کنفرانس مهندسی برق ایران

صفحه اصلی / سی و سومین کنفرانس بین المللی مهندسی برق

Ground-based Power Line Sag Measurement by Combining Data from a Smartphone and a Laser Rangefinder

نویسندگان :

Mohammad Javad Abdollahifard¹ Reza Bahrami²

1- Tafresh University 2- Tafresh University

کلمات کلیدی :

Laser rangefinder،3D wire modelling،power line inspection،single-view،machine vision

چکیده :

Sag amount is a key parameter in overhead power lines that should obey a particular standard according to conductor type and span, electrical load, and ambient temperature. Failure to comply with these standards may lead to excessive tension on the conductors or increase the possibility of their collision, reducing the network's resilience particularly in severe weather conditions. Sag measurement with existing devices typically entails de-energizing power lines, climbing the poles, and/or field calibration of instruments; and hence is time-consuming and/or risky for the crew. In this paper, a new ground-based device is developed that enables the crew to measure the sag remotely from a wide range of perspectives. This is realized by combining the data form a digital camera, an accelerometer, a laser rangefinder, and a temperature sensor. By including prior knowledge on the wire locus and shape in our modeling process, only two laser range data needs to be acquired to convert the image position information to a 3D wire model in the real world. This can be done without the need to direct the laser beam at a wire with small cross section. Our experiments show that using the proposed device, one person can independently measure the sag and span amount and compare them with standard values in less than 4 minutes with the average absolute error of about 3%, which meets the requirements of the industry.