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Changes of capacitance and dielectric dissipation factor of water-treed XLPE with voltage 水树型交联聚乙烯的电容和介电损耗系数随电压的变化
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973702
T. Ozaki, N. Ito, I. Sengoku, J. Kawai, S. Nakamura
{"title":"Changes of capacitance and dielectric dissipation factor of water-treed XLPE with voltage","authors":"T. Ozaki, N. Ito, I. Sengoku, J. Kawai, S. Nakamura","doi":"10.1109/ISEIM.2001.973702","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973702","url":null,"abstract":"In this article, the changes of capacitance C and dielectric dissipation factor tan /spl delta/ of a non-penetrated water-treed XLPE sheet sample with voltage stress are discussed based upon the channel dynamism model. It has been found that the increase in tan /spl delta/ with high voltage stress is caused by the growth of the conductive water-filled channel layer. The gradual decrease in tan /spl delta/ with time of exposure to voltage stress is explained by a shift of relaxation frequency to higher range caused by the change in the conductivity of the water-filled channel layer.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"12 1","pages":"459-462"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77547193","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: 9
Relation between the ac loss current method and the PEA method for water-treed length 交流损耗电流法与PEA法计算水树长度的关系
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973718
N. Ito, T. Ozaki, I. Sengoku, J. Kawai, S. Nakamura
{"title":"Relation between the ac loss current method and the PEA method for water-treed length","authors":"N. Ito, T. Ozaki, I. Sengoku, J. Kawai, S. Nakamura","doi":"10.1109/ISEIM.2001.973718","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973718","url":null,"abstract":"Change of ac loss current through a non-penetrated water-treed XLPE sheet sample with applied voltage has been studied based on a model. In the model, the conductance of the water-filled channel layer is assumed to exhibit a nonlinear dependence on voltage. The observed changes of the magnitude and phase of the fundamental current and the third harmonic component can be well fitted by the model. It is found that the length of the water-filled channel layer approaches that of the water-treed region estimated by the PEA method at 2 kV stress. It is also found that the length of the water-filled channel layer obtained by the ac loss current method has a good correlation with the length of the water-treed region estimated by the PEA method.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"151 1","pages":"524-527"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73458759","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
Microwave dielectric properties of MgTiO/sub 3/-BaTiO/sub 3/ ceramics MgTiO/sub - 3/-BaTiO/sub - 3陶瓷的微波介电性能
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973574
Eui-Sun Choi, Young Hie Lee, S. Bae
{"title":"Microwave dielectric properties of MgTiO/sub 3/-BaTiO/sub 3/ ceramics","authors":"Eui-Sun Choi, Young Hie Lee, S. Bae","doi":"10.1109/ISEIM.2001.973574","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973574","url":null,"abstract":"The (1-x)MgTiO/sub 3/-xBaTiO/sub 3/(X=0.02/spl sim/0.1) ceramics were fabricated by the conventional mixed oxide method. The structural and microwave dielectric properties were investigated by the XRD, SEM, EDS and network analyzer. The sintering temperature and time were 1275/spl deg/C-1350/spl deg/C, 2 hours, respectively. In the XRD results of (1-x)MgTiO/sub 3/-xBaTiO/sub 3/ ceramics, the hexagonal BaMg/sub 6/Ti/sub 6/O/sub 19/ and ilmenite MgTiO/sub 3/ structures were coexisted. In the case of the 0.9MgTiO/sub 3/-0.1BaTiO/sub 3/ ceramics sintered at 1325/spl deg/C, dielectric constant, quality factor and temperature coefficient of resonant frequency were 32.67, 32665, -84.5 ppm//spl deg/C, respectively.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"PP 1","pages":"99-102"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84337342","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
Attenuation recovery technique for acoustic wave propagation in PEA method PEA方法中声波传播衰减恢复技术
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973688
Y. Tanaka, K. Hanawa, K. Suzuki, T. Takada
{"title":"Attenuation recovery technique for acoustic wave propagation in PEA method","authors":"Y. Tanaka, K. Hanawa, K. Suzuki, T. Takada","doi":"10.1109/ISEIM.2001.973688","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973688","url":null,"abstract":"The PEA (pulsed electro-acoustic) and PWP (pressure wave propagation) methods are widely used effective techniques for measurement of space charge distribution in dielectric materials. Since these techniques are using pressure waves as a detecting signal, however, it is inevitable to be affected by an attenuation effect of pressure wave propagation especially when the space charge distribution in a thick sample is measured using these techniques. Therefore, it is necessary to develop a recovery technique of attenuation effect when we would like to measure the space charge distribution in thick insulating materials such as power cable. In this report we are attempting to make a simple data processing technique using a simple model. The improved technique makes the data processing time shorter. Typical recovered data obtained using improved technique will be introduced.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"76 1","pages":"407-410"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87862294","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: 18
Advanced PD noise suppression and its relevance for computer aided PD defect identification 先进PD噪声抑制及其在计算机辅助PD缺陷识别中的应用
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973545
H. Kranz
{"title":"Advanced PD noise suppression and its relevance for computer aided PD defect identification","authors":"H. Kranz","doi":"10.1109/ISEIM.2001.973545","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973545","url":null,"abstract":"Digital partial discharge (PD) defect identification has become state of the art. But computer aided procedures based on pattern recognition principles are negatively effected by pulse-shaped disturbances. It is pointed out that a sufficient noise suppression and noise resistivity is a must for automated diagnosis. A novel approach is presented, which improves the defect identification on-site at noisy conditions. The benefits and limits of expert diagnosis compared to machine intelligent systems are discussed. Experimental results are presented, taken into account hard- and software noise suppression components. It is shown that PD defect identification at operating voltages and respectively disturbed data is still a challenge. A method of resolution with an intelligent neural noise filter and noise resistant diagnosis concepts are discussed.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"23 1","pages":"11-19"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90326031","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
