{"title":"An universal high voltage source based on a static frequency converter","authors":"F. Martin, T. Leibfried","doi":"10.1109/ELINSL.2006.1665347","DOIUrl":"https://doi.org/10.1109/ELINSL.2006.1665347","url":null,"abstract":"For testing electrical equipment the test voltage has to achieve special requirements, which are noted in the international standards. Tests showed that it's not possible to fulfil those requirements with a passive pulse pattern. This paper deals with the development of an electronic control unit for a static frequency converter. The focus is on the synthesis of the control and the obtained results after realizing in a static frequency converter with semiconductor valves","PeriodicalId":427638,"journal":{"name":"Conference Record of the 2006 IEEE International Symposium on Electrical Insulation","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124923388","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}
{"title":"Partial discharge erosion of nano-filled enameled wires subjected to high frequency waveforms","authors":"S. Ul Haq, S. Jayaram, E. Cherney, L. Simon","doi":"10.1109/ELINSL.2006.1665341","DOIUrl":"https://doi.org/10.1109/ELINSL.2006.1665341","url":null,"abstract":"The accelerated degradation under high frequency AC voltages of enameled wires that are nano-filled is compared to enameled wires without nano-fillers. The surface roughness and erosion depth of wire specimens, aged in the presence of partial discharge (PD), are studied using a scanning electron microscope (SEM). Changes in the chemical bonding behavior of wire insulation due to PD erosion, are also assessed by Fourier transform infrared spectroscopy (FTIR). A comparative evaluation of the residual life of the wires, aged under high frequency AC waveforms reveals that the newly developed nano-filled enameled wires, especially those with fumed silica, attain a life that is twice that of conventional wires, which is a significant improvement","PeriodicalId":427638,"journal":{"name":"Conference Record of the 2006 IEEE International Symposium on Electrical Insulation","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130349841","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}
{"title":"Measurement of resistive and absorption currents in capacitor films up to breakdown","authors":"Chunchuan Xu, S. Boggs","doi":"10.1109/ELINSL.2006.1665304","DOIUrl":"https://doi.org/10.1109/ELINSL.2006.1665304","url":null,"abstract":"An electronic system with active feedback has been developed to facilitate measurement of resistive currents in polymer films up to breakdown. The system cancels the capacitive current actively to facilitate the measurement of the resistive current. The measured current is the result of the very rapid relaxation from a capacitive field distribution to a resistive field distribution at very high fields approaching breakdown. If the material were truly homogeneous, the resistive and capacitive field distributions would be the same. Most polymers are semicrystalline, with crystallites which have much lower conductivity than the amorphous regions with the result that the capacitive and resistive distributions are not the same. Absorption current data up to breakdown (~700 V/m) are presented for biaxially oriented polypropylene (BOPP) made by both the tenter and bubble process. These data are compared with measurements of polystyrene capacitor film which is amorphous. Transient nonlinear finite element analysis computer simulations are presented in a companion paper","PeriodicalId":427638,"journal":{"name":"Conference Record of the 2006 IEEE International Symposium on Electrical Insulation","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130366357","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}
{"title":"Investigation of insulation failures in two old hydro power plants in Iran","authors":"M. R. Naghashan","doi":"10.1109/ELINSL.2006.1665247","DOIUrl":"https://doi.org/10.1109/ELINSL.2006.1665247","url":null,"abstract":"The cause of high difference number of insulation failures in two old hydro power plants in Iran is investigated. Results are introduced according to the comparative electrical and combined electrical, thermal and mechanical accelerated aging tests that are carried out on the old and spare generator bars","PeriodicalId":427638,"journal":{"name":"Conference Record of the 2006 IEEE International Symposium on Electrical Insulation","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129906967","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}
{"title":"The TSC characteristics of HTV composite insulators","authors":"Ying Liang, L. Ding, C.R. Li, Kun Yang","doi":"10.1109/ELINSL.2006.1665289","DOIUrl":"https://doi.org/10.1109/ELINSL.2006.1665289","url":null,"abstract":"This paper presents the thermally stimulated current (TSC) results obtained from an experiment which was carried out in order to identify the feasibility to evaluate the aging state of field HTV composite insulators by TSC technique. The test samples were prepared from four HTV composite insulators, which were randomly picked in-situ. The TSC experimental results show that the rough TSC shapes of four samples were similar despite different serving time, while the peak at high temperature area was only observed in one sample (insulator C). Further calculated results indicate that insulator C had the deepest trap level in our investigation. The performance difference between insulator C and the other three insulators can be obviously observed from the SEM morphologies, but is difficult to discern from their corresponding HC levels. Based on the above results, we can infer that although there are certain inner relations between the TSC characteristics of HTV composite insulators and their hydrophobicity, comparing to the later, the former is more sensitive to the aging performance under some conditions. Also the aging states of field HTV composite insulators have no direct relations with the servicing time in our investigation, when the TSC characteristics are taken into account","PeriodicalId":427638,"journal":{"name":"Conference Record of the 2006 IEEE International Symposium on Electrical Insulation","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122905685","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}
