other places

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Publications (6)


Report on bus transfer. I. Assessment and application
  • Article

October 1990

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11 Reads

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25 Citations

IEEE Transactions on Energy Conversion

T.A. Higgins

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W.L. Snider

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P.L. Young

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H.J. Holley

The initial assessment phase of bus transfer of station service loads in power generating stations during emergency shutdowns in the Southern electric system is reported. The application philosophy developed for evaluating bus transfer performance is presented. A brief overview of the types of transfer schemes available, the motivating factors, and the criteria for transferring loads are given. The techniques for evaluating transfer performance and general results for a sample evaluation are presented


Report on bus transfer. III. Full scale testing and evaluation

October 1990

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7 Reads

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8 Citations

IEEE Transactions on Energy Conversion

For pt.II see ibid., vol.5, no.3, p.470-6 (1990). Results from selected full-scale bus transfer tests are presented. The discussion of each test includes a comparison of the actual test results with computer simulations. Actual field tests are conducted in a manner designed to mimic normal operating conditions as closely as possible. High-speed chart recorders are utilized to gather test data. Typically, the tests are performed during a major outage or just prior to the initial start-up of a new unit. After testing, the auxiliary system computer models are modified to represent as closely as possible actual operating conditions at the time of the test


Report on bus transfer. II. Computer modeling for bus transfer studies

October 1990

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12 Reads

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14 Citations

IEEE Transactions on Energy Conversion

The ability to model the entire auxiliary system of large generating stations during emergency shutdown conditions aids the station designer in selecting the proper bus transfer scheme or schemes to implement. The purpose of this paper is to provide one approach to developing such a model. The paper addresses representation of the power sources and the most popular types of transfer schemes. It also provides discussions on the major plant loads and their representations. Finally, results from the model presented are compared with an actual field test for reclosing an auxiliary bus in a fossil-fired generating station.


A Comparison of induction motor models for bus transfer studies

July 1990

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22 Reads

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8 Citations

IEEE Transactions on Energy Conversion

Some commonly used models of induction motors may give erroneous results in bus transfer studies of auxiliary systems which contain induction motors driving low inertia loads. A thorough bus transfer study must consider three time periods: the disconnect period, the period immediately after reenergization, and the longer time period during which bus voltage and motor speeds are restored. This paper provides a report on a current investigation to determine if improved accuracy can be obtained using different induction motor models than presently being employed by the authors [1,2] for bus transfer simulations where the loads have low inertias. Bus transfer simulations are presented using five different models. Based on a comparison of these simulations, a motor model for each of the three time periods of interest is recommended.


Report on bus transfer. Part 3; Full scale testing and evaluation

January 1990

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8 Reads

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2 Citations

IEEE Transactions on Energy Conversion

Development and testing of emergency transfer of generating plant auxiliary system loads on the Southern electric system (SES) dates back approximately 15 years. Results of the bus transfer testing program have led to the refinement of automatic-supervised transfer schemes that allow for a safe and orderly shutdown in the event of a unit trip. The purpose of this paper is to present results from selected full scale tests and to demonstrate the value of a testing program. The discussion of each test includes a comparison of the actual test results with computer simulations.


Report on bus transfer. Part 2; Computer modeling for bus transfer studies

January 1990

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6 Reads

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3 Citations

IEEE Transactions on Energy Conversion

The ability to model the entire auxiliary system of large generating stations during emergency shutdown conditions aids the station designer in selecting the proper bus transfer scheme or schemes to implement. The purpose of this paper is to provide one approach to developing such a model. The paper addresses representation of the power sources and the most popular types of transfer schemes. It also provides discussions on the major plant loads and their representations. Finally, results from the model presented are compared with an actual field test for reclosing an auxiliary bus in a fossil-fired generating station.

Citations (2)


... Most of the existing publications regarding Automatic Bus Transfer Scheme (ABTS) is for motor bus load applications [8][9][10][11][12][13][14][15]. The existing automatic transfer methods for primary auxiliary buses that supply major rotating machinery loads can be classified to include Fast, Slow, Parallel, Residual Voltage, and In-Phase Transfer methods [12,13]. ...

Reference:

IEC 61850 Enabled Automatic Bus Transfer Scheme for Primary Distribution Substations
Report on bus transfer. I. Assessment and application
  • Citing Article
  • October 1990

IEEE Transactions on Energy Conversion

... Most of the existing publications regarding Automatic Bus Transfer Scheme (ABTS) is for motor bus load applications [8][9][10][11][12][13][14][15]. The existing automatic transfer methods for primary auxiliary buses that supply major rotating machinery loads can be classified to include Fast, Slow, Parallel, Residual Voltage, and In-Phase Transfer methods [12,13]. ...

Report on bus transfer. II. Computer modeling for bus transfer studies
  • Citing Article
  • October 1990

IEEE Transactions on Energy Conversion