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Estimation of Current TransformerInsulation Life with an Effect ofEnvironmental Variables 考虑环境变量影响的电流互感器绝缘寿命估算
Priti N. Bawankule, A. Thosar, P. S. Swami
Current transformer is an important component of EHV substation & the power system. Most of the faults occurring in current transformers are due to insulation failure. Insulation aging is a function of temperature and other environmental factors such as solar radiation and wind velocity. The aging effect is produced by Hot Spot Temperature (HST). The HST value depends on the ambient temperature, the rise in the Top Oil Temperature (TOT) over the ambient temperature, and the rise in the winding HST over the Top Oil Temperature. The winding hot-spot temperature can be calculated as a function of the Top Oil Temperature and that can be estimated using the transformer loading data, top-oil temperature, ambient temperature, wind velocity and solar radiation. This paper discusses the HST with considering environmental factor and without considering the environmental. The loss of life of insulation is related exponentially to the HST. This paper presents the mathematical model of Hot Spot Temperature under variable environmental condition in MATLAB.
电流互感器是超高压变电站和电力系统的重要组成部分。电流互感器的故障大多是由于绝缘失效引起的。绝缘层老化是温度和其他环境因素(如太阳辐射和风速)的函数。老化效应是由热点温度(HST)产生的。HST值取决于环境温度,顶部油温(TOT)高于环境温度的上升,以及绕组HST高于顶部油温的上升。绕组热点温度可以作为顶部油温的函数来计算,并且可以通过变压器负载数据、顶部油温、环境温度、风速和太阳辐射来估算。本文讨论了考虑环境因素和不考虑环境因素的HST。绝缘的寿命损失与高温超导成指数关系。本文在MATLAB中给出了变环境条件下热点温度的数学模型。
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引用次数: 0
Micro Strip Patch AntennaCharacteristics Using Different DielectricSubstrates 不同介质基板的微带贴片天线特性
Tilak Mukherjee, P. Rao, M. Bhavani, A. Sinha
In the recent times with the advent and progress of technology, dimension of things has been smaller and much smaller. We have different applications in microwave frequency range such as GSM, Bluetooth, and WLAN etc.in order to use this applications we need different antenna lengths, but as technology is being advanced the demand of making an antenna which operates in all the above applications is required. To fulfill the demand of above stated antenna, a design of micro strip patch antenna which works under multi frequency of operation using serrated structures has been introduced. This antenna maintains a maximum gain of 7-8dB. The designed antenna has a small overall size of 13×13×0.67 cm, and operates over the frequency ranges, 1.45 GHz,-1.85 GHz, 2.10–2.70 GHz, and 2.82–3.74 GHz making it suitable for GSM 1.8GHz, Bluetooth 2.4GHZ, WLAN 2.4 GHz and Wi-MAX 3.5 GHz applications. Experimental results show that remarkable antenna gains over the operating bands with efficient radiation patterns are obtained.
近年来,随着科技的出现和进步,事物的尺寸越来越小。我们在微波频率范围内有不同的应用,如GSM,蓝牙和WLAN等,为了使用这些应用,我们需要不同的天线长度,但随着技术的进步,需要制造在所有上述应用中运行的天线。为了满足上述天线的需求,本文介绍了一种多频率工作的锯齿结构微带贴片天线的设计。这种天线保持7-8dB的最大增益。设计的天线整体尺寸较小,为13×13×0.67 cm,工作频率范围为1.45 GHz、-1.85 GHz、2.10-2.70 GHz和2.82-3.74 GHz,适用于GSM 1.8GHz、蓝牙2.4 GHz、WLAN 2.4 GHz和Wi-MAX 3.5 GHz应用。实验结果表明,在有效辐射方向图的工作频带上,天线增益显著。
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引用次数: 2
Determination of Excitation Capacitance of aThree Phase Self Excited Induction Generator 三相自励感应发电机励磁电容的测定
Anamika Kumari, A. Thosar, S. S. Mopari
The depletion of fossil fuels in the world, has given rise to the importance of non-conventional energy sources. Wind turbines and micro hydro generators with induction generators are considered as an alternative choice. Wind turbines with Self-excited Induction Generators (SEIGs) are increasingly being used to generate clean renewable energy. SEIGs are widely being used in isolated areas (rural areas) to generate electrical energy. Capacitor banks are used with a purpose to provide reactive power for its excitation. The nonlinearity of the magnetizing inductance and the varying rotor speeds necessitates the calculation of excitation capacitance required for voltage build up in a SEIG. This paper presents the various approaches for determining the excitation capacitance and evaluates the value of excitation capacitor for 220/380V, 12.4/7.2A, 4 pole, 50Hz induction machine through various approaches, to build-up voltage for isolated operation of a self-excited induction generator.
