Impact of Climatic Factors on Electricity Losses on Aerial Power Lines

2021 ◽  
pp. 29-34
Author(s):  
Muhayo Islomovna Toshkhodzhaeva ◽  
Elena Ivanovna Gracheva ◽  
Shakhboz Tolibjonovich Dadabaev ◽  
Umeda Bobojonovna Odirmatova
Keyword(s):  
Climatic Factors ◽  
Power Lines

scholarly journals Analysis of the Torsional Stability of Split Phases

2019 ◽  
Vol 62 (6) ◽  
pp. 503-513
Author(s):  
I. I. Sergey ◽  
Y. G. Panamarenka ◽  
Y. V. Potachits ◽  
N. A. Yudina
Keyword(s):  
High Voltage ◽  
Climatic Factors ◽  
Short Circuit ◽  
Low Frequency ◽  
Power Lines ◽  
Structural Elements ◽  
Stability Calculation ◽  
Overhead Lines ◽  
Torsional Stability ◽  
Overhead Power Lines

The specificity of overhead power lines is associated with the fact that the length of conductors between the supporting structures can reach tens of thousands of meters. Wires and their components are exposed to climatic factors, viz. wind, rain, ice, snow. As compared to other structural elements, conductors are of the highest flexibility and lowest rigidity, and, therefore, they are the most sensitive elements to these effects. Since the early fifties of the XX century, the increase in energy consumption has caused the construction of high and ultra-high voltage overhead lines with split phases. For these types of conductors, new forms of oscillations have been noticed in the areas between the struts, the essence of which is torqueing the split phase. As a result, there is a violation of the torsional stability of the phase: collision of wires in the middle of sub-span and friction of wires of stranded conductor against each other, which leads to damaging conductors and, as a consequence, to disruption of power supply to consumers. Almost any overhead lines may be subjected to oscillations of wires in the span under the influence of wind. One of the types of such mechanical oscillations is galloping, i. e. low-frequency oscillations of wires with an amplitude reaching the value of the boom of wire sagging, and, taking into account the possibility of elongation of the wire, even exceeding it. Fluctuations in the galloping can cause significant mechanical forces and last long enough to lead to the destruction of structural elements of power lines, viz. wires, insulators, fittings and even pillars. Due to the large amplitude of oscillations, conductors of neighboring phases can approach each other at an unacceptable distance, resulting in a short circuit. The boundary value problem of the torsional stability calculation of the split phase with a given multiplicity of splitting has been set and solved. The critical lengths of the sub-spans at which the stable violation of torsional stability is most likely have been determined. A computer program has been developed, which can be used in the design of high-voltage lines with split phase.

scholarly journals Feasibility study on the use of oil-well tubing in construction of intermediate support for 6-10 kV high voltage overhead power lines in the development of oilfields

2019 ◽  
Vol 124 ◽  
pp. 05042
Author(s):  
A.N. Korkishko ◽  
O.A. Korkishko ◽  
A.A. Kosov
Keyword(s):  
Climatic Factors ◽  
Economic Feasibility ◽  
Power Lines ◽  
Oil Well ◽  
Overhead Lines ◽  
Intermediate Support ◽  
Technical Possibility ◽  
Overhead Power Lines ◽  
Office Software ◽  
The Impact

This article is devoted to assessing the technical effectiveness and economic feasibility of oilwell tubing in construction of intermediate supports for overhead power lines (6–10 kV) in the development of oil, gas and condensate field in the conditions of Far North. The article considers the technical possibility and economic feasibility of using the built-up cross section of the intermediate support of overhead lines consisting of two tubes welded together. The SCAD office software was used to calculate the strength of the proposed section for the design load, taking into account the impact of climatic factors. A comparative analysis of the construction cost was performed for 1 km of overhead power lines made of conventional materials and oil-well tubing. The calculations showed the feasibility of using this material for the construction of 6-10 kV overhead lines.

scholarly journals Development of a method for determining the location of a single line-to-ground fault of an overhead power line with voltage of 6(10) kV considering climatic factors

2019 ◽  
Vol 124 ◽  
pp. 05003
Author(s):  
Sergey Sidorov ◽  
Valery Sushkov ◽  
Ilya Sukhachev
Keyword(s):  
Climatic Factors ◽  
Distribution Networks ◽  
Power Line ◽  
Power Lines ◽  
Single Line ◽  
Methodological Error ◽  
Oil Well ◽  
Matlab Simulink ◽  
Ground Fault ◽  
Overhead Power Line

