Experimental study and analysis of breakdown characteristics of long air gaps with short tail lightning impulse

Experimental Study and Analysis of Insulator Breakdown Characteristics with Short-tail Lightning Impulse

“…A rectangular pulse with a rise time of 20 μs and duration of 4 μs, and a slow-front wave with a rise time of 3 μs are injected into the top of the tower [1]. In Fig.…”

“…Previous studies on insulator breakdown characteristics are usually on the condition of standard lighting impulse. However, recently more researches show that the measured voltage waveform on the insulator by a direct lightning stroke is a short-tail lightning impulse, and more researches on insulator breakdown characteristics and models are based on short-tail lightning impulse [1][2][3][4]. Therefore, these results on standard lighting impulse are not applicable to describe an accurate lightning overvoltage process, and the differences may cause errors in the evaluation of lightning performance.…”

Monte Carlo method for estimating backflashover rates on high voltage transmission lines

“…Interested reader is advised to consult Refs. [13,[27][28][29] for more information. Hence it is usually modelled in the EMTP-ATP software package by means of the voltage-controlled switches.…”

Flashover Analyses of 500 kV Transmission Towers with Capacitive Grounding Resistance

“…[21], Ueta et.al. [22] and Motoyama [23] are especially regarded as useful models to express the flashover phenomena.…”

“…While the value of capacitance in the present analysis was assumed as a constant value of 750nF for simplification, the value should be determined considering each particular circumstance of transmission tower including resistivity and dielectric constant of surrounding soil, the shape of tower footing base and so on. Moreover, the model for flashover and surge impedance of tower should be improved to more appropriate and latest ones [23], [24].…”