世界上化石燃料的枯竭,引起了非传统能源的重要性。风力发电机和带感应发电机的微型水轮发电机被认为是另一种选择。带有自激感应发电机(SEIGs)的风力涡轮机越来越多地用于生产清洁的可再生能源。SEIGs在偏远地区(农村地区)广泛用于发电。电容器组的作用是为励磁提供无功功率。由于磁化电感的非线性和转子转速的变化,需要计算SEIG中建立电压所需的激励电容。本文介绍了确定220/380V、12.4/7.2A、4极、50Hz感应电机励磁电容的各种方法,并通过各种方法对自励感应发电机隔离运行时建立电压的励磁电容值进行了评定。
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引用次数: 1
Design of Sliding Mode Control for BUCKConverter buck变换器的滑模控制设计
Kruti. R.Joshi, Hardik V.Kannad
The main objective of this paper is to design a SM Controller for a buck converter to convert a dc input voltage to the required lower dc output voltage level for lower power application to solve the problem of voltage regulation and high power loss of the linear voltage regulator circuit. The converter uses a switching scheme which operates the switch MOSFET in cutoff and saturation region to reduce power loss across MOSFET. Then, the output voltage is controlled using SM Control technique to get the desired output voltage level. The design is based on low power application such as laptop charger, mobile charger etc. The circuit is simulated using MATLAB/SIMULINK software to obtain desired response.The SM control is a type of nonlinear control introduced initially as a means for controlling variable structure systems. The main advantage of the SM control over other types of nonlinear control methods is its ease of implementation. This makes it well suited for common DC–DC power regulation purposes. The SM control is naturally well suited for the control of variable structure systems. Characterized by switching, power converters are inherently variable structure systems. It is therefore; appropriate to apply SM control on power converters.
本文的主要目的是为降压变换器设计一个SM控制器,将直流输入电压转换为低功率应用所需的较低直流输出电压电平,以解决线性稳压电路的稳压和高功率损耗问题。转换器采用开关方案,在截止和饱和区域操作开关MOSFET,以减少MOSFET的功率损耗。然后,利用SM控制技术对输出电压进行控制,得到所需的输出电压水平。本设计基于低功耗应用,如笔记本充电器、手机充电器等。利用MATLAB/SIMULINK软件对电路进行仿真,得到了期望的响应。SM控制是一种非线性控制,最初是作为控制变结构系统的一种手段引入的。相对于其他类型的非线性控制方法,SM控制的主要优点是易于实现。这使得它非常适合于常见的DC-DC功率调节目的。SM控制自然适合于变结构系统的控制。电源变换器具有开关特性,本质上是可变结构系统。因此;适用于电源变换器的SM控制。
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引用次数: 0
PV Array Fed SEPIC and MCSPWM BasedRV Inverter Topology for Single PhaseInduction Motor 基于PV阵列的SEPIC和MCSPWM单相感应电机逆变器拓扑
Anupama Gupta, Shimi S.L.
This paper presents a simulation Modelling of SEPIC converter and MCSPWM based RV topology for single phase induction motor using solar energy as a source. The large numbers of drives used for commercial, industrial, residential and utility application are induction motor drive. To run such kind of load energy is required as an input source but due to energy crises solar energy is used as an input energy. To run induction motor with PV source DC-DC converter and inverter is used as an interface circuit. For efficient utilization of solar power SEPIC converter with the P &O MPPT controller is used. The boosted output from SEPIC converter use as an input for inverter. The inverter converts the DC input voltage to AC output voltage for the induction motor. To minimize the harmonic from the inverter output voltage, various types of MCSPWM techniques use to generate the firing pulse for the switches of the inverter. In this paper comparative analysis of Cascaded H bridge inverters and RV topology is also presented for the induction motor. The simulation work of these SEPIC converter and RV inverter fed induction motor circuits have been done using SIMULINK and MATLAB software.