One of the main causes of the high accidents and outages rate in 6(10)-kV distributed power supply systems of oil well clusters is damage to overhead power lines due to single line-to-ground faults. Widely conducted studies to locate a single line-to-ground fault have established a correlation between the accuracy of determination and a large number of changing factors, such as operating mode parameters, overhead power line parameters, type of damage, transition resistance, soil resistance, and others. Rationing of technical means for determining the location of a single line-to-ground fault by instrumental errors without taking into account the methodological component translates into the error in locating the damage up to 30%. Thus, relevant research is aimed at determining the primary parameters of power lines and minimizing the methodological error in determining the location of damaged power lines, considering climatic factors. The study takes into account the basic physical processes of propagation of an electromagnetic wave in the power line. The main principles of the theory of electrical circuits and the electromagnetic field and MATLAB Simulink package algorithms are used. As part of the study, a technique has been developed that allows determining the distance from 6(10)/0.4-kV substations to a single line-to-ground fault location in distribution networks of oil well clusters taking into account climatic factors. A simulation model of a 10-kV distribution network supplying oil well clusters was developed in MATLAB Simulink, taking into account the dependence of the primary power line parameters on climatic factors and soil resistivity.

scholarly journals Development of an intelligent remote relay protection system with adaptive algorithms for determining the response setpoints

2020 ◽  
Vol 220 ◽  
pp. 01095
Author(s):  
Olga Akhmedova ◽  
Anatoly Soshinov
Keyword(s):  
Transmission Lines ◽  
Power Transmission ◽  
Climatic Factors ◽  
Functional Dependence ◽  
Dead Zone ◽  
Relay Protection ◽  
Power Lines ◽  
Electrical Networks ◽  
Emergency Situations ◽  
The Impact

The severe consequences of emergency situations force us to look for ways to increase the stability of the complex, through the development of new algorithms for determining the setpoints for triggering protection and determining the locations of damage on overhead power lines (OPL). In electrical networks, devices for determining fault locations on power lines of 10 kV and higher, based on measuring the parameters of the emergency mode, are widely used. When determining the location of the damage, not only the current and voltage parameters at the time of the accident are analyzed, but also the parameters of the overhead power line. OPL is characterized by the following main parameters: the specific active resistance R, the specific reactive resistance X, the specific active conductivity G and the specific reactive conductivity B. As a rule, these parameters are attributed to the unit of the length of the overhead line (OL) and take linear values in the calculations. When analyzing power transmission lines, tabular approximate values of the longitudinal and transverse parameters in the substitution schemes are used, although solving problems in an unsophisticated form leads to significant refinements of the known solutions, since the overhead lines are affected by external atmospheric factors (changes in ambient temperature, soil humidity, wind forces, ice formation, etc.). In this paper we analyze the characteristics of these variables and evaluate the impact of the above factors on the linear longitudinal and transverse AL parameters obtained functional dependence of the influence of external factors on the setpoint triggering distance protection, developed a methodology to automatically adjust a setpoint of the complex intellectual and adaptive protection algorithm for relay protection, taking into account changes in climatic factors to reduce the length of the “dead zone” and increase the sensitivity of the protection. Also, the use of empirical data on the line parameters obtained from sensors in the calculations will allow us to more accurately determine the location of damage based on the use of remote methods.

EPIDEMIOLOGY, ECOLOGY AND PREVALENCE OF SOIL TRANSMITTED HELMINTHS FROM KOSHI REGION OF NORTH BIHAR.

2018 ◽  
Vol 24 (1) ◽  
Author(s):  
LAKSHMI CHOUDHARY ◽  
PRABHAWATI PRABHAWATI
Keyword(s):  
Relative Humidity ◽  
Ascaris Lumbricoides ◽  
Rainy Season ◽  
Climatic Factors ◽  
Trichuris Trichiura ◽  
Hookworm Infection ◽  
Soil Transmitted Helminths ◽  
High Incidence ◽  
Apparently Healthy

Prevalence of soil transmitted helminthes infections in apparently healthy school going children and other 528 people of different districts of Koshi regions of North Bihar were evaluated. Over all incidences of STHs infection was 39.39% during study. High incidence of STH was seen in the rainy season i.e., in the month of July and August, September, significantly higher (P<0.05) .The incidence of Ascaris lumbricoides was highest in the month of August (18.64%). The month of September was 15.25% followed by that of July (14.4%) and October with 10.16%. Also the incidence of hookworm registered the highest incidence in the month of June (19.27%) and lowest in the month of December (4.82%) during the study period. However prevalence of Trichuris trichiura was negligible and it was almost nil in the most of the months but was highest in month of September with 28.57% and lowest in October with 14.00% The climatic factors are responsible for soil transmitted helminthes which are temperature, rainfall and relative humidity. Ascariasis, Trichuriasis and Ancyclostomiasis (Hookworm infection) are found to be endemic in this region.

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