scholarly journals Soil - Water Loss and Measures Measure composition of Overhead Power Transmission Lines in Hilly area

2021 ◽  
Vol 233 ◽  
pp. 01034
Author(s):  
YANG Chunxia ◽  
CHEN Xiaofeng ◽  
LI Li ◽  
Chen Xi ◽  
HU Jia ◽  
...  
Keyword(s):  
Soil Erosion ◽  
Transmission Lines ◽  
Water Conservation ◽  
Soil Conservation ◽  
Power Transmission ◽  
Power Transmission Lines ◽  
Long Distance ◽  
Conservation Measures ◽  
Water And Soil Conservation ◽  
Soil Conservation Measures

The disturbance characteristics of power transmission line projects are long distance, scattered disturbances, large differences in natural conditions, and diverse types and strengths of soil erosion. These two points are the key to soil and water conservation, Including that identifying the main controlling factors of soil erosion in each construction disturbance area, and adapting measures to local conditions, and setting up water and soil conservation measures for disasters are power transmission lines in hilly areas. This paper took a specific project as an example, analyzed and evaluated the characteristics of water and soil erosion in the project and optimizes the configuration of measures, in order to provide a reference for the arrangement of water and soil conservation measures in the construction of similar projects.

scholarly journals Ecological Restoration Modes of Soil and Water Conservation on the Mining Wasteland in Northern Grassland

2020 ◽  
Vol 194 ◽  
pp. 04008
Author(s):  
Rong Hao ◽  
Shan Dan ◽  
He Jingli
Keyword(s):  
Soil Erosion ◽  
Ecological Restoration ◽  
Water Conservation ◽  
Soil Conservation ◽  
Soil And Water Conservation ◽  
Plant Coverage ◽  
The Cost ◽  
Natural Climate ◽  
Soil Conservation Measures ◽  
Soil And Water

Taking the mining wasteland formed in Xilinguole grassland as the research object, the ecological restoration mode of the soil and water conservation on mining wasteland was studied in the grassland. A test of water and soil conservation measures was conducted according to the characteristics of soil erosion, natural climate and etc., with the purpose of quickly restoring the damaged vegetation in mining wasteland and reducing soil erosion. The results showed four ecological restoration modes were used for the restoration on the mining wasteland, including “shrub”, “shrub + grass”, “ecological bag + grass” and “sand barriers + grass”. Two ecological restoration modes which was “shrub + grass” and “sand barriers + grass”, made the plant coverage reach more than 60%, the amount of wind erosion was less than 8.0 t/hm2, the amount of water erosion was less than 3900 t/km2•a, the effect of soil and water conservation and ecological restoration was better, and the cost of economic input was lower.

scholarly journals The Effect of Soil Conservation Measures on Runoff, Soil Erosion, TN, and TP Losