2019 20th International Scientific Conference on Electric Power Engineering (EPE)最新文献_第9页

E-mobility Impact on Supply in Distribution Grid 电动交通对配电网供电的影响

2019 20th International Scientific Conference on Electric Power Engineering (EPE) Pub Date : 2019-05-01 DOI: 10.1109/EPE.2019.8778166

M. Kurfiřt, M. Kašpírek, Jan Hlavnicka

引用次数: 3

Detection of Local Softening, Welding and Formation of Metallic Bridges between the Copper Contact Pair Using Temperature Measurement 用测温法检测铜接触副间金属桥的局部软化、焊接和形成

2019 20th International Scientific Conference on Electric Power Engineering (EPE) Pub Date : 2019-05-01 DOI: 10.1109/EPE.2019.8778097

S. David, Dostal Lukas, Valenta Jiri

{"title":"Detection of Local Softening, Welding and Formation of Metallic Bridges between the Copper Contact Pair Using Temperature Measurement","authors":"S. David, Dostal Lukas, Valenta Jiri","doi":"10.1109/EPE.2019.8778097","DOIUrl":"https://doi.org/10.1109/EPE.2019.8778097","url":null,"abstract":"A paper is focused on the analysis of local softening, welding and formation of metallic bridges between the copper contact pair using temperature rise measurement. The contact pair is one of the most important and, at the same time, most problematic parts of the current-carrying path of electrical switching apparatuses, because of its power losses. Amount of power losses is mostly affected by a contact force and by a type of used contact material. Inappropriate choice of these parameters could lead to the extreme heating of contact pair and whole device. A material of contact is affected by a high temperature. Phenomena called local softening and welding may occur due to the high temperature. Metallic bridges create a permanent connection between the contacts. This permanent connection decreases a contact resistance, but unfortunately it disables the function of the entire switching device - the ability to break the electric circuit. The paper shows one of the possible solutions to the problem with on-line detection of phenomena between contact pair using temperature rise measurement.","PeriodicalId":117212,"journal":{"name":"2019 20th International Scientific Conference on Electric Power Engineering (EPE)","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122310788","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

Augmented Reality as a Crucial Element in Modern Electric Distribution Company 增强现实技术在现代配电企业中的应用

2019 20th International Scientific Conference on Electric Power Engineering (EPE) Pub Date : 2019-05-01 DOI: 10.1109/EPE.2019.8778022

Piotr Sylwestrzak, J. Szkutnik

引用次数: 0

Current Sensor with low inductance 低电感电流传感器

2019 20th International Scientific Conference on Electric Power Engineering (EPE) Pub Date : 2019-05-01 DOI: 10.1109/EPE.2019.8778142

B. Skala, V. Kindl, R. Drtina, Jaroslav Lokvenc

引用次数: 2

CAN Bus Comunication using LabViewSystem 用LabViewSystem实现CAN总线通信

2019 20th International Scientific Conference on Electric Power Engineering (EPE) Pub Date : 2019-05-01 DOI: 10.1109/EPE.2019.8777930

M. Kubis, Patrik Beňo, M. Gutten, M. Danko

引用次数: 1

FEM Models of Rotor Failures in Comparison to Real Measurement of IM by External Stray Field 转子故障有限元模型与外部杂散场 IM 实际测量结果的比较

2019 20th International Scientific Conference on Electric Power Engineering (EPE) Pub Date : 2019-05-01 DOI: 10.1109/EPE.2019.8778119

P. Kačor, Petr Bernat

引用次数: 1

Towards the Character and Challenges of Partial Discharge Pattern Data Measured on Medium Voltage Overhead Lines 中压架空线路局部放电模式数据测量的特点与挑战

2019 20th International Scientific Conference on Electric Power Engineering (EPE) Pub Date : 2019-05-01 DOI: 10.1109/EPE.2019.8778019

