Some Observations on Arc Potentials in Hydrogen Thyratron Pulse Discharges

1972 ◽  
Vol 50 (12) ◽  
pp. 1337-1345 ◽  
Author(s):  
R. J. Armstrong
Keyword(s):  
High Power ◽  
Electrical Discharge ◽  
Experimental Results ◽  
Relaxation Properties ◽  
Arc Voltage ◽  
Electrons And Ions

The arc voltage in high power hydrogen thyratrons has been measured, under a variety of pulse and DC conditions. The valve is found to be higher under pulse conditions than under DC conditions. An explanation, similar to that invoked by Sugawara and Gregory in a different situation, is found to give some agreement with the experimental results. This explanation depends on the relaxation properties of the electrons and ions in an electrical discharge or plasma.

A STUDY OF UNDERWATER PROPAGATION FROM A HIGH POWER ELECTRICAL DISCHARGE

1963 ◽  
Author(s):  
M. J. Larsen ◽  
M. M. Newman ◽  
O. R. Gano
Keyword(s):  
High Power ◽  
Electrical Discharge

Research on Racing Loss of a High-Power Hydraulic Retarder

2014 ◽  
Vol 541-542 ◽  
pp. 574-578
Author(s):  
Hui Yuan Li ◽  
Hai Ji ◽  
Xu Qing Qin ◽  
Chao Wu ◽  
Yun Hu Wang
Keyword(s):  
High Power ◽  
Power Loss ◽  
Cfd Simulation ◽  
Experimental Results ◽  
Baffle Plate ◽  
Simulation Results ◽  
Hydraulic Retarder

This paper aims at the requirement of tracklayer gearing controlling racing power loss (for short racing loss), analyzed mechanism of generating racing loss of a high-power hydraulic retarder. By adding different number of baffle-plate equipment, racing loss was reduced. Using CFD technology, this paper studied contrastively the racing loss of hydraulic retarder in different condition, and compared with experiment result. The result indicated that the racing loss reduced obviously after fixing baffle-plate equipment, and the CFD simulation results agree well with the experimental results.

scholarly journals Study on Boost Converters with High Power-Density for Hydrogen-Fuel-Cell Hybrid Railway System

Electronics ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 771
Author(s):  
Han-Shin Youn ◽  
Duk-Hyeon Yun ◽  
Woo-Seok Lee ◽  
Il-Oun Lee
Keyword(s):  
Fuel Cell ◽  
Power Density ◽  
High Power ◽  
Boost Converter ◽  
Experimental Results ◽  
Current Response ◽  
Hydrogen Fuel Cell ◽  
Hydrogen Fuel ◽  
Boost Converters ◽  
Railway System

Step-up DC/DC converters are needed generally for the hydrogen-fuel-cell (HFC) hybrid railway system since the HFC has difficulty directly generating a high link voltage of over 1500 V for the high-power capacity inverter to drive the traction motor in the vehicle. These step-up DC/DC converters demand a high conversion efficiency with low weight and volume, due to the limited space in vehicle. In this paper, step-up DC/DC converters are presented and are evaluated for the HFC hybrid railway system. By choosing the interleaved boost converter and the 3-level boost converter as promising candidates, characteristics and features of both converters are presented through the analysis of the operational principles. In addition, the optimal design methods and results of boost inductor, output capacitor, and power semiconductor devices are presented based on theoretical analysis and a real design specification for the HFC hybrid railway system. Moreover, an optimal digital control design in terms of dynamic current response and reliability, such as current-balance or voltage-balance controls, is presented in this paper. In order to verify the analysis and design results, prototypes of both converters with the 600 V input and 1200 V/20 kW output specifications are constructed and the performance of the interleaved and 3-level boost converters are demonstrated through the experimental results. The experimental results show that the 3-level boost converter is more suitable for the HFC hybrid railway system in the sense of efficiency, power-density, and dynamic current response.

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