scholarly journals Electrolytic capacitor life time calculation under varying operating conditions

2020 ◽  
Vol 22 (3) ◽  
pp. 721-734
Author(s):  
Erlan J. Dzhunusbekov ◽  
Sagi A. Orazbayev
Keyword(s):  
Life Time ◽  
Operating Conditions ◽  
Electrolytic Capacitor ◽  
Time Calculation

scholarly journals Life-Time Calculation of Spiroid Gearbox in the Drive of Cable-Assembly Mechanism of the Electric Loader

2017 ◽  
Vol 20 (2) ◽  
pp. 24
Author(s):  
V N Anferov ◽  
A P Tkachuk ◽  
A V Zaitsev
Keyword(s):  
Life Time ◽  
Assembly Mechanism ◽  
Time Calculation ◽  
Electric Loader ◽  
Cable Assembly

Рассмотрен метод определения ресурса спироидного редуктора в приводе кабелесборочного механизма электропогрузчика. Метод основан на учете конкретных условий эксплуатации электропогрузчикав процессе выполнения погрузочно-разгрузочных работ и, как следствие, режимов нагружения кабелесборочного механизма. Электропогрузчики широко применяются в промышленности, на транспорте, в строительстве и горном производстве при проведении погрузочно-разгрузочных работ. Одним из самых распространенных видов являются универсальные электропогрузчикис приводом от аккумуляторных батарей. Наиболее часто их используют для погрузочных и разгрузочных работ в крытых складских помещениях. В результате расчетов получен прогнозируемый ресурс спироидного мотор-редуктора кабелесборочного механизма при постоянном и переменном режимах нагружения, с учетом предельного износа зубьев спироидного колеса и продолжительности цикла работы кабелесборочного механизма. Метод учитывает основные характеристики процесса выполнения рабочего цикла электропогрузчиком при транспортировании, погрузке и выгрузке грузов. Данные характеристики учитываются соответствующей усредненной тахограммой рабочего цикла электропогрузчика. Результаты расчетов прогнозируемого ресурса по данному методу позволяют на этапах проектирования кабелесборочного механизма более точно спрогнозировать ресурс спироидного мотор-редуктора с учетом режима нагружения, а также условий эксплуатации электропогрузчика.

scholarly journals A New Data-Driven Approach for Power IGBT Remaining Useful Life Estimation Based On Feature Reduction Technique and Neural Network

Electronics ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 1571
Author(s):  
Adla Ismail ◽  
Lotfi Saidi ◽  
Mounir Sayadi ◽  
Mohamed Benbouzid
Keyword(s):  
Neural Network ◽  
Accelerated Aging ◽  
Principal Component ◽  
Life Time ◽  
Time Domain Analysis ◽  
Energy System ◽  
Remaining Useful Life ◽  
Feature Reduction ◽  
Operating Conditions ◽  
Useful Life

The insulated gate bipolar transistor (IGBT) is a crucial component of power converters (PCVs) and is commonly used in several PCVs topologies. On the other hand, the investigation and the study of the IGBT component show several changes within its behavior and lifetime, while this component is highly influenced by the operating conditions. Indeed, the monitoring of this component is necessary to minimize unexpected downtime of the wind energy system (WES). However, an accurate prediction of IGBTs remaining useful life (RUL) is the key enabler for life-time-optimized operation. Consequently, this work proposes a new prognostic approach for online IGBTs monitoring that adopts the time-domain analysis to extract useful information that is used as an input in the generation of the health indicator. Moreover, this approach is based on combining both of principal component analysis (PCA) technique and the feedforward neural network (FFNN) technique. PCA is used to reduce features extracted from IGBTs and the FFNN is implemented to achieve online regression of the trend parameter obtained from the PCA technique. To investigate and evaluate the performance of our idea we used the NASA Ames Laboratory Prognostics Center of Excellence IGBTs accelerated aging database. Finally, the achieved results clearly show the strength of the new trend parameter for IGBTs RUL prediction. The most notable strong correlation within the proposed approach is in relation to accuracy value, with an acceptable average accuracy rate of 60.4%.

