scholarly journals DETERMINATION OF WIRE SWING BOOM OF OVERHEAD POWER TRANSMISSION LINES IN ICE FORMATION MONITORING DEVICE BASED ON PHYSICAL SIMULATION RESULTS

Author(s):  
В.И. Пантелеев ◽  
А.В. Малеев

Стрела провеса является важным параметром для безопасной эксплуатации воздушных линий электропередачи и может быть использована в качестве одного из основополагающих критериев анализа интенсивности гололедообразования. В данной статье рассматривается возможность определения стрелы провеса при закреплении на одном из проводов фазы датчика, измеряющего угол между проводом и плоскостью земли в непосредственной близости от опоры. Для формализации эмпирической зависимости был проведен натурный эксперимент, моделирующий физические свойства провеса провода ВЛ, размещенного на опорах. Обработка полученных данных и аппроксимация эмпирической функции была реализована в среде MATLAB. После обработки данных была получена эмпирическая функция, которая может быть использована в автономных системах мониторинга для контроля стрелы провеса провода. Автономное устройство мониторинга гололедной обстановки на проводах ВЛ, разработанное авторами, для которого была найдена рассматриваемая эмпирическая зависимость, позволяет следить за интенсивностью гололедообразования, а также контролировать массу гололедных отложений и среднюю толщину стенки гололеда. Информация о гололедной обстановке передается на диспетчерский пункт посредством GSM модема. Увеличение интенсивности гололедных отложений вызывает увеличение стрелы провеса провода, относительно его колебаний, обусловленных технологическими параметрами, поэтому система мониторинга гололеда включающая анализ угла провеса провода является аналогом тензометрических датчиков тяжения, но не требует реконструкции ВЛ и отключения последней на время модернизации. Устройство оборудовано также дополнительными датчиками, что позволяет увеличить вероятность правильного обнаружения опасной гололедной обстановки. The sagging boom is an important parameter for the safe operation of overhead power lines and can be used as one of the fundamental criteria for the analysis of ice formation intensity. This article discusses the possibility of determining the sagging boom when a sensor phase is fixed to one of the wires, which measures the angle between the wire and the ground plane in the immediate vicinity of the support. To formalize empirical dependence, a full-scale experiment was conducted that simulates the physical properties of the LL wire held on supports. The processing of the obtained data and the approximation of the empirical function were implemented in the MATLAB environment. After processing the data, an empirical function was obtained that can be used in autonomous monitoring systems to control the wire sagging boom.An Autonomous device for monitoring the ice situation on the overhead lines, developed by the authors, for which the empirical dependence was found, al-lows to monitor the intensity of ice formation, as well as to control the mass of ice deposits and the average thickness of the ice wall. Information about the ice condi-tions is transferred to the control station via GSM modem. An autonomous device for monitoring the ice situation on VL wires, developed by the authors, for which the considered empirical dependence was found, allows you to monitor the intensity of ice formation, as well as control the mass of ice deposits and the average thickness of the ice wall. Ice information is transmitted to the control room via the GSM modem. Increasing the intensity of icy deposits causes an increase in the wire sag boom relative to its fluctuations due to process parameters, therefore, the ice monitoring system including analysis of the wire sag angle is an analogue of strain gauges, but does not require reconstruction of the VL and disconnection of the latter during modernization. The device is also equipped with additional sensors, which increases the probability of correct detection of a dangerous ice situation.

2020 ◽  
Vol 220 ◽  
pp. 01071
Author(s):  
Dmitry Ivanov ◽  
Marat Sadykov ◽  
Aleksandr Golenishchev-Kutuzov ◽  
Danil Yaroslavsky ◽  
Tatyana Galieva ◽  
...  

The length of overhead power transmission lines in the Russian Federation is over 2.8 million kilometers. Power grids are rapidly becoming obsolete. The level of deterioration of the equipment achieves 70% [1]. This leads to breakdowns on overhead power transmission lines and reduce the quality of electricity supply. One of the focus areas towards improving the situation is a deep modernization of the power grid with an orientation on energy efficiency. The purpose of this work is the creation a system for operative monitoring of the technical condition of high-voltage power-transmission lines based on modular devices. The modular device is configured depending on the issues at hand: control of ice formation; control of ice melting; localization of the place of short circuit, breakage, lightning strike; determination of electrical loads on the wire or control of the load of overhead power transmission lines; determination of mechanical loads at the wire suspension point; determination of conditions for the occurrence of ice formation, determination of defects in insulators. This will equip the overhead line diagnostic systems without serious financial costs by simple installation on the wire of the developed device which design allows to change the configuration of the equipment and solve a wide range of tasks.


Author(s):  
M. P. Goryachev ◽  
M. F. Sadykov ◽  
D. A. Yaroslavskiy

Structural elements of overhead power transmission lines are experiencing both horizontal and vertical loads. Wires and cables are elements of the overhead power line, on which changes in mechanical loads are observed to a greater degree. This occurs due to the change in the tension force of the wire/cable depending on the temperature and the formation of icy-rime deposits on it, as well as fluctuations in wind gusts. The article describes the most common systems and methods for determining the mechanical loads on an overhead power transmission line. A method is proposed for calculating the mechanical loads on an overhead transmission line based on mathematical models of a flexible wire, rope and a model for determining ice deposits on wires, taking into account the rotation of the wire/cable around its axis. A comparison of the improved inclinometry method with the method developed earlier for the case of formation of ice deposits on the S-50 cable has been carried out. A comparison was made on the error in determining the tension of the S-50 ground-wire protection cable using the method developed to control the mechanical parameters of overhead power lines, which takes into account the wire/cable rotation around its axis and the method for determining icy-rime deposits developed earlier. The developed method allows determining the elongation of the wire/cable in the span with one anchor support, as well as the strength of its tension with greater accuracy. However, additional clarification is required due to the influence of the wind, the formation of icy-rime deposits of various shapes, as well as the structural limitations of the wire/cable rotation when attaching it to the support.


2016 ◽  
Vol 2016 (4) ◽  
pp. 8-10 ◽  
Author(s):  
B.I. Kuznetsov ◽  
◽  
A.N. Turenko ◽  
T.B. Nikitina ◽  
A.V. Voloshko ◽  
...  

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1561
Author(s):  
Hao Chen ◽  
Zhongnan Qian ◽  
Chengyin Liu ◽  
Jiande Wu ◽  
Wuhua Li ◽  
...  

Current measurement is a key part of the monitoring system for power transmission lines. Compared with the conventional current sensor, the distributed, self-powered and contactless current sensor has great advantages of safety and reliability. By integrating the current sensing function and the energy harvesting function of current transformer (CT), a time-multiplexed self-powered wireless sensor that can measure the power transmission line current is presented in this paper. Two operating modes of CT, including current sensing mode and energy harvesting mode, are analyzed in detail. Through the design of mode-switching circuit, harvesting circuit and measurement circuit are isolated using only one CT secondary coil, which eliminates the interference between energy harvesting and current measurement. Thus, the accurate measurement in the current sensing mode and the maximum energy collection in the energy harvesting mode are both realized, all of which simplify the online power transmission line monitoring. The designed time-multiplexed working mode allows the sensor to work at a lower transmission line current, at the expense of a lower working frequency. Finally, the proposed sensor is verified by experiments.


IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Vedanta Pradhan ◽  
O. D. Naidu ◽  
Sinisa Zubic ◽  
Patrick Cost

Author(s):  
Ronaldo F. R. Pereira ◽  
Felipe P. Albuquerque ◽  
Luisa H. B. Liboni ◽  
Eduardo C. M. Costa ◽  
Mauricio C. de Oliveira

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