Results 1 to 10 of about 1,837,906 (265)

Frequency Response Analysis of Buck-Boost Inverter

Mìkrosistemi, Elektronìka ta Akustika, 2019
The paper deals with processes analysis in inverter circuits. These processes are described by differential equations with periodical coefficients. Since control signals and voltages operating in an inverter circuit are independent theirs frequencies are
Igor Yevheniiovych Korotyeyev
doaj   +1 more source

Understanding the Influence of Power Transformer Faults on the Frequency Response Signature Using Simulation Analysis and Statistical Indicators

IEEE Access, 2021
Frequency Response Analysis (FRA) is the most reliable technique currently used to evaluate the mechanical integrity of power transformers. While the measurement devices have been well developed over the past two decades, interpretation of the FRA ...
Salem Mgammal Awadh Nasser Al-Ameri, Muhammad Saufi Kamarudin, Mohd Fairouz Mohd Yousof, Ali A. Salem, Fahd A. Banakhr, Mohamed I. Mosaad, A. Abu-Siada   +6 more
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Frequency Response Analysis Tool [PDF]

, 2014
Frequency response has received a lot of attention in recent years at the national level, which culminated in the development and approval of North American Electricity Reliability Corporation (NERC) BAL-003-1 Frequency Response and Frequency Bias Setting Reliability Standard.
Pavel V. Etingov, Dmitry Kosterev, T. Dai   +2 more
openaire   +1 more source

Transformer winding type recognition based on FRA data and a support vector machine model

High Voltage, 2020
Frequency response analysis (FRA) is regarded as the most effective technique to detect mechanical faults of transformers. Over the years, FRA measurement data have been collected by utilities into transformer asset databases.
Xiaozhou Mao, Zhongdong Wang, Peter Crossley, Paul Jarman, Andrew Fieldsend-Roxborough, Gordon Wilson   +5 more
doaj   +1 more source

On the treatment of connecting conditions and the choice of admissible functions in energy method to investigate band gap characteristics of periodic beams

Mechanical Engineering Journal
Periodic structures are known to have specific frequency ranges called band gaps, where the transmission of elastic waves is suppressed. Research on band gap formation in mechanical structures has recently gained considerable attention, and there is a ...
Yuta KONNO, Takahiro TOMIOKA
doaj   +1 more source

Hybrid k-means-PSO Technique for Transformer Insulation Moisture Determination in the Production Stage Based on Frequency Response Analysis

Iranian Journal of Electrical and Electronic Engineering, 2022
Moisture in the transformer insulation can shorten its life. There are many methods for detecting humidity in transformer paper insulation. One of the methods used in the factory to evaluate the drying process of transformer insulation and determine its ...
M. Bigdeli
doaj  

Online High Frequency Impedance Identification Method of Inverter-Fed Electrical Machines for Stator Health Monitoring

Applied Sciences
In electric powertrain traction applications, the adopted trend to improve the performance and efficiency of electromechanical power conversion systems is to increase supply voltages and inverter switching frequencies.
Jérémy Creux, Najla Haje Obeid, Thierry Boileau, Farid Meibody-Tabar   +3 more
doaj   +1 more source

The validation of an aerospace structure through the sine vibration analysis [PDF]

INCAS Bulletin, 2018
Sinusoidal vibrations represent an ideal case. Technically, it is quite hard to generate pure sinusoidal vibrations without containing other spectral components, called harmonics.
Cristina-Diana BRATU, Ionut-Cosmin ONCESCU, Ion DIMA, Alexandra Raluca PETRE   +3 more
doaj   +1 more source

Design Improvement of a Semi-submersible Floating Offshore Wind Turbines through Frequency-domain Load Analyses

한국해양공학회지
The purpose of this study is to analyze the differences in motion response performances according to the design variables of semi-submersible substructures supporting floating offshore wind turbines (FOWTs) and propose an improved design.
Soo Bin Lee, Joonmo Choung
doaj   +1 more source

Elegant procedure to estimate series capacitance of a uniform transformer winding from its measured FRA: implementable on existing FRA instruments

High Voltage, 2020
A simple procedure to estimate series capacitance of a uniform transformer winding from its measured frequency response analysis (FRA) and shunt capacitance is presented. Unlike previously published approaches, this method does not involve any cumbersome
Ashiq Muhammed, Lakshminarayana Satish, Udaya Kumar, Udaya Kumar   +3 more
doaj   +1 more source