Effect of Ambient Temperature Zinc Oxide Surge Arrester Condition Monitoring

2014 ◽  
Vol 554 ◽  
pp. 573-577 ◽  
Author(s):  
Zulkurnain Abdul-Maleka ◽  
Amir Hesam Khavari ◽  
Nabipour Afrouzi Hadi ◽  
Saeed Vahabi-Mashak
Keyword(s):  
Experimental Data ◽  
Zinc Oxide ◽  
Surface Temperature ◽  
Ambient Temperature ◽  
Simulation Analysis ◽  
Simulation Software ◽  
Surge Arresters ◽  
Simulation Results ◽  
Comsol Simulation ◽  
The Relationship

Various methods have been developed to monitor surge arrester condition and predict the probable interruption which can be caused by the failure of surge arresters. This paper aims to carry out experimental and simulation work to find the relationship between the aging level, arrester surface temperature and ambient temperature. COMSOL simulation software was used for the modeling of 120kV rated gapless ZnO surge arresters. It is observed from both the simulation analysis and experimental data that the leakage current and temperature increase as a consequence of an increase in the applied voltage across the arrester. The thermal profile of the ZnO surge arrester changes depending on the aging level and the ambient temperature. The surface temperature simulation results compare well with the experimental results, for the case of varying aging levels.

scholarly journals Impact of Modeling Simplifications on Lightning Strike Simulation for Aeroengine

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Yi-fan Qian ◽  
Zhi-feng Ye ◽  
Hai-bo Zhang
Keyword(s):  
Simulation Analysis ◽  
Simulation Software ◽  
Simplified Model ◽  
Lightning Strike ◽  
Electromagnetic Simulation ◽  
Experimental Conditions ◽  
Turbofan Engine ◽  
Engine Model ◽  
Simulation Results ◽  
The Difference

With the development of electromagnetic simulation software and affordable hardware, it is allowed for us to complete simulations for EMC purposes. However, simulation demands will be immense when simulations for models with complex structures, especially aircraft components, have to be solved. Hence, it is meaningful to investigate how to minimize the computational demands. One of the solutions to reduce the simulation expense is the simplification for the simulated model. But the simplified model should be guaranteed to provide credible simulation results which do not deviate from the original model apparently. Generally, the difference between the simulation results and experimental data is estimated, or if the experimental conditions are not achieved, the comparison between the simplified model and the original one has to be analyzed, at least. This paper explores the electromagnetic simulation of a turbofan engine encountering lightning strike. With the simplifications of different components on the turbofan engine, the influences on induced currents of engine controller cables are simulated and analyzed based on the transmission-line matrix method. A combining method of components removal and geometric structure simplification is proposed to simplify the whole engine model. Simplified components include compressor, combustion chamber, turbine, and nozzle. The effects of different simplification methods are quantified, and the rationality of the simplified model is verified by simulation analysis.

Spatial Concentration Variation of Contaminants in a Residential Kitchen and the Effect of Makeup Air System

2012 ◽  
Vol 610-613 ◽  
pp. 1996-1999
Author(s):  
Xin Jia ◽  
Bo Yi
Keyword(s):  
Experimental Data ◽  
Organic Compound ◽  
Volatile Organic Compound ◽  
Simulation Software ◽  
Total Volatile ◽  
Spatial Concentration ◽  
Total Volatile Organic Compound ◽  
Distribution Law ◽  
Volatile Organic ◽  
Simulation Results

In this paper, the experimental data of CO, CO2 and total volatile organic compound (TVOC) concentration in a residential kitchen are presented. Based on them, a simulation software with friendly and simply operating interfaceis is developed on the platform of VC++. The distribution law of the contaminants is studied via the simulation results, and it is obvious that location of accumulation of the contaminants are highly relevant to the location of stove and closer to the walls. An addition natural air makeup system is proposed to improve indoor airenvironment in kitchens, the effection of the air makeup system is analyzed with exergy theory.

scholarly journals The influence of climatic conditions on the efficiency of the solar system

2020 ◽  
Vol 167 ◽  
pp. 05002
Author(s):  
Viacheslav Shemelin ◽  
Tomas Matuska
Keyword(s):  
Solar System ◽  
Solar Collector ◽  
Simulation Analysis ◽  
Climatic Conditions ◽  
Simulation Software ◽  
Hot Water ◽  
Apartment Building ◽  
Time Step ◽  
Simulation Results ◽  
One Year

The simulation analysis of the solar hot water preparation system for an apartment building is presented. The analyses investigated the effect of climatic conditions on the efficiency of the solar system. To demonstrate the influence of climatic conditions, four building locations (Stockholm, Prague, Milan, and Barcelona), six different solar collectors, and six different design areas of solar collector field were used. The aim was to verify how the efficiency of the solar system varies depending on the climatic and design conditions. Moreover, the influence of year-to-year fluctuations of climatic conditions was also explored. The analysis has been provided by using TRNSYS simulation software over the period of one year using the time step of 2 minutes. The simulation results clearly showed that the efficiency of the SDHW system is dependent on the climatic conditions, especially on the air temperature. On the other hand, year-to-year weather fluctuations do not strongly affect the efficiency of the SDHW system.

