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Test facility of multi-factors aging for stator bars insulation of generator and design of specimens 发电机定子棒绝缘多因素老化试验装置及试样设计
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973768
Xiaohong Zhang, Weisheng Lu, Liang Zhang, Bo Yue, Hengkun Xie
{"title":"Test facility of multi-factors aging for stator bars insulation of generator and design of specimens","authors":"Xiaohong Zhang, Weisheng Lu, Liang Zhang, Bo Yue, Hengkun Xie","doi":"10.1109/ISEIM.2001.973768","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973768","url":null,"abstract":"In the present work, a new test facility of combined triple stresses aging for stator bars insulation of a generator was introduced. The facility can efficiently stimulate the three stresses, which are imposed on stator bar insulation of a generator in operation, and conduct a single factor, combined double factors and/or triple factors aging test at random. In order to satisfy the different requirements put forward to specimens in different measurement and consider the fact that mechanical stresses are applied differently at the local bar, test bars are divided into several specimen pieces and treated in different ways. The results of PD detection performed on different specimens subjected to electrical, combined electro-thermal or combined three factors aging, respectively, have given sufficient information on the synergistic effect of electrical and thermal, mechanical stresses on stator bar insulation with mica/epoxy aging. It is proved that the aging facility and specimens adopted are more perfect.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"7 1","pages":"681-684"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83741909","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: 2
Ultrasonic nondestructive detection for defects in epoxy/mica insulation 环氧/云母绝缘缺陷的超声无损检测
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973767
Y. Hao, Guoli Wang, Hengkun Xie
{"title":"Ultrasonic nondestructive detection for defects in epoxy/mica insulation","authors":"Y. Hao, Guoli Wang, Hengkun Xie","doi":"10.1109/ISEIM.2001.973767","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973767","url":null,"abstract":"The detection and recognition of defects in insulation is a significant investigation for insulation diagnosis. In our laboratory, an ultrasonic testing system has been developed and used for insulation diagnosis of large generators. Using this system with lower frequency transducers, experiments were performed on actual stator bars. The results showed that, the 0.5/spl sim/1.2 MHz frequency transducers could be used for the manufacturing quality test of stator bars. The 0.5/spl sim/0.8 MHz transducers are more effective for aging assessment of aged stator bars. They are sensitive to the degradation and the internal mechanical damages of aged stator insulation.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"1 1","pages":"677-680"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82830843","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: 5
Study on aging extent of stator insulation in a large turbogenerator 某大型汽轮发电机定子绝缘老化程度研究
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973784
Weisheng Lu, Xiaoqin Ma, Hengkun Xie
{"title":"Study on aging extent of stator insulation in a large turbogenerator","authors":"Weisheng Lu, Xiaoqin Ma, Hengkun Xie","doi":"10.1109/ISEIM.2001.973784","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973784","url":null,"abstract":"Different portions of stator insulation are subjected to multistresses with different strength during the operation of large generators. In order to study the aging extent of stator insulation in different portions, diagnostic tests are performed on the specimens from stator bars of a large turbogenerator, which has operated for 16 years. The tests include, polarization index test, dielectric loss measurement at various voltages and temperatures, AC current measurement, partial discharge test and acoustic detection. The test results are discussed and it is shown that the aging extent of stator insulation of end windings is more serious than that of the insulation in the slots. Results also indicate that end windings were subjected to stronger stresses than the slot portions of coils were. Finally, the suggestion could be made that during predictive maintenance testing of large turbogenerators, more attention should be drawn to the insulation of endwindings.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"1 1","pages":"741-744"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87649684","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: 0
Degradation diagnosis of large stator winding insulation based on ultra-wide band partial discharge detecting technique 基于超宽带局部放电检测技术的大型定子绕组绝缘退化诊断
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973773
Z. Jia, H. Xie
{"title":"Degradation diagnosis of large stator winding insulation based on ultra-wide band partial discharge detecting technique","authors":"Z. Jia, H. Xie","doi":"10.1109/ISEIM.2001.973773","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973773","url":null,"abstract":"There are two topics that are of particular interest to the workers in the field of partial discharge (PD). One is the impact of a wide variety of statistical tools on the interpretation of discharge data obtained with standard PD detection apparatus according to IEC 270. The other is the study of discharge-induced degradation processes by looking into the physics of the discharge process. Ultra-wide band (UWB) PD detecting technique is introduced to measure the PD pulse of the bar sample during aging. The data obtained are analyzed using joint time-frequency analysis (JTFA) methods, that is, short-time fourier transformation (STFT), Wigner distribution (DWD) and Gabor spectrogram (DGS), and finally Gabor spectrum is selected to analyze the characteristics of single impulse wave in different aging period. The results of analysis indicate that following the increasing of aging time, the high-frequency component of single impulse wave continuously increased, while the energy of discharge alternated from low-frequency long time lag to high-frequency short time lag and high-frequency long time lag.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"110 1","pages":"697-700"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84764684","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
Morphology change and tree initiation of polyethylene 聚乙烯的形态变化与树形形成
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973750
P. Yan, Yuanxiang Zhou, G. Sun, N. Yoshimura
