A Calculation Method for Backlash Trip Rate of UHV Large Span Lines

Abstract

The present invention and a method for calculating the counter-attack tripping rate of UHV large-span lines include the following steps: (1) Based on the Heidler function and the simulation of long uniform transmission lines, the simulation model of lightning current and lightning channel is established, and the Heidler function expression is shown as formula (1 ); (2) Establish the UHV long-span line and tower model to determine the lightning resistance level of the line; (3) According to the lightning location system, the lightning current amplitude distribution probability within the line corridor is fitted to determine the different power frequency voltages Flashover probability under the phase; (4) Determine the lightning density of the long-span line corridor according to the lightning positioning system and GIS system, and convert it into the number of line lightning strikes; (5) Determine the probability of lightning hitting the top of the tower; (6) Determine the surge impact The probability of flashover turning into a stable power frequency arc; (7) Determine the counter-attack tripping rate of UHV large-span lines. The beneficial effects are as follows: Accurate lightning parameters within the transmission line corridor range are obtained through the lightning positioning system and the GIS system, the lightning current amplitude probability distribution formula is fitted, and the relatively accurate line lightning density is calculated.

Description

technical field [0001] The invention relates to the field of environmental monitoring, in particular to a calculation method for counter-attack tripping rate of UHV large-span lines. Background technique [0002] UHV large-span towers are high in height and long in span, and the probability of lightning strikes caused by upward pilots caused by towers and ground wires is high, and it is not easy to repair after a lightning strike accident. Therefore, its lightning resistance performance has always been one of the key issues in the lightning protection protection of transmission lines. one. One of the main reasons for lightning tripping of large-span lines is counterattack. This is because the large-span tower is more susceptible to lightning strikes than ordinary towers; at the same time, the high wave impedance of the tower and the high tower increase the probability of insulation flashover. However, the existing methods for calculating the counter-attack tripping rate of...

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Problems solved by technology

However, this method does not consider the lightning parameters within the line corridor, and the line modeling does not consider the impact of impact corona and grounding resistance, and the calculation results are not accurate.

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