VelTech HighTech Engineering College

Āvadi, India

VelTech HighTech Engineering College

Āvadi, India

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Sivakumar R.,Priyadarshini Engineering College | Raja C.,Archana Institute of Technology | Banu Priya P.,VelTech Hightech Engineering College
International Journal of Applied Engineering Research | Year: 2015

This concept represents an AC-to-AC conversion for voltage and current control scheme with instantaneous reactive power minimization also reduce the harmonics for high power applications in a distorted AC power supply. The strategy uses the commutation state of the converter in the subsequent sampling time according to an optimization algorithm given by a simple cost function and the discrete system model. Using this model, harmonics in the input current generated by the resonance of the input filter and output filter are strongly reduced. By using bidirectional converter will reduce the reactive power by connecting the capacitors at the both side of control unit. © Research India Publications.


Alamelu Mangai K.,VelTech HighTech Engineering College | Tamizh Selvi K.,VelTech HighTech Engineering College | Priya M.,Saveetha Engineering College | Rathnakumari M.,Velammal Engineering College | And 2 more authors.
Journal of Materials Science: Materials in Electronics | Year: 2016

The M-type strontium hexaferrite SrFe12O19 nano particles with nominal composition were prepared by self-propagating high temperature synthesis route. The ac conductivity and dielectric properties of SrFe12O19 samples were studied by using complex impedance technique. The dielectric properties like dielectric constant ((Formula presented.)), dielectric loss (tan δ) and ac conductivity (σac) were measured at different calcination temperatures in the frequency ranges from 50 Hz to 5 MHz. The frequency dependence of ac conductivity is analysed by the power law σ(ω)ac = Bωn which is typical for charge transport by tunnelling processes. The temperature dependence of frequency exponent n was investigated to understand the conduction mechanism at different calcination temperatures. The conduction mechanisms are mainly based on polaron hopping conduction. The results of the cole–cole diagram of (Formula presented.) and (Formula presented.) at different temperatures ensure the presence of grain and grain boundaries having different conductivities in the investigated nano particle samples. The dielectric and impedance properties of the prepared strontium hexaferrite samples were discussed in view of applications for microwave devices, permanent magnets and high frequency magnetic recording media. © 2016 Springer Science+Business Media New York


Mangai K.A.,VelTech HighTech Engineering College | Priya M.,Saveetha Engineering College | Rathnakumari M.,Velammal Engineering College | Sureshkumar P.,Velammal Engineering College
Journal of Applied Spectroscopy | Year: 2014

Strontium ferrite enjoys a high degree of chemical stability and is completely nontoxic, which makes it ideal for a wide range of applications. Magnetoplumbite-type (M-type) hexagonal strontium ferrite particles were synthesized via the sol-gel technique employing ethylene glycol as the gel precursor. The phase morphology, particle diameter, and magnetic properties of the prepared samples were studied using X-ray diffractometry (XRD), scanning electron microscope (SEM), and a vibrating sample magnetometer (VSM), respectively. The effect of temperature on the crystal structure, morphology, and magnetic studies were carried out. Also, the thermal decomposition of assynthesized powdered samples has been studied by thermogravimetric (TG) and differential thermal analysis (DTA) methods. The optical properties were analyzed using fluorescence spectra. The XRD results showed that the samples synthesized at 600°C, 800°C, and 1000°C were of single phase and smaller crystallite size. The intensity of the emission spectra of strontium ferrite was also examined. The yield percentage along with structure determination and VSM studies of the prepared samples are discussed in detail. © 2014 Springer Science+Business Media New York.


Shajan D.,Veltech Hightech Engineering College | Murugasen P.,Saveetha Engineering College | Sagadevan S.,AMET University
Digest Journal of Nanomaterials and Biostructures | Year: 2016

Borate glasses were synthesized by the conventional rapid melt quench method. The XRD pattern confirmed the amorphous nature of borate glass. Optical properties of borate glass were studied using the Photoluminescence spectrum. IR spectrum was analyzed to determine and differentiate the various vibrational modes in the structural changes. Raman spectroscopy of borate glass was also carried out. According to TGA/ DTA and DSC analysis, decomposition pattern had been formulated to account for the weight losses observed. The dielectric properties such as the dielectric constant, the dielectric loss, and AC conductivity of the borate glass were studied in the different frequencies and temperature. © 2016, Inst Materials Physics. All right reserved.


