This article presents a new model to represent transmission lines including the frequency depende... more This article presents a new model to represent transmission lines including the frequency dependence of longitudinal parameters. The model uses the natural modes, for ideally transposed lines, and ‘quasi-modes’ for non-transposed lines, and is applied to lines that have a vertical symmetry plane. The line is represented through π-circuits, with one π-circuit for each mode. The transformation matrix is modeled using ideal transformers. The model is described for three-phase lines, dc lines, double three-phase lines and six phase lines. A 440 kV three-phase transmission line illustrates it and is compared with a frequency dependent EMTP line model, the Semlyen one.
A new switched reluctance (SR) fuel/lube (F/L) pump system has been developed for a gas turbine e... more A new switched reluctance (SR) fuel/lube (F/L) pump system has been developed for a gas turbine engine application. The system is rated at 5 HP, 270 V DC, 12.5 krpm maximum operating speed, and consists of a SR machine mounted on the F/L pump shaft, an inverter, and an electronic controller. This paper focuses on the design, implementation, and performance of the system. The system can use one of two methods for rotor position sensing, either a resolver or electronic position sensing (EPS). The F/L pump system has undergone extensive performance testing with the resolver. Testing is underway using electronic position sensing. Test results are given to validate the system design and compare the performance using both approaches to position sensing. System efficiency is about 82 percent at full load
T HE MEXICAN-AMERICAN FAMILY is typically characterized as a large and cohesive kin group em-brac... more T HE MEXICAN-AMERICAN FAMILY is typically characterized as a large and cohesive kin group em-bracing both lineal and collateral relatives (dark 1959; Madsen 1964a; Rubel 1966). Ties beyond the nuclear family are strong and extensive, and reciprocal rights and duties are ...
This article presents a new model to represent transmission lines including the frequency depende... more This article presents a new model to represent transmission lines including the frequency dependence of longitudinal parameters. The model uses the natural modes, for ideally transposed lines, and ‘quasi-modes’ for non-transposed lines, and is applied to lines that have a vertical symmetry plane. The line is represented through π-circuits, with one π-circuit for each mode. The transformation matrix is modeled using ideal transformers. The model is described for three-phase lines, dc lines, double three-phase lines and six phase lines. A 440 kV three-phase transmission line illustrates it and is compared with a frequency dependent EMTP line model, the Semlyen one.
A new switched reluctance (SR) fuel/lube (F/L) pump system has been developed for a gas turbine e... more A new switched reluctance (SR) fuel/lube (F/L) pump system has been developed for a gas turbine engine application. The system is rated at 5 HP, 270 V DC, 12.5 krpm maximum operating speed, and consists of a SR machine mounted on the F/L pump shaft, an inverter, and an electronic controller. This paper focuses on the design, implementation, and performance of the system. The system can use one of two methods for rotor position sensing, either a resolver or electronic position sensing (EPS). The F/L pump system has undergone extensive performance testing with the resolver. Testing is underway using electronic position sensing. Test results are given to validate the system design and compare the performance using both approaches to position sensing. System efficiency is about 82 percent at full load
T HE MEXICAN-AMERICAN FAMILY is typically characterized as a large and cohesive kin group em-brac... more T HE MEXICAN-AMERICAN FAMILY is typically characterized as a large and cohesive kin group em-bracing both lineal and collateral relatives (dark 1959; Madsen 1964a; Rubel 1966). Ties beyond the nuclear family are strong and extensive, and reciprocal rights and duties are ...
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Papers by carlos manuel