A dance prevention method for UHV horizontally arranged transmission lines

Abstract

The invention discloses an anti-swinging method of an extra-high voltage horizontally-arranged power transmission line. The anti-swinging method comprises the following steps of A, determining hanging point positions of phase-ground spacing rods on a middle-phase wire according to span of the power transmission line; B, determining a prevailing wind direction of a region where the power transmission line is located, and calculating an included angle between the prevailing wind direction and a power transmission line direction; C, determining hanging point positions of phase-ground spacing rods on other two phase wires so that hanging points of the phase-ground spacing rods on the three wires are on a straight line and the included angle between the straight line and the prevailing wind direction is zero; D, determining a position of a common ground anchor so that the phase-ground spacing rods on the three phase wires and the common ground anchor are connected and then are arranged in the same vertical plane; and E, separately installing the three phase-ground spacing rods on the three phase wires, and adjusting wire drawing length of lower ends of the three phase-ground spacing rods so that pre-tightening forces of the phase-ground spacing rods at 0 DEG C are maintained between 3kN and 5kN. By the anti-swinging method, a favorable anti-swinging effect of the phase-ground spacing rods can be ensured when the power transmission line swings, and the safety running of the line is ensured.

Description

technical field [0001] The invention relates to the technical field of galloping prevention for power transmission lines, in particular to a galloping prevention method for UHV horizontally arranged power transmission lines. Background technique [0002] The increasing development of the scale of the power grid and the frequent occurrence of severe weather have resulted in a significant increase in the frequency and degree of harm of galloping in transmission lines. Light galloping in transmission lines can lead to phase-to-phase flashover, damage to ground wires, conductors, fittings and related components, and severe This will lead to line tripping, power outages, disconnection of towers, etc., especially the galloping of UHV transmission lines, which will affect a wider range and cause greater economic losses, seriously threatening the safe and stable operation of the power grid. At present, interphase spacers are widely used to control the problem of line galloping, but ...

AI Technical Summary

Problems solved by technology

[0002] The increasing development of the grid scale and the frequent occurrence of severe weather have resulted in a significant increase in the frequency and degree of harm of galloping in transmission lines. Light galloping in transmission lines can lead to phase-to-phase flashover, damage to ground wires, conductors, fittings and related components, and severe It will lead to tripping and power failure of the line, disconnection of the tower, etc., especially the galloping of the UHV transmission line, which will affect a wider range and cause greater economic losses, seriously threatening the safe and stable operation of the power grid.

At present, interphase spacers are widely used to control the problem of line galloping, but in recent years, a large number of interphase spacer or its supporting hardware flashover and fatigue fracture accidents have occurred frequently. The phase-to-ground insulation level is high, and the phase-to-phase spacer bears the line voltage during operation, the probability of phase-to-phase flashover is high, and the insulation cost is high; and the phase-to-phase spacer has a poor inhibitory effect on the galloping of horizontally arranged lines at different stages

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