2018 Condition Monitoring and Diagnosis (CMD)最新文献_第10页

Power Equipment Diagnosis & preventive System for GIS and Transformer GIS与变压器电力设备诊断与预防系统

2018 Condition Monitoring and Diagnosis (CMD) Pub Date : 2018-09-01 DOI: 10.1109/CMD.2018.8535860

G. Kang

引用次数: 1

Effect of Contaminant on Breakdown Characteristics of Mineral Oil and Palm Oil 污染物对矿物油和棕榈油分解特性的影响

2018 Condition Monitoring and Diagnosis (CMD) Pub Date : 2018-09-01 DOI: 10.1109/CMD.2018.8535901

S. Maneerot, N. Pattanadech

{"title":"Effect of Contaminant on Breakdown Characteristics of Mineral Oil and Palm Oil","authors":"S. Maneerot, N. Pattanadech","doi":"10.1109/CMD.2018.8535901","DOIUrl":"https://doi.org/10.1109/CMD.2018.8535901","url":null,"abstract":"This paper details an investigation of the effect of contaminant particles at several different temperatures on the 50 Hz AC breakdown voltage of two dielectric liquids - mineral oil and palm oil. The liquids in the test cell used were comprised of various combinations of the following: a) three particle types (cellulose, spherical iron and copper) of approximately 20 μm diameter, b) three contaminant concentrations i.e.0.001% m/V, 0.003% m/V and 0.005% m/V, and c) four liquid temperatures i.e. 25°C, 50°C, 70°C, and 90°C. were investigated with mushroom shaped electrodes in accordance with IEC 60156. The results obtained in this test process showed that the presence of the added particles in the tested dielectric liquids consistently provided a reduction in breakdown voltage, and that the reduction factor varied according to particle type, particle concentration, liquid type, and liquid temperature, and on whether they consisted of cellulose insulation material or copper and iron conducting material summarizing the test results, it was shown that higher contaminant concentration produced lower breakdown voltages, that the addition of copper particles had the most significant effect on reducing breakdown strength, and that the greatest reduction of breakdown strength was measured in the contaminated mineral oil test samples at a test temperature of 70°C.","PeriodicalId":6529,"journal":{"name":"2018 Condition Monitoring and Diagnosis (CMD)","volume":"20 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78677793","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

Determination of Hot-Spot Temperature for ONAN Distribution Transformers with Dynamic Thermal Modelling 基于动态热模型的ONAN配电变压器热点温度确定

2018 Condition Monitoring and Diagnosis (CMD) Pub Date : 2018-09-01 DOI: 10.1109/CMD.2018.8535752

Oluş Sönmez, G. Komurgoz

{"title":"Determination of Hot-Spot Temperature for ONAN Distribution Transformers with Dynamic Thermal Modelling","authors":"Oluş Sönmez, G. Komurgoz","doi":"10.1109/CMD.2018.8535752","DOIUrl":"https://doi.org/10.1109/CMD.2018.8535752","url":null,"abstract":"High temperature rise problem, one of the most serious problems for transformers. Loading cycles and ambient conditions of transformers can be different than design conditions. Transformer top-oil temperature and winding hot spot temperatures are most critical parameters for transformer because it causes aging and therefore affects life time of transformer. It is very important to determine hot-spot temperature and oil temperature accurately which depends on ambient conditions and loading conditions to avoid loss of life on transformer. IEEE C57.91-2011 and IEC 60076–7 standards present thermal models for defining critical temperatures in transformers. These models are widely used in industry. On the other hand these methods are solved with exponential equations and they do not take into account the effects of change on oil temperature. Dynamic thermal model which is proposed by D. Susa, requires similar input parameters with IEEE C57.91-2011 model and IEC 60076–7 model, in addition to this, this thermal model takes into account the effects of change on oil temperature. Scope of this study will be to verify three different temperature rise models for distribution transformers to allow optimum loading of natural oil cooled transformers by using the data which could be obtained from manufacturer. In this study, on a 1000 kVA 33/0.4 kV ONAN cooled distribution transformer, two temperature rise tests will be realized. Significant advantage of this study will be, necessary parameters for all thermal models will be determined with proper measurements of tested unit, therefore all three models will be compared under same conditions.","PeriodicalId":6529,"journal":{"name":"2018 Condition Monitoring and Diagnosis (CMD)","volume":"1 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76370228","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: 6

EMD- WVD Method Based High- Frequency Current Analysis of Low Voltage Arc 基于EMD- WVD方法的低压电弧高频电流分析

