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Investigation on characteristics of corona current to single insulator 对单个绝缘子电晕电流特性的研究
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973648
Liu Chun, Wen Yuan-fang, Nie Yi-xiong, Mao Munong, Deng Guofu, L. Kecheng
{"title":"Investigation on characteristics of corona current to single insulator","authors":"Liu Chun, Wen Yuan-fang, Nie Yi-xiong, Mao Munong, Deng Guofu, L. Kecheng","doi":"10.1109/ISEIM.2001.973648","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973648","url":null,"abstract":"In this paper, the characteristics of corona current of a single insulator under high voltage is studied in different methods. The results show that the characteristics of corona current are different with their status. From these characteristics, an insulator's status can be decided online.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"89 1","pages":"286-289"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86449620","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
The structural properties of BaTiO/sub 3/+xNb/sub 2/O/sub 5/ ceramics BaTiO/sub 3/+xNb/sub 2/O/sub 5/陶瓷的结构性能
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973575
Sang Chul Lee, Moon-Kee Lee, Young Hie Lee
{"title":"The structural properties of BaTiO/sub 3/+xNb/sub 2/O/sub 5/ ceramics","authors":"Sang Chul Lee, Moon-Kee Lee, Young Hie Lee","doi":"10.1109/ISEIM.2001.973575","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973575","url":null,"abstract":"The BaTiO/sub 3/+xNb/sub 2/O/sub 5/ [x=6, 8, 10 wt%] ceramics were prepared by conventional mixed oxide method. The structural properties of the BaTiO/sub 3/+xNb/sub 2/O5 ceramics with the sintering temperature and addition of Nb/sub 2/O/sub 5/ were investigated by XRD and SEM. Increasing the sintering temperature, the 2/spl otimes/ value of BT [110] peak was shifted to the lower degree and intensity of the BN [310] peak was increased. Increasing the addition of Nb/sub 2/O/sub 5/, the intensity of BN [100] peak was decreased and BN [310], [110] peaks were increased. The grain size of the BaTiO/sub 3/+Nb/sub 2/O/sub 5/ ceramics sintered at 1500/spl deg/C were almost uniform. In the BaTiO/sub 3/+10wt%Nb/sub 2/O/sub 5/ ceramics sintered at 1450/spl deg/C, the density was 31.97 [g/cm/sup 3/].","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"62 1","pages":"103-106"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86085628","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
Effects of tropical climate on the performance of RTV silicone rubber with various filler contents 热带气候对不同填料含量RTV硅橡胶性能的影响
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973662
Suwarno, Salama, K. T. Sirait
{"title":"Effects of tropical climate on the performance of RTV silicone rubber with various filler contents","authors":"Suwarno, Salama, K. T. Sirait","doi":"10.1109/ISEIM.2001.973662","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973662","url":null,"abstract":"Room temperature vulcanization (RTV) silicone rubber is one of the new materials for outdoor insulators especially for high-contaminated areas. Before applying the material in a tropical region like Indonesia it is important to investigate the effects of the tropical climate on the properties of the materials. We have investigated the aging of RTV silicone rubber with various filler contents in Bandung for 120 weeks. There were two groups of samples. The first group was directly exposed to weather while the other one was laid under a shielding which prevented direct exposure of UV radiation, pollution and rain. During the aging we measured the hydrophobicity (contact angle), permittivity, tan /spl delta/, and loss of weight. The investigation results indicated that samples exposed to outside climate directly showed better hydrophobicity, but greater changes of permittivity, tan /spl delta/ and weight were observed. Water absorption played an important role in the change of permittivity and tan /spl delta/. The removal of water by drying was able to restore the permittivity and tan /spl delta/ almost to the original values. RTV with higher filler content showed higher ability to resist the surface degradation. Analysis of the residual weight may be used to calculate expected lifetime of the material in service under tropical condition.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"53 1","pages":"328-331"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83287169","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
Estimation of temperature increase in polymer film under DC voltage with PEA 用PEA估计直流电压下聚合物薄膜的温升
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973690
C. Zhang, T. Mizutani, K. Kaneko, M. Ishioka
{"title":"Estimation of temperature increase in polymer film under DC voltage with PEA","authors":"C. Zhang, T. Mizutani, K. Kaneko, M. Ishioka","doi":"10.1109/ISEIM.2001.973690","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973690","url":null,"abstract":"The authors develop a method to measure the temperature in a LDPE dielectric film during the application of high DC voltage by measuring the sound velocity with pulsed electroacoustic method (PEA).","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"7 1","pages":"411-414"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83437029","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
Frequency characteristics of PD waveforms on polluted composite insulator surfaces 污染复合绝缘子表面PD波形的频率特性
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973683
I. Giriantari, T. Blackburn
{"title":"Frequency characteristics of PD waveforms on polluted composite insulator surfaces","authors":"I. Giriantari, T. Blackburn","doi":"10.1109/ISEIM.2001.973683","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973683","url":null,"abstract":"Investigations of partial discharge characteristics of the surface leakage on polluted composite polymer insulators (SiR and EPDM) have been performed. This work is part of a program aimed at examining the potential for PD characteristics analysis to provide information about the condition of composite polymer insulators. The investigation reported examined the PD waveform characteristics at high frequencies. The use of high frequency measurements for on-line applications reduces electrical interference. This work was performed utilizing high frequency CTs to monitor PDs. It was found that there were significant variations in the PD waveform frequency spectrum, depending both on the PD magnitude and more importantly on the duration of the PD activity.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"129 1","pages":"391-394"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88632633","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
An on-line insulation monitoring system based on fieldbus 基于现场总线的绝缘在线监测系统
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973791
Yimei Jia, Fuheng Su, J. Liu
