2019 IEEE Electrical Insulation Conference (EIC)最新文献_第10页

Influence of Oil Duct Variation on Thermal Characteristics of Converter Transformer Winding 油路变化对换流变压器绕组热特性的影响

2019 IEEE Electrical Insulation Conference (EIC) Pub Date : 2019-06-01 DOI: 10.1109/EIC43217.2019.9046607

Cong Liu, J. Hao, Runhao Zou, Zhiwei Li

引用次数: 0

Noise rejection and partial discharge identification in PDIV tests of insulated wires under repetitive impulse supply voltage 重复冲击供电电压下绝缘导线PDIV试验的噪声抑制和局部放电识别

2019 IEEE Electrical Insulation Conference (EIC) Pub Date : 2019-06-01 DOI: 10.1109/EIC43217.2019.9046587

G. Montanari, R. Hebner, P. Seri, R. Ghosh

{"title":"Noise rejection and partial discharge identification in PDIV tests of insulated wires under repetitive impulse supply voltage","authors":"G. Montanari, R. Hebner, P. Seri, R. Ghosh","doi":"10.1109/EIC43217.2019.9046587","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046587","url":null,"abstract":"Partial discharge (PD) detection is a fundamental test for the design and diagnosis of insulation systems, particularly organic materials which must operate throughout their whole life without PD. The measurement of Partial Discharge Inception Voltage (PDIV) and Repetitive Partial Discharge Inception Voltage (RPDIV), the latter defined for power electronic-type supply, is therefore a key issue for the design and qualification tests of Type I insulation system of rotating machines fed by power converters. While experience and technology for PD inception measurements under sinusoidal voltage supply is well established, the same does not hold under repetitive-pulse voltage waveforms, such as those provided by inverters. In addition, electromagnetic noise generated by electronic switch commutation can overlap with PD pulses signals and this is even more cumbersome when fast rise-time components are employed, such as GaN or SiC semiconductors. Moreover, this is also the condition which is the most stressful for stator wire insulation. This work investigates methods to detect PD pulses on enameled wires, rejecting noise efficiently, under repetitive impulsive voltages with different rise times, from 60 ns to 1000 ns. The proposed techniques can be implemented to achieve un-supervised noise rejection, which would be an important goal for both off-line and on-line PD testing.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125845869","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: 7

Unidirectional Accelerated Lifetime Investigations of Mechanically Dominated Aged Electrical Insulation System used in Generator Winding Bars 发电机绕组条用机械主导老化电绝缘系统单向加速寿命研究

2019 IEEE Electrical Insulation Conference (EIC) Pub Date : 2019-06-01 DOI: 10.1109/EIC43217.2019.9046626

A. Cimino, F. Jenau, A. Mashkin, D. Behnisch, R. Merte, H. Steins, F. Pohlmann

引用次数: 0

The RPDIV and the limits of its definition according to IEC 60034-18-41: the effect of voltage conditioning RPDIV及其根据IEC 60034-18-41定义的限值:电压调节的影响

2019 IEEE Electrical Insulation Conference (EIC) Pub Date : 2019-06-01 DOI: 10.1109/EIC43217.2019.9046551

A. Caprara, G. Ciotti, A. Cavallini, A. Rumi

引用次数: 3

About the relevance of using Paschen's criterion for partial discharges inception voltage (PDIV) estimation when designing the electrical insulation system of inverter fed motors 讨论了用Paschen准则估计局部放电起始电压(PDIV)在逆变电机绝缘系统设计中的意义

2019 IEEE Electrical Insulation Conference (EIC) Pub Date : 2019-06-01 DOI: 10.1109/EIC43217.2019.9046558

P. Collin, D. Malec, Y. Lefèvre

{"title":"About the relevance of using Paschen's criterion for partial discharges inception voltage (PDIV) estimation when designing the electrical insulation system of inverter fed motors","authors":"P. Collin, D. Malec, Y. Lefèvre","doi":"10.1109/EIC43217.2019.9046558","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046558","url":null,"abstract":"In the literature, the Paschen's criterion is widely used to determine partial discharges (PD) inception in the electrical insulation systems (EIS) of machines. This criterion has been established for 2 metallic plane electrodes facing each other in a uniform electric field. The objective of this communication is to determine whether Paschen's criterion may still be used in a configuration of enameled round wires in non-uniform field. For that purpose, PD risk between 2 parallel enameled round wires at atmospheric pressure has been studied, from both measurements and simulation points of view. Different experiments with different samples geometry, fully measured by a digital microscope, has been compared to simulation using Paschen's criterion. This work aims to bring out a more complete criterion on PD detection, in the case of enameled round wires, in order to use it as a reference in a software under development. This software will help designers to take into account the PD phenomena in the design stage of the EIS of a low voltage rotating machine fed by an inverter.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129902286","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

