Method for measuring safety distance between suspension arm of crane and running super high voltage transmission line

Abstract

The invention relates to a method for measuring a safety distance between a suspension arm of a crane and a running super high voltage transmission line. The method comprises the following steps of: detecting a surrounding electric field intensity by using a detecting head arranged on the suspension arm, inputting a detection result into a comparison module and comparing the detection result witha pre-set value; using the strength of an electric field intensity signal as a start / stop signal of the operation of laser distance-measuring equipment; when the electric field intensity signal is higher than the pre-set value, scanning in a semispherical region to measure a distance by using the laser distance-measuring equipment; when the electric field intensity signal is lower than the pre-set value, stopping a distance detection module to reduce the power consumption of the entire detecting head; and arranging a data acquiring and displaying device in an operation room of the crane and transmitting the detection results of a high voltage electric field intensity detection module and the distance detection module to the data acquiring and displaying device in a radio signal transmitting mode so as to display, alarm or control externally. The invention also provides a corresponding safety distance measuring device which can adapt to electric transmission and transformation lines with different voltage levels and different working angles of the suspension arm and can realize low-consumption operation.

Description

technical field [0001] The invention belongs to the measurement field, and in particular relates to a detection method and a device for measuring the safety distance between a crane arm and a live high-voltage transmission line. Background technique [0002] The 500 kV and 220 kV ultra-high voltage transmission lines of the Shanghai EHV power grid geographically involve all districts and counties in Shanghai. [0003] The Shanghai ultra-high voltage power grid is responsible for more than 95% of the power transmission in Shanghai, and is the "aorta" that guarantees Shanghai's power supply. [0004] The safe operation of ultra-high-voltage transmission lines is not only related to the safe and reliable power consumption of the Shanghai Municipal Government, enterprises, businesses, and citizens, but also to the image of Shanghai as an international metropolis and the stability and development of society. [0005] Analyzing the line "external damage" accidents of EHV transmis...

AI Technical Summary

Problems solved by technology

[0009] However, in actual use, it is found that for transmission lines of different voltage levels, at the same distance, the detected electric field strength is different, and vice versa

Therefore, simply setting an electric field strength alarm reference value to adapt to transmission lines of different voltage levels is difficult to meet the actual work needs, and carrying multiple high-voltage line distance measuring devices suitable for different voltage levels at the same time, on the one hand, purchase and maintenance costs Higher, on the other hand, it is easy to confuse in use, but it cannot achieve the proper prevention / alarm effect

[0010] In addition, there are also ultrasonic rangefinders for distance measurement, but due to the thin wires of the transmission line, the distance measurement return wave is very weak, the sensitivity is low in actual use, and the distance measurement effect is poor, which cannot meet the requirements of the work.

[0011] Although the existing laser rangefinder has better ranging accuracy and sensitivity, because the laser probe emits a beam of light, and because the wire of the transmission line is thin, it is difficult to aim in the actual use process, and the aiming / measurement process is difficult. Long, unable to adapt to different boom working angles, unable to automatically measure distance and many other inconveniences

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