Simulation and Experimental Study on the Impact of Breadth of Back Blade on Axial Force Balance

2011 ◽  
Vol 130-134 ◽  
pp. 1568-1572
Author(s):  
Hui Wang ◽  
Jie Gang Mu ◽  
Miao Yin Su ◽  
Shui Hua Zheng ◽  
Jin Jing Zhao ◽  
...  
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Experimental Study ◽  
Axial Force ◽  
Three Dimensional ◽  
Force Balance ◽  
Simulation And Experiment ◽  
Simulation Results ◽  
The Impact ◽  
The Relationship

The paper studies the relationship between axial force and breadth of back blade by numerical simulation and experiment. On the basis of the RNG k-ε turbulence model and technology of compact local grids and regional computing, three dimensional numerical simulations to 100HZ165-250 centrifugal pump with various breadths were carried out. Through comparing and analyzing of the flow field, it can be seen that the axial force reduces with the increase of the back blade breadth. After that, the simulation results were verified by the experimental data got from different test devices, and it shows that the conclusions are reliable.

Micro-Defects Test Simulation Analysis and Experiment Research under Alternating Electromagnetic Excitation

2013 ◽  
Vol 798-799 ◽  
pp. 452-455
Author(s):  
Xia Yu ◽  
Wei Ming Zhang ◽  
Zhong Chao Qiu ◽  
Cheng Feng Chen
Keyword(s):  
Simulation Analysis ◽  
Crack Depth ◽  
Simulation Software ◽  
Good Effect ◽  
Electromagnetic Simulation ◽  
Test Results ◽  
Current Field ◽  
Electromagnetic Excitation ◽  
Simulation Results ◽  
Alternating Magnetic Fields

Alternating current field Measurement is one of the important progresses about electromagnetic nondestructive testing in recent years. Alternating magnetic fields excitation testing model is established by using electromagnetic simulation software ANSOFT, a flat plate crack defects are simulated. By analyzing its principle, crack depth and the width change influence on test results, finally the simulation results are verified by the method of experiment. The experimental results are consistent with the simulation results. The results show that this differential probe has good effect on crack defects test.

Effect of Ambient Temperature on Leakage Current of Gapless Metal Oxide Surge Arrester

2013 ◽  
Vol 64 (4) ◽  
Author(s):  
C. L. Wooi ◽  
Zulkurnain Abdul-Malek ◽  
Saeed Vahabi Mashak
Keyword(s):  
Zinc Oxide ◽  
Ambient Temperature ◽  
Temperature Variation ◽  
Leakage Current ◽  
Electrical Power ◽  
Ambient Conditions ◽  
Electrical Power System ◽  
Surge Arresters ◽  
Routine Monitoring ◽  
Custom Made

Zinc oxide (ZnO) gapless surge arresters are used for lightning and overvoltage protection in electrical power system. The leakage current monitoring is one of the well known method for the ZnO surge arrester ageing level determination. However, the ZnO leakage current is known to be dependent on the ambient temperature. This paper aims to study the effects of temperature variation due to ambient conditions on the leakage current of ZnO surge arrester. The effect of a significant increment of leakage current with an increase in temperature may result in a wrong assesment of the ageing level of the arrester. The leakage current of three 120kV rated polymeric housed ZnO surge arresters were measured in a custom made thermally insulated enclosures at varying temperatures. Up to 20% increase in the leakage current was observed with a 20°C increment above the ambient temperature. For a typical variation of ambient temperature in Malaysia in the range of between 30°C and 40°C, the corresponding changes in the leakage current can be up to 11%. The temperature does significantly affect the leakage current measurements used for monitoring of zinc oxide surge arresters. This significant change in the leakage current due to ambient temperature variation can affect the decision in assessing the condition of surge arresters during routine monitoring.

