1,721,069 research outputs found
Method and measurement set up for the evaluation of the performance of UPS in presence of network outages
No full textDesign and Metrological Characterization of a low cost Webcam-Based System to evaluate the reliability of LEDs vs. Temperature
No full textElectric-power quality measurement under distorted conditions: are they utopia or reality
No full textCharacterization of a VI-based instrument for measurements under distorted conditions and unbalance
No full textMisure e Fidatezza; Sistemi riparabili
No full textFor repairable devices, such as systems, sub-systems, etc., availability requirements
have to be defined. Availability takes into account, in fact, not only
the concept of reliability, extensively discussed in previous papers, but integrates
this concept with information on the repair and restoration of the performed
functions, with the activities associated to them. In other words,
given a device, it is possible to estimate the fault status and, consequently,
the related maintenance issues
Analysis of MV Cable Joints Equivalent Impedance and its Variation vs. Temperature
No full textThis paper presents a mathematical study along with the first preliminary results to correlate the equivalent impedance of a medium voltage cable-joint to its Tangent Delta value (i.e. its Dissipation Factor value). The failures of cable joints are a broad and current topic which is being investigated inside the electric engineering community. In the paper the results of both the study carried out to determine correlation between the joint impedance and its Tangent Delta value and the variation of this last one vs. temperature are presented
A Methodology to Analyze and Evaluate the Uncertainty Propagation due to Temperature and Frequency and Design Optimization for EMC Testing Instrumentation
Full text linkThis paper presents a study and proposes a new methodology to analyze, evaluate and reduce the overall uncertainty of instrumentations for EMC measurements. For the scope of this work, the front end of a commercial EMI receiver is chosen and variations due to tolerances, temperature and frequency response of the system are evaluated. This paper illustrates in detail how to treat each block composing the model by analyzing each discrete component, and how to evaluate their influence on the measurand. Since a model can have hundreds or even thousands of parameters, the probability distribution functions (PDFs) of some variable might be unknown. So, a method that allows to obtain in a fast and easy way the uncertainty of the measurement despite having so many variables, to then being able to evaluate the influence of each component on the measurand, is necessary for a correct design. In this way, it will be possible to indicate which discrete components have the most influence on the measurand and thus set the maximum tolerances allowed and being able to design a cost-effective solution. Furthermore, this works presents a methodology which can easily be extended and applied to estimate and compute the uncertainty for electromagnetic interferences, energy storage systems (ESS), energy production, electric machines, electric transports and power plants in genera
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