Abstract

Data on characteristics of metal-oxide surge arresters indicates that for fast front surges, those with rise times less than 8us, the peak of the voltage wave occurs before the peak of the current wave and the residual voltage across the arrester increases as the time to crest of the arrester discharge current decreases. That is this device have dynamic characteristics or also call this is frequency-dependent behavior. However, the difficulties are the identification of the model parameters with the simplified way but give the accuracy in simulations. This paper presents a model of metal oxide arresters with a simplified procedure to identify the parameters of the model from the standard manufacturer's data-sheet. This model gives good results with the discharge tests of the manufacturer when the discharge current has a time to crest in the range of l us to 45 us. This comparisons of modeling results and test results demonstrate the accuracy of the model