Simulation and Modelling of Electrical Insulation Weaknesses in Electrical Equipment最新文献

Simulation and Optimization of Electrical Insulation in Power Quality Monitoring Sensors Applied in the Medium-Voltage 中压电能质量监测传感器电绝缘仿真与优化

Simulation and Modelling of Electrical Insulation Weaknesses in Electrical Equipment Pub Date : 2018-10-17 DOI: 10.5772/INTECHOPEN.77187

Sender Rocha dos Santos, Rodrigo Peres, W. Cano, J. Rosolem

{"title":"Simulation and Optimization of Electrical Insulation in Power Quality Monitoring Sensors Applied in the Medium-Voltage","authors":"Sender Rocha dos Santos, Rodrigo Peres, W. Cano, J. Rosolem","doi":"10.5772/INTECHOPEN.77187","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.77187","url":null,"abstract":"Thanks to the Smart Grid initiative, the focus for medium-voltage MV (13.8 – 34 kV) smart meters leveraged the development of sensors for distribution application. In order to be useful at power quality monitoring, the sensors needs to attend, at least, the International Electrotechnical Commission (IEC) 61000 – 4-30 and IEC 61000 – 4-7 standards with high-accuracy in terms of voltage (less than 0.1%), current (less than 1.0%) and measuring the waveform distortion data up to the 50th harmonic of 50 or 60 Hz alternating frequency. This kind of sensor is built with two capacitors connected in series. The first capacitor is a commercial electronic low-voltage device. One terminal of this capacitor is connected to the medium-voltage (MV) conductor. The second one, is connected to the other capacitor that is constructed using the own sensor packaging. This second capacitor has an electrode, that is connected with the first capacitor and the other terminal is connected to the ground. The voltage is measured between the terminals of the low voltage capacitor. The performance of this capacitor depends on the geometry and the materials used in the electrical insulation. This chapter describes the simulations and modeling of the capacitor electrodes using a finite-elements software, COMSOL Multiphysics, for modeling in order to optimize the performance of sensor in terms of electric field distribution.","PeriodicalId":158262,"journal":{"name":"Simulation and Modelling of Electrical Insulation Weaknesses in Electrical Equipment","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124451462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessment of Dielectric Paper Degradation through Mechanical Characterisation 通过力学表征评估介电纸的降解

Simulation and Modelling of Electrical Insulation Weaknesses in Electrical Equipment Pub Date : 2018-10-17 DOI: 10.5772/INTECHOPEN.77972

C. Fernández-Diego, I. Fernández, F. Ortiz, IsidroCarrascal, C. Renedo, F. Delgado

引用次数: 1

Typical Internal Defects of Gas-Insulated Switchgear and Partial Discharge Characteristics 气体绝缘开关设备的典型内部缺陷及局部放电特性

Simulation and Modelling of Electrical Insulation Weaknesses in Electrical Equipment Pub Date : 2018-10-17 DOI: 10.5772/INTECHOPEN.79090

F. Zeng, Ju Tang, Xiaoxing Zhang, Siyuan Zhou, C. Pan

引用次数: 12

Development Prospect of Gas Insulation Based on Environmental Protection 基于环保的气体绝热发展展望

Simulation and Modelling of Electrical Insulation Weaknesses in Electrical Equipment Pub Date : 2018-10-17 DOI: 10.5772/INTECHOPEN.77035

D. Xiao

引用次数: 24

Electrical Insulation Weaknesses in Wide Bandgap Devices 宽频带隙器件的电绝缘缺陷

Simulation and Modelling of Electrical Insulation Weaknesses in Electrical Equipment Pub Date : 2018-10-17 DOI: 10.5772/INTECHOPEN.77657

M. Ghassemi

{"title":"Electrical Insulation Weaknesses in Wide Bandgap Devices","authors":"M. Ghassemi","doi":"10.5772/INTECHOPEN.77657","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.77657","url":null,"abstract":"The power electronics research community is balancing on the edge of a game-changing technological innovation: as traditionally silicon (Si) based power semiconductors approach their material limitations, next-generation wide bandgap (WBG) power semiconductors are poised to overtake them. Promising WBG materials are silicon carbide (SiC), gallium nitride (GaN), diamond (C), gallium oxide (Ga2O3) and aluminum nitride (AlN). They can operate at higher voltages, temperatures, and switching frequencies with greater efficiencies compared to existing Si, in power electronics. These characteristics can reduce energy consumption, which is critical for national economic, health, and security interests. However, increased voltage blocking capability and trend toward more compact packaging technology for high-power density WBG devices can enhance the local electric field that may become large enough to raise partial discharges (PDs) within the module. High activity of PDs damages the insulating silicone gel, lead to electrical insulation failure and reduce the reliability of the module. Among WBG devices, electrical insulation weaknesses in WBG-based Insulated Gate Bipolar Transistor (IGBT) have been more investigated. The chapter deals with (a) current standards for evaluation of the insulation systems of power electronics modules, (b) simulation and modeling of the electric field stress inside modules, (c) diagnostic tests on modules, and (d) PD control methods in modules.","PeriodicalId":158262,"journal":{"name":"Simulation and Modelling of Electrical Insulation Weaknesses in Electrical Equipment","volume":"300 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121460803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 30

