Heat loss analysis for an oceanaut

Call number: LD2668 .R4 1965 A24

Hybrid, high speed fault detection based on instantaneous line voltages

This fault detection scheme is based on sampling the instantaneous phase voltages and checking their sum and magnitude against a specified voltage. Faults on the system cause unbalances and distortion of the phase voltages and currents. The currents and voltages change in magnitude and/or phase position with respect to the prefault condition. The measurement of this deviation from the normal condition indicates a fault. This scheme detected the fault within one-half cycle (8 milliseconds) in the laboratory. It is shown that this scheme is simpler and faster to implement than conventional detection schemes

Digital model of a synchronous generator excitation system

This thesis develops a simplified and logical simulation model for an amplidyne excitation system for a synchronous generator with an automatic voltage regulator. The non-transfer function representation using field determined parameters including variable inductance and machine saturation was used to reduce the computing time for the stability analysis. The simulation of the above model was programmed in Fortran, The simulation results are compared with actual data taken in the laboratory. From the results it was observed that steady state voltage for the model and the actual system was within 3. 0%. But the transient response of the model and actual system did not agree