scholarly journals Changes of Insulation Properties of Photovoltaic Cables Caused by Ageing Treatment

2020 ◽  
Vol 6 (1) ◽  
pp. 6-9 ◽  
Author(s):  
Juraj Packa ◽  
Vladimir Kujan ◽  
Daniel Štrkula ◽  
Vladimír Šály ◽  
Milan Perný
Keyword(s):  
Power Plants ◽  
Real Life ◽  
Life Time ◽  
Operating Conditions ◽  
Solar Panels ◽  
Font Size ◽  
Long Term Stability ◽  
Cable Systems

<span style="font-family: 'Times New Roman',serif; font-size: 10pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;" lang="EN-US">An important part of the photovoltaic power plants are cable systems. The dielectric properties of cables, reliability and durability depend on quality of production processes, operating conditions and degradation factors, as well. Expected lifetime of cable systems is more than 20-30 years in general. Their failure free operation and long-term stability of properties has a direct impact on the economic return of the investments. According to our experiences the tests in compliance with valid standards are not adequate to verify real life time during operation. Photovoltaic cables intended for use in outdoor applications for the connection between the solar panels and possible connection between panels and inverter were chosen for our experiments. <span style="-ms-layout-grid-mode: line;">The changes </span>of insulation resistance and breakdown voltage caused by some degradation factors, mainly water, are presented. This research was inspired by real failure in operation.</span>

Pengaruh penambahan propana dalam bahan bakar terhadap karakteristik sel tunam oksida padat

2018 ◽  
Vol 4 (1) ◽  
pp. 159
Author(s):  
Isdiriayani Nurdin ◽  
Astrilia Damayanti ◽  
Ocktavianus Lede M. R. ◽  
Pramujo Widiatmoko
Keyword(s):  
Cell Voltage ◽  
Life Time ◽  
Operating Conditions ◽  
Optimum Operating ◽  
High Alumina ◽  
Test Results ◽  
Fuel Gas ◽  
Aisi 304 ◽  
Negative Effect ◽  
Main Components

AbstractFuel cell is a renewable energy source that does not create any negative effect to the environment. One of the advantage of the Solid Oxide Fuel Cell (SOFC) is its tolerance to fuel contaminants. This research is aimed to study the effect of propane addition into fuel gas on SOFC'S characters. SOFC tested during this research consists of main components functioned as feed gas distributor, and insulator made of asbestos and C-12 high alumina. SOFC's characters studied in this research including optimum operating conditions, polarization, and expected life time of the cell. The test results show that optimum operating conditions of tested SOFC are 700ºC, 45 mL H/minute and 225 mL air/minute. Cell using 22,2 %-vol propane in the fuel gives a longer lifetime, a smaller maximum current, and a higher voltage efficiency than such using hydrogen only as fuel. Propane concentration in fuel gas up to 22,2 %-vol has not any significant influence to cell voltage. The obtained polarization curve reveals that cell reactions are mass transfer controlled.Keywords: SOFC, Life Time, Polarization, EfficiencyAbstrakSel tunam oksida padat (SOFC) merupakan salah satu sumber energi terbarukan yang tidak menimbulkan dampak negatif terhadap lingkungan dan toleran terhadap kontaminan dalam bahan bakar. Tujuan percobaan ini adalah mempelajari pengaruh penambahan propana dalam bahan bakar terhadap karakteristik SOFC. Pada penelitian ini SOFC yang diuji terdiri dari komponen utama sel tipe ASC1 buatan lnDEC B.V,dilengkapi dengan cangkang terbuat dari stainless steel tipe AISI 304, yang merangkap sebagai distributor gas umpan, dan isolator dari bahan asbes serta semen tahan api tipe C-12 high alumina. Karakter SOFC yang dipelajari pada penelitian ini meliputi kondisi operasi optimum, polarisasi, dan umur set. Hasil percobaan menunjukkan bahwa operasi SOFC optimal pada temperatur 700ºC dengan laju alir H2, 45 mL/menit dan udara 225 mL/menit. Konsentrasi propana dalam bahan bakar 22,2 %- v memberikan umur sel yang lebih panjang, arus maksimum yang lebih kecil, dan efisiensi tegangan yang lebih besar daripada dengan bahan bakar gas hidrogen saja. Konsentrasi propana dalam gas bahan bakar sampai dengan 22,2 %-v tidak mempengaruhi tegangan sel. Kurva polarisasi yang diperoleh menunjukkan bahwa reaksi sel terkendali olehperpindahan  massa.Kata Kunci : SOFC, Umur, Polarisasi, Efisiensi