{"title":"An on-line insulation monitoring system based on fieldbus","authors":"Yimei Jia, Fuheng Su, J. Liu","doi":"10.1109/ISEIM.2001.973791","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973791","url":null,"abstract":"This paper points out the main problems of an on-line insulation monitoring system at present. A new on-line insulation monitoring system for HV apparatus is presented in this paper, which consists of the lower intelligent monitoring units in substation field and the upper personal computers for the aim of control and information management. A kind of technology using LonWorks fieldbus is adopted in this monitoring system. Some fundamental equipment of this system is also specially described, including sensor, intelligent monitoring unit and fieldbus.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"81 1","pages":"769-772"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88774232","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 the development of PD parameters during the process of multi-stress aging of stator winding 定子绕组多应力老化过程中局部放电参数变化的研究
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973779
Yue Bo, Li Jian, Xiaohong Zhang, Hengkun Xie
{"title":"Study on the development of PD parameters during the process of multi-stress aging of stator winding","authors":"Yue Bo, Li Jian, Xiaohong Zhang, Hengkun Xie","doi":"10.1109/ISEIM.2001.973779","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973779","url":null,"abstract":"The PD detection technology has been an efficient method to evaluate the condition of solid insulation since its occurrence and is now used widely in the field of electric engineering. In this paper, the development of PD parameters during the process of multi-stress aging of stator winding is studied in order to evaluate the condition of solid insulation of a large generator in service by PD detection technology. The thermal, electrical and mechanical stresses were applied to the specimens of stator bar by the aging system simultaneously. Moreover, a practical anti-corona scheme is adopted to improve the electrical field distribution at the end of specimen and a new measuring electrode system is used to assure the accuracy of PD measurement and the feasibility of long-term multistress aging. The partial discharge is measured before multi-stress aging and after 600 h aging by using HAEFELY TE571 partial discharge analyzer. The PD phase-resolved quantities distribution, time-resolved quantities distribution and three-dimensional distribution were analyzed in this paper. The maximum magnitude, number, energy, current of discharge increase and the center discharge moves to the negative half of the voltage cycle from the positive half according to the discharge three-dimensional distribution. In addition, the phase range of discharge widens apparently.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"37 1","pages":"721-724"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87437097","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
Measurement of transient electric fields and analysis based on wavelet 基于小波变换的瞬态电场测量与分析
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973627
Qingquan Li, Yanming Li, Dake Xu, J. Cao
{"title":"Measurement of transient electric fields and analysis based on wavelet","authors":"Qingquan Li, Yanming Li, Dake Xu, J. Cao","doi":"10.1109/ISEIM.2001.973627","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973627","url":null,"abstract":"Electromagnetic interference is a major concern in modern power systems as increasing control is being performed by highly susceptible electronic circuitry. It is therefore necessary to characterize this interference. This paper introduces a measurement system based on spherical sensor and optical insulation system, and using this system to measure the transient fields of impulse in laboratory. The wavelet transform is well suited to wide-band signals, such as the typical electromagnetic transient in power system. And the ability of wavelet to focus on short time intervals for high frequency components and long intervals for low frequency components improves the analysis of signals with impulses and oscillations. The basic principles of wavelet analysis are set forth, and examples using the property of multiresolution to de-noise and reconstruct the signal.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"44 1","pages":"233-236"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73567902","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
Voltage-time characteristics of PD patterns in void discharges 空穴放电中PD模式的电压-时间特性
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973548
S.H. Kang, Y.G. Park, C. Lee, J.N. Park, K.J. Lim
{"title":"Voltage-time characteristics of PD patterns in void discharges","authors":"S.H. Kang, Y.G. Park, C. Lee, J.N. Park, K.J. Lim","doi":"10.1109/ISEIM.2001.973548","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973548","url":null,"abstract":"PD in defects of solid insulation system is very harmful since it leads to deterioration of insulation. But, PD can indicate incipient failure, so it has been used to determine degradation of insulation. Void is usual defect in solid insulation system. Void is very harmful since it leads to deterioration of insulation. So it is very important that study properties of PD in void. To estimate deterioration of void, accurate and general characteristics of PD in void are required. The correlation between size of void and internal partial discharge (PD) was discussed as a function of time of the applied voltage and its magnitude. Magnitude, repetition rate, average discharge power and Average discharge current of PD in specimens with large void were larger than the other. The smaller specimens had void, the faster magnitude and the number of PD were reduced.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"104 1","pages":"25-28"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72919842","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
Heterojunction photovoltaic cell using p- and n-type conducting polymers 采用p型和n型导电聚合物的异质结光伏电池
装备机械 Pub Date : 2001-11-19 DOI: 10.1109/ISEIM.2001.973739
M. Onoda, K. Tada
{"title":"Heterojunction photovoltaic cell using p- and n-type conducting polymers","authors":"M. Onoda, K. Tada","doi":"10.1109/ISEIM.2001.973739","DOIUrl":"https://doi.org/10.1109/ISEIM.2001.973739","url":null,"abstract":"A poly(p-pyridyl vinylene), PPyV/Poly(3-hexylthiophene), P3HT heterojunction photovoltaic cell was fabricated and its photo irradiation effects have been investigated. Quenching of photoluminescence both in the PPyV and P3HT layers has been observed in the PPy/P3HT heterojunction film. The photovoltaic characteristics of the heterojunction photovoltaic cell are also greatly improved from those in a P3HT monolayer photovoltaic cell. Its photoresponse gives evidence of the photoinduced charge transfer between PPyV and P3HT. These results are discussed by taking account of the difference in electronic states of both PPyV and P3HT.","PeriodicalId":71964,"journal":{"name":"装备机械","volume":"876 1","pages":"595-598"},"PeriodicalIF":0.0,"publicationDate":"2001-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72664482","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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