2015 International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)最新文献_第5页

Modeling and implementation of impedance based fault locator for medium transmission line 基于阻抗的中传线故障定位器建模与实现

2015 International Conference on Condition Assessment Techniques in Electrical Systems (CATCON) Pub Date : 2015-12-01 DOI: 10.1109/CATCON.2015.7449518

Adil Abdul Hameed, Ankush Gupta, A. S. Kiranraj, G. A. Devendran, P. Raja

引用次数: 1

Characteristic signature identification of air-gap eccentricity faults using extended d-q model for three phase induction motor 基于扩展d-q模型的三相异步电动机气隙偏心故障特征特征识别

2015 International Conference on Condition Assessment Techniques in Electrical Systems (CATCON) Pub Date : 2015-12-01 DOI: 10.1109/CATCON.2015.7449526

S. Bindu, V. Thomas

{"title":"Characteristic signature identification of air-gap eccentricity faults using extended d-q model for three phase induction motor","authors":"S. Bindu, V. Thomas","doi":"10.1109/CATCON.2015.7449526","DOIUrl":"https://doi.org/10.1109/CATCON.2015.7449526","url":null,"abstract":"The supremacy of three phase squirrel cage induction motors in industrial drives demands accurate and reliable diagnostics for condition monitoring and internal fault detections. Operating stresses on these machines are electrical, mechanical, thermal, magnetic and environmental in nature and might result in internal faults. Avoiding unscheduled maintenance and repair intervention can prevent losses in money, material, manpower and time in process industries. Detection of faults in its early stage becomes an indispensable need especially in critical applications. Mathematical model based simulation studies will support fault signature identification to a great extent. Conventional d-q model of AC machines are not generally used for internal fault diagnoses. In this paper a novel attempt is made for simulating eccentricity related faults by modifying conventional d-q model of three phase induction motor. Characteristic fault signatures were identified in the stator current frequency spectrum for static, dynamic and mixed eccentricity conditions. The increase in magnitudes of these characteristic frequency components with increase in severity of faults is also established through model based simulation studies. The experimental study results presented for static eccentricity in a three phase squirrel cage induction motor clearly validates the modelling approach.","PeriodicalId":385907,"journal":{"name":"2015 International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126006629","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: 4

DCT combined with fractal quadtree decomposition and Huffman coding for image compression DCT结合分形四叉树分解和霍夫曼编码进行图像压缩

2015 International Conference on Condition Assessment Techniques in Electrical Systems (CATCON) Pub Date : 2015-12-01 DOI: 10.1109/CATCON.2015.7449503

S. Padmavati, Vaibhar Mesharam

{"title":"DCT combined with fractal quadtree decomposition and Huffman coding for image compression","authors":"S. Padmavati, Vaibhar Mesharam","doi":"10.1109/CATCON.2015.7449503","DOIUrl":"https://doi.org/10.1109/CATCON.2015.7449503","url":null,"abstract":"With advancement of technology, the image processing techniques play an important role. Image processing is required to improve the pictorial information for human perception and for autonomous machine applications. It finds application in various fields such as quality control, remote sensing, imaging science, etc. It also finds application in areas where efficient storage and transmission of images is necessary, Say for example; we want to store an image in the computer with less disk space. Also, in cases where we want to signal an image or video on a transmission medium with less bandwidth communication channel. Images are usually in the form of matrices and an uncompressed image uses huge number of bytes for storage. Image compression is used to reduce the size of the bitmap without compromising on the quality of an image. This enables to store large number of images in the same given amount of storage space. Image compression will also reduce the time taken to transmit or to download images from the internet. Many methods are available to compress an image file. The image compression methods which have gained popularity are the transform based coding methods like Discrete Cosine Transform (DCT), discrete wavelet Transform (DWT) and fractals. However these methods have drawbacks like low compression ratio and high encoding time. In this paper a new hybrid methodology is proposed by combining lossy and lossless compression methods. The proposed hybrid technique combines DCT and fractal quadtree decomposition with Huffman encoding of threshold value 0.2. The results obtained from the proposed method are then compared with state-of-the-art compression methods.","PeriodicalId":385907,"journal":{"name":"2015 International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114982989","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: 6

Cancer classification from gene expression based microarray data using SVM ensemble 基于支持向量机集成的基因表达微阵列数据的癌症分类

2015 International Conference on Condition Assessment Techniques in Electrical Systems (CATCON) Pub Date : 2015-12-01 DOI: 10.1109/CATCON.2015.7449500

