The Analysis and Countermeasures for the Influencing Factors of Power Grid Engineering Electromagnetic Environment

2014 ◽  
Vol 986-987 ◽  
pp. 747-750
Author(s):  
You Quan Zhang ◽  
Fei Wang ◽  
Shao Can Wang ◽  
Qing Wang ◽  
Xiao Lei Zhang
Keyword(s):  
Electromagnetic Field ◽  
Environmental Impact ◽  
Theoretical Prediction ◽  
Influencing Factors ◽  
Power Transmission ◽  
Radio Interference ◽  
Engineering Analysis ◽  
Electromagnetic Environment ◽  
Power Frequency ◽  
Technical Measures

In light of the increasingly prominent environmental problems and disputes of the power transmission transformation engineering, analysis many of the environmental impact of 500 kV power transmission transformation engineering, introduce the related standards of electromagnetic environmental impact, focusing on the analogy analysis and theoretical prediction for the electromagnetic environment around typical 500 kV power transmission transformation engineering , analysis the condition of the power frequency electromagnetic field and radio interference which generated by power transmission transformation engineering effects on the environment. put forward the countermeasures and technical measures to solve and alleviate the problem of environment .

Research on Electromagnetic Environment of Transmission Line

2014 ◽  
Vol 1022 ◽  
pp. 165-168
Author(s):  
Pei Lin Li ◽  
Si Qi Lv ◽  
Tian Le Li
Keyword(s):  
Electromagnetic Field ◽  
Transmission Line ◽  
Environmental Protection ◽  
Transmission Lines ◽  
Calculation Method ◽  
Power Transmission ◽  
Social Awareness ◽  
Electromagnetic Environment ◽  
Power Frequency

With the increasing development of China's power transmission project and social awareness of environmental protection, the problem of electromagnetic environment of transmission line has been widely concerned. This paper studies the electromagnetic environment around the transmission lines, analyzes the calculation method of power frequency electromagnetic field and the measures to reduce the power frequency electromagnetic field.

Study on Selection Method of Analogy Line in High Voltage Transmission Project Environmental Impact Assessment

2012 ◽  
Vol 209-211 ◽  
pp. 1126-1130
Author(s):  
Lei Huang ◽  
Huang Xin Cheng ◽  
Mei Wang
Keyword(s):  
Electromagnetic Field ◽  
Transmission Line ◽  
Theoretical Calculation ◽  
Accurate Result ◽  
Selection Method ◽  
Radio Interference ◽  
Line Number ◽  
Section Area ◽  
Power Frequency ◽  
Selection Of

This article integrate the theoretical calculation of the power-frequency electromagnetic field intensity and radio interference intensity under transmission line, and analyze the factor which influence the value and distribution of the electromagnetic field, radio interference under transmission line, aiming to provide basis and reference for other environmental assessment of electromagnetism. The study shows that a reasonable selection of analog lines can get an accurate result as the theoretical calculation. Important factors of analog lines selection including: grade of voltage, current, height of line, location order of line, number of circuit, section area of line, number of bundle conductors.

New aspects of power grid facilities personnel workplaces electromagnetic environment

2020 ◽  
Vol 60 (9) ◽  
pp. 569-574
Author(s):  
Nina B. Rubtsova ◽  
Sergey Yu. Perov ◽  
Olga V. Belaya ◽  
Tatiana A. Konshina
Keyword(s):  
Transmission Lines ◽  
Power Transmission ◽  
Power Grid ◽  
Spectral Characteristics ◽  
Ground Level ◽  
Frequency Characteristics ◽  
Frequency Range ◽  
Electromagnetic Environment ◽  
Limit Values ◽  
Special Assessment

