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A majority of failures in power transmission line are due to trip-out in power transmission line as a result of lightning strike on power transmission line or pole and tower, how to reduce trip-out rate in transmission line becomes focus of attention in electric power system at the present time. The paper has established model for lightning current amplitude and impulse coefficient of ground device...
Based on the Chinese demonstration project of Zhangbei wind-photovoltaic-energy storage (W-PV-ES) hybrid generation, which is the world's biggest and Chinese first new energy utilization platform, the design of grounding system for W-PV-ES Hybrid power station was studied in this paper. Firstly according to the soil resistivity of that power station, measured by the Wenner four-electrode method, the...
Signal demodulation is a key technique for the fiber grating sensor. A new fiber Bragg grating dynamic signal demodulation method based on work-point controlling is present in the paper. The operation principle of the new method and the signal processing scheme of the work-point controlling are expounded systematically. The experiment measurement device is built using the tunable narrow-band laser,...
A new optical fiber birefringence measurement method based on polarization detection and wavelength scanning is presented. The polarization state changes of the dual-polarization mode component along the PMF are theoretically analyzed, and the dependence formula of the optical power output on the scanning wavelength and fiber birefringence is derived. The experimental device is built using a tunable...
Based on the progress of hyperspectral data acquisition, information processing and geological requirements, the current status and trends of hyperspectral remote sensing technology to geological applications are reviewed. The advantages and prospects of hyperspectral remote sensing applications to mineral recognition and mapping, lithologic mapping, mineral resource prospecting, mining environment...
To comprehensively evaluate the safety of large grounding connection, testing and action principle of the main factors that impact the safe operation of grounding connection, were analyzed and studied, and the following conclusions were drew by theoretical analysis and simulation research. While evaluating step voltage and touch voltage, it's inadvisable to consider seasonal factors during the selection...
The theme is try to introduce the calculation software of fuel consumption for heavy truck which is based on Microsoft Access 2003 database management system and object-oriented visual programming language Visual Basic (VB) 6.0. It developed through the analysis of the important factors influencing heavy truck fuel consumption, the database of the actual running vehicle information, the compilation...
To aid the corrosion diagnosis of a grounding grid, test poles are suggested to implant on some nodes. A genetic algorithm based test poles allocation optimization approach is suggested to work out the set of schemes to make all of the branches clear with the least test poles. The N-X+Y principle is put forward, with which, the test pole allocation scheme to make as much as possible branches clear...
A multi-objective hybrid approach based on simulated annealing (SA) is employed to the inverse planning optimization in intensity modulated radiation treatment (IMRT). The test case of irregular field under the condition of water phantom is used to verify the convergence and preciseness of the algorithm. The results show that the approach has favorable behave.
An improved NSGA-II algorithm is applied to the optimization of inverse planning in intensity modulated radiation treatment (IMRT). The test example of irregular field under the condition of water phantom is used to test the inverse planning process of IMRT. The objective functions of PTV (planning target volume) and NT (normal tissue) are based on the average dose distribution. The result of inverse...
In order to make all of the branches of a grounding grid testable, test poles are suggested to implant on some nodes of the grounding grid. A hierarchical simplification model of grounding grids is proposed, based on which, the testability of the branches is evaluated by an iteration approach. A genetic algorithm based test poles allocation optimization approach is presented. The purpose is to make...
To improve the efficiency of the corrosion diagnosis, based on the hierarchical model, an actual grounding grid can be divided into six levels, such as actual grids, quasi- circuit-domain, circuit-domain, circuit-network, touchable network and intrinsic network. Based on above model, a novel node partition based approach is put forward. In which, a grounding grid is divided into several small-scale...
In order to evaluate the testability under the given touchable nodes, a grounding grid is hierarchically simplified into six levels, such as Normal Grounding Grid, Quasi-Circuit- Block, Circuit-Block, Block-Grid, Touchable Grounding Grid and Intrinsic Grounding Grid. The branches of a grounding grid can be classified into two kinds such as clear-branches and uncertain-branches. Rules to classify the...
To benefit the corrosion diagnosis, the concept of uncertain branch group and its corresponding prototype are defined. A node partition method is presented to divide the intrinsic network into several small sub-networks to solve. A set of linear equations about conductance of the intrinsic branches is deduced based on KCL equations. The nonlinear iteration is avoided. An approach to calculate the...
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