Shemim Begum, Debasis Chakraborty, R. Sarkar

引用次数: 18

Extra high voltage DC extruded cable system qualification 特高压直流挤压电缆系统资质

2015 International Conference on Condition Assessment Techniques in Electrical Systems (CATCON) Pub Date : 2015-12-01 DOI: 10.1109/CATCON.2015.7449542

H. Ghorbani, A. Gustafsson, M. Saltzer, S. Alapati

引用次数: 3

Estimation of severity of simulated mechanical damages in a single isolated transformer winding 单隔离变压器绕组模拟机械损伤严重程度的估计

2015 International Conference on Condition Assessment Techniques in Electrical Systems (CATCON) Pub Date : 2015-12-01 DOI: 10.1109/CATCON.2015.7449541

P. Mukherjee, L. Satish

{"title":"Estimation of severity of simulated mechanical damages in a single isolated transformer winding","authors":"P. Mukherjee, L. Satish","doi":"10.1109/CATCON.2015.7449541","DOIUrl":"https://doi.org/10.1109/CATCON.2015.7449541","url":null,"abstract":"Transformer windings experience abnormal mechanical forces due to short-circuits occurring in its immediate network neighbourhood. The cumulative strain from these abnormal forces lead to winding damages. Occurrence of damages can be detected with high sensitivity using the well-known frequency response method. The damages most often manifest as a right or left shift of the peak/trough in the frequency response. It is beneficial to the operator looking at these shifts to know extent of severity of a damage, to enable taking a decision whether to continue operation of the transformer or not. Presently, there exists no such assistance. With this motivation, this paper proposes a new index that can effectively capture the severity of damage of any kind and be applicable to all kinds of windings. In this preliminary work, simulation results on a fully coupled ladder network along with practical measurements on a model-coil are presented to demonstrate efficacy of the proposed index to qualitatively capture the severity of a damage. In this preliminary work, damage is simulated as a discrete change in an element of the ladder network or model-coil.","PeriodicalId":385907,"journal":{"name":"2015 International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127865265","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

Symmetrical components based advanced scheme for detection of incipient inter-turn fault in transformer 基于对称分量的变压器初期匝间故障检测方法

2015 International Conference on Condition Assessment Techniques in Electrical Systems (CATCON) Pub Date : 2015-12-01 DOI: 10.1109/CATCON.2015.7449521

P. A. Venikar, M. Ballal, B. Umre, H. Suryawanshi

引用次数: 3

Effect of cold fog on leakage current characteristics of polluted insulators 冷雾对污染绝缘子泄漏电流特性的影响

2015 International Conference on Condition Assessment Techniques in Electrical Systems (CATCON) Pub Date : 2015-12-01 DOI: 10.1109/CATCON.2015.7449527

M. M. Hussain, S. Farokhi, S. McMeekin, M. Farzaneh

{"title":"Effect of cold fog on leakage current characteristics of polluted insulators","authors":"M. M. Hussain, S. Farokhi, S. McMeekin, M. Farzaneh","doi":"10.1109/CATCON.2015.7449527","DOIUrl":"https://doi.org/10.1109/CATCON.2015.7449527","url":null,"abstract":"Due to the wide range applications of high voltage insulators in power network systems, the reliable performance of insulators is challenged by different climate conditions including soluble and non-soluble contaminations. High voltage insulators installed near coastal areas are heavily contaminated with sea salt. In winter, due to the combined effect of sea salt and cold fog deposition, leakage current (LC) may flow on the insulators and surface degradation may take place, which may lead to surface flashover and consequently, to premature failure of power network systems. The leakage current waveform has a strong relationship with the contamination level, fog conditions and applied voltage. The investigation of LC before the flashover is essential to the reliability and secure operation of outdoor insulators. To determine the leakage current (LC) performance of high voltage silicone rubber insulators, laboratory investigation was carried out in an environmental chamber to understand this phenomenon and to simulate different behavior on the insulator surface. The performance of LC was investigated in laboratory during three different periods i.e. wetting period, drying period and dry band arcing period. Also for better understanding of insulator leakage current response an electrical model was used for computer based simulation using EMTP software. The relationship was analyzed on experimental and simulation work on the bases of magnitude and total harmonic distortion (THD).","PeriodicalId":385907,"journal":{"name":"2015 International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"37 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132767627","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: 12