Development of Detection Platform for Grid-Connected Photovoltaic Inverters

2012 ◽  
Vol 241-244 ◽  
pp. 145-148
Author(s):  
Tao Yong Li ◽  
Hua Guang Yan ◽  
Jin Hui Xue ◽  
Jin Ping Du
Keyword(s):  
Detection System ◽  
Power Grid ◽  
Practical Application ◽  
Computer Data ◽  
Labview Software ◽  
Testing Method ◽  
Software Interface ◽  
Computer Data Acquisition ◽  
Control Computer ◽  
Development Course

To ensure both performance and security of grid-connected photovoltaic inverters(PVI), a detection platform for grid-connected PVI is researched. The testing method and procedures of grid-connected PVI are analyzed and the development course of this detection platform is described in detail. The detection platform consists of control computer, data acquisition system, RS 485 and GPIB system. In this platform, the solar-cell panel is simulated by programmable DC source, the power grid characteristics of power grid by programmable DC source and the load characteristic by programmable controlled RLC load. The whole detection system is controlled by LabVIEW software interface. The proposed detection platform can be used in the testing of electric performance, protection function, EMC and so on. Practical application shows that the configuration of this detection platform is rational and reliable，and its detection results are accurate.

Synchronized Diagnosis of Laser-Pulse MAG Hybrid Arc Based on Multi-Information

2014 ◽  
Vol 494-495 ◽  
pp. 865-868
Author(s):  
Ying Gao ◽  
Jing Hua Han ◽  
Li Yan Lou
Keyword(s):  
Information Acquisition ◽  
High Speed ◽  
Hybrid Welding ◽  
Computer Data ◽  
Labview Software ◽  
Effect Mechanism ◽  
Welding Technology ◽  
Computer Data Acquisition ◽  
Data Acquisition Card ◽  
Peak Value

Laser-Arc Hybrid welding technology was first introduced by English scholar W.M.Steen in 20th century 70s, developed very rapidly. In order to study the effect mechanism of laser and arc,This paper presents a control strategy,the strategy can collect welding electric information, high speed photos and spectral information synchronously. By using the Labview software, industrial computer, data acquisition card, a high speed camera, spectrometer, synchronous multi-information acquisition system of welding has been established.the system has been used for the hybrid welding experiment, the peak value, base value and platform value of the laser-arc hybrid welding has been collected. Laid the foundation for further diagnosis of laser-arc in a variety of state.

scholarly journals Application of standard and modified Eh-Star test method for induction motor stray load losses and efficiency measurement

2012 ◽  
Vol 9 (3) ◽  
pp. 377-391 ◽  
Author(s):  
Branko Koprivica ◽  
Milos Bozic ◽  
Marko Rosic ◽  
Miroslav Bjekic
Keyword(s):  
Induction Motor ◽  
Accurate Method ◽  
Measurement Procedure ◽  
Theoretical Background ◽  
Test Method ◽  
Computer Data ◽  
Measurement Systems ◽  
Labview Software ◽  
Advantages And Disadvantages ◽  
Computer Data Acquisition

The aim of this paper is to present the application of one simple and accurate method for the measurement of stray load losses (additional load losses) in induction machines. That is the Eh-Star method given in the IEC 60034-2-1 standard. In this paper the theoretical background of the method and the measurement procedure have been explained. All measurements have been performed using modern measurement systems based on a personal computer, data acquisition cards and LabVIEW software. According to the measured results for the stray load losses, the efficiency of the induction motor has been calculated. The efficiency obtained has been compared with the IEC standard efficiency classes, in order to determine the efficiency class of the tested motor. Additionally, measurements have been performed using the modified Eh-Star method. The results obtained have been compared with those obtained using the Eh-Star method. The advantages and disadvantages of both methods have been analyzed in this paper.

scholarly journals RESEARCH AND APPLICATION OF METHODS FOR CALCULATING THE MEASUREMENT UNCERTAINTY OF INDUSTRIAL FLOWMETERS

2020 ◽  
Vol 6 (444) ◽  
pp. 145-153
Author(s):  
S. G. Khan ◽  
◽  
L. K. Ibrayeva ◽  
N. V. Syabina ◽  
Z. M. Yuldashev ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Measurement Uncertainty ◽  
Relative Error ◽  
Electromagnetic Flowmeter ◽  
Standard Uncertainty ◽  
Practical Application ◽  
Labview Software ◽  
Complex Measurement ◽  
Measurement Equations ◽  
Mobile Complex

To create conditions for the recognition of Kazakhstani certificates of conformity and the results of product tests, an assessment of measurement uncertainty is required. In this regard, there has been an increase in the practical application in Kazakhstan of the concept of measurement uncertainty. The authors developed a physical stand for a mobile complex designed to verify electromagnetic flowmeters at the place of operation. To obtain verification results, programs were developed to calculate the uncertainty of an electromagnetic flowmeters using the NI LabView software. In addition, a model for estimating the uncertainty of the relative error of flowmeters was proposed, and the measurement uncertainty was estimated using three methods: standard, Monte Carlo and Kragten. Finally, a comparative analysis was conducted on the results of the estimation of the uncertainty of the relative error of the industrial electromagnetic flowmeter. All methods give standard uncertainty values that do not exceed the acceptable range of relative error (± 1%). However, Monte Carlo method gives better results for sufficiently large number of simulations. No significant differences between the results obtained using standard and Kragten methods were discovered. The Kragten method is preferable in the absence of the need to calculate the sensitivity coefficients when calculating the total standard uncertainty, which is important for complex measurement equations.

