Abstract
In order to study the flashover mechanism of polluted insulators under AC voltage, a new arc propagation criterion which is based on an arc root voltage gradient is proposed. This criterion can explain the variation of the arc root voltage gradient in the arc propagation process. Based on this criterion, a new distributed parameter electrical circuit flashover model of polluted insulators is presented. The arc channel is considered as an equivalent distributed parameter circuit model instead of using the arc voltage-gradient equation. The parameters of the arc model are obtained from the electromagnetic field distribution of the arc and the gas discharge theories. The arc root is considered as parallel paths including the polluted layer. The variation of the voltage on the arc root is related to the capability of arc propagation. This model takes the microscopic mechanism of arc root ionization into consideration, which can improve the accuracy of the flashover model. The results obtained from the presented model are in good agreement with other mathematical and experimental results.
Highlights
The pollution flashover of insulators is one of the main factors threatening the safe operation of the power grid, which can lead to great economic losses to the whole power system, it is of great value to study the pollution flashover characteristics and mechanisms from both the academic and engineering viewpoints
The results indicate that the arc channel inductance and capacitance are negligible compared to the arc channel resistance
The electrical circuit model of the arc propagation along the insulator is represented by electrical circuit network components, which is an efficient method for modeling the flashover process
Summary
The pollution flashover of insulators is one of the main factors threatening the safe operation of the power grid, which can lead to great economic losses to the whole power system, it is of great value to study the pollution flashover characteristics and mechanisms from both the academic and engineering viewpoints. Based on the empirical formula of arc reignition from the arc tests, static and dynamic pollution flashover models were developed and applied for insulation coordination. An AC electrical circuit flashover model of polluted insulators is built on the basis of the former research work on polluted insulators put forward by Chongqing University [14,15] and the flashover model literature mentioned above. This model is based on physical analysis during the arc propagation process. Based on the gas discharge theorem, the variation of arc root voltage gradient is analyzed and introduced into the flashover process of the polluted insulator
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