Abstract
In this contribution, a mathematical model allowing for the prediction of the AC surface arc propagation on polluted insulators under non-uniform electric field is proposed. The approach is based on the experimental concept of Claverie and Porcheron. The proposed model, which makes it possible to reproduce the surface electric discharge, includes a condition for arrest of the propagating discharge. The electric field at the tip of the discharge is the key parameter governing its random propagation. A finite element approach allows for mapping of the electric field distribution while the discharge propagation process is simulated in two dimensions. The voltage drop along the arc discharge path at each propagation step is also taken into account. The simulation results are validated against experimental data, taking into account several electro-geometric parameters (distance between electrodes, pollution conductivity, radius of high-voltage electrode, length of the plane electrode). Good agreement between computed and experimental results were obtained for various test configurations.
Highlights
For the safe operation of any power system network, it is important that key equipment such as transmission line hardware operate properly for many years
The physics of the flashover of polluted insulators is still not completely understood due to the complexity of the involved phenomenon resulting from the interaction of the electric field, pollution layer, and environmental conditions [6]
The electric field decreased with increasing D or Rp, requiring a higher level of applied voltage to generate a conductive current and dry bands that stimulate generation of arcs, leading to flashover
Summary
For the safe operation of any power system network, it is important that key equipment such as transmission line hardware operate properly for many years. The electrical arc discharges, initiated from the cylindrical electrode, propagate by stepping randomly along the polluted insulator plate once the field exceeds the threshold level computed at each time step. The comparison of the computed and measured flashover results indicates the validity of the proposed model for predicting the breakdown voltage From this contribution, explicit information onto the influence of the electro-geometrical parameters on the electric field distribution that affects the flashover process of the polluted insulators is reported. 2. Laboratory Model The rod–plane arrangement constitutes one of the basic configurations in the investigation of non-uniform electric fields and insulation properties in high-voltage studies [25,26]. It is assumed that distance between the centre of the circular electrode and the end of the plane electrode is ‘XL’
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