2017 3rd International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)最新文献_第7页

Analysis of electric stress and partial discharge ultra high frequency signal 电应力与局部放电超高频信号分析

2017 3rd International Conference on Condition Assessment Techniques in Electrical Systems (CATCON) Pub Date : 2017-11-01 DOI: 10.1109/CATCON.2017.8280212

B. Karthik, C. Kavya, P. Kundu

引用次数: 0

Cole-cole representation of transformer oil-paper insulation dielectric response 变压器油纸绝缘介质响应的Cole-cole表示法

2017 3rd International Conference on Condition Assessment Techniques in Electrical Systems (CATCON) Pub Date : 2017-11-01 DOI: 10.1109/CATCON.2017.8280180

S. K. Ojha, P. Purkait, S. Chakravorti

{"title":"Cole-cole representation of transformer oil-paper insulation dielectric response","authors":"S. K. Ojha, P. Purkait, S. Chakravorti","doi":"10.1109/CATCON.2017.8280180","DOIUrl":"https://doi.org/10.1109/CATCON.2017.8280180","url":null,"abstract":"Information about the condition of oil-paper insulation is of extreme importance for evaluating ageing status and maintenance requirement of transformers. Dielectric testing techniques in both time domain and frequency domain are being assessed in recent years as supplements to traditional techniques by researchers and utilities. Several attempts have thus been made to understand the physical processes of dielectric relaxation taking place during such tests by correlating conventional tests, time domain and frequency domain dielectric measurements, and chemical techniques. In practical dielectric systems, the dipoles are found to relax according to a distribution of elementary Debye relaxation frequencies during the dielectric response measurements. Researchers have proposed models that can simulate such many-body interaction processes with the help of suitable distribution density functions. Frequency domain spectroscopy (FDS) data can further be computed from the distribution density function thus formulated. The present contribution discusses mathematical formulations used for transforming time domain data to distribution domain and further to frequency domain. Findings about the influence on operating temperature, moisture content, charging voltage etc. on the relaxation process of oil-paper insulation have been reported in this contribution. Results of tests on field transformers are also presented. This paper also highlights the possible use of Cole-Cole models and employs the features of Cole-Cole diagrams for analyzing condition of dielectric materials.","PeriodicalId":250717,"journal":{"name":"2017 3rd International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128934248","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: 3

Life assessment of TUK and Nomex-910 impregnated mineral transformer oils using Raman spectroscopy 用拉曼光谱评价TUK和Nomex-910浸渍矿物变压器油的寿命

2017 3rd International Conference on Condition Assessment Techniques in Electrical Systems (CATCON) Pub Date : 2017-11-01 DOI: 10.1109/CATCON.2017.8280218

C. Ranga, A. Chandel

{"title":"Life assessment of TUK and Nomex-910 impregnated mineral transformer oils using Raman spectroscopy","authors":"C. Ranga, A. Chandel","doi":"10.1109/CATCON.2017.8280218","DOIUrl":"https://doi.org/10.1109/CATCON.2017.8280218","url":null,"abstract":"Concentration of furfural (Furan-2-carbaldehyde) in transformer oils is a well-known indicator for thermal degradation in oil-paper insulation. The application of Raman spectroscopy to determine thermal deterioration as a function of Furfural concentration can overcome many disadvantages of traditional detection methods and accelerated testing. In the present paper, thermal stability of thermally upgraded Kraft (TUK) and Nomex-910 impregnated mineral transformer oils has been investigated at higher accelerated thermal stresses. Samples having a standard mass ratio of oil and paper insulations in accordance with IEEE Std. C57.154-2012 have been studied. These samples were thermally stressed at 120°C and 150°C. Subsequently, the aged samples were analyzed using Raman spectroscopy test. Furfural was characterized by Raman signal at 1705.69 cm−1, where no spectral interferences caused by oil-derived Raman signals occur. It has been observed from the test results that the oil sample consisting of TUK has higher life than that of the Nomex-910 immersed oil sample. It indicates that the Furfural formation in TUK test samples is more as compared to its Nomex-910 counterpart. Hence the degradation rate of TUK oil samples is more at higher temperatures. Consequently, Nomex-910 has been found more suitable for high temperature applications than TUK.","PeriodicalId":250717,"journal":{"name":"2017 3rd International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132902539","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: 3