Rajesh R.,Vel Technology University | Mutharasan A.,VelTech HighTech Engineering College | Rameshkumar T.,VelTech HighTech Engineering College | Senthilkumaran B.,Vel Technology University
International Journal of Applied Engineering Research | Year: 2015

The electric power system is a complex system, whose operating condition may not remain at a constant value. This necessitates the power system operator be alert to keep the system performance under normal condition. The various contingencies like, large load variations, outage of components (transmission lines, transformers, generators, etc.) are more common. Any of these conditions causes overloads and system parameters to exceed the limits thus resulting in an insecure system. Hence the operator has to maintain the security level by proper analysis and reschedule the system accordingly. The most practiced techniques for Congestion Management is generator rescheduling and/or load shedding. The conventional method is to solve an optimal power flow problem to find out the generation rescheduling. But this will not give the desired speed of solution. This paper considers the application of Genetic Algorithm to dispatch the generator to relieve the outages in power system. A Genetic Algorithm rule based controller is developed which reschedules the real power generation under emergency conditions OPF is preferred. This paper mainly focuses on congestion management under emergency conditions. The proposed approach is illustrated with 26 Bus System. The validity of the proposed method is done using MATPOWER. © Research India Publications.


Mutharasan A.,VelTech HighTech Engineering College | Niranjan Kumar R.,Sri Krishna College of Engineering And Technology | Rameshkumar T.,VelTech HighTech Engineering College | Ajitha A.,Veltech Rangarajan Drsakunthala R And D Institute Of Science And Technology
International Journal of Applied Engineering Research | Year: 2014

In this paper we discuss about the power quality analysis for matrix converter. The proposed system consists of a Shunt Active Filter which improves the power quality by eliminating the Total Harmonics Distortion. Normally the Matrix Converter itself injects significant harmonics to the existing system. In proposed system the approach will completely remove the Total Harmonics Distortion & reduce the effect, which increase the Power Quality. The methodology has been tested and verified using the Mat lab/ Simulink. © Research India Publications.


Merry Ida A.,VelTech HighTech Engineering College | Ancy Breen W.,VelTech HighTech Engineering College | Queen Mary Vidya M.,VelTech HighTech Engineering College
International Journal of Applied Engineering Research | Year: 2014

As the world is more relying on the ATM s nowadays the ,card mechanism which hold as the key for access has been facing many problems like duplication ,theft and misuse. Many methods have been suggested for overcoming these problems using Biometric techniques like Eyes - Retina Recognition, Eyes - Iris Recognition, Fingerprint Recognition, Hand Geometry Recognition, and Signature Recognition. Biometrics are automated methods of recognizing a person based on a physiological or behavioural characteristic. A biometric system is a pattern recognition system that recognizes a person on the basis of a feature vector derived from a specific physiological or behavioural characteristic that the person possesses. In this paper we are combining both physiological and behavioural biometric. In this system will retain the use of the ATM card combined with facial recognition and will require the user to type the password according to the specification of the keystroke dynamics, for enhancing the security. Facial recognition has the main advantage that there can be no duplication because the facial features of each individual will be unique and the typing patterns of individuals are also different from each other. © Research India Publications.


Ajitha A.,Vel Technology University | Mutharasan A.,VelTech HighTech Engineering College | Dhal P.K.,Vel Technology University
International Journal of Applied Engineering Research | Year: 2015

Electric power generation in the mere future rely on renewable energy sources such as wind, solar, wave etc. Wind is the major resource and most available. In wind power Industry, the power quality issues such as fault ride through- Sag and Swell are still a concern. This paper gives a highly efficient single stage energy conversion device called Matrix Converter which provides a constant frequency at the output is employed along with Unified Power Flow controller to improve Power quality. The UPFC is the most versatile and complex power electronic equipment that has emerged for the control and optimization of power flow in electrical power transmission system. Its main function is to control the voltage, phase angle and impedance of the power system thereby modulating the line reactance and controlling the power flow in the transmission line, thereby helps to improve the power quality. © Research India Publications.


Alamelu Mangai K.,VelTech HighTech Engineering College | Tamizh Selvi K.,VelTech HighTech Engineering College | Priya M.,Saveetha Engineering College | Rathnakumari M.,Velammal Engineering College | And 2 more authors.
Journal of Materials Science: Materials in Electronics | Year: 2016

Cobalt substituted strontium ferrites SrCoxFe12−xO19 (x = 0.1, 0.2 and 0.3) were synthesized via sol–gel method and the dried gel obtained was annealed at 800 °C. The powder X-ray diffraction studies helped in the determination of the crystallite size that measured ≈ 12–14 nm. The optical properties of the powdered nanoparticles were determined by means of the UV–Vis absorption spectra of their dispersed solutions in liquid media. Despite these measurements, it was difficult to determine their band gap (Eg) precisely. However, the Kubelka–Munk treatment on the diffuse reflectance spectra of the powdered nanoparticles was used in order to extract their Eg unambiguously. The Co substituted strontium hexaferrites are used for optical studies. The energy band gap for all the ferrite compositions was found to be ≈ 1.46–1.78 eV. The study made on the dielectric behaviour of the substituted SrFe12O19 is also discussed in this paper. © 2016 Springer Science+Business Media New York

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