Mechanochemical actuators fabricated from polypyrrole films with anisotropy 各向异性聚吡咯薄膜制备的机械化学致动器
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973764
Y. Kato, T. Okamoto, K. Tada, M. Onoda
{"title":"Mechanochemical actuators fabricated from polypyrrole films with anisotropy","authors":"Y. Kato, T. Okamoto, K. Tada, M. Onoda","doi":"10.1109/ISEIM.2001.973764","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973764","url":null,"abstract":"Polypyrrole (PPy) pipe was electrochemically polymerized in a Teflon slender pipe. It was found that a PPy film cut from the PPy pipe has anisotropy in conductivity as well as in morphology, and bends and reverts in a regular direction during redox cycles. That is, the anisotropic PPy film can be used as an actuator. We have investigated the bending behavior of the PPy actuator in various electrolytes and have found that incorporation of cations into PPy upon reduction plays a key role in the bending behavior. A mechanism of the bending behavior based on the cations transport as well as the anisotropic volume change upon doping is proposed.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"86 1","pages":"669-672"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90327635","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
The change of microstructure of epoxy mica insulation in multi-stress aging 环氧云母绝缘材料在多应力老化过程中的微观结构变化
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973772
Z. Jia, H. K. Xie
{"title":"The change of microstructure of epoxy mica insulation in multi-stress aging","authors":"Z. Jia, H. K. Xie","doi":"10.1109/ISEIM.2001.973772","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973772","url":null,"abstract":"The epoxy mica insulation system has been in service as the main insulation of large generator since 1960s. The real stator bars of an 18 kV/300 MW generator are used for accelerated multi-stress aging experiments to investigate their changes of microstructure of epoxy mica insulation. The stator insulation of a large generator is a composition system composed of epoxy resin, mica and glassfiber. A study on interface of the composite is significant for overall comprehension of its properties. A scanning electronic microscope is used to observe the pattern of interface during the aging process, and it is brought up that change in interface is the main reason of aging. The variation of components in insulation is also analyzed by the technique of infrared spectrum and X-ray energy spectrum. The results of experiment show that the epoxy resin causes hydrolytic reaction, the mica undergoes structural change.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"11 1","pages":"693-696"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89641177","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
Detecting loose stator wedges in large motors 检测大型电机中松动的定子楔
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973769
Xiaoqin Ma, Weisheng Lu, Hengkun Xie
{"title":"Detecting loose stator wedges in large motors","authors":"Xiaoqin Ma, Weisheng Lu, Hengkun Xie","doi":"10.1109/ISEIM.2001.973769","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973769","url":null,"abstract":"This paper presents test results obtained from studies aimed at determining whether the acoustic method, a nondestructive test technique based on the use of transient stress waves, can be used to detect the loose stator wedges. During the detection, mechanical impact is applied on the wedges and the responses are recorded by a microphone. Frequency analysis is performed in order to provide a description of the signal in frequency domain. It is shown that characteristic frequency in acoustical spectrum is the key to detecting loose stator wedges. Results also show that amplitude of the characteristic frequency increases corresponding to the looseness of wedges. Besides analysis of the test results, this study successfully introduces a thin plate resonator model for analyzing the response of a loose wedge when an impact is performed. The value of characteristic frequency is calculated for better interpretation of the detection results.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"11 1","pages":"685-688"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88674960","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
Simulation test of suppressing VFT in GIS by ferrite rings 铁氧体环抑制GIS中VFT的仿真试验
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973631
W.D. Liu, L.J. Jin, J. Qian
{"title":"Simulation test of suppressing VFT in GIS by ferrite rings","authors":"W.D. Liu, L.J. Jin, J. Qian","doi":"10.1109/ISEIM.2001.973631","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973631","url":null,"abstract":"Low voltage simulation tests were performed to investigate the possibility of suppressing very fast transients (VFT) in gas insulated substations (GIS) by ferrite rings. It is shown in the tests that putting ferrite rings around a conductor can change its wave impedance and damp the travelling waves propagating through. This suppression effect depends on the characteristics of the ferrite materials, including high frequency response, magnetic conductivity, loss and saturation.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"48 1","pages":"245-247"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90639245","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: 10
Surface flashover strength of different insulating materials in N/sub 2/-SF/sub 6/ gas mixtures under combined AC/DC voltages 交直流复合电压下N/sub - 2/-SF/sub - 6/气体混合物中不同绝缘材料的表面闪络强度
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973641
J. Sundara Rajan, K. Dwarakanath, N. Srinivasan
{"title":"Surface flashover strength of different insulating materials in N/sub 2/-SF/sub 6/ gas mixtures under combined AC/DC voltages","authors":"J. Sundara Rajan, K. Dwarakanath, N. Srinivasan","doi":"10.1109/ISEIM.2001.973641","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973641","url":null,"abstract":"Performance of insulating spacers in SF/sub 6/-N/sub 2/ gas mixture will be an important design factor in deciding the choice of spacer materials. In this study, 5 different polymers have been comparatively evaluated for surface flashover strengths in SF/sub 6/-N/sub 2/ gas mixtures of different proportions. The effect of AC, DC and combined AC/DC voltages on these spacer materials has been discussed. Compatibility of two different materials in terms of flashover behavior is also discussed. Though cycloaliphatic resin spacers show good performance, other spacer materials have distinct advantages in terms of surface tracking, bulk failure, and breakdown under combined and composite AC/DC voltages.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"83 1","pages":"262-265"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77220309","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
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