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Simulation of ultrasonic wave propagation of partial discharge in transformer model 超声波在变压器局部放电模型中的传播仿真
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973819
Ryotaro Ozaki, A. O. Akumu, H. Ihori, M. Fujii, F. Arii
{"title":"Simulation of ultrasonic wave propagation of partial discharge in transformer model","authors":"Ryotaro Ozaki, A. O. Akumu, H. Ihori, M. Fujii, F. Arii","doi":"10.1109/ISEIM.2001.973819","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973819","url":null,"abstract":"The location of partial discharges is attempted by using the ultrasonic wave of partial discharges. At present, the experiment is carried out in the simple model of the transformer. Peaks of the simulated ultrasonic wave appeared in the time which was almost equal to peaks of actual ultrasonic wave. And, the ratio of the amplitude of the ultrasonic wave was also almost in agreement. The simulation was able to reproduce the ultrasonic wave by partial discharge in two dimensions. The experimental system was simulated, and the transmission was confirmed in two dimensions.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"92 1","pages":"880-883"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74072110","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
Spectroscopic studies of metal/organic interface by nonlinear optical methods 非线性光学方法对金属/有机界面的光谱研究
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973725
T. Manaka, X. Chen, C.Q. Li, M. Iwamoto
{"title":"Spectroscopic studies of metal/organic interface by nonlinear optical methods","authors":"T. Manaka, X. Chen, C.Q. Li, M. Iwamoto","doi":"10.1109/ISEIM.2001.973725","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973725","url":null,"abstract":"We report SHG observation from CuttbPc LB films deposited on glass, Al and Au substrates and the spectroscopic investigation of the SHG signal on Al and Au surfaces. The possible mechanisms of the SHG enhancement are increase of the electric field inside the medium due to reflection from the Al interface (quadrupole process) and applying the electrostatic field to the centrosymmetric Pc layer due to the surface potential (dipole process). Taking into account the fact that the susceptibility for the static field tends to be smaller than that for the optical frequency, the electric field of the pulsed laser on the order of 1W V/cm is comparable with the field of the surface potential. In order to separate these possibilities, we investigate the spectroscopic characterization of the SHG for phthalocyanine LB films.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"110 1","pages":"549-552"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79265329","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
Studies on the effect of influencing factors on condition monitoring of HV substation equipment 影响因素对高压变电设备状态监测的影响研究
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973787
B. Shi, Li Yang, Hongbing Wang
{"title":"Studies on the effect of influencing factors on condition monitoring of HV substation equipment","authors":"B. Shi, Li Yang, Hongbing Wang","doi":"10.1109/ISEIM.2001.973787","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973787","url":null,"abstract":"A new on-line insulation monitoring system for HV instrument transformers, power transformers, bushings and MOA is presented first. Then the influence of some factors on the monitored results is analyzed through experiments. The influencing factors include potential transformers, adjacent phase apparatus and ambient factors. Based on the experimental results and analyses, an online insulation diagnosis expert system for HV apparatus is developed.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"18 1","pages":"753-756"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85238388","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
Effects of liquid chemicals on space charge evolution in low-density polyethylene 液体化学品对低密度聚乙烯空间电荷演化的影响
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973570
R. Minami, N. Hirai, Y. Ohki, M. Okashita, T. Maeno
{"title":"Effects of liquid chemicals on space charge evolution in low-density polyethylene","authors":"R. Minami, N. Hirai, Y. Ohki, M. Okashita, T. Maeno","doi":"10.1109/ISEIM.2001.973570","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973570","url":null,"abstract":"Crosslinked polyethylene (XLPE) cables are widely used for ac transmission. However, for dc transmission, they are still under feasibility study due to severe concern about space charge. In the bulk of XLPE insulated cables, there remain chemicals such as acetophenone and /spl alpha/-methylstyrene. Several kinds of investigations on the effect of acetophenone on the space charge distribution in polyethylene (PE) have been done. In the present paper, the effects of acetophenone, /spl alpha/-methylstyrene, and cumylalcohol on the space charge evolution in PE have been compared by measuring charge distributions and dc conduction currents in soaked PE sheets.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"49 1","pages":"87-90"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79446024","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
Light spectra on AC corona [insulation condition monitoring] 交流电晕光谱[绝缘状态监测]
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973585
Chen Shixiu, Y. Qinghua, X. Shisheng, Cai Wei, Shen Yuanmao
{"title":"Light spectra on AC corona [insulation condition monitoring]","authors":"Chen Shixiu, Y. Qinghua, X. Shisheng, Cai Wei, Shen Yuanmao","doi":"10.1109/ISEIM.2001.973585","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973585","url":null,"abstract":"In order to detect and monitor power apparatus insulation by means of measuring light spectra radiated from partial discharges, the characteristics of light spectra radiated from corona should be found out first. Previously, we have measured light spectra radiated from DC corona. The light spectra from AC corona are presented in this paper. The measured spectra range from 250 nm to 800 nm, and show some similarities to those from DC corona. The results of this experiment show that it is possible to detect and monitor insulation condition by measuring the light spectra radiated from partial discharge in air.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"23 1","pages":"134-136"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83263443","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 principle and method of the protection of transformer longitudinal insulation 变压器纵向绝缘保护的原理和方法
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973804
Wen Yuan-fang, Yan Xianglian, Liu Chun, Liang Yuelong, Xie Yanying
