Performance of Large Air Gaps under Lightning Overvoltages: Experimental Study and Analysis of Accuracy of Predetermination Methods

Pigini, A.; Rizzi, G.; Garbagnati, E.; Porrino, A.; Baldo, G.; Presavento, G.

doi:10.1109/mper.1989.4310640

Cited by 29 publications

(12 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Equal-area criterion by Kind [6], [8], [14]; b. Leader development method by Motoyama [4], [12]; c. Leader development method by Pigini et al [8], [13].…”

Section: Flashover Modelsmentioning

confidence: 99%

Mitigation of common mode failures at multi-circuit line configurations by application of line arresters against back-flashovers

Kizilcay¹,

Neumann²

2022

joe

View full text Add to dashboard Cite

Due to the limited number of corridors multi circuit line configurations are often applied. These overhead lines frequently consist of high towers that are subject to lightning strokes. In case of higher current amplitudes and higher footing resistances due to bad earthing conditions back-flashovers are caused leading to common mode failures and to severe outages. The paper describes investigations performed by means of computer simulations to identify the towers of a multi-circuit line consisting of voltage levels 380 kV, 220 kV and 110 kV that are endangered by back-flashovers of the 110-kV double-circuit lines. The footing resistance of towers of the targeted line section has been measured by an instrument at high-frequency. Influence of various factors on the back-flashover over 110 kV insulator strings has been studied by means of EMTP-ATP simulations. Different current waveforms of the lightning stroke have been used to represent the first stroke and subsequent strokes. The towers are represented by the models described in [3], [8]. Available flashover analysis methods [7], [8], [12], [13] like leader development method by Pigini et al and by Motoyama, and voltage-time integration method by Kind have been applied. The towers at which back-flashover is more likely to occur than at other towers are identified by the time integral of voltage according to Kind. Various factors like tower footing impedance, tower surge impedance and tower height are considered. Application of line a surge arrester is shown to be a successful mitigation technique to reduce the back-flashover rate of those 110 kV lines. The lightning overvoltage performance of surge arresters has been analyzed by means of digital simulations. Based on the results of investigations line arresters were installed on the towers in question. Since the installation no further common mode failure has been observed.

show abstract

“…Equal-area criterion by Kind [6], [8], [14]; b. Leader development method by Motoyama [4], [12]; c. Leader development method by Pigini et al [8], [13].…”

Section: Flashover Modelsmentioning

confidence: 99%

Mitigation of common mode failures at multi-circuit line configurations by application of line arresters against back-flashovers

Kizilcay¹,

Neumann²

2022

joe

View full text Add to dashboard Cite

show abstract

“…The leader progression time can be calculated from its speed which is recommended by CIGRE as below [6],…”

Section: Criterion Of Insulation Flashover Based On the Leader Progrementioning

confidence: 99%

Application of the Leader Progression Model in the Insulation Flashover Criterion for Lightning Performance Calculation

Chen

Wen

Lan

2015

Proceedings of the Second International Conference on Mechatronics and Automatic Control

View full text Add to dashboard Cite

It is rather important to exactly evaluate the lightning withstanding level of the transmission line for the system service and the stable operation. In the course, the intersection method is usually adopted as the insulation flashover criterion in the practical project. But due to the difference of the nature lighting waveform and the standard lighting waveform (1.2/50 us), and the effect of the reflection and refraction in the lightning progression process, it may cause a large error by using the intersection method based on the volt-second characteristic curve, which is obtained from the standard lighting impulse in engineering. Several methods of estimating the insulation flashover are in use today. In general, these methods can be divided into those based on the conclusion of insulation breakdown and those derived from the breakdown process. The leader progression model used by CIGRE is one of those methods. In this chapter, several estimation methods of the insulation flashover are investigated and compared. A new insulation flashover criterion is proposed herein on the basis of the experimental results of the leader progression model and the CIGRE insulation flashover criterion. The application of this simulation model and the flashover time under standard lightning impulses are calculated to obtain the volt-second characteristic curve, which corresponds to the results obtained by the experiment. Keywords Leading progression model · Flashover criterion · Lightning impulse · Volt-second characteristic IntroductionThe safety of transmission lines directly affects the safety and reliability of the power system. Thus it will be of great significance to calculate the lightning overvoltage exactly in the case of lightning strike on the transmission lines because it is one of the main faults in the power system.

show abstract

“…In other words, this is the only model that is the closest approximation of the physical processes taking place when breakdown occurs. The time to breakdown, t b , can be expressed as a sum of three components as given in Equation 4 [7,9].…”

Section: Coordination Gap Flashover Modelsmentioning

confidence: 99%

A randomised leader progression model for backflashover studies

Cotton

Kadir

2007

Int Trans Elec Energy Syst

View full text Add to dashboard Cite

SUMMARYInsulation coordination models are an essential part of power system studies and are used to determine the risk of damage to plant during abnormal conditions such as those experienced when lightning strikes the power system. One model used to predict the performance of an overhead line when hit by lightning examines the likelihood of a backflashover; the breakdown of an insulator coordination gap due to a rise in tower potential in comparison to a phase conductor. A backflashover model has many components that must be accurately modelled including the lightning strike, the tower, the shield wire/phase conductors, the insulator coordination gaps and the tower earthing system. Of all of these, the only two significant challenges are the accurate modelling of the insulator coordination gaps and the tower earthing system (the soil ionisation mechanism in particular). This paper focuses on the simulation of the insulator coordination gap for which available models range from a simple voltage controlled switch to the more complex leader progression model (LPM). The paper details the use of experimental data to produce a modified LPM in which certain model parameters are randomly varied. The development of this model using laboratory data is detailed, as is the effect that using this model has on the results of two insulation coordination studies that relate to backflashovers.

show abstract

Performance of Large Air Gaps under Lightning Overvoltages: Experimental Study and Analysis of Accuracy of Predetermination Methods

Cited by 29 publications

References 6 publications

Mitigation of common mode failures at multi-circuit line configurations by application of line arresters against back-flashovers

Mitigation of common mode failures at multi-circuit line configurations by application of line arresters against back-flashovers

Application of the Leader Progression Model in the Insulation Flashover Criterion for Lightning Performance Calculation

A randomised leader progression model for backflashover studies

Contact Info

Product

Resources

About