Contamination Flashover, Part I: Theoretical Aspects

Jolly, David C.

doi:10.1109/tpas.1972.293401

Cited by 47 publications

(27 citation statements)

References 16 publications

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“…But it is not clear why a constraint of constant current is imposed, rather than the actual constraint of constant voltage [22]. However, during the arc propagation, there are multiple dissipative sources like light and radiation besides the arc and pollution layer.…”

Section: Basic Ac Mathematical Flashover Model Of Polluted Insulatorsmentioning

confidence: 99%

“…The applied voltage which is a constant is centralized on arc root continuously in process of arc propagation. The field at the arc root concentrates and brings about the flashover later [22]. Therefore, during the propagation of the arc, the arc root voltage gradient variation is significant for both arc propagation and the final flashover.…”

Section: The Arc Root Voltage Gradient Variation During Arc Propagationmentioning

confidence: 99%

“…The voltage gradient of arc root has a decisive effect on the formation of new ionization. Jolly considered that pollution flashover is essentially an electrical breakdown process caused by the field concentration at the discharge tip [22], so the arc root voltage gradient criterion is proposed as follows:…”

Section: The Arc Root Voltage Gradient Criterionmentioning

confidence: 99%

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Electrical Circuit Flashover Model of Polluted Insulators under AC Voltage Based on the Arc Root Voltage Gradient Criterion

et al. 2012

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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.

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Section: Basic Ac Mathematical Flashover Model Of Polluted Insulatorsmentioning

confidence: 99%

Section: The Arc Root Voltage Gradient Variation During Arc Propagationmentioning

confidence: 99%

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Electrical Circuit Flashover Model of Polluted Insulators under AC Voltage Based on the Arc Root Voltage Gradient Criterion

et al. 2012

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“…Therefore, in order to study this phenomenon in detail, several researchers made of use simplified physical models, such as a water channel [5,69,84], a triangular plane [68], a flat disc [70,97] or a cylindrical sample [62].…”

Section: Arc Propagation Criteriamentioning

confidence: 99%

“…Such possible external forces may include: (i) staticelectrical force, (ii) electromagnetic force and (iii) thermal floating force. Using a discharge current of 100 mA, a polluted surface resistance of 50 kfi, and an arc root radius of 0.5 cm, Jolly [69][70][71][72] calculated the forces acting on the arc root. The results…”

Section: Arc Propagation Criteriamentioning

confidence: 99%