Validation of ZnO Surge Arresters Model for Overvoltage Studies

Abstract

This paper presents an improvement of the procedure to determine the parameters of the simplified model for metal-oxide surge arresters, derived from the IEEE standard model. The main innovation introduced by the paper lays in the possibility to define an approximate dynamic model even if data about residual voltages for steep current pulse are not defined in the manufacturer's data sheets. This model has a wide rangeability and its effectiveness is good for both medium-and high-voltage arresters. The effectiveness of the model was tested for several arresters of different manufacturers. The residual voltages reported in the datasheets and obtained by the manufacturers through a discharge test are compared with the simulations performed with Matlab. The possibility of defining a dynamic model for surge arresters even with missing data makes the proposed model a useful tool for insulation coordination studies involving steep front transients.

Analysis and comparison of metal-oxide surge arrester models

“…The analysis of papers [1,2,[4][5][6][7][8][9][10] published in dif ferent years shows that basically when comparing dif ferent models of metal oxide surge arresters, the above approach with a series connection of the current source and the surge arrester model is used. In most cases, the residual voltage is determined when model is exposed to lightning current impulses, as well as a steep current impulse.…”

“…In most cases, the residual voltage is determined when model is exposed to lightning current impulses, as well as a steep current impulse. Thus, in [2,5,[7][8][9][10], lightning current impulses and steep current impulses were used. In [1,4,6], in ad dition, switching current impulses were used to determine the residual voltage.…”

Estimation of parameters of metal-oxide surge arrester models using Big Bang-Big Crunch and Hybrid Big Bang-Big Crunch algorithms

“…The two resistances in parallel with the inductances are replaced by one resistance to avoid numerical troubles. The values for L 0 and L 1 are presented in table 1 [5]. The parameters of each model are computed using the electrical characteristic data, obtained from the manufacturersʼ datasheet.…”

“…The parameters of each model are computed using the electrical characteristic data, obtained from the manufacturersʼ datasheet. The equations for the parameter computations of the IEEE and Pinceti models are presented in table 1 [4,5]. Table 2 and 3 present the electrical and physical characteristic data for the examined surge arrester.…”

“…Also with further increase in the time to peak between 45 and 60 µs, the residual voltage is 2-4% lower than that for the 8µs current impulse [1]. In order to obtain more accurate results and reliable estimation in insulation coordination studies, several frequent dependent models of metal oxide surge arresters such as the IEEE and Pinceti models have been proposed [4,5]. A comparative study of the various existing models in the literature showed that the difficulties with these models reside essentially in the calculation and the adjustment of their parameters.…”