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.

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.

A Research on Transmission Line Power Frequency Parameter Measurement

2013 ◽  
Vol 411-414 ◽  
pp. 1680-1683
Author(s):  
Qing Min Gao ◽  
Lei Gao ◽  
Ya Fang Wu
Keyword(s):  
Power System ◽  
Transmission Line ◽  
Frequency Parameter ◽  
Electric Power System ◽  
Practical Engineering ◽  
Power Frequency ◽  
Feasible Solutions ◽  
Switching Equipment ◽  
Important Significance ◽  
Selection Of

This paper aims at various problems encountered in the current power-frequency parameter measurements, analyzed the feasible solutions which not only effectively improved the accuracy of surveying data, but also provided necessary and accurate data for transmission line parameters for the calculation of stability of power system and relay protection setting, and a reliable theoretical basis for the calculation of electric power system and correct setting and selection of various switching equipment. It has been proved through practical engineering verification that, power-frequency parameter measurements has very important significance in improving the safe operation of the power system.

Study on the "Phase Hopping" AC-AC Frequency Conversion Method with Approximately Continuous Frequencies

2020 ◽  
Vol 13 (8) ◽  
pp. 1217-1226
Author(s):  
Zhengwang Xu ◽  
Guozhuang Jiang ◽  
Ke Kun ◽  
Yuchun Yi
Keyword(s):  
Output Voltage ◽  
Frequency Conversion ◽  
Frequency Control ◽  
Actual Application ◽  
Power Frequency ◽  
Voltage Frequency ◽  
The Law ◽  
Large Cycle ◽  
Selection Of ◽  
Conversion Technology

Background: The output voltage frequency for the previously proposed "phase hopping" AC-AC frequency conversion technology is determined by the law that the number of output voltage cycles is reduced by one relative to the power frequency in a large cycle containing six jumps. According to the law, only a limited number of output frequencies, such as 37.5 Hz, 42.86 Hz and 45 Hz are found. Due to the large spacing between the output frequencies, the "phase hopping" frequency conversion technology is difficult to put into practical use. Methods: In this paper, the law of the output frequency control is generalized so that the number of output cycles in a large cycle is reduced by n relative to the power frequency. The analysis shows that the appropriate selection of large cycles, including the number of power frequency cycles and the value of n, can find more frequencies to be used. Reducing the interval between the output frequencies within 1Hz. Results: The analysis results were verified in simulation by MATLAB, and the harmonics and the feasibility of the actual application were analyzed. Conclusion: Finally, an experimental platform was built and an experimental analysis was carried out. The experimental results show that the theoretical and simulation analyses are correct.

scholarly journals Effect of Earthing Enhancing Compound (EEC) on Improving Tower Footing Resistance of a 500 kV Tower in a Rocky Area

2021 ◽  
Vol 11 (12) ◽  
pp. 5623
Author(s):  
Nur Alia Farina Mohd Nasir ◽  
Mohd Zainal Abidin Ab Kadir ◽  
Miszaina Osman ◽  
Muhamad Safwan Abd Rahman ◽  
Ungku Anisa Ungku Amirulddin ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Comparative Analysis ◽  
Transmission Line ◽  
Structure Analysis ◽  
Current Distribution ◽  
Soil Profile ◽  
Soil Structure ◽  
Soil Resistivity ◽  
Transmission Towers ◽  
Rocky Soil

This paper presents a comparative analysis of different earthing designs’ performances, with particular interest on the use of earthing enhancing compound (EEC) for a selected earthing design of 500 kV transmission towers in a rocky soil, using the SESCAD tool of the Current distribution, electromagnetic field grounding and soil structure analysis (CDEGS) software. The simulation included the interpretation of soil profile and comparison between designs A, B and C, which are currently used for the 500 kV tower footing resistance (TFR) improvement. Results showed each design had reduced the TFR by 66%, 54.7% and 63.2% for the towers T42, T48 and T50, respectively. In some cases, further improvement of TFR is required, especially in the rocky area where the soil resistivity (SR) value is of more than 500 Ω⋅m. In this case, EEC was used in Design C, encasing both the vertical and horizontal electrodes, and it reduced the TFR further by 16% to 20%. The characteristics of the soil and earthing arrangement design play an important role in achieving a low TFR value, which is directly proportional to the backflashover occurrence and thus to the transmission line performance.

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.

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