Application research of convolution neural network in image. Antiicing and deicing techniques for overhead lines. This study proposes a method to predict the remainingdangerous time rdt of the icing load accretion on an interval of the power transmission lines with modified hidden semimarkov model hsmm. The rms voltage at the anitnodes is about 100kv rms. Overhead transmission lines deicing under different incentive. Two parallel wires coaxial cable microstrip line optical fiber waveguide very high frequencies, very low loss, expensive etc. Transmission line design information in these notes, i would like to provide you with some background information on ac transmission lines. Abstractatmospheric icing may be problematic for many industries, including electric utilities. Icing of highvoltage overhead power lines can affect the safe operation of the power distribution grid due to the additional weight load of the accumulated ice layer.
Iec 60826 2003 design criteria of overhead transmission lines. Power transmission lines play a key role in a nations economy and peoples daily life. Mechanics analysis of overhead transmission lines based. Transmission lines a transmission line connects a generator to a load a two port network transmission lines include physical construction. Since power transmission lines are mostly overhead and could face direct impact of icing, and it is one of the main challenges faced by power distribution. Mechanics analysis of overhead transmission lines based online monitoring lili dai, yongli zhu, zehui liang school of electrical and electronic engineering, north china electric power university, baoding,china email. At present, there are many studies on icing forecasting for power transmission lines. The levis deicer is a high voltage direct current hvdc system, aimed at deicing multiple ac power lines in quebec, canada. Power loss and dispersion transmission lines may also be dispersive, which means the propagation velocity on the line is not constant with frequency for example the frequency components of square wave recall odd harmonics only each propagate at a different velocity, meaning the waveform becomes smeared. Mccurdy, jd 2003 using dielectric losses to deice power transmission lines with 100 khz highvoltage excitation. Design of transmission lines for atmospheric icing springerlink. Influence of icing to the corona loss characteristics of the.
Shortterm prediction for transmission lines icing based. However, transmission line icing is affected by a variety of factors, and a multiple linear regression model cannot take all factors into account, meaning the icing forecasting accuracy is greatly reduced. Numerical study of a droplet impact on cylindrical objects. Icing on power transmission lines is a serious threat to the security and stability of the power grid, and it is necessary to establish a forecasting model to make accurate predictions of icing thickness. Deicing ehv overhead transmission lines by shortcircuit. Mannvit offers comprehensive design, consulting and engineering services for all phases of electric power transmission and distribution including decades of experience in the design of overhead power lines and transmission towers. However, in many countries and regions, due to the geographical positions or meteorological conditions, the transmission lines always suffer the icing problem and huge loss has been caused. Image recognition of icing thickness on power transmission.
Scribd is the worlds largest social reading and publishing site. Field datadriven online prediction model for icing load. Icing will influence the corona characteristics of transmission lines. Consequently, we will discuss the state of the art and prospect of deicing of power transmission lines using mechanical devices, which is. Deicing is a process in which ice can removed from the iced wire. Icing effects on power lines and antiicing and deicing. Ice buildup on power lines, or icing, can be a common issue for utilities in cold or temperate regions, where storms can deposit thick layers of ice on power assets, including transmission lines, towers and shield wires. There are many types of ice that can form on transmission lines in the natural environment, including. With global abnormal weather occurring frequently in todays climate, icing disasters on power transmission lines are growing in frequency. The transmission line corridor will inevitably cross the icing area in china.
Study on icing prediction of power transmission lines. An analysis of the reliability of a new dataset of. Greg mowry annie sebastian marian mohamed school of engineering soe university of st thomas ust 1. Mechanics analysis of overhead transmission lines based on. Atmospheric icing of transmission line conductor bundles. Based on the predicted rdt of the cables during ice accretion. A distribution line may have fuses, transformers, voltage regulators, capacitors, reclosers, or any number of other devices attached to the power lines themselves. Given the characteristics of complexity, nonlinearity, and fitfulness in the line icing process, a model based on a multivariable time series is presented here to predict the icing load of a transmission line. Study on icing prediction of power transmission lines based. Under natural conditions, the thickness of ice coating on the transmission line shows a nonlinear growth trend and many influencing factors increase the difficulty of forecasting.
The introduction chapter 1 for these design data collection. Deicing ehv overhead transmission lines by shortcircuit currents power puissance this paper presents a new method for deicing ehv bundled conductor transmission lines following severe ice storms. At present, different design companies have different idea. Overhead transmission line icing refers to the phenomenon of freezing rain, rime, wet snow, and mixed icing on overhead transmission lines national meteorological bureau of china 1979. Icing detector for overhead power transmission lines. Icing detector for overhead power transmission lines ieee xplore. Millions of people were without power, some for weeks. It is the only hvdc system not used for power transmission. Excitation at approximately 33 kv 100 khz can be used melt ice off of power transmission lines through dielectric losses in the ice itself. The combination of wind and ice could cause damages. For transmission lines, icing hazard is one of the most common and serious hazards, posing a huge threat to the safety and stability of the lines 2.
Transmission lines in an ac power system, a tl will operate. The deicing of power lines by applying highfrequency high voltage. A field datadriven online icingload prediction model that provides predictionbased early warnings can guide the decisionmaking processes regarding the maintenance and deicing of power transformation and transmission systems, thus alleviating losses in power grids caused by the icing of transmission lines. Ice accumulation on transmission lines is one of the most serious threats to power grid safety kiessling et al. Since power transmission lines are mostly overhead and could face direct impact of icing, and it is one of the main challenges faced by power distribution companies in cold regions. In order to improve the forecasting accuracy with regard to icing thickness, this paper. Intelligent video technology is used to detect the icing condition of transmission lines in real time, and the vibration frequency range of transmission lines is analyzed and calculated. Ice accretion on power transmission lines is one of the major causes for cable failure in zhaotong area, yunnan province, south china. Research article overhead transmission lines deicing under different incentive displacement qinghe, 1 xifenglv, 1 andxiaotongzhao 2 school of energy power and mechanical engineering, north china electric power university, beijing, china. Icing on power lines may lead to compromise safety and reliability of electric supply network.