Numerical Simulation of 6061 Aluminum Alloys during the Semi-Solid Backward Extrusion

2011 ◽  
Vol 52-54 ◽  
pp. 1532-1537
Author(s):  
Shu Zhen Shang ◽  
Gui Min Lu ◽  
Xiao Ling Tang ◽  
Zu Xin Zhao ◽  
Wei Cao
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Deformation Behavior ◽  
Processing Parameters ◽  
Stress And Strain ◽  
Backward Extrusion ◽  
Simulation Results ◽  
Semi Solid ◽  
Distribution Of Stress ◽  
The Relationship

Effects of deformation temperature and strain rate on deformation behavior of semi-solid 6061 alloy were investigated on Gleeble3800 thermal-mechanical simulator. On basis of the experimental data of semi-solid 6061, a model was established to describe the relationship between the processing parameters and flow stress, which showed that the experimental results and calculation ones fitted well. It would be beneficial to realize the distribution of stress and strain during the semi-solid forming on the basis of numerical simulation technology. This research paper presented the numerical simulation results of the 6061 alloy during the backward extrusion thixoforming process.

scholarly journals Simulation Analysis on Partial Discharge Signals Produced by Multiple Insulation Defects in GIS

2020 ◽  
Vol 165 ◽  
pp. 06040
Author(s):  
Yuxin Yun ◽  
Guangke Xu ◽  
Weiwei Zhang ◽  
Xing Li ◽  
Lingying Chen
Keyword(s):  
Electromagnetic Field ◽  
Simulation Analysis ◽  
Partial Discharge ◽  
Simulation Software ◽  
Impact Response ◽  
Current Signal ◽  
Linear Convolution ◽  
Simulation Results ◽  
Gas Insulated Substation ◽  
Linear Mixtures

In this paper, the simulation analysis on partial discharge (PD) signals produced by multiple insulation defects in gas insulated substation (GIS) has been researched by the simulation software of electromagnetic field (XFDTD). The theoretical analysis and simulation results show that the single partial discharge signal is the linear convolution of the partial discharge current signal and its corresponding impact response in GIS. The mixed partial discharge signals are the linear mixtures of every partial discharge signal.

scholarly journals GW46 High Voltage Isolation Switch Solid-Heat Coupling Simulation Analysis and Experimental Study

2020 ◽  
Vol 179 ◽  
pp. 01004
Author(s):  
Yuyang Song ◽  
Benxue Liu ◽  
Qinghui Wang ◽  
Peng Yuan
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Contact Pressure ◽  
High Voltage ◽  
Mechanical Characteristics ◽  
Simulation Analysis ◽  
Three Dimensional ◽  
Simplified Model ◽  
Clamping Force ◽  
Simulation Results

Taking the high⁃voltage disconnector of the GW46 type as research object, this research first use Solidworks to build its three-dimensional simplified model, then use ABAQUS to simulate the mechanical characteristics of the disconnector over a wide temperature range, analyzing the influence of the clamping force between the dynamic and static contacts on temperature, the contact pressure between the dynamic and static contacts of the high⁃voltage disconnector of the GW46 type increases with the ambient temperature, and the contact pressure becomes smaller. Compared simulation results with experimental data, the error is less than 5%. Analysis shows that using the ABAQUS to simulation analysis of temperature rise of the high⁃voltage disconnector of the GW46 type, it can be determined that the contact pressure between the dynamic and static contacts changes with temperature. It avoids the complexity of the traditional theoretical calculation of query parameters and tedious calculations, and provides strong reference evidence for improving the reliability of the high⁃voltage disconnector of the GW46 type.

Optimal Installation Scheme of Surge Arrester on Distribution Network

2015 ◽  
Vol 1092-1093 ◽  
pp. 304-309
Author(s):  
Ao An Li ◽  
Feng Yue ◽  
Man Cheng Xi ◽  
Zhi Yi Jia ◽  
Jun Kang Ni ◽  
...  
Keyword(s):  
Distribution Network ◽  
Simulation Models ◽  
Lightning Stroke ◽  
Effective Measure ◽  
Lightning Strikes ◽  
Economical Efficiency ◽  
Surge Arresters ◽  
Distribution Line ◽  
Simulation Results ◽  
The Relationship

Surge arrester is an effective measure to protect distribution lines from lightning strikes. But high costs will be spent on the maintenance of a great many surge arresters in 10kV distribution line. Taking the relationship between reliability and economical efficiency into consideration, aiming at installation density of surge arrester, this paper established the effective simulation models of direct lightning stroke overvoltage and induced overvoltage by ATP-EMTP. Finally, this paper presented the optimal installation scheme of surge arrester on the basis of the simulation and analysis of the lightning withstand level. The simulation results provide references for the optimal installation scheme of surge arrester on the distribution network.

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