How VFDs Affect Genset Sizing
ثبت نشده
چکیده
Each motor load, whether that of a 30-kW pump or a 500-kW chiller, represents only a small percentage of the grid’s capacity; the mechanical inertia in the grid more than compensates for the transient electrical effect caused by starting either of these motors. The increased power consumption may create a temporary voltage drop that’s “felt” locally by other loads in the building. But the relative capacity of the utility
منابع مشابه
On Using Storage and Genset for Mitigating Power Grid Failures
Although modern society is critically reliant on power grids, even modern power grids are subject to unavoidable outages due to storms, lightning strikes, and equipment failures. The situation in developing countries is even worse, with frequent load shedding lasting several hours a day due to unreliable generation. We study the use of battery storage to allow a set of homes in a single residen...
متن کاملA review & analysis of harmonics in Variable Frequency Drives (VFDs)
In this manuscript, the author has tried to analyze a study of Variable Frequency Drives. Variable frequency drives are energy saving drives. But they generate harmonics generates. Harmonics introduced by any means affect the performance parameters of any system The presence of harmonics is the system for a long duration & that, too, of higher order affect the various parameters in a Power dist...
متن کاملVigabatrin and Visual Field Defects in Pediatric Epilepsy Patients
We studied the prevalence, type and severity of vigabatrin (VGB)-attributed visual field defects (VFDs), and used these data to assess the associated risk factors in pediatric patients. Medical records were retrospectively reviewed for 67 pediatric patients who received VGB alone or in combination with other antiepileptic drugs, and who had undergone visual field examinations using a Humphrey v...
متن کاملContralesional Trunk Rotation Dissociates Real vs. Pseudo-Visual Field Defects due to Visual Neglect in Stroke Patients
In stroke patients, the clinical presentation of visual field defects (VFDs) is frequently accompanied by visual neglect, i.e., the inability to attend and respond to the contralesional space. However, the diagnostic discrimination between the lack of reactions to contralesional stimuli due to VFDs or visual neglect is challenging during clinical examination. This discrimination is particularly...
متن کاملInvolvement of the visual pathway is not a risk factor of visual field deficits in patients with occipital arteriovenous malformations: an fMRI study
Background: Occipital arteriovenous malformations (AVMs) are still one of neurosurgery’s most intriguing and challenging pathologies. In this study, we reviewed our series of patients with occipital AVMs admitted in Beijing Tiantan Hospital from June 2013 through January 2015 and attempted to evaluate the risk factors of visual field deficits (VFDs) in these patients at presentation. Methods: F...
متن کامل