Generator Insulation-Aging On-Line Monitoring Technique Based on Fiber Optic Detecting Technology 基于光纤检测技术的发电机绝缘老化在线监测技术

Simulation and Modelling of Electrical Insulation Weaknesses in Electrical Equipment Pub Date : 2018-10-17 DOI: 10.5772/INTECHOPEN.78065

P. Kung

{"title":"Generator Insulation-Aging On-Line Monitoring Technique Based on Fiber Optic Detecting Technology","authors":"P. Kung","doi":"10.5772/INTECHOPEN.78065","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.78065","url":null,"abstract":"The relationship between insulation aging and generator lifespan using fiber optic sen - sors (FOSs) is explored to ultimately improve asset lifespan through smart choices in run ning conditions and maintenance. Insulation aging is a major factor that causes generator failure. FOS provides the rare opportunity of being installed up close to the insulation, monitoring degradations that are otherwise difficult to detect. FOSs, unlike purely electri - cal transducers, are immune to high voltage (HV) and strong electromagnetic (EM) fields. They are small and have a proven long life by their deployment in the Telecom industry. The proposed FOS is a Fabry-Perot cavity made up of two identical fiber Bragg gratings (FBGs) using light wave interference as the working principle. Such architecture delivers simultaneous vibration (10 Hz–1 kHz) and temperature (0.1°C resolution) monitoring, both helping to spot irregular vibration patterns (signatures) and hot-spots inside the generator stator slots. The signal processing unit equipped with a gateway device can help to connect the large volume of sensor data, allowing correlation with the supervisory control and data acquisition (SCADA) system data of the plant. This chapter also elaborates on the field test jointly conducted with Calpine Corporation and Oz Optics, Ltd. (Ottawa, Ontario, Canada).","PeriodicalId":158262,"journal":{"name":"Simulation and Modelling of Electrical Insulation Weaknesses in Electrical Equipment","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114677981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Modeling and Simulation of Rotating Machine Windings Fed by High-Power Frequency Converters for Insulation Design 大功率变频器馈入旋转电机绕组的建模与仿真

Simulation and Modelling of Electrical Insulation Weaknesses in Electrical Equipment Pub Date : 2018-10-17 DOI: 10.5772/INTECHOPEN.78064

F. E. Cortes, P. Gómez, Mohammed KhalilHussain

{"title":"Modeling and Simulation of Rotating Machine Windings Fed by High-Power Frequency Converters for Insulation Design","authors":"F. E. Cortes, P. Gómez, Mohammed KhalilHussain","doi":"10.5772/INTECHOPEN.78064","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.78064","url":null,"abstract":"Modern power systems include a considerable amount of power electronic converters related to the introduction of renewable energy sources, high-voltage direct current (HVDC) systems, adjustable speed drives, and so on. These components introduce repet- itive pulses generated by the commutation of semiconductor switches, resulting in overvoltages with very steep fronts and high dielectric stresses. This phenomenon is one of the main causes of accelerated insulation aging of motors in power electronic-based systems. This chapter presents state-of-the-art computational tools for the analysis of motor wind- ings excited by fast-front pulses related to the use of frequency converters based on pulse-width modulation (PWM). These tools can be applied for the accurate prediction of over- voltages and dielectric stresses required to propose insulation design improvements. In the case of the stress-grading system used in medium-voltage (MV) motors, transient finite-element method (FEM) is used to study the effect of fast pulses. It is shown how, by controlling the material properties and the design of the stress-grading systems, solutions to reduce the adverse effects of fast pulses from PWM-type inverters can be proposed.","PeriodicalId":158262,"journal":{"name":"Simulation and Modelling of Electrical Insulation Weaknesses in Electrical Equipment","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129739019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1