Accelerated life-time test of MEA durability under vehicle operating conditions in PEM fuel cell

2017 ◽  
Vol 11 (3) ◽  
pp. 326-333 ◽  
Author(s):  
Tian Tian ◽  
Jianjun Tang ◽  
Wei Guo ◽  
Mu Pan
Keyword(s):  
Fuel Cell ◽  
Life Time ◽  
Pem Fuel Cell ◽  
Operating Conditions ◽  
Accelerated Life ◽  
Time Test

Failure Prediction Model and ESR Modeling of Electrolytic Capacitor With Application to Predictive Maintenance

2015 ◽  
Author(s):  
Hadi Malek ◽  
Sara Dadras ◽  
YangQuan Chen
Keyword(s):  
Life Span ◽  
Fractional Order ◽  
Prediction Models ◽  
Failure Time ◽  
Life Time ◽  
Predictive Maintenance ◽  
Electrolytic Capacitor ◽  
Equivalent Series Resistance ◽  
Time Prediction ◽  
Actual Life

Being one of the most used passive components in power electronics, electrolytic capacitors have the shortest life span due to their wear-out failure which is mainly caused by vaporization and deterioration of capacitor electrolyte. Knowing these two phenomena increase Equivalent Series Resistance (ESR) of the capacitor, tracking ESR value over the system operating time can be a good indicator for state of health of an electrolytic capacitor. In order to set the maintenance schedule, various ESR monitoring algorithms computing remaining time before failure have been investigated in literature. These real-time algorithms use classical models for ESR and life-time estimation which are not precise enough and leads the maintenance program to be either risky if the prediction is more than the actual life-time or more expensive if it is much less than the actual life span. This paper presents a generalized equivalent model using fractional order element for electrolytic capacitor to estimate the ESR and impedance of faultless running capacitor. Unlike other existing fractional order models, proposed model considers a fractional order dynamic only in the dielectric losses and the terminal capacitor remains integer order as observed in actual capacitor’s behavior. Furthermore, a novel failure predictive model using Mittage-Leffler function is proposed to track the ESR increment due to aging of the capacitor and estimate the failure time based on the information which are provided through ESR monitoring system. Using this model increase the life-time prediction accuracy. Hence the predictive maintenance of the system with capacitors nearing their failure time can be set more precisely. These two fractional order models are compared against classical ESR and life-time prediction models to illustrate the enhanced performances of the proposed models.

Comparison of Aluminum Electrolytic Capacitor Lifetimes Using Accelerated Life Testing

2014 ◽  
Vol 2014 (1) ◽  
pp. 000662-000667 ◽  
Author(s):  
Stephani Gulbrandsen ◽  
Joelle Arnold ◽  
Greg Caswell ◽  
Ken Cartmill
Keyword(s):  
Weight Loss ◽  
Operating Conditions ◽  
Accelerated Life Test ◽  
Electrolytic Capacitor ◽  
Time To Failure ◽  
Equivalent Series Resistance ◽  
Aluminum Electrolytic Capacitor ◽  
Critical Weight ◽  
Accelerated Life ◽  
Speed Up

