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Study on the Impact of Buildings on the Power-frequency Electromagnetic Field of 110kV Transmission Line

Author: LiuYueDing
Tutor: WangLiAo
School: Chongqing University
Course: Environmental Engineering
Keywords: transmission lines buildings power-frequency electric field magnetic induction intensity
CLC: TM723
Type: Master's thesis
Year: 2009
Downloads: 212
Quote: 1
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Abstract


As the increase adapting to the consumption of city power in our country, especially the 110 kV transmission lines, are adjacent to the residential district. The condition that the high-tension transmission lines cutting through city appears repeatedly. The impact on human health and living environment which the electromagnetic field produce arouses residents concern, as same as the people from all sectors of society. This essay mainly discuss the impact of buildings on 110 kV high-tension transmission lines electromagnetic fields as well as the protection of 110 kV transmission lines in the residential district.This essay summarizes the calculation model of the electric field intensity which the high-tension transmission line produces. In view of the short comings of algorithm above, this essay put forward the model that buildings besides overhanging curve, and process according to the characteristic of three-dimensional electric field in the process of algorithmic design. By this model derives the distribution of three-dimensional labor frequency electric-field when there is a building in vicinity. The article makes use of MATLAB to emulate actual 110 kV circuits and simulate the distribution the labor frequency electromagnetic field when there is a building nearby.It will be seen from this that the building have an effect of screening the labor frequency electric field around the ground, but the field intensity above the building such as the roof which the residents may touch would be more stronger than the ground; There would appear distortion of field intensity at the angle of building. But in the distance of 0.1 m from the building, the electric field intensity would reduces gradually while the distance between the transmission line and the building increase gradually from 5 ms .When the distance increases to 40 ms, the attenuation of disturbing the field intensity tends to slow. At the same time it could be seen that the electric field strength reach its Maximum value at the distance equal to the height of power transmission line, while the field intensity above the transmission line attenuates quickly than the below.At the same time, 110 kV transmission lines produces a magnetic field. Since the building does not have the effect of screening the magnetic field ,this essay builds up two dimensional model to calculate and simulate the electromagnetic induction intensity to indicate the gap the limiting value between Power-frequency Magnetic Field Immunity and standard.In the actual measurement of electromagnetic fields of 110 kV transmission lines, by chose of the single circuit transmission line and the double circuit transmission line in an open territory and buildings nearby to decide monitoring line. Selecting the longitudinal distribution of electromagnetic field to monitor where 1.5ms around buildings and at a distance of 0.1m from buildings. The actual result does not exceed the current standard in our country, and bring into correspondence with the predicting results. Meanwhile, the measurement results of electromagnetic field indoors and outdoors indicate that the construction of building have an attenuation effect on power-frequency electric fields. There into, the attenuation of power-frequency electric fields is bigger while the electromagnetic induction intensity is smaller.Besides, this essay puts forward a request of protecting distance in view of the difference of 110 kV transmission line electromagnetic field and the feature of distance attenuation. It can reach the request of protecting distance when 110 kV transmission lines stride over vicinity area of the residential district raise to 12ms high or the sideline projection keep 6ms away from the residential district.

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Transmission and distribution technology > EHV transmission
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