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This paper discussed the tuning process of the power system stabilizer (PSS) for a nuclear turbine-generator excitation system. By measuring the non-compensated phase-frequency characteristic of the excitation without PSS, and through calculation and critical gain test, the PSS parameters are determined. Through step response and anti-regulation experiment, the effectiveness of the PSS is verified.
Static excitation systems have been widely used in large synchronous generators and field flashing is needed to set the initial electromagnetic field for the generator voltage buildup. In order to meet the requirements for the large synchronous generator field flashing, the selection of the field flashing circuit and rotor winding time constant, the coordinated control of the field flashing system...
As an important part of the modern generator excitation system, the power rectifier cabinet accommodates the silicon-controlled rectifiers (SCRs) whose junction temperature should be kept within limit at all times. For excitation systems of 1000MW steam turbine generator and 700WM hydro generator, the required output DC current for each rectifier cabinet can be as high as 4,000A, which raises challenge...
In this paper the characteristics of the static self shunt excitation system for giant hydro generator are introduced. Each component is analyzed on what should be addressed in the design, including the automatic voltage regulator, the silicon-controlled rectifier (SCR) cabinet, the de-excitation control and rotor overvoltage protection circuit and the excitation transformer configured for the giant...
The process of electrostatic liquid spraying involves a combination of hydrodynamics, aerodynamics and electrostatics. Many parameters affect the process such as atomizing air pressure, liquid flow rate, nozzle-to-target distance, droplet size, charge-to-mass ratio, etc. The mechanical portion can be directly modeled with the computational fluid dynamics software, FLUENT. Although this software does...
In liquid spraying, the terms conduction and induction charging are often assumed to be synonymous and to differ only in the polarity of charge. In this paper, a comparison is made between these two methods with regard to the charging mechanism, electric field distribution, electrode wetting, energy conversion and space charge effects for a two-electrode and a three-electrode geometry. It is shown...
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