Movement early-warning method for power transmission line

Abstract

The invention provides a conductor movement MEMS inertial measurement system constructed by an MEMS accelerometer and an MEMS gyroscope, wherein the acceleration and the angular speed of the movementof a conductor are measured, and then the measured data are pre-processed. The parallelism degree of the conductor is represented by adopting the quadratic sum of the acceleration, and the rotation degree of the conductor is represented by adopting the quadratic sum of the angular speed. An ARMA model is established for the segments of the measured data, and then the FFT (fast fourier transform) transformation is carried out to obtain the frequency distribution of the movement of the transmission conductor. In this way, the main movement degree and the frequency are obtained. The influences ofthe translation and the rotation on the conductor are comprehensively considered, and equivalent comprehensive motoricity and movement effects are constructed. As long as any one of the actually measured comprehensive motoricity and the actually measured sustained effect exceeds a value, the power transmission line is in the risk. When no actually measured value reaches the value, measurement values caused by the continuous wind are changed periodically. The time is calculated through a processor, and the increased change of the movement amplitude of the conductor can be expressed by the change of the comprehensive motoricity. Therefore, the risk condition can be predicted and estimated, and the early-warning information is provided.

Description

technical field [0001] The invention belongs to the technical security field of power grid line movement, and in particular relates to a transmission line movement early warning method. Background technique [0002] Under the influence of different climatic conditions, transmission lines, especially UHV transmission lines, will have different motion amplitudes and frequencies, mainly high-frequency slight-amplitude breeze vibration, medium-frequency and medium-amplitude sub-gap oscillation, and low-frequency large-amplitude galloping Generally speaking, the movement of transmission wires includes three-degree-of-freedom movements such as horizontal, vertical, and twisting. Horizontal and vertical motions can be collectively referred to as translational motions. The axial stress increases and the fatigue limit decreases, which can easily lead to wire breakage; at the same time, the load on the insulator string, cross arm and tower will increase, causing serious disasters such...

AI Technical Summary

Problems solved by technology

There are some published invention patents, focusing on the multi-point monitoring of the accelerometer to quantitatively monitor the movement trajectory of the overhead transmission line, or by collecting the acceleration values ​​at each monitoring point of the transmission line to fit the movement trajectory of the transmission line at each moment , this method is theoretically feasible, but if you want to use the inertial measurement system to realize the positioning of the wire, and then calculate the trajectory posture and position, you need a navigation-level inertial navigation system, because the volume and cost will be large. In addition, these methods An initial value for the inertial measurement system is also needed, but also difficult to obtain, and this value will change over time

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