S. Mišák, J. Fulneček, Tomáš Vantuch, L. Prokop

引用次数: 12

Measurement of acoustic emission velocity in natural ester 天然酯声发射速度的测量

2019 20th International Scientific Conference on Electric Power Engineering (EPE) Pub Date : 2019-05-01 DOI: 10.1109/EPE.2019.8777963

D. Wotzka, M. Kozioł, Ł. Nagi

{"title":"Measurement of acoustic emission velocity in natural ester","authors":"D. Wotzka, M. Kozioł, Ł. Nagi","doi":"10.1109/EPE.2019.8777963","DOIUrl":"https://doi.org/10.1109/EPE.2019.8777963","url":null,"abstract":"Paper presents velocity measurement results of acoustic emission (AE) signal propagating in natural ester. The velocity of AE wave is crucial especially in methods used for partial discharges (PD) localization and its value may influence the location, which is calculated based on arrival time. Experimental works were performed using piezoelectric transducer for AE signal generation (transmitter T) and hydrophone for AE detection (receiver R) immersed in an elongated tank filled with liquid dielectric at various distances d between T and R. The velocity was calculated based on time of arrival (ToA) of the AE signals propagating from T to R and distance d. The transmitted AE signal was modulated using a frequency range from 40 Hz to 400 Hz what enabled to determine the velocity values within the analyzed spectrum. Based on the gathered results it was stated that velocity of AE signal propagating in the considered oil decreases while increasing the distance between T and R. Furthermore the calculated values depend strongly from the frequency of the AE signal. For an exact calculation of location of PD occurring in this type of dielectric the appropriate value of velocity should be considered. It is also recommended that a correction factor related to distance between PD and AE sensor is taken into account.","PeriodicalId":117212,"journal":{"name":"2019 20th International Scientific Conference on Electric Power Engineering (EPE)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126670351","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

Dielectric properties of PVC leads 聚氯乙烯引线的介电性能

2019 20th International Scientific Conference on Electric Power Engineering (EPE) Pub Date : 2019-05-01 DOI: 10.1109/EPE.2019.8778110

V. Šály, J. Packa, V. Ďurman, J. Lelák

{"title":"Dielectric properties of PVC leads","authors":"V. Šály, J. Packa, V. Ďurman, J. Lelák","doi":"10.1109/EPE.2019.8778110","DOIUrl":"https://doi.org/10.1109/EPE.2019.8778110","url":null,"abstract":"In this paper theoretical and experimental results are presented relating to the polarization which appears as a consequence of non-uniform temperature spacing in cable insulation. This temperature gradient has both a short term influence and a long term influence. In the brief time the gradient creates mainly a conduction inhomogenity. This means that the conductivity of insulation adjacent to the heated core is higher than conductivity of insulation at outer radius of the cable. After a long time operation the changes of conductivity became massive due to chemical reactions accelerated in the places with higher temperature. All these processes give rise to the interfacial polarization which is created in insulating material with non-zero gradient of conductivity or permittivity. In our work we try to identify the mentioned interfacial polarization in a specimen of commonly used PVC cable. It was found, that the polarization appears at frequencies of the order of a few mHz. Measurement in this scale requires a special apparatus as it is sensitive to any perturbation. Here we are dealing with the problem of separation of polarization part from the conduction part of dielectric data. Following our experiments the best way of date processing is the use of complex modulus formalism. Experiences with interfacial polarization induced by a temperature gradient will be utilized for monitoring the cable properties during a long-term ageing.","PeriodicalId":117212,"journal":{"name":"2019 20th International Scientific Conference on Electric Power Engineering (EPE)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115513897","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

Complex Electrical Characterization of a-Si/c-Si Solar Heterostructures with Conductive Antireflection Coatings 具有导电增透涂层的a-Si/c-Si太阳能异质结构的复杂电学特性

2019 20th International Scientific Conference on Electric Power Engineering (EPE) Pub Date : 2019-05-01 DOI: 10.1109/EPE.2019.8778044

M. Perný, V. Šály, V. Ďurman, M. Mikolasek, František Janíčck, J. Huran

引用次数: 0