Advanced high frequency partial discharge measuring system

This report explains the Advanced Partial Discharge Measuring System in ASU's High Voltage Laboratory and presents some of the results obtained using the setup. While in operation an insulation is subjected to wide ranging temperature and voltage stresses. Hence, it is necessary to study the effect of temperature on the behavior of partial discharges in an insulation. The setup described in this report can be used to test samples at temperatures ranging from -50 C to 200 C. The aim of conducting the tests described herein is to be able to predict the behavior of an insulation under different operating conditions in addition to being able to predict the possibility of failure

Investigation of Fuel Cell System Performance and Operation: A Fuel Cell as a Practical Distributed Generator

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Breakdown Voltage of Compressed Sulfur Hexafluoride (SF 6 ) at Very Low Frequency / Low Frequency (30 kHz)

ABSTRACT The U.S. Navy is interested in evaluating the dielectric performance of SF 6 at 30 kHz in order to develop optimal bushing designs and to ensure reliable operation for the Very Low Frequency/ Low Frequency (VLF/LF) transmitting stations. The breakdown experiments of compressed SF 6 at 30 kHz in the pressure range of 1-5 atm were conducted in both the uniform field (plane-plane gap) and the non-uniform field (rod-plane gap). To understand the impact of pressure on the breakdown voltage of SF 6 at VLF/LF, empirical models of the dielectric strength of SF 6 were derived based on the experimental data and regression analysis. The pressure correction factors that present the correlation between the breakdown voltage of SF 6 at VLF/LF and that of air at 50/60 Hz were calculated. These empirical models provide an effective way to use the extensively documented breakdown voltage data of air at 60 Hz to evaluate the dielectric performance of SF 6 for the design of VLF/LF high voltage equipment. In addition, several breakdown experiments and similar regression analysis of air at 30 kHz were conducted as well. A ratio of the breakdown voltage of SF 6 to that of air at VLF/LF was calculated, from which a significant difference between the uniform gap and the non-uniform gap was observed. All the models and values provide useful information to evaluate and predict the performance of the bushings in practice

Johnny Madrid, Researcher

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Electrical energy conversion and transport: an interactive computer-based approach

Provides relevant material for engineering students and practicing engineers who want to learn the basics of electrical power transmission, generation, and usage This Second Edition of Electrical Energy Conversion and Transport is thoroughly updated to address the recent environmental effects of electric power generation and transmission, which have become more important in conjunction with the deregulation of the industry. The maintenance and development of the electrical energy generation and transport industry requires well-trained engineers who are able to use mod

A Novel Method to Test the Quality of ADSS Fiber Optic Cables Installed in Transmission Lines

Dry-hand arc resistance determines the quality of fiber optic cable insulation materials. Three different brands of ADSS fiber optic cable qualities are determined with IEEE 1222 standard test method. Results give a ranking of the cables. During the experiment, it is noticed that randomly spread water droplets are a factor for the results. Therefore, the same cables are tested with another standard method, the well-known ASTM D2303 standard inclined plane test method. The duration of the test is shorter than IEEE 1222 standard test method and results show the same high ranked cable. However, this method does not represent the actual filed conditions. A new test method is proposed, which is the combination of the two standard test methods. Test uses the circuit parameters of IEEE 1222 standard and it uses the test environment of ASTM D2303 standard. After testing one type of cable, the test is interrupted since the duration of the test is much longer than the other two methods. All the three test methods show that the wetting process of the samples is not the point of determination for dry-hand arc resistance. Major determination is the current limitation