The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper conducts an investigation on the sensitivity of incident energy to critical arc flash parameters. In order to perform such task, the authors explore the causes of arc flash by presenting the underlying concepts associated with short-circuit fault analysis, and use these concepts to model and simulate arc flash scenarios by employing IEEE 1584 standard. An electrical system representative...
This paper attempts to investigate and analyze the electrical characteristics present on the power grid when an open-phase event occurs at an off-site transformer. In order to conduct such task, this paper uses transformer, load, and connection data obtained from a real power plant to simulate several different power system configurations and analyzes various model responses in EMTP-RV software. Several...
This paper presents a study on naturally aged timing relays. This study employs thermally accelerated aging method. This method includes various inspection, surveillance and monitoring (ISM) tests to identify and characterize the process of material and component degradation during the service which leads to the estimation of service life for the target relays. After applying the aforementioned tests,...
Frequency Response has been the focus of increased attention and analysis recently due to its importance to the reliability of the network. The models used by the utilities proved to be insufficient and the inability to duplicate events using the existing models and databases has led to several initiatives to address these shortfalls. In this work, the effect of the dead-band in the governor/turbine...
Electrical system dynamic modeling of associated components such as generators, turbines and other drivers, excitation systems, governors, and rotating loads requires countless engineering man-hours to determine the models' necessary parameters. Therefore, any reduction or simplification of the component dynamic models that can be performed, while assuring statistically equivalent analyses results,...
Since power systems have large scale, nonlinear parameters, including uncertainty, researchers have presented many methods for model simplification. Voltage dip and transients are known for their importance in dynamic studies and as a result of short circuits or starting a large induction motor, generator excitation systems come into effect in order to compensate voltage oscillations and voltage dips...
The Under Excitation Limiter (UEL) has been introduced in the excitation systems mostly to prevent the loss of synchronism of generators and also prevent exceeding machine under-excited capability limit which otherwise leads to overheating of the stator of the machine and also challenges different part of generator protection and control system. In this paper, its effect on the modeling of Diesel...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.