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Evaluation of streaming electrification considering circulation of charged oil 考虑充注油循环的流电气化评价
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973814
T. Ogura, Y. Shibuya, K. Tsuji
{"title":"Evaluation of streaming electrification considering circulation of charged oil","authors":"T. Ogura, Y. Shibuya, K. Tsuji","doi":"10.1109/ISEIM.2001.973814","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973814","url":null,"abstract":"Streaming electrification occurs when the insulated oil passes through the ducts of insulating paper in a transformer. While the generated electrostatic charge circulates, a high voltage can build up at some parts. In the case that an extremely low conductivity oil is used, the voltage increases because of the large relaxation time. If the relaxation time is comparable to the circulation time of oil, the electrostatic charge accumulates increasing the voltage further. This paper is concerned with the effect of the macroscopic electrostatic charge accumulation. The charge relaxation process is observed experimentally. Based on the relaxation relation, the charge density and voltage rise are evaluated for actual transformers.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"245 1","pages":"860-863"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75054186","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
Study on characteristics of low energy arc discharge 低能电弧放电特性研究
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973792
M. Qinghai, M. Longhua
{"title":"Study on characteristics of low energy arc discharge","authors":"M. Qinghai, M. Longhua","doi":"10.1109/ISEIM.2001.973792","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973792","url":null,"abstract":"Mathematical model of low energy arc discharge was established based on dynamic V-A characteristics of inductive circuits. The dynamic V-A characteristics are regarded as a line whose slope is a function of the inductance values. Analytical expressions of arc current, arc voltage, arc power and arc energy are given. It draws conclusions that arc discharge time is related to circuit time constant and source voltage. The gain of arc discharge energy can be used in assessing intrinsic safety of the circuit.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"174 1","pages":"773-776"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77495549","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
Study on the wave form of leakage current on the 20 kV post-pin ceramic insulators under various conditions 不同工况下20kv后引脚陶瓷绝缘子上漏电流波形的研究
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973682
Suwarno
{"title":"Study on the wave form of leakage current on the 20 kV post-pin ceramic insulators under various conditions","authors":"Suwarno","doi":"10.1109/ISEIM.2001.973682","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973682","url":null,"abstract":"This paper reports the results of investigation on the wave forms of leakage current (LC) on the 20 kV-post-pin ceramics insulators under various conditions. The measurement was conducted by utilizing a computer-based measurement system. analysis of LC harmonics was done by applying fast Fourier transform (FFT). Total harmonic distortion (THD) was used to quantify the harmonics content of the LC. The results show that the magnitude as well as the wave form and THD of the LC were significantly correlated with the condition of the insulator surfaces.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"21 1","pages":"387-390"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81119548","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: 16
Partial discharge localisation on power transformers using neural networks combined with sectional winding transfer functions as knowledge base 结合分段绕组传递函数的神经网络在电力变压器局部放电定位中的应用
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973734
P. Werle, A. Akbari, H. Borsi, E. Gockenbach
{"title":"Partial discharge localisation on power transformers using neural networks combined with sectional winding transfer functions as knowledge base","authors":"P. Werle, A. Akbari, H. Borsi, E. Gockenbach","doi":"10.1109/ISEIM.2001.973734","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973734","url":null,"abstract":"In this paper, the applicability of different neural classifiers trained by sectional winding transfer functions (SWTFs) of transformer coils for evaluating wideband electrical measured partial discharges (PD) is presented and discussed. Based on PD measurements on a distribution transformer in the laboratory, it is demonstrated that the introduced technique enables determination of the apparent charge and adequate localisation of the PD origin. The performance and the reproducibility of this method leads to a short outlook on planned investigations and the possibilities for integrating this technique in online condition monitoring systems.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"61 1","pages":"579-582"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81322816","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: 20
Direct measurement just under surface discharge on PMMA by Pockels electric field sensors 用波克尔斯电场传感器直接测量PMMA表面放电
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973674
T. Takahashi
{"title":"Direct measurement just under surface discharge on PMMA by Pockels electric field sensors","authors":"T. Takahashi","doi":"10.1109/ISEIM.2001.973674","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973674","url":null,"abstract":"Surface discharge is one of the main phenomenons in electric apparatus's fault, but has not yet been cleared. The measurement of electric fields in or near a streamer while surface discharge creeps is greatly helpful for it. There is optical measurement technique for electric fields by using Pockels crystal, and optical waveguide technique has been successfully introduced to miniaturize the sensors. The measurement of electric fields just under surface discharge is tried with the optical waveguide Pockels sensor installed on a PMMA plate and output signals according to its advance are obtained.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"5 1","pages":"363-366"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87793992","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
Surface flashover studies on precompressed pressboard insulation under superimposed AC/DC voltages 交直流叠加电压下预压缩压板绝缘的表面闪络研究
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973817
C. Viswantha, K. Dwarakanath, V.S. Nagakumar