Evaluation of Natural Ester Retrofilled Transformers After One Year of Continuous Overload 天然酯填充变压器连续超负荷一年后的评价

2019 IEEE Electrical Insulation Conference (EIC) Pub Date : 2019-06-01 DOI: 10.1109/EIC43217.2019.9046617

Robert C. Breazeal, A. Sbravati, D. Robalino

{"title":"Evaluation of Natural Ester Retrofilled Transformers After One Year of Continuous Overload","authors":"Robert C. Breazeal, A. Sbravati, D. Robalino","doi":"10.1109/EIC43217.2019.9046617","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046617","url":null,"abstract":"Despite the efforts of the utilities to designate properly sized transformers for the distribution network, transformers are routinely subjected to significant overloads during peak hours. This is especially common during hot summer days where the hot spot temperature value may exceed the design limits. With the utilization of natural ester liquid in distribution transformers, the rate of paper degradation is expected to be reduced in comparison to a traditional mineral oil unit at same conditions. The acceptable top oil temperature for natural ester is significantly higher than that for mineral oil. The improvements for both solid and liquid insulation enhance the ability to subject the distribution transformer to overload conditions. An experimental protocol was performed in 2017 to further investigate these properties of natural ester oil. In this document, the research work performed by Southern California Edison (SCE) is summarized and described in detail. For a period of one year, 11 transformers were subjected to thermal overload and thus, to an accelerated aging process. Transformers were loaded for cycles of 4 weeks, up to 145% of nameplate rating. After each loading cycle the transformers were cooled down to ambient temperature and tested using dielectric frequency response to document and trend the changes in the dielectric conditions of the complex insulation system. Challenges, lessons learned and recommendations are discussed herein.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133104421","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: 7

Improvements in the Identification of Defects on the Semiconducting Slot Coating of Stator Bars Using Partial Discharges 局部放电在定子棒半导体槽镀层缺陷识别中的改进

2019 IEEE Electrical Insulation Conference (EIC) Pub Date : 2019-06-01 DOI: 10.1109/EIC43217.2019.9046517

F. Pereira, H. Tatizawa, M. Zanotti

{"title":"Improvements in the Identification of Defects on the Semiconducting Slot Coating of Stator Bars Using Partial Discharges","authors":"F. Pereira, H. Tatizawa, M. Zanotti","doi":"10.1109/EIC43217.2019.9046517","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046517","url":null,"abstract":"The present work describes how the detection of surface defects located in the slot portion of high-voltage bars (or coils) can be improved with the use of partial discharge (PD) tests. In spite of all care, surface defects capable of damaging the semiconducting slot coating of bars can eventually be created during their manufacturing process or later on, during their installation at site. Although the most commonly used methods to search for surface defects are based upon visual inspections, this work will explore a possible improvement in such methodologies by using electrical methods, such as the acquisition and discrimination of PD pulses. The results shown here represent a first progress report of a larger ongoing project that aims to develop a test method suitable for the quality control of bars and coils mass production. To address the topic in laboratory scale, a series of artificially created defects were produced and systematically tested with different parameters. A number of test conditions was employed to determine under which circumstances the test can be sensitive enough to permit a clear detection and discrimination of the surface damages. It was found that although the mere recording of PD amplitudes is a simpler and straightforward method of detection, it is the analysis of the complete PD patterns that provides the most useful information to identify the defects.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132930123","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 Space Charge Distribution Characteristics in the Actual HVDC Cable 实际高压直流电缆中空间电荷分布特性的测量

