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This paper presents a study of sensitivity of the equivalent circuit of ZnO surge arresters based on the model proposed by the IEEE. The main contribution of the proposed paper consists in some modifications in the fitting procedure of the equivalent LRC circuit of the surge arrester in order to improve the accuracy during electromagnetic transient simulations in power systems. The proposed equivalent...
This paper presents the study of the transient phenomena originating from the shunt reactor energizing and de-energizing at the Bulukumba Substation. The unsymmetrical phase inrush current during a shunt reactor energizing and overvoltages provoked by current chopping are analyzed.
Very high voltage and high power converters inserted in transmission and distribution grids have a strategic role in the operation of the power system of which they are part. Their complete failure is simply not acceptable and, also for this reason, their realizations are highly modular in nature. The exceptionally large number of discrete components characterizing such converters implies that the...
At working voltage levels and under the knee of breakdown, the voltage distribution along ZnO arresters is affected by stray capacitances. The existence of any stray capacitance will cause a non-uniform voltage distribution. When ZnO arrester operates under polluted conditions, it can be stressed with severe non uniform field distribution which could cause external breakdown, internal partial discharges...
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