本文提出了一种基于SEPIC变换器和MCSPWM的太阳能单相感应电动机RV拓扑的仿真建模方法。用于商业,工业,住宅和公用事业应用的大量驱动器是感应电动机驱动。运行这种负荷需要能量作为输入源,但由于能源危机,太阳能被用作输入能源。采用直流-直流变换器和逆变器作为接口电路实现感应电机与光伏电源的运行。为了高效利用太阳能,采用了SEPIC变换器和p&o MPPT控制器。SEPIC变换器的升压输出用作逆变器的输入。逆变器将直流输入电压转换为感应电机的交流输出电压。为了最小化逆变器输出电压的谐波,使用各种类型的MCSPWM技术来为逆变器的开关产生发射脉冲。本文还对感应电动机的级联H桥逆变器和RV拓扑结构进行了比较分析。利用SIMULINK和MATLAB软件对SEPIC变换器和RV逆变器馈感应电机电路进行了仿真研究。
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引用次数: 0
A Review on Data Security Using VideoSteganography 视频骨摄影数据安全研究进展
J. Joshi, Mithilesh Choudhary, Vikas Tiwari, Suraj Bhagasara
Information security has become the area of concern as a result of wide spread use of communication medium over the internet. This project focuses on the data security approach when combined with encryption and steganographic techniques for secret communication by hiding it inside the multimedia files. The high results are achieved by providing the security to data before transmitting it over the internet. The files such as images, audio, video contains collection of bits that can be further translated into images, audio and video. The files composed of insignificant bits or unused areas which can be used for overwriting of other data. This project explains an AES algorithm using video steganography for enhancing data security.
随着互联网通讯媒介的广泛使用,信息安全已成为人们关注的领域。这个项目的重点是数据安全方法,当与加密和隐写技术相结合时,通过隐藏在多媒体文件中进行秘密通信。高的结果是通过在互联网上传输数据之前提供安全性来实现的。图像、音频、视频等文件包含可以进一步转换成图像、音频和视频的比特的集合。由无关紧要的位或未使用的区域组成的文件,可用于覆盖其他数据。本项目解释了一种使用视频隐写技术来提高数据安全性的AES算法。
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引用次数: 1
Study of Transient Behaviour of the CapacitorVoltage Transformer 电容电压互感器的暂态特性研究
Amit Kumar, A. G. Thosar, Vivek Moroney
Capacitive Voltage Transformers (CVTs) are widely used as source of voltage signals for monitoring, protection relays and control application at transmission and sub transmission voltage level. The main component of the CVT are the capacitive voltage divider, a tuning reactor, a step down voltage transformer, a Ferro-resonance suppression circuit and the burden made by the relay. CVT are used for protection of high voltage lines, substations and transmission of high frequency signals. These applications required low voltage signal, which is given by output of CVT. The CVT applications require fast and secure protection. The energy storage elements like inductors & capacitors cause CVTs to exhibit transient behaviour. Further the performance of protection devices is also affected by the transient of CVTs. In steady state, the secondary voltage of a capacitor voltage transformer mirrors the primary voltage. Because of the energy-storage elements used, the transient output, caused by sudden change in primary voltage, is no longer a replica of the primary. Transient over voltages, which exceed insulation ratings can stress electrical insulation, leading to abrupt failure or gradual breakdown of the dielectric of electrical component. This paper attempts to study the effects of changes in capacitor values on the transient response of the CVT. Furthermore, the various method which affects the transient response are discussed by simulating the mathematical model using MATLAB
电容式电压互感器(cvt)作为电压信号源广泛应用于输变电和次输变电电压级的监测、保护和控制。无级变速器的主要组成部分是电容分压器、调谐电抗器、降压互感器、铁谐振抑制电路和继电器负载。无级变速器主要用于高压线路、变电站的保护和高频信号的传输。这些应用需要低电压信号,该信号由无级变速器输出。无级变速器的应用需要快速和安全的保护。像电感和电容器这样的储能元件使cvt表现出瞬态行为。此外,cvt的暂态也会影响保护装置的性能。在稳定状态下,电容器电压互感器的二次电压反映了一次电压。由于使用了储能元件,由一次电压突然变化引起的瞬态输出不再是一次电压的复制品。超过绝缘额定值的瞬态过电压会对电气绝缘造成压力,导致电气元件的介电介质突然失效或逐渐击穿。本文试图研究电容值的变化对无级变速器暂态响应的影响。在此基础上,利用MATLAB对数学模型进行仿真,讨论了影响系统暂态响应的各种方法
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引用次数: 0
Freeware Power Generation StructuralImplementation Strategy using Solar Panels inParallel Approach 利用太阳能板并行方法的免费发电结构实现策略
S. N. Fathima, Syed Thouheed Ahmed
As the energy demand is drastically increasing day by day all over the world. The reserves of fossil fuels like coal, oil and natural gas are depleting. To cope up with this unbalancing situation, we should keep more optimistic view about the renewable energy source. In India there is an abundant source of solar energy, this can be utilized in fulfilling the lower demands of the community. In this paper, solar energy is converted into electrical energy by photo voltaic effect hence a voltage is created appended to the load with an economical hardware and cost.