{"title":"Morphology change and tree initiation of polyethylene","authors":"P. Yan, Yuanxiang Zhou, G. Sun, N. Yoshimura","doi":"10.1109/ISEIM.2001.973750","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973750","url":null,"abstract":"Electrical trees are greatly influenced by the morphological structure in semi-crystalline polymers. In this paper, samples of polyethylene (PE) films have been annealed. The electrical tree initiation voltages of these samples also have been measured. It was found that the thickness of lamellae is the important parameter that affects the tree initiation. It was also found that the thermal stability could be related to the thickness of lamellae. It was considered that the larger the thickness of lamellae, the higher the thermal stability, which results in the more difficult tree initiation.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"56 1","pages":"631-634"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81912664","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 low cost approach to design the Tesla transformer for testing of insulating materials 设计用于绝缘材料测试的特斯拉变压器的低成本方法
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973663
C. Boonseng, P. Apiratikul
{"title":"A low cost approach to design the Tesla transformer for testing of insulating materials","authors":"C. Boonseng, P. Apiratikul","doi":"10.1109/ISEIM.2001.973663","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973663","url":null,"abstract":"A high voltage with high frequency oscillation waveshape is used as a standard test for electrical power equipment. A Tesla transformer is one of the sources that can generate such a waveshape. This paper presents a design and a construction of a Tesla transformer used in insulator tests. The output of the transformer has a rate of 200 kV and 200 kHz. The output waveshape is controlled based on the L-C resonance circuit. The transformer is implemented for insulator tests. It is found that the accuracy of the output obtained from the Tesla transformer is in the satisfactory level.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"36 1","pages":"332-335"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81357546","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
Numerical analysis on electric field and taping for stator coil with global insulation 全局绝缘定子线圈电场及包带的数值分析
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973754
N. Akinobu, S. Inoue, K. Haga
{"title":"Numerical analysis on electric field and taping for stator coil with global insulation","authors":"N. Akinobu, S. Inoue, K. Haga","doi":"10.1109/ISEIM.2001.973754","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973754","url":null,"abstract":"The electrical and mechanical characteristics of our global insulation system (F-resin/G II insulation system) have been introduced in the several papers. In order to perform the optimal insulation design, a quantitative analysis of stator coil with global VPI insulation of generators is required, and therefore electric field strength of current coils was analyzed utilizing the finite element method (FEM) in this time. In the other hand, quality of coil insulation is dependent upon not only materials used but also manufacturing method. In particular, since a taping method of insulation affects the break down voltage (BDV) of coils, the optimum state thereof should be seized. Based on the above, the optimum state of taping was determined through a unique analysis program. The numerical analysis results are reflected to current stator coils with global insulation system contributing to the upgrading of insulation.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"9 1","pages":"641-644"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89213683","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
Transient current and space charge behavior due to double injection 双注入引起的瞬态电流和空间电荷行为
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973698
K. Kaneko, Y. Suzuokit, T. Mizutani
{"title":"Transient current and space charge behavior due to double injection","authors":"K. Kaneko, Y. Suzuokit, T. Mizutani","doi":"10.1109/ISEIM.2001.973698","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973698","url":null,"abstract":"It is well known that space charges in low-density polyethylene (LDPE) consist of two or more kinds of charge carriers in many cases. We simulated the space charge motion due to double injection by computer simulation and discussed the space charge formation and the transient current by changing the rates of injection. The simulated space charge distribution agreed with the observed one after long-time charging. The differences of transient properties between the experimental and simulated results suggested the field dependence of carrier mobilities.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"1 1","pages":"444-447"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88564251","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
Study on the shape of suspension insulators influencing development of discharge 悬浮绝缘子形状对放电发展影响的研究
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973649
W. Sima, Caixin Sun, L. Gu, Xinliang Jiang, Mingying Chen
{"title":"Study on the shape of suspension insulators influencing development of discharge","authors":"W. Sima, Caixin Sun, L. Gu, Xinliang Jiang, Mingying Chen","doi":"10.1109/ISEIM.2001.973649","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973649","url":null,"abstract":"Based on complex charge simulation method, this paper presents three-dimensional electrostatic models of a suspension insulator with clearing, pollution, dry belt and local arc appearing along insulator surface. By calculating the electric field of the suspension insulator surface, the shape of the suspension insulator's influence on local arc development is analyzed. The relation between the shape of the insulator and the development of the local arc is studied. The process of local arc development and the edge of the suspension insulator influences greatly the development of the local arc. The results can provide a theoretical basis for the shape of insulator.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"18 1","pages":"290-292"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86422461","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 general model for life estimation of cables under DC stress with voltage-polarity inversions accounting for space-charge effects 考虑空间电荷效应的电压极性反转直流应力下电缆寿命估计的一般模型
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973699
A. Cavallini, D. Fabiani, G. Mazzanti, G. Montanari
{"title":"A general model for life estimation of cables under DC stress with voltage-polarity inversions accounting for space-charge effects","authors":"A. Cavallini, D. Fabiani, G. Mazzanti, G. Montanari","doi":"10.1109/ISEIM.2001.973699","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973699","url":null,"abstract":"This paper proposes a new model which provides the life estimation of polymeric insulation subjected to dc stress, with or without voltage reversals, on the basis of accelerated life tests carried out at constant dc stress and measurements of space charges. Accordingly, the performance of a new material under dc electrical stress can be characterised by short-term tests, so that, for example, the expected life of a cable can be evaluated once the rate of voltage reversals expected during its life has been guessed. The model is applied to results of tests carried out on polyethylene materials.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"5 1","pages":"449-452"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77794113","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
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