A review on impact of distributed generation and electrical vehicles on aging of distribution transformer 分布式发电和电动汽车对配电变压器老化的影响综述

2017 3rd International Conference on Condition Assessment Techniques in Electrical Systems (CATCON) Pub Date : 2017-11-01 DOI: 10.1109/CATCON.2017.8280229

Kanhaiya Kumar, G. Kumbhar

引用次数: 2

Preliminary investigations on propagation of partial discharge induced currents in a transformer winding 局部放电感应电流在变压器绕组中传播的初步研究

2017 3rd International Conference on Condition Assessment Techniques in Electrical Systems (CATCON) Pub Date : 2017-11-01 DOI: 10.1109/CATCON.2017.8280231

Santosh Janaki Raman, U. Kumar

{"title":"Preliminary investigations on propagation of partial discharge induced currents in a transformer winding","authors":"Santosh Janaki Raman, U. Kumar","doi":"10.1109/CATCON.2017.8280231","DOIUrl":"https://doi.org/10.1109/CATCON.2017.8280231","url":null,"abstract":"Historically, different variants of the distributed circuit model have been used to model the windings for the frequencies encountered in a PD excitation. However, all circuit based methodologies assume a transverse electro-magnetic (TEM) mode of propagation, and for a high frequency excitation as encountered in a PD, other modes could be excited. Therefore, deviating from the conventional circuit based methodologies, this paper employs a full-wave electromagnetic scheme for modelling of coils. Instabilities in the marching-on in time (MOT) methodologies encountered in a previous work are dealt by adopting a superior marching-on in degree (MOD) scheme. A layer winding is modelled and current distribution is obtained numerically when it is excited by a voltage source representing PD induced voltage. The currents are used to evaluate electric fields in the radial and azimuthal directions to show the existence of a non-TEM mode. The currents at the location of the voltage source and the coil terminal are compared in time and frequency domains and differences in terms of rise-times of the current pulses and the magnitude of high frequency components are elucidated.","PeriodicalId":250717,"journal":{"name":"2017 3rd International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115684829","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

A C breakdown voltage characteristics of synthetic ester based egg shell nano fluids 合成酯基蛋壳纳米流体的C击穿电压特性

2017 3rd International Conference on Condition Assessment Techniques in Electrical Systems (CATCON) Pub Date : 2017-11-01 DOI: 10.1109/CATCON.2017.8280195

P. Thomas, Nandini E Hudedmani

{"title":"A C breakdown voltage characteristics of synthetic ester based egg shell nano fluids","authors":"P. Thomas, Nandini E Hudedmani","doi":"10.1109/CATCON.2017.8280195","DOIUrl":"https://doi.org/10.1109/CATCON.2017.8280195","url":null,"abstract":"Power transformer play a very important role in the power sector and mineral oil has been used as insulating medium due to its availability and cost. However, it undergoes severe ageing due to the contaminants, oxygen and moisture results in the deterioration of insulating properties. To overcome these, various synthetic liquids were developed, which can withstand severe electrical stresses. Especially, synthetic esters, which are readily biodegradable, superior moisture tolerance, fire safety, and high load capabilities have attracted the utilities to make use of these fluids as an alternate to mineral oil for transformer applications. In recent years, in order to have improved critical parameters and heat transfer characteristics, nanofluids were considered the next generation insulting fluids. In this work, synthetic ester based nanofluids were prepared by employing egg shell nano particles, which would give rise to environmental friendly insulating liquids for the transformer applications. The Synthetic ester based egg shell nano fluids with various weight percent (0.001 to 0.005 wt %) of eggshell nano particles were prepared under ultrasonication. These nano fluids were evaluated for parameters such as AC breakdown voltage (BDV), loss tangent, dielectric permittivity, resistivity, Flash Point and acidity. The AC breakdown voltage (BDV) increased as the weight percent of eggshell nano particles increased. The effect of eggshell nano particles on the critical parameters were studied in detail and the same is discussed in this work.","PeriodicalId":250717,"journal":{"name":"2017 3rd International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127118868","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

Inter phase fault detection in inverter fed induction motor using wavelet transform 基于小波变换的变频异步电动机相间故障检测

