Abstract
The model of surge arrester, which consists of two nonlinear resistors, connected with each other via two inductive and a resistive element is studied. To determine the model parameters are only required by the data given in the catalogs of surge arresters manufacturers. Until now, in the simulation of surge arresters insufficiently investigated the effect of currents typical for lightning surges. It is shown that the model of surge arrester can be investigated by comparing the results of computer simulation with the data given in the catalogs of surge arresters. The study will use the following data, specific both switching and lightning surges: the residual voltage at switching impulse current, the residual voltage at lightning impulse current, as well as the residual voltage at steep current pulse. Residual voltages corresponding to the 250-2000 A standard switching current pulses, 1.5-20.0 kA standard lightning current pulses and 10.0 kA steep current pulses were defined using Micro-Cap model of surge arrester. Residual voltages obtained in the simulation were compared with the corresponding values given in catalogs of surge arresters. It is shown that the smallest error takes place under the influence of lightning current pulses on the model of surge arrester. The model of surge arrester in Micro-Cap program allows high accuracy determination of the residual voltage on the surge arrester during the flow of discharge pulses, which are typical for lightning surges. The model also allows to calculate the transients during the flow of the lightning currents, which are composed with several successive pulses, which can pose a significant danger to the surge arresters. The results of the research can specify the parameters of substation protection against different overvoltages and, thus, reduce economic losses due to possible faults.
Highlights
Surge arrester is one of the main protective devices, that is used in electrical networks for protection from switching and lightning surges
For a fixed amplitude of discharge current pulse, the steeper is the front of a current pulse that passes through the surge arrester, the greater is the residual voltage of surge arrester
Nonlinear elements of the model are referred to the peak value of the residual voltage measured during a passage of 10 kA lightning current pulse with the waveform shape 8/20 μs
Summary
Surge arrester is one of the main protective devices, that is used in electrical networks for protection from switching and lightning surges. For a fixed amplitude of discharge current pulse, the steeper is the front of a current pulse that passes through the surge arrester, the greater is the residual voltage of surge arrester. These and other properties of the surge arresters become important when dealing with the insulation coordination and simulation of lightning protection of substations [2]. Surge arrester model must recreate in the virtual experiment the behavior of the real device and requires study the influence of the current pulses of various wave shape and amplitude
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