{"title":"Surface flashover studies on precompressed pressboard insulation under superimposed AC/DC voltages","authors":"C. Viswantha, K. Dwarakanath, V.S. Nagakumar","doi":"10.1109/ISEIM.2001.973817","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973817","url":null,"abstract":"The scale down models of pre-compressed mineral oil insulation system have been studied under surface flashover of the surface of insulation. The experimental investigations have been dealt with for conventional AC, DC and superimposed voltages of AC/DC at different electrode gap distances. Two types of models using cylindrical embedded electrodes and stuck electrodes on the surface are employed. The studies relating to different conditions of the insulation system namely dry pressboard, impregnated pressboard in air medium, impregnated pressboard in oil medium are detailed. The surface flashover voltages under AC, DC and superimposed voltages have predominant effect on small electrode gaps causing sufficient damage to the surface of insulation. The time to failure of insulation due to discharges are presented. The discharges are more severe on dry pressboard as compared to oil impregnated pressboard.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"18 1","pages":"872-875"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87180393","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
Multiple surface plasmon excitations and a light emitting device of organic dye LB film 有机染料LB膜的多表面等离子激元激发及发光装置
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973705
T. Nakano, M. Terakado, K. Shinbo, K. Kato, F. Kaneko, T. Wakarnatsu
{"title":"Multiple surface plasmon excitations and a light emitting device of organic dye LB film","authors":"T. Nakano, M. Terakado, K. Shinbo, K. Kato, F. Kaneko, T. Wakarnatsu","doi":"10.1109/ISEIM.2001.973705","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973705","url":null,"abstract":"Emission light was observed for merocyanine (MC) LB films and hetero films of MC and crystal violet (CV) LB films on silver (Ag) films using the reverse irradiation in the Kretschmann configuration. Emission properties and changes in the spectra due to energy interaction of MC and CV molecules have been investigated using the Ag thin film conventional ATR method and the reverse irradiation. The phenomenon is useful for application to a new luminescent devices and sensors.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"52 1","pages":"471-474"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87003711","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
Fault location of transformer winding deformation using frequency response analysis 基于频响分析的变压器绕组变形故障定位
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973809
Jin Zhijian, Zhu Minglin, Zhu Zishu
{"title":"Fault location of transformer winding deformation using frequency response analysis","authors":"Jin Zhijian, Zhu Minglin, Zhu Zishu","doi":"10.1109/ISEIM.2001.973809","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973809","url":null,"abstract":"FRA (frequency response analysis) is the best effective method that can successfully detect transformer winding deformation. This paper tries to diagnose the fault by the winding's physical parameter changes. At frequencies lower than critical frequency, the transformer winding may be modeled as a lossless transmission line that the series capacitance could be easily neglected. The parameters of inductance and grounding capacitance may be determined respectively. Any change in these parameters then should reflect the probable position of transformer winding deformation.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"1 1","pages":"841-844"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89813107","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: 17
Partial discharge monitoring system with use of resistance temperature detector laid in stator coil slot of hydro power generator 安装在水轮发电机定子线圈槽内的电阻温度检测器局部放电监测系统
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973760
M. Kanegami, T. Okamoto, T. Noda, K. Hashimoto, K. Takimoto, S. Kondoh
{"title":"Partial discharge monitoring system with use of resistance temperature detector laid in stator coil slot of hydro power generator","authors":"M. Kanegami, T. Okamoto, T. Noda, K. Hashimoto, K. Takimoto, S. Kondoh","doi":"10.1109/ISEIM.2001.973760","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973760","url":null,"abstract":"It is necessary to estimate precisely the breakdown strength of coil insulation if utilities intend to continue using stator coils which have been used for a long time. For this purpose, monitoring of the maximum discharge magnitude (qm) of partial discharges (PDs) in coil insulation has been found to be useful. A monitoring method has been developed using the resistance temperature detector (RTD) laid in the stator coil slot of a hydro power generator as a PD current pulse detector. For the purpose of deciding diagnosis criteria based on the PD monitoring, long term PD characteristics should be clarified. We set monitoring systems in 4 hydro power stations. Over a period of one year, we have monitored several combinations of PD, line voltage, coil temperature and output current every hour. We analyzed these data and found strong correlation between qm and coil temperature.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"1 1","pages":"657-660"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90258671","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
The characteristics of holographic grating in chalcogenide thin films 硫系薄膜全息光栅的特性
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973589
Jeong-Il Park, Jong-Hwa Park, K. Shin, Jin-Woo Kim, Young-Jong Lee, H. Chung
{"title":"The characteristics of holographic grating in chalcogenide thin films","authors":"Jeong-Il Park, Jong-Hwa Park, K. Shin, Jin-Woo Kim, Young-Jong Lee, H. Chung","doi":"10.1109/ISEIM.2001.973589","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973589","url":null,"abstract":"We have investigated the polarization dependence of holographic gratings in chalcogenide Se/sub 75/Ge/sub 25/ and As/sub 40/Ge/sub 10/Se/sub 15/S/sub 35/ thin films. The films have been irradiated using a linearly polarized He-Ne laser at 633 nm. To observe the etching characteristic, the films have been etched with NaOH solution. Film thicknesses were about 1 /spl mu/m and 3 /spl mu/m, and were monitored with a quartz oscillator during deposition and measured with the NKT1200 analyzer. A self-relief grating was formed in As/sub 40/Ge/sub 10/Se/sub 15/S/sub 35/ thin film.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"40 1","pages":"145-147"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90359618","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
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