2018 Condition Monitoring and Diagnosis (CMD) Pub Date : 2018-09-01 DOI: 10.1109/CMD.2018.8535969

Jiangting Liu, Kaifeng Zhou, Yue Hu

引用次数: 7

Effects of Different Load on Temperature and Electric Field Distribution of Flexible DC Cable Terminal 不同负载对柔性直流电缆端子温度和电场分布的影响

2018 Condition Monitoring and Diagnosis (CMD) Pub Date : 2018-09-01 DOI: 10.1109/CMD.2018.8535781

Longxiao Chen, Li-Ming Yang, Zhien Zhu, Xike Wu

{"title":"Effects of Different Load on Temperature and Electric Field Distribution of Flexible DC Cable Terminal","authors":"Longxiao Chen, Li-Ming Yang, Zhien Zhu, Xike Wu","doi":"10.1109/CMD.2018.8535781","DOIUrl":"https://doi.org/10.1109/CMD.2018.8535781","url":null,"abstract":"Flexible DC cable is the most important carrier of flexible DC transmission, while the flexible DC cable terminal is the weakest part of the whole cable system. When the load applied in the flexible DC cable system is different, the stable operation temperature of flexible DC cable conductor will be different, each part of the terminal insulating material temperature changes, which makes the conductivity changes. Therefore, the electric field distribution of the DC cable terminal also presents difference with the change of load. Due to the conductivity is a function of changing with temperature and electric field, using analytic method to solve the electric field distribution in terminal insulating layer is very difficult. This paper has compared the calculation results of analytical method and finite element method by calculating DC cable. The results show the consistency of analytical method and finite element method. Through the research on the temperature field and the electric field distribution of flexible DC cable terminal insulation, fully grasp the law of the electric field distribution of terminal insulation layer, provide the research foundation of flexible DC cable terminal structure design and optimization, and also provide technical support for China's ± 535kV and ± 800kV UHVDC transmission project.","PeriodicalId":6529,"journal":{"name":"2018 Condition Monitoring and Diagnosis (CMD)","volume":"5 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82190174","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

Diagnosis of Transformer Winding Looseness Based on Vibration Sensor Array 基于振动传感器阵列的变压器绕组松动诊断

2018 Condition Monitoring and Diagnosis (CMD) Pub Date : 2018-09-01 DOI: 10.1109/CMD.2018.8535884

Yuhang Shi, Wefgel Lu, Fan Zhang, Y. Dang, C. Zhan, S. Ji, Ziqian Zhu

{"title":"Diagnosis of Transformer Winding Looseness Based on Vibration Sensor Array","authors":"Yuhang Shi, Wefgel Lu, Fan Zhang, Y. Dang, C. Zhan, S. Ji, Ziqian Zhu","doi":"10.1109/CMD.2018.8535884","DOIUrl":"https://doi.org/10.1109/CMD.2018.8535884","url":null,"abstract":"The vibration of the oil-tank can reflect the mechanical condition of transformer internal windings and cores. Although there were several studies about the vibration of the transformer, most of them do not take into account the inherent connection between different measuring points, which results in insufficient utilization of vibration information. To conquer this shortcoming, a fault diagnosis method for transformer winding looseness based on vibration sensor array is proposed. An array measurement system was set up, and a suitable measurement method was put forward. Because the voltage fluctuation of the transformer in actual operation is very small while the load current fluctuates greatly and the winding vibration is mainly influenced by the current. Load tests were conducted on a single-phase transformer. The influence of the current on the vibration characteristics was studied. Different levels of winding looseness were set up and their vibration characteristics were studied. The matrix distance was used to judge the deviation of the array signal. The results show that the array signal does not change with the current change. When the windings are loosened, the array distance of the array signal increases significantly. It provides a new idea for the diagnosis of the mechanical fault of transformer windings based on vibration signals.","PeriodicalId":6529,"journal":{"name":"2018 Condition Monitoring and Diagnosis (CMD)","volume":"65 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82383859","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

Design and Fabrication of 3-D Cube UHF Antenna for Partial Discharge Detection 用于局部放电检测的三维立方体超高频天线的设计与制作

2018 Condition Monitoring and Diagnosis (CMD) Pub Date : 2018-09-01 DOI: 10.1109/CMD.2018.8535817

Akhmad Fauzan, U. Khayam, Suwarno, M. Kozako, M. Hikita

{"title":"Design and Fabrication of 3-D Cube UHF Antenna for Partial Discharge Detection","authors":"Akhmad Fauzan, U. Khayam, Suwarno, M. Kozako, M. Hikita","doi":"10.1109/CMD.2018.8535817","DOIUrl":"https://doi.org/10.1109/CMD.2018.8535817","url":null,"abstract":"Partial discharge (PD) is one of electrical phenomena which might occur in high voltage (HV) equipment and can be used for diagnosing the condition of equipment. PD emits electromagnetic wave that can be detected by antenna device. Many types of ultra-high frequency (UHF) antenna have been developed to achieve a better sensitivity and accuracy in certain bandwidth (300 MHz–3.0 GHz) for detecting the UHF component generated by PD. This paper presents a new concept design of a small, easy to fabricate, 3-D cube antenna made of copper sheet as main material. Three antenna prototypes are proposed which operate at three different dominant frequencies, 1.46GHz, 2.26GHz and 2.82GHz. Each antenna prototype was designed with a three-dimension finite difference time domain (FDTD) simulation software (CTC Co.; MAGNA TDM version 8.3). Measurements of frequency dependence of return loss of thus designed antenna prototype were made with a vector network analyzer (VNA). PD measurement in electrode system including artificial PD source was also conducted to evaluate the performance of the developed antennas. In consideration of high frequency PD component, the experiment was using artificial PD object; needle-plane electrode 2mm gap and rod-plane electrode 0.2mm gap with 1m distance from the antenna prototype. Electromagnetic wave (EM) intensity and frequency captured by the antenna prototype then compared. It was found that the antenna prototype detected average PD magnitude value ranged in the order of 1500pC for the object PD source. Measurement of antenna prototype directivity is also examined and obtained a good agreement with the simulation result.","PeriodicalId":6529,"journal":{"name":"2018 Condition Monitoring and Diagnosis (CMD)","volume":"19 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82941313","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

Dielectric Properties of Resin Rich Stator Coil of High Voltage Motor during Processing 高压电机富树脂定子线圈在加工过程中的介电性能

2018 Condition Monitoring and Diagnosis (CMD) Pub Date : 2018-09-01 DOI: 10.1109/CMD.2018.8535788

S. Boonsathitthavorn, N. Phumipunepon, P. Kitcharoen, N. Pattanadech

{"title":"Dielectric Properties of Resin Rich Stator Coil of High Voltage Motor during Processing","authors":"S. Boonsathitthavorn, N. Phumipunepon, P. Kitcharoen, N. Pattanadech","doi":"10.1109/CMD.2018.8535788","DOIUrl":"https://doi.org/10.1109/CMD.2018.8535788","url":null,"abstract":"One of the non-destructive test methods commonly used to characterize the electrical properties of power equipment is polarization and depolarization current testing. The objective of this paper is to study of the change of dielectric properties during the manufacturing stages of a stator coil used in 6.6 kV 260 kW motor. There were five steps to manufacture the resin rich stator coil. The first step, the copper coil was wound around by NOMEX paper. Then the slot portion of the stator coil was wound by KREMICAL tape as the second process and by the conductive tape as the third process. Then, the insulation and conductive layer of the stator coil were pressed and cured at 160°C for one and a half hour as the fourth process. The pressing and curing will combine the multi insulation to be homogeneous insulation of the stator coil. The final step, the end winding portion was wounded by Filosam tape and polyester tape. The polarization and depolarization currents were measured and recorded after finishing each manufacturing process. From the test results, the polarization currents and depolarization currents obtained from each step were clearly different. Then the polarization and depolarization currents, conduction current and capacitance of the test results were analyzed and reported in this paper.","PeriodicalId":6529,"journal":{"name":"2018 Condition Monitoring and Diagnosis (CMD)","volume":"90 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89960378","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

Condition monitoring technology of transformer with multiple sensing methods united 多种传感方法相结合的变压器状态监测技术

2018 Condition Monitoring and Diagnosis (CMD) Pub Date : 2018-09-01 DOI: 10.1109/CMD.2018.8535921

Liang He, X. Zhang, Jiangrong Cheng, Xing Li, Dengwei Ding, Weidong Liu

引用次数: 1

Partial Discharge Source Classification for Switchgears with Transient Earth Voltage Sensor Using Convolutional Neural Network 基于卷积神经网络的瞬态接地电压传感器开关设备局部放电源分类

2018 Condition Monitoring and Diagnosis (CMD) Pub Date : 2018-09-01 DOI: 10.1109/CMD.2018.8535913

Kozo Banno, Yusuke Nakamura, Yuuki Fujii, Toshiya Takano

引用次数: 17