| With the development of pulsed power technology,the power density of Strong transient pulse has been improved.It is favorable for controlling the process of triggering and staying the system security.And with the tendency of small size for pulse system,the measured circuits must have characteristics of small volume,low weight,and small parasitic parameters.This thesis focuses on the numerical modeling for flat cable and B-Dot.Analyzing the magnetic field around the flat cable.And the feasibility of for measuring KA level current have been validated by B-Dot.The main research contents and achievements are as follows:Firstly,this thesis brings up three numerical modeling:static magnetic field,augment E-field integral equation and quasi-magnetic finite-element according to complexity of modeling.The different structures of flat cable have an effect on H-field have been discussed.Secondly,integration between capacitor discharge circuit and B-Dot have been implemented through frequency domain simulation and FFT.The effect on voltage derived from different structures of B-Dot have been investigated.Thirdly,the results of numerical simulation have been verified by experiments.The polynomial interpolation has been adopting to rectify the mistakes in progress of integration of voltage waveform in B-Dot.The antenna factor of voltage to H-field have been calibrated.And linear interpolation has been applied for rectification on the integral signal.Finally,this thesis researches thermoelectric coupling theory.The numerical model based on Ansys of short-circuit line have been established.The fusing progress of short-circuit line have been analyzed by simulation of multi-physical field.After acquiring cloud chart of temperature,the influence of changes of rise edge of impulse currents and structures of short-circuit line on fused time are analyzed.This thesis prompts filter method based on pauta criterion in wavelet transform to filter noise in fusing waveform of the excited current and B-Dot. |
PDF Full Text Request