On the influence of inclined lightning channel on lightning induced voltage evaluation

Abstract

This paper investigates the influence of inclined lightning channel on induced voltage on the line. The angle variations of inclined lightning channel may cause the voltage to be induced at different values for different points along the power line. This behaviour may affect the line's lightning performance if the peak of induced voltage is greater than the critical flashover voltage (CFO) of the line. This induced voltage is expected to be increased when the inclined angle with respect to the observation point is decreased. Appropriate method of induced voltage algorithm with respect to the incline lightning channel will be developed and compared with other method. The outcome of this study would be useful for the utility for their planning and selection of appropriate protection scheme for the line.

Lightning performance analysis of overhead subtransmission lines in power system

“…The resistance, inductance, and capacitance of the under transient phenomenon are calculated by [13], [14]: A back flashover occurs when a lightning strikes an OHGW or pole of a subtransmission line, resulting in the voltage across the insulators exceeding CFO. BFOR is a product of the number of lightning strikes to the OHGW and a probability of stroke critical current [7], [9], [10], [12]. The critical current is defined as lightning stroke current when injected into the conductor causing flashover.…”

“…The critical current is defined as lightning stroke current when injected into the conductor causing flashover. BFOR = NLP(I) (9) B. Shielding Failure Flashover Rate (SFFOR) SFFOR is the annual number of flashovers on insulators due to shielding failure and can be estimated by the following equation [7], [8], [11]:…”

Effect of lightning induced voltage on the line polymer insulator in a distribution line

“…The induced voltage arises due to coupling between the lightning electromagnetic fields and the power line [1][2][3][4]. Therefore, insulation coordination of the distribution lines and also setting of a proper protection level on the network are important issues.…”