Simulation Of Transient In High Efficient Lightning-Protection Transformer

This paper introduced the mechanics of High Efficient Lightning-protection Transformer (HELPT). It also computed the transient of the HELPT on which imposed by lightning waveform by the method of simulation model based on state-space block of the language of Matlab. It's computed results conform to the measured waveforms verywell.This paper is mainly made up of three parts. The first is to analyse the frequency spectrum of some lightning waveforms. It gives references to develop new lightning-protection products based on the frequency spectrum of lightning waveform.The second is to make a single-phase HELPT model and a three-phase HELPT model. Based on the single-phase HELPT model, it is found out that how to get the adjustable capacity and resistance associated the additional coil by experiment.I measure its matrix parameters and set up a mathematical model-state equation based on the predecessors of the field.Its transient of high frequence sine and impulse waveforms is computed by three methods. These are Bergeron's method, the method of directly solving differential equations and the method ofsimulation model based on state-space block of the language of Matlab .Its results conform to the measured waveforms very well. Above of all, the third method is simpleist and best reliable. At last its transient of standard lightning waveform is simulated by the third method. The three phase HELP model is made and the role of the circuit of additional coil is proved by experiment.The third is to custom a three-phase HELPT in a transformer factory .In the process of its producing, I get the related parameters cooperated with the worker of that factory. Its transient of a lightning waveform is simulated by the method of simulation model based on state-space block.