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GIS用超高频传感器的校准:不同校准方法的比较及一种采用锥形天线的校准系统测试(英文)

高电压技术 2011年第11期37卷 2643-2648页

作者： David Gautschi Pierre Bertholet High Voltage Technology GIS ALSTOM Grid AGOberentfeldenSwitzerland High-Power Electromagnetics Lab ArmasuisseSpiez.Switzerland

Different methods of calibrating ultra high frequency(UHF) sensors for gas-insulated substations(GIS) were investigated in the *** first approach was to use strip lines,triplates and TEM calibration *** cells had already been in use for years for example to test the electromagnetic compatibility of electronic *** smaller the size of the cell,the higher its bandwidth-but the cell should be large enough to not disturb the electric field with the installed sensor under *** overcome this problem,a calibration procedure using a gigahertz transverse electromagnetic (GTEM) test cell and a pulsed signal source were introduced in *** this procedure has many advantages and is easy to understand,measurements show several shortcomings of this calibration *** overcome the disadvantages of the known systems,a calibration cell using a monopole cone antenna and a metallic ground plane were developed and *** UHF sensor was placed in a region with minimum distortion of the electric field due to its *** shows that the new method for calibrating UHF sensors is necessary in order to overcome the limits in the calibration of large sensors and to suppress the propagation of higher order modes and *** to its surprisingly simple structure,its low price and low overall measurement uncertainty,it is the preferred method for calibrating UHF sensors for GIS applications.

关键词： ultra high frequency(UHF) sensors partial discharge detection partial discharge monitoring gas insulated substations(GIS) calibration of sensors calibration cells cone calibration system

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维普期刊数据库

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Estimation of Time to Maximum Rate Under Adiabatic Conditions(TMR_(ad)) Using Kinetic Parameters Derived From DSC-Investigation of Thermal Behavior of 3-Methyl-4-Nitrophenol

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化学推进剂与高分子材料 2011年第1期9卷 84-96页

作者： Bertrand Roduit Patrick Folly Alexandre Sarbach Beat Berger Franz Brogli Francesco Mascarello Mischa Schwaninger Thomas Glarner Eberhard Irle Fritz Tobler Jacques Wiss Markus Luginbühl Craig Williams Pierre Reuse Francis Stoessel AKTS AG TechnoArk 13960 SidersSwitzerland armasuisse Science and Technology Centre3602 ThunSwitzerland Ciba Schweizerhalle AG P.O.Box4002 BaselSwitzerland DSM Nutritional Products Ltd. Safety laboratory4334 SisselnSwitzerland F.Hoffmann-La Roche Ltd Safety laboratories4070 BaselSwitzerland Lonza AG Safety Laboratory VispRottenstr.63930 Visp Switzerland Novartis Pharma AG Novartis CampusWSJ-145.8.544002 BaselSwitzerland Syngenta Crop Protection Münchwilen AG WMU 3120.1.544333 MünchwilenSwitzerland Swiss Safety Institute Schwarzwaldallee 215WRO-1055.5.024002 BaselSwitzerland

Kinetic parameters of the decomposition of hazardous chemicals can be applied for the estimation of their thermal behavior under any temperature *** paper describes the application of the advanced kinetic approach for the determination of the thermal behavior also under adiabatic conditions occurring *** batch reactors in case of cooling *** kinetics of the decomposition of different samples(different manufacturers and batches) of 3-methyl-4-nitrophenol were investigated by conventional DSC in non-isothermal(few heating rates varying from 0.25 to 8.0K/min) and isothermal(range of 200~260℃) *** kinetic parameters obtained with AKTS-Thermokinetics Software were applied for calculating reaction rate and progress under different heating rates and temperatures and verified by comparing simulated and experimental *** application of the heat balance to compare the amount of heat generated during reaction and its removal from the system,the knowledge of reaction rate at any temperature profiles allowed the determination of the temperature increase due to the self-heating in adiabatic and pseudo-adiabatic *** advanced kinetic approach allowed simulation the course of the Heat-Wait-Search(HWS) mode of operation of adiabatic *** thermal safety diagram depicting dependence of Time to Maximum Rate(TMR) on the initial temperature was calculated and compared with the results of HWS experiments carried out in the system with Ф-factor amounting to *** influence of the Ф-factor and reaction progress reached at the end of the HWS monitoring on the TMR is *** calculations clearly indicate that even very minor reaction progress reduces the TMRad of 24h characteristic for a sample with initial reaction progress amounting to *** estimation method can be verified by just one HWS-ARC,or by one correctly chosen ISO-ARC run of reasonable duration by knowing in advance the dependence of the TMR

关键词： adiabatic condition methyl nitrophenol DSC Ф-factor kinetics thermal runaway,TMR

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