{"title":"A principle and method of the protection of transformer longitudinal insulation","authors":"Wen Yuan-fang, Yan Xianglian, Liu Chun, Liang Yuelong, Xie Yanying","doi":"10.1109/ISEIM.2001.973804","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973804","url":null,"abstract":"In this paper, the inner protection effect of MOVs parallel to multi-section of continuous windings is studied by testing. A principle and method of the protection of transformer longitudinal insulation are also presented. This paper introduces the lifetime test procedure of MOV in high temperature oil.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"29 1","pages":"821-824"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82217367","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
Reduction of micro-defects in the inter-metal dielectrics (IMD) chemical mechanical polishing (CMP) for ULSI applications 减少金属间电介质(IMD)化学机械抛光(CMP)在ULSI应用中的微缺陷
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973558
Sung-Woo Park, Sang-Yong Kim, Yong-jin Sin
{"title":"Reduction of micro-defects in the inter-metal dielectrics (IMD) chemical mechanical polishing (CMP) for ULSI applications","authors":"Sung-Woo Park, Sang-Yong Kim, Yong-jin Sin","doi":"10.1109/ISEIM.2001.973558","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973558","url":null,"abstract":"In this work, we studied the relationship between defect generation and pad count to understand the exact efficiency of the slurry filtration, and to find out the appropriate pad usage. Our experimental results showed that it is impossible to prevent defect-causing particles perfectly through the depth-type filter. Thus, we suggest that it is necessary to optimize flow rate of slurry and to install the high spray bar of de-ionized water (DIW) with high pressure, in order to overcome weak-points of POU depth type filter.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"26 1","pages":"63-66"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78596909","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
Error analysis for dielectric loss factor measurement based on harmonic analysis 基于谐波分析的介质损耗因数测量误差分析
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973664
Yang Minzhong, L. Shaoyu, Wang Zhuo, Yan Zhang
{"title":"Error analysis for dielectric loss factor measurement based on harmonic analysis","authors":"Yang Minzhong, L. Shaoyu, Wang Zhuo, Yan Zhang","doi":"10.1109/ISEIM.2001.973664","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973664","url":null,"abstract":"Dielectric loss measurement is an important index in assessing the insulation performance of power equipment. With the development of condition-based maintenance, the on-line diagnostic technologies for dielectric loss measurement are regarded more and more. Many methods have been developed in this field in which harmonic analysis is prevalent due to its perfect performance of resisting disturbance and stability relative to others Harmonic analysis includes measuring the operating voltage and the current of the specimen by some sensors firstly, then transforming the analog signal into digital signal. Finally the dielectric loss angle could be calculated by means of digital frequency analysis. According to the digital spectrum analysis theory, accurate analysis can be conducted if the sampling length is the integral multiple of the signal cycle. Actually, as the frequency of power system is often fluctuant, the condition of the sampling of integral multiple is difficult to satisfy. Therefore the frequency fluctuation is an important factor which greatly influences the precision of dielectric loss detection based on harmonic analysis. Discrete Fourier transform (DFT) is the most fundamental method in digital spectrum analysis but is too difficult to use conveniently. So a new method, quadrature filtering algorithm, is used in this paper. Then, two preprocessing methods to improve the precision of dielectric loss detection are put forward.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"119 10 1","pages":"336-339"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90252552","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
Estimating the remaining BDV for large generator stator winding by using nondestructive insulation diagnostic data based on statistical method 利用基于统计方法的无损绝缘诊断数据估计大型发电机定子绕组剩余电压
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973771
Z. Jia, Y.Y. Liu, Y. Hao, H. Xie
{"title":"Estimating the remaining BDV for large generator stator winding by using nondestructive insulation diagnostic data based on statistical method","authors":"Z. Jia, Y.Y. Liu, Y. Hao, H. Xie","doi":"10.1109/ISEIM.2001.973771","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973771","url":null,"abstract":"The actual stator bars of 18 kV/300 MW generator are used for accelerated multi-stress aging experiments to investigate the relationship between the remaining breakdown voltage (BDV) and the nondestructive insulation diagnostic data. At the end of aging experiment, AC breakdown test is done to the bars after their nondestructive data has been measured. The BDV data fits Weibull distribution. The correlation between dissipation factor, the PD parameter and breakdown voltage has been analyzed, among which the skewness of average discharge has the most correlation with breakdown voltage. Regression analysis is carried on using step-by-step multiple regression method and a mathematical expression is extracted, which can be used to predict the breakdown voltage.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"17 1","pages":"689-692"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87788799","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
Research on the influence of microorganism on tan /spl delta/ of power transformer oil 微生物对电力变压器油tan /spl δ /影响的研究
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973805
Weiping Ma, Fangxiao Cheng, Shaoying Li, Piao Zhensan, Xianzhong Liu, Yao Lili
{"title":"Research on the influence of microorganism on tan /spl delta/ of power transformer oil","authors":"Weiping Ma, Fangxiao Cheng, Shaoying Li, Piao Zhensan, Xianzhong Liu, Yao Lili","doi":"10.1109/ISEIM.2001.973805","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973805","url":null,"abstract":"The first discusses electric engineering theory and te technical question as to which tan /spl delta/ increase and the level of insulation decrease lead to microorganisms in transformer oil. The microorganism is successfully separated from the oil with self-made optional nutrient medium. The conclusion shows that the stranger ability of biological oxidization exists in oil and the charged bacteria and polarity in metabolic process directly affect the characteristic of insulation.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"462 1","pages":"825-828"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87793598","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
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