{"title":"High frequency behavior of AC machine: application of turn insulation aging diagnostic","authors":"F. Perisse, P. Werynski, D. Roger","doi":"10.1109/ELINSL.2006.1665379","DOIUrl":"https://doi.org/10.1109/ELINSL.2006.1665379","url":null,"abstract":"The stator insulation breakdown is a major cause of AC machine failures. Ground insulation defaults are easily detected by classical systems based on the leakage current measurements, however the turn to turn insulation degradations are more difficult to detect. For large machines, on-line methods, based on partial discharge detection and analysis, give good results but they cannot be used for low-voltage machines fed by adjustable speed drives (ASD). This paper presents a new monitoring system able to detect slight variations of high frequency resonances in the winding of a working machine fed by an industrial inverter. The new system works in association with statistical data on the accelerated aging of the magnet wire","PeriodicalId":427638,"journal":{"name":"Conference Record of the 2006 IEEE International Symposium on Electrical Insulation","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124134336","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}
{"title":"PD pulse propagation in shielded power cable for symmetric and asymmetric PD pulses","authors":"N. Oussalah, Y. Zebboudj, S. Boggs","doi":"10.1109/ELINSL.2006.1665250","DOIUrl":"https://doi.org/10.1109/ELINSL.2006.1665250","url":null,"abstract":"Partial discharge is a useful diagnostic method for a wide range of power apparatus. In the case of shielded power cable, partial discharge can detect workmanship-induced defects in accessories, as well as cavities and electrical trees in the dielectric. Shielded power cables can be considered lossy transmission lines. The high frequency attenuation of the cable causes the peak amplitude of a PD pulse, as well as the pulse energy, to decrease as a function of distance propagated. We develop analytical expressions which characterize the PD pulse propagation in a typical shielded power cable for both symmetric and asymmetric PD pulses for an attenuation constant which increases linearly with frequency, as is normally the case for shielded solid dielectric power cable","PeriodicalId":427638,"journal":{"name":"Conference Record of the 2006 IEEE International Symposium on Electrical Insulation","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130773350","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}
{"title":"Classification of partial discharge signals by means of auto-correlation function evaluation","authors":"A. Contin, S. Pastore","doi":"10.1109/ELINSL.2006.1665317","DOIUrl":"https://doi.org/10.1109/ELINSL.2006.1665317","url":null,"abstract":"A new algorithm for the separation of partial discharge (PD) signals due to multiple sources is presented in this paper. It evaluates the similarity of the signals shape by comparing their auto-correlation functions (ACFs), on the assumption that the same PD source can exhibit signals having similar ACFs. The new classification algorithm is based on a modified K-mean clustering (KMC) method. A laboratory test of the proposed algorithm is reported. The proposed classification method may constitute a step forward in the automatic signal separation","PeriodicalId":427638,"journal":{"name":"Conference Record of the 2006 IEEE International Symposium on Electrical Insulation","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126790558","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}
Kenneth Pedersen, H. Sedding, M. Fenger, J. Holboell, M. Henriksen
{"title":"Laboratory results from dielectric spectroscopy of field aged XLPE cables with respect to water trees","authors":"Kenneth Pedersen, H. Sedding, M. Fenger, J. Holboell, M. Henriksen","doi":"10.1109/ELINSL.2006.1665368","DOIUrl":"https://doi.org/10.1109/ELINSL.2006.1665368","url":null,"abstract":"This paper deals with the application of frequency domain dielectric spectroscopy for the detection of water trees in XLPE cables. During the research, dielectric spectroscopy measurements have been carried out on cable samples with and without water trees while it was attempted to preserve many of the uncertainties present in the field. The experiments support the applicability of a high voltage test developed primarily at KTH in Sweden, which utilizes the nonlinearity of the dissipation factor. Subsequently it was investigated whether this high voltage method also seems reliable at low voltages. It turned out that the fundamentals of the high voltage method were not directly applicable at low voltages as the nonlinearity of the permittivity is not noticeable at low voltages, at least compared to the deviations. Instead a novel method for interpreting the low frequency measurements is proposed though it needs further verification. Finally a theoretically possible modification of the measurement system is proposed, which deals with the problem of a limited current capability of the amplifier","PeriodicalId":427638,"journal":{"name":"Conference Record of the 2006 IEEE International Symposium on Electrical Insulation","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116962827","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}
{"title":"Thermal model for power transformers dynamic loading","authors":"A. Elmoudi, M. Lehtonen, H. Nordman","doi":"10.1109/ELINSL.2006.1665295","DOIUrl":"https://doi.org/10.1109/ELINSL.2006.1665295","url":null,"abstract":"This paper presents a thermal model of a power transformer in the form of simple equivalent circuit. The model is established to calculate the top oil and hot spot temperatures. The model parameters are obtained from manufacturer test data and an electromagnetic analysis using finite element method (FEM). The model results are compared with measured data obtained from 250 MVA, 230plusmn8times1.5%/118/21 kV ONAF transformer equipped with fiber optic probes and tested according to a load cycle comprising a short time load up to 2.1 pu. The results are additionally compared with the conventional equations of the IEEE clause 7","PeriodicalId":427638,"journal":{"name":"Conference Record of the 2006 IEEE International Symposium on Electrical Insulation","volume":"156 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124372388","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}