A Digital Computer Data Acquisition, Display, and Analysis System for the Gamma Camera

Radiology ◽  
1970 ◽  
Vol 96 (3) ◽  
pp. 658-661 ◽  
Author(s):  
Fred P. Bruno ◽  
Valerie A. Brookeman ◽  
Clyde M. Williams
Keyword(s):  
Data Acquisition ◽  
Digital Computer ◽  
Gamma Camera ◽  
Computer Data ◽  
Computer Data Acquisition ◽  
Analysis System

Modification of IBM-PC Data Acquisition and Control Adaptor for Versatile Data Acquisition and Control System

1989 ◽  
Vol 43 (4) ◽  
pp. 608-611 ◽  
Author(s):  
Haidong Kim ◽  
Matthew J. Zabik ◽  
Stanley R. Crouch
Keyword(s):  
Data Acquisition ◽  
Single Channel ◽  
Data Acquisition System ◽  
Scientific Data ◽  
Modes Of Operation ◽  
Computer Data ◽  
Computer Data Acquisition ◽  
Experiment Control ◽  
Trigger Mode ◽  
And Control

An inexpensive but versatile data acquisition system has been developed with the use of a modified IBM-DACA (IBM Personal Computer Data Acquisition and Control Adaptor). With the modification described, the IBM-DACA can be operated in more various modes of operation. Data can be read either by software trigger or by hardware trigger mode. Also, all the three channels of the on-board timer/counter can be fully utilized for complex or accurate timing and experiment control. This allows gated data acquisition with user-specified timing and a maximum A/D throughput to memory of up to 18520 samples/s in a single channel. With its menu-driven software, this system can be used in various scientific data acquisition environments with minimal expense.

Design of Portable Gas Detector Based on DSP

2012 ◽  
Vol 430-432 ◽  
pp. 1667-1670
Author(s):  
Xiang Dong Zhu ◽  
Tao Han ◽  
Wei Lu ◽  
Lei Xing ◽  
Di Xue
Keyword(s):  
Gas Sensors ◽  
Detection System ◽  
Design Method ◽  
Practical Application ◽  
Experiment System ◽  
Temperature And Humidity ◽  
Gas Detector ◽  
Important Practical Application ◽  
Mixed Gases ◽  
Compensation Function

A new design method of gas detection system was given based on the new DSP processor TMS320F28335. The experiment system takes six metal-oxide semiconducter gas sensors as well as temperature and humidity sensors in comprising the sensor array module, followed the excellent detection principle how to choose, and choose CH4 and H2 as the test samples and use dual-BP neural-network with the temperature and humidity compensation function as the method to recognize and measure single gas and mixed gases respectively. The result shows that the measuring instrument has higher measuring accuracy and overcomes the shortcoming of other methods, and has important practical application value.

Stress Corrosion Cracking of Depleted Uranium Alloys in Moist Salt Ladened Air

CORROSION ◽  
1981 ◽  
Vol 37 (2) ◽  
pp. 81-88 ◽  
Author(s):  
D. F. Hasson ◽  
J. A. Joyce ◽  
C. R. Crowe
Keyword(s):  
Stress Corrosion ◽  
Crack Growth ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Depleted Uranium ◽  
Computer Data ◽  
Computer Data Acquisition ◽  
Heat Treated ◽  
Threshold Data ◽  
Mixed Fracture

Abstract Stress corrosion cracking (SCO in selected depleted uranium alloys in salt ladened moist air environments has been studied by cantilever beam testing. Crack growth kinetics were monitored during the test using a computer data acquisition system. Continuous measurements of crack growth with time showed discontinuous crack growth with increasing KI. Threshold stress intensity values for stress corrosion cracking KISCC, were found to be 24.4 MPa - m½ and 15.6 MPa - m½ for U-3/4 Ti and DU-3/4 Quintalloys, respectively. Values for U-2 Mo in two heat treated conditions were slightly less than the U-3/4 Ti threshold. Data is presented in a “safe zone” plot of flaw size vs applied stress. Fractographic investigation by scanning electron microscopy revealed mixed fracture modes with both transgranular and intergranular fracture occurring.

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