随着世界各地能源需求的急剧增长。煤炭、石油和天然气等化石燃料的储量正在枯竭。为了应对这种不平衡的局面,我们应该对可再生能源保持更乐观的看法。印度有丰富的太阳能资源,可以用来满足社区较低的需求。本文利用光伏效应将太阳能转化为电能,从而产生附加在负载上的电压,具有经济的硬件和成本。
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引用次数: 0
Trusted Execution Environment - To HardenEvery Day Android Applications on IntelArchitecture 可信的执行环境-加强每天在IntelArchitecture上的Android应用程序
Sumanth Naropanth, M.Dakshayini
More and more people are using their smartphones and tablets to surf the web, update social networking sites and also to shop & bank online. Consequently cybercriminals and malware are increasingly targeting mobile devices. Internet users are connecting to cloud based services today more than they have done so in the past. The explosion of mobile platforms, primarily smartphones and tablets has made access to services such as email, social networking, media streaming, online banking and online shopping easily available to the less tech-savvy common man. Security vulnerabilities affecting Android devices can compromise sensitive user data and lead to data loses not just minor inconveniences. We are demonstrating the use of Trusted Execution Environment in Mobile devices makes applications more secure and resistant to many attacks.
越来越多的人使用智能手机和平板电脑上网、更新社交网站、网上购物和网上银行。因此,网络罪犯和恶意软件越来越多地瞄准移动设备。今天的互联网用户比过去更多地连接到基于云的服务。移动平台(主要是智能手机和平板电脑)的爆炸式增长,使得不太懂技术的普通人也能轻松获得电子邮件、社交网络、流媒体、网上银行和网上购物等服务。影响Android设备的安全漏洞可能危及敏感用户数据并导致数据丢失,而不仅仅是轻微的不便。我们正在演示在移动设备中使用可信执行环境可以使应用程序更加安全,并抵抗许多攻击。
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引用次数: 0
Development of GSM and GPS based CostEffective Telematics Module 基于GSM和GPS的高效远程信息处理模块的开发
P.Raji, S.Ashok
The ability of a vehicle tracking system to track vehicles is useful in many applications including security of personal vehicles, public transportation systems, fleet management and others. Furthermore, there is a rapid increase on number of vehicles on the road globally. Therefore, the development of Telematics module using the Global Positioning System (GPS) and Global System for Mobile Communications (GSM) modem is undertaken with the aim of enabling users to locate their vehicles with ease and in a convenient manner. The system will provide the users with the ability to track vehicle remotely through the mobile network. This paper describes the development of the Telematics module hardware prototype. Especially, the system will utilize GPS to obtain a vehicle's coordinate and transmit it using GSM modem to the user's mobile number through the mobile network. The proposed system will also be able identify the accident by means of the range of vibration. The main hardware components of the system areL80- M39 GPS receiver module, SIM900A GSM module, LDT0-028K vibration sensor, RF Transmitter and Receiver and Arduino Mega 2560 microcontroller. The developed telematics module demonstrates the feasibility of near real-time tracking of vehicles and improved customizability, global operability and cost when compared to existing solutions.
车辆跟踪系统跟踪车辆的能力在许多应用中都很有用,包括个人车辆的安全、公共交通系统、车队管理等。此外,全球道路上的车辆数量正在迅速增加。因此,利用全球定位系统(GPS)和全球移动通信系统(GSM)调制解调器开发Telematics模块,目的是使用户能够轻松方便地定位他们的车辆。该系统将为用户提供通过移动网络远程跟踪车辆的能力。本文介绍了远程信息处理模块硬件样机的开发。特别是,该系统将利用GPS获取车辆的坐标,并利用GSM调制解调器通过移动网络将其传输到用户的移动号码。所提出的系统还可以通过振动范围来识别事故。系统硬件主要由areL80- M39 GPS接收模块、SIM900A GSM模块、LDT0-028K振动传感器、射频收发器和Arduino Mega 2560单片机组成。与现有解决方案相比,开发的远程信息处理模块证明了车辆近实时跟踪的可行性,并提高了可定制性、全球可操作性和成本。
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引用次数: 4
期刊
International Journal of Advanced Research in Electrical, Electronics and Instrumentation Energy
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