Modeling of metal oxide surge arresters

Working Group 3.4.11 on Surge Arrester Modeling has reviewed a number of ways to model metal-oxide arresters. Lab test data of metal-oxide arrester discharge voltage and currents available to the working group have indicated that metal-oxide arresters have dynamic characteristics that are significant for studies involving lightning and other fast-front surges. A model is described which will give an appropriate voltage response for a current surge which has a time-to-crest anywhere in the range of 0.5 mu s to 45 mu s. A method for generating the parameters of the model from published manufacturer's data is presented.<>