Introduction. Electromagnetic safety of power grid facilities staff requires the exclusion of electromagnetic fields (EMF) harmful effects. EMF is evaluated by 50 Hz electric and magnetic fields (EF and MF) values in the framework of working conditions special assessment, and very rarely the analysis of the electromagnetic environment (EME) is carried out in depth. The aim of the study - EME hygienic assessment of power grid EHV facilities personnel workplace with adequate 50 Hz EF and MF levels evaluation as well as the analysis of EF and MF in the frequency range from 5 Hz to 500 Hz amplitude-frequency characteristics. Materials and methods. 50 Hz EF and MF values assessment was carried out on open switchgears (S) of substations and within sanitary breaks of 500 and 750 kV overhead power transmission lines (OTL). Measurements along to OTL trasses was performed using matrix-based method. Measurements and analysis of EF and MF values in 5-500 Hz frequency range amplitude-frequency characteristics were performed in the territory of 500 and 750 kV S. Results. Power frequency 50 Hz measurements results at 500 and 750 kV S ground-level personnel workplaces showed the presence of an excess of permissible limit values by EF intensity and the absence of an excess by MF. The measured EF values within 500 and 750 kV OTL sanitary gaps require limiting the working time of linemen due to the excess of the hygienic norms for full work shift, while the MP levels were almost completely within the standard values for persons not occupationally connected with electrical installations maintenance. MF and EE frequency range from 50 Hz to 500 Hz spectral characteristics analysis showed that 3rd harmonic percentage does not exceed 2.5% for EF and 6% for MF of the main level, the level of the 5th harmonic does not exceed 1% for EF and 3.5% for MF, the level of the 7th harmonic does not exceed 0.2% for EF and 0.8% for MF. These data show despite its low levels the contribution of MF different harmonics in a possible adverse impact on humane than EF corresponding harmonics. Conclusions. There was the confirmation of the previously justified use of the "matrix" scheme for of EF and MF values measurement along OTL routes. The relevance of to EF and MF all frequency components expos ure assessing possible health risk in extremely high voltage S territories and under OTL, based on international recommendations due to the lack of sanitary regulations in the Russian Federation for >50 Hz-30 kHz EF and MF, is shown.

Impact of 750kV Transmission Line Series Compensation Capacity on Power Frequency Overvoltage

2014 ◽  
Vol 986-987 ◽  
pp. 330-333
Author(s):  
Ding Jun Wen ◽  
Xiu Bin Zhang ◽  
Hong Gang Chen ◽  
Feng Jiang ◽  
Ya Ming Sun
Keyword(s):  
Transmission Line ◽  
Single Phase ◽  
Power Transmission ◽  
Series Compensation ◽  
Two Phase ◽  
Transient Model ◽  
Power Frequency ◽  
Arc Current ◽  
Recovery Voltage ◽  
Insulation Coordination

The overvoltage calculation of 750kV transmission line with series compensation has great significance on the design, insulation coordination and protection of the line. In this paper, a transient model of 750kV power transmission system with series compensation is established. Effects of different capacity on no-load capacitive rise overvoltage, single-phase grounding overvoltage, two-phase grounding overvoltage are calculated. Secondary arc current and recovery voltage of different series compensation capacity in single-phase grounding is also calculated.

scholarly journals Development of the wave method of calculation operational parameters of a double-circuit power transmission line with known values of output voltages and currents at the end of the line

2019 ◽  
Vol 21 (3) ◽  
pp. 63-72
Author(s):  
G. A. Bolshanin ◽  
M. P. Plotnikov
Keyword(s):  
Electromagnetic Field ◽  
Transmission Line ◽  
Power Transmission ◽  
Accurate Determination ◽  
Electrical Energy ◽  
Necessary Condition ◽  
Power Transmission Line ◽  
Induced Voltage ◽  
Operational Parameters ◽  
Reflected Waves

Electrical energy from the place of its generation is transmitted to consumers of various capacities. The distance from the source of electrical energy to the consumer can vary from several meters to several thousand kilometers. In this regard, the accurate determination of the operating parameters of the power transmission line (PTL) is a mandatory and necessary condition for the PTL normal functioning. In the current-carrying parts of the double-circuit PTL there are six incident and six reflected waves of the electromagnetic field. They determine voltages and currents. A scheme is proposed for the distribution of these waves along linear wires of a homogeneous section of a double-circuit PTL. This scheme shows that the current-carrying parts of the adjacent wires have a significant impact on voltages and currents in one wire. This scheme illustrates the distribution of the amplitude values of electromagnetic field waves, defined as the integration constant. Using the integration constants, the propagation constants of electromagnetic waves along the linear wires of the PTL and the corresponding wave impedances, one can obtain the amplitude values of the incident and reflected waves at any point of the double- circuit PTL, and hence the currents and voltages in the double-circuit PTL. The article presents a method for determining the currents and voltages in a double-circuit PTL according to the load. The proposed method will allow determining the qualitative and quantitative indicators of electrical energy (induced voltage) appearing from each wire separately and provide the possibility of their elimination, which will improve the quality of electrical energy.

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