The earliest reports of icing accidents on power transmission lines appeared in 1932, and since then norway, canada, britain, russia, japan and other countries or regions have had serious icing disasters. Overhead transmission lines deicing under different. Request pdf icing detector for overhead power transmission lines this paper presents a capacitive measurement principle to detect the formation and. The method involves circulating shortcircuit current isc at the rated voltage of the transmission lines and the subsequent action of electromag. Detection of ice on wires of overhead transmission lines. Therefore, a hybrid model was proposed in this paper, which mixed ensemble empirical mode decomposition eemd. Icing forecasting for power transmission lines based on a. In order to deeply analyze the influence law of the icing to corona loss characteristics, an icing test platform that can be utilized to simulate icing conditions was built. This paper presents a new method for deicing ehv bundled con ductor transmission lines following severe ice storms. Multivariable time series prediction for the icing process. The design of monitoring and predictive alarm systems is necessary for successful overhead power transmission line icing. Us20160064912a1 antiicing coating for power transmission. Taking value research of check ice case in 15mm icing.
Hon tat hui transmission lines basic theories nusece ee2011 28 example 1 a 100. Aug 11, 2015 introduction when accretion of ice takes place over the conductor then icing occurs. Research article overhead transmission lines deicing under. However, few papers have focused on the state of the art of the deicing devices form the mechanical engineering point of view. This technique fell into disuse in the us during the last 50 years. Keywordsice, power system operation, power system reliability, power system security, power transmission lines, power. The system can be used to detect the icing of transmission lines in the deep forest which cannot be reached by walking. Icing of power transmission lines during winter storms is a persistent problem that causes outages and costs millions of dollars in repair expenses.
A careful risk analysis is needed to develop the right strategy. Deicing of transmission line free download as powerpoint presentation. Ice accumulation on transmission lines is one of the most serious threats to power grid safety kiessling et. Icing effects on power lines and antiicing and deicing methods. According to the hydrodynamic movement law and heat transfer mechanisms, domestic and foreign scholars have established a variety of transmission line icing forecasting models that consider meteorological factors, environmental factors, and various line. Application research of convolution neural network in. Most of the damage on overhead transmission lines was due to ice accumulation on conductors, causing towers to collapse figure 1. Combating ice deposits on overhead transmission lines has been a big challenge in cold climate regions for the last eighty years. Icing typically builds up in temperatures ranging from. The 1998 ice storm caused severe damage to hydroquebecs power transmission system. Introduction when accretion of ice takes place over the conductor then icing occurs. For example, it may cause the overload of transmission lines, the flashover of insulator, the noncontemporaneous deice and so on 16.
Pdf breaking the ice transmission line icing researchgate. Icing detector for overhead power transmission lines request pdf. Abstracticing of power transmission lines during winter storms is a persistent problem, causing outages and costing millions of dollars in repair expenses. Deicing of transmission line transmission line capacitor. The ice coating on the transmission line is extremely destructive to the safe operation of the power grid. Using dielectric losses to deice power transmission lines. Measurement and control field datadriven online prediction. Icing of power transmission lines during winter storms is a persistent problem, causing outages and costing millions of dollars in repair expenses. The research on power grid icing has wide application value. Pdf icing of power transmission lines during winter storms is a persistent problem that causes outages and costs millions of dollars in repair. Nowadays, transmission lines icing caused by ice disaster has become a common problem faced by.
Icing of power transmission lines during winter storms is a persistent problem, causing outages and costing millions of rupees in repair expenses. This paper proposed an excitation deicing method of iced wire and theoretically revealed the ice removal mechanism under displacement excitation conditions, by taking the lgj7010 glaze icing wire as the 3d model and analyzing and studying its dynamic response under the effect of. The reliability, maintainability, and safety of power facilities such as power stations and power grids are important for the security of national economies and the livelihoods of people. Influence of icing to the corona loss characteristics of. This manual, brought up to date periodically, describes the latest deicing techniques utilized in the aeronautical field. Us9206506b2 antiicing coating for power transmission lines. Transmission lines icing seriously affects the stability of power system. Ac transmission line impedance parameters ac transmission is done through 3phase systems. Major recent ice storms caused many downed lines and much loss of customer load. A cable may be fed through a container with a solgel material having a piezoelectric material to form an uncured layer on the surface of the cable. Deicing methods using techniques such as conductor heating or mechanical deicing using a roller are possible for overhead lines ranging from 25 to 245 kv. Multivariable time series prediction for the icing process on. Us9206506b2 antiicing coating for power transmission. Antiicing coating for power transmission lines download pdf info publication.
Overhead transmission line icing is one of the main factors affecting safety and reliability of power grid. Field datadriven online prediction model for icing load on. Power line towers design of transmission towers mannvit. Prolong icing can lead to power breakdown and collapse of towers. In combination with wind, this phenomenon can causes signi cant damage to electric power transmission networks. Hence, it is convenient to predict the thickness of line icing to carry out timely response to the damage caused by icing, so as to. Deicing ehv overhead transmission lines by shortcircuit currents. Icing and downed lines dashed in quebec, january 1998. Ensure adequate transmission from resources to serve loads in a reliable and economical manner.
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