2017 3rd International Conference on Condition Assessment Techniques in Electrical Systems (CATCON) Pub Date : 2017-11-01 DOI: 10.1109/CATCON.2017.8280193

B. A. Vinayak, Rahim Uddin, G. Jagadanaand

引用次数: 5

Application of artificial neural networks to monitor thermal condition of electrical equipment 人工神经网络在电气设备热状态监测中的应用

2017 3rd International Conference on Condition Assessment Techniques in Electrical Systems (CATCON) Pub Date : 2017-11-01 DOI: 10.1109/CATCON.2017.8280208

Surbhi Pareek, Ritam Sharma, Ranjan Maheshwari

{"title":"Application of artificial neural networks to monitor thermal condition of electrical equipment","authors":"Surbhi Pareek, Ritam Sharma, Ranjan Maheshwari","doi":"10.1109/CATCON.2017.8280208","DOIUrl":"https://doi.org/10.1109/CATCON.2017.8280208","url":null,"abstract":"Infrared thermography technology is nowadays one of the most efficient non-destructive testing techniques for diagnosing faults of electrical systems and components. Overheated components in electrical systems and equipment indicate a poor connection, overloading, load imbalance or any other defect. Employing Thermographic inspection for finding such heat-related problems before subsequent failure of the system is practised in several industries. However, an automatic diagnostic system based on artificial neural network enhances the functionality by decreasing the operating time, human efforts and also increases the reliability of the system. The present article proposes employing artificial neural network (ANN) for inspection of electrical components and classifying their thermal conditions into three classes namely normal, intermediate and critical. Two different sets of inputs were provided to the neural network classifier, firstly statistical data of the temperature profile obtained from thermal images and secondly histogram based first order statistical features along with the glcm based features and both are compared to get the performance of network created. The multilayered perceptron network (MLP) was used as the classifier and the performance of the network was compared to two different training algorithms, viz. Levenberg-Marquardt (LM) and Scaled Conjugate Gradient (SCG). The performances were determined in terms of percentage of accuracy by plotting the confusion matrix. It was found that MLP network trained using the SCG algorithm gives the highest percentage of accuracy of classification i.e., 91.5% for the Statistical data features of the temperature profile as compared to the other set of features.","PeriodicalId":250717,"journal":{"name":"2017 3rd International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128794697","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: 7

Design and development of high voltage 10ns rep-rate pulsar 高压10ns脉冲速率脉冲星的设计与研制

2017 3rd International Conference on Condition Assessment Techniques in Electrical Systems (CATCON) Pub Date : 2017-11-01 DOI: 10.1109/CATCON.2017.8280220

G. Kumar, A. Patel, Archana Sharma

引用次数: 2

Evaluating the effects of lower molecular weight acids in oil-paper insulated transformer 评价低分子量酸在油纸绝缘变压器中的作用

2017 3rd International Conference on Condition Assessment Techniques in Electrical Systems (CATCON) Pub Date : 2017-11-01 DOI: 10.1109/CATCON.2017.8280200

S. K. Ojha, P. Purkait, Sivaji Chakravorti

{"title":"Evaluating the effects of lower molecular weight acids in oil-paper insulated transformer","authors":"S. K. Ojha, P. Purkait, Sivaji Chakravorti","doi":"10.1109/CATCON.2017.8280200","DOIUrl":"https://doi.org/10.1109/CATCON.2017.8280200","url":null,"abstract":"Paper insulation breakdown of a transformer will directly result in the failure of its operation. Temperature variation in transformer initiates cellulose chain scission. Studies indicate that carboxylic acids are formed due to this scission in an aged transformer. Organic acids that are produced as byproduct is one of the key factors for insulation degradation in an oil-paper insulated transformer. Low molecular weight acids that are water soluble, prefer to stay in paper, which eventually affects the paper insulation, whereas the higher molecular weight acids are known to be fat soluble and affect the oil insulation. Along with the traditional methods which are used for condition monitoring, initiatives must be taken to understand the influence of acids generated inside the transformer. With a view to look into the detrimental effects of acids on the insulation status, organic acids are mixed in a definite proportion with transformer oil and the experimental results on an insulation sample are reported. An attempt has been made to correlate the dielectric test results with type and concentration of organic acids present in the transformer insulation system.","PeriodicalId":250717,"journal":{"name":"2017 3rd International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"1016 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134064946","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: 7