This research compared the lifetime of similar aluminum electrolytic capacitors from different manufacturers using an accelerated life test, which consisted of critical weight loss testing and rate of weight loss testing. In critical weight loss testing, capacitors are perforated to speed up electrolyte evaporation and the equivalent series resistance (ESR) and weight are measured periodically to determine their relationship. In rate of weight loss testing, capacitors are subjected to final operating conditions (i.e. voltage and ripple current are applied) and the weight is periodically measured over the course of 500 hours. After test completion the relationship between ESR and weight loss is used to calculate the critical weight loss that occurs at datasheet-defined failure, which is typically a 200% increase in ESR. The rate of weight loss is extrapolated to the critical weight to estimate a time to failure that can be compared to other capacitors tested using the same accelerated approach. In this research, testing compared 450 V, 68 μF capacitors from Manufacturer A and Manufacturer B, and results indicated Manufacturer A had a significantly longer lifetime. Therefore, capacitors from Manufacturer A are more reliable than capacitors from Manufacturer B.

A Study of a Turbine-Generator System for Low-Head Hydropower

1985 ◽  
Author(s):  
R. R. Mankbadi ◽  
S. Mikhail
Keyword(s):  
Interest Rates ◽  
Cost Benefit ◽  
Life Time ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Design Parameters ◽  
Turbine Generator ◽  
Generator System ◽  
Wide Range ◽  
Low Head

A method is outlined for determining the optimum operating conditions of a turbine-generator unit installed across a low-head irrigation structure for electrical power generation. For a given regulator’s characteristic, the unit’s rated power and design parameters are determined such that its cost-benefit ratio is minimum. The economical feasibility of the microhydro plant is studied by comparing its life-time cost to its life-time benefit. The benefit is determined by the cost of the corresponding energy generated through a diesel-driven generator set. The microhydro plant was found to be economically feasible over a wide range of inflation and interest rates.

scholarly journals Hydraulic Power Plant Machine Dynamic Diagnosis

2006 ◽  
Vol 13 (4-5) ◽  
pp. 409-427 ◽  
Author(s):  
Hans Günther Poll ◽  
José Carlos Zanutto ◽  
Walter Ponge-Ferreira
Keyword(s):  
Power Plant ◽  
Calculated Data ◽  
Life Time ◽  
Operating Conditions ◽  
Fine Tuning ◽  
Maintenance Cost ◽  
Recent Measurement ◽  
Related Data ◽  
Rotary Machine ◽  
Physical Quantities

A method how to perform an entire structural and hydraulic diagnosis of prototype Francis power machines is presented and discussed in this report. Machine diagnosis of Francis units consists on a proper evaluation of acquired mechanical, thermal and hydraulic data obtained in different operating conditions of several rotary and non rotary machine components. Many different physical quantities of a Francis machine such as pressure, strains, vibration related data, water flow, air flow, position of regulating devices and displacements are measured in a synchronized way so that a relation of cause an effect can be developed for each operating condition and help one to understand all phenomena that are involved with such kind of machine. This amount of data needs to be adequately post processed in order to allow correct interpretation of the machine dynamics and finally these data must be compared with the expected calculated data not only to fine tuning the calculation methods but also to accomplish fully understanding of the influence of the water passages on such machines. The way how the power plant owner has to operate its Francis machines, many times also determined by a central dispatcher, has a high influence on the fatigue life time of the machine components. The diagnostic method presented in this report helps one to understand the importance of adequate operation to allow a low maintenance cost for the entire power plant. The method how to acquire these quantities is discussed in details together with the importance of correct sensor balancing, calibration and adequate correlation with the physical quantities. Typical results of the dynamic machine behavior, with adequate interpretation, obtained in recent measurement campaigns of some important hydraulic turbines were presented. The paper highlights the investigation focus of the hydraulic machine behavior and how to tailor the measurement strategy to accomplish all goals. Finally some typical recommendations based on the experience obtained on previous diagnostic reports of Francis turbines are performed in order to allow a better and safe operation of these power plant units.

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