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Lithium battery cells are commonly modeled using an equivalent circuit with large lookup tables for each circuit element, allowing flexibility for the model to match measured data as close as possible. Pulse discharge curves and charge curves are collected experimentally to characterize the battery performance at various operating points. It can be extremely difficult to fit the simulation model to...
State of Charge (SoC) is the most important parameter to be estimated on a Battery Management System (BMS). Improper SoC management can cause faster battery degradation, reduce its operational lifetime and, on extreme cases of overcharge, it may lead to an explosion. In addition, batteries are complex electrochemical systems, and both the electrical components and chemical reactions vary significantly...
This paper presents a low cost Battery Information System, based on intelligent modules to be embedded inside single battery cells. The module design is cost-optimized, including only minimal functionality to uniquely identify each cell, and measure voltage and temperature. Current measurement is accomplished be an addition module added to each series-connected battery stack, avoiding unnecessary...
Partial discharges measurements are an important tool for the determination of the degradation level of high voltage apparatus. If partial discharge is found in insulating systems then it is important to identify its character, i.e. internal discharge, surface discharge, corona etc. The aim of this paper is present a methodology for the generation of partial signals with different characteristics...
Partial discharge (PD) measurement is an established high voltage insulation monitoring technique used to facilitate the detection of incipient faults in high voltage apparatus. Based on the great importance of the power system, is constant the research about the nature and characteristics of PD sources. A low-cost, free-standing, radiometric, partial discharge wireless sensor network (PD WSN) is...
Partial discharge measurement has long been used to evaluate insulation system design and as a quality assurance test for High Voltage (HV) apparatus prior to installation. PD is characterized by high frequency current pulses originating in gas ionization processes when damaged insulation is submitted to high values of electric field. PD process modeling allows a better understanding of the phenomena...
This work aims at proposing a methodology to perform an experimental evaluation of energized grounding grid systems, subjected to current impulses. By using an impulse generator (80 kJ/100 kV) impulses were generated 8/20 μs waveforms that were injected into the soil through a copper coated steel electrode. The applied voltage signal and the propagated signal in the soil were acquired by using a digital...
Insulation failure in power systems plant may be caused by manufacturing defects or by electrical, mechanical, thermal and chemical process which occur during operation. These processes create defects, including voids in solids, which locally reduces the dielectric insulation strength. Electrical discharge may occur in these regions of reduced dielectric strength without discharge occuring in the...
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