2019 IEEE Electrical Insulation Conference (EIC) Pub Date : 2019-06-01 DOI: 10.1109/EIC43217.2019.9046589

Yifan Zhou, Wei Wang, T. Guo, Jiale Qi

{"title":"Measurement of Space Charge Distribution Characteristics in the Actual HVDC Cable","authors":"Yifan Zhou, Wei Wang, T. Guo, Jiale Qi","doi":"10.1109/EIC43217.2019.9046589","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046589","url":null,"abstract":"The accumulation effect of space charge in high voltage direct current (HVDC) cable may lead to the distortion of internal electric field, accelerate insulation aging and even cause insulation breakdown, which seriously affected the reliability of operation of HVDC cable. With the operation of HVDC cable, the radial distribution of temperature gradient is developed within the insulation material among the temperature presented high on internal layer and low on external layer. However, as the existence of non-linear phase distortion of the measurement system, cylindrical geometric structure for HVDC cable and temperature gradient, the measured waveforms of space charge in HVDC cable based on pulsed electro-acoustic (PEA) method induces distortion. In this paper, the temperature at cable core is set at 30°C, 60°C and 90°C respectively in order to form different temperature gradients, the negative DC electric Field of 10 kV/mm is applied to HVDC cable, space charge distribution characteristics are researched based on the space charge measurement system using PEA method for HVDC cable, the measured waveforms developed by our laboratory can be corrected by modified recovery algorithms. It is concluded that with the increase of temperature at cable core, heterocharges gradually accumulate near the lower temperature side of HVDC cable. The higher temperature at cable core can also promote the injection of homocharges in HVDC cable. The temperature gradient in HVDC cable has importance impact on space charge accumulation, the research on space charge distribution characteristics can provide basis for further study on space charge behavior mechanism under temperature gradient.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134025244","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

Development of High Thermal Conductivity Epoxy Composite for Large Current Switchgear 大电流开关柜用高导热环氧复合材料的研制

2019 IEEE Electrical Insulation Conference (EIC) Pub Date : 2019-06-01 DOI: 10.1109/EIC43217.2019.9046519

G. Komiya, T. Imai, Y. Miyauchi

{"title":"Development of High Thermal Conductivity Epoxy Composite for Large Current Switchgear","authors":"G. Komiya, T. Imai, Y. Miyauchi","doi":"10.1109/EIC43217.2019.9046519","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046519","url":null,"abstract":"Since SF6 gas used as an insulating medium for switchgear is a greenhouse gas, its use needs to be reduced. Toshiba Corporation has developed solid insulated switchgear (SIS) in which the main circuit is molded with an epoxy composite. Since developing the 24 kV class SIS in 2002, a 72/84 kV class SIS has been launched. The high dielectric strength of the epoxy composites enables these solid insulation systems to provide compact equipment. However, it is necessary to consider the problem of heat radiation in SIS, as epoxy composite has low thermal conductivity. Therefore, development of high thermal conductivity epoxy composites has been desired for large current class SIS. In this study, we focus on magnesium oxide (MgO), which has a thermal conductivity having low-cost. The developed epoxy composite was filled with MgO having high thermal conductivity and SiO2 having a low coefficient of thermal expansion. By using the estimation equations of thermal conductivity and coefficient of thermal expansion, we could efficiently determine the formulation of the high thermal conductivity epoxy composite. The thermal conductivity of the developed material was 1.39 W/(m·K), which is equivalent to 2.5 times that of conventional material. In addition, other characteristics also showed excellent values, such as 23×10-6/K of the coefficient of thermal expansion and 2,513 mPa.s of viscosity. These values satisfied the required ones for large current SIS. Thermal analysis revealed that applying the high thermal conductivity epoxy composite to 2500 A SIS can reduce the temperature rise by about 10 K. By applying the high thermal conductivity epoxy composite, we are convinced that a large current of SIS with merits such as low maintenance and compactness will be realized.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126513860","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

Investigation of Partial Discharge Activity and Insulation Life of a Large Hydro Generator 某大型水轮发电机局部放电活动及绝缘寿命研究

2019 IEEE Electrical Insulation Conference (EIC) Pub Date : 2019-06-01 DOI: 10.1109/EIC43217.2019.9046557

R. Soltani, Pascalina Gaillardetz, I. Chichkin, Bruce Ledger

引用次数: 1