Risk assessment method and system for power transmission line, and storage medium

Abstract

The invention discloses a risk assessment method and system for a power transmission line, and belongs to the technical field of unconventional safety risk prevention and control of a power system. The risk assessment method for the power transmission line comprises the following steps: acquiring basic parameters of the power transmission line subjected to high-altitude nuclear explosion; establishing a power transmission line multi-conductor transmission cable model on the lossy ground; determining response voltage of the power transmission line under the action of the high-altitude nuclear explosion electromagnetic pulse; obtaining a high-altitude nuclear explosion electromagnetic pulse impact tolerance result of the power transmission line; and determining the risk of the power transmission line under the high-altitude nuclear explosion electromagnetic pulse impact. Whether the power transmission line is affected by the damage of the high-altitude nuclear explosion electromagnetic pulse or not can be judged in advance, the judgment can be used as a reference for transient electromagnetic pulse protection caused by other reasons such as thunder and lightning, and the requirement of an unconventional safety risk prevention and control aspect of a power system is met.

Description

technical field [0001] The present invention relates to the technical field of unconventional security risk prevention and control in power systems, and more particularly, to a risk assessment method, system and storage medium for power transmission lines. Background technique [0002] High-altitude nuclear explosion generally refers to a nuclear explosion with an explosion height higher than 30km. High-altitude nuclear explosion will produce high-altitude nuclear explosion electromagnetic pulse. This is the fifth effect of nuclear explosion in addition to shock wave, photothermal radiation, penetrating radiation and radioactive radiation. A powerful source of electromagnetic interference. The electromagnetic pulse waveform of high-altitude nuclear explosion is mainly divided into three stages, namely early component, middle component and late component. Among them, the spectrum coverage of early components includes signals in intermediate frequency, high frequency, very hi...

AI Technical Summary

Problems solved by technology

The amplitude of the induced current may exceed the lightning withstand level of the insulation of the transmission line, resulting in a flashover of the line insulator strings in a large area, resulting in a short circuit fault, resulting in single-phase grounding or tripping of the line, resulting in interruption of line power supply

The duration of the induced voltage generated by the high-altitude nuclear explosion electromagnetic pulse is short, and the steepness is much greater than the lightning overvoltage. It is uncertain whether the existing zinc oxide arrester can quickly respond to the induced voltage generated by the high-altitude nuclear explosion electromagnetic pulse.

Moreover, under the action of the high-altitude nuclear explosion electromagnetic pulse at the fast front, the inductance of the tower grounding lead and the impact grounding resistance of the grounding body will become larger, which makes the impact of the high-altitude nuclear explosion electromagnetic pulse on the transmission line exceed the effect of lightning

[0004] At present, my country's protection for the safe operation of transmission lines is mainly aimed at the risk of lightning hazards, and there are few studies on the impact of high-altitude nuclear explosion electromagnetic pulses on transmission lines.

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