Design Of Induction Ray Current Test System

Lightning disaster is one of the natural disaster which human can’t to be avoid and barrier of the major disasters, and lightning is divided into direct lightning and induction thunder lightning. The destruction is enormous, but the direct lightning accounted for the proportion in lightning disaster is far less than the induction thunder lightning. According to statistics, the more 90% destruction is caused by induced lightning. With the fast development of information technology, office automation, intelligence, more and more integrated electronic equipment is caused the harm of lightning disaster on various system, which also is the increasing state. Lightning current parameters are the basis for research of thunder and lightning protection, in which the parameters of lightning current waveform contains are abundant, so the study of lightning current waveform parameter has become a hot topic of lightning research works, and it is the basic of lightning protection.In this paper, combining the present research trends, the induction current waveform would be made some research. The specific content is divided into four parts: First, through comparative analysis of the current domestic external lightning current measuring method, combining with laboratory equipment condition, we determined the induced current measurement method using the PCB type Rogowski coil with sensor, and simulate lightning discharge by the capacitor discharge. This work is an innovation of this paper. Second, the circuit sub-module was studied to determine the components of the model of each module, performing schematic drawing and printed circuit board manufactured by Protel 99 SE, and finally we got the whole system hardware test circuit. Third, the ordinary digital oscilloscope cannot capture the waveform of the signal acquisition processing in the actual measurement of hardware system. Then, we used virtual oscilloscope PicoScope 6 in the signal acquisition processing. Based on this testing platform, induction wave shape under different conditions of the test case, and related parameters and the data were recorded. Analysis of the characteristics of the four parameters, which they are wave head, tail time, induction current amplitude distribution, induction current steepness distribution, was to be done. And the conclusion obtained is that the system with the experimental data on the international general standard reference. Fourth, on the basis of the measured waveform data, we used the matlab function to fitting for the function model through the experimental data. Then randomly selected three groups of induction coils central data and three sets of coils edge data into the proposed combined function verification, we can see the results were substantially coincident. The three lightning current models and the previously proposed were carried on the contrast in order to verify the feasibility of the system.Through the above analysis, we can draw the conclusion. The system design is reasonable, and it not only proves that the capacitor discharge simulation is a feasible scheme, and we explain that the design of PCB type induction coil to be used for measuring the induction waveform, and expand the scale of the coil to be applied to the measurement of lightning electromagnetic induction current, electrostatic induction of the actual. They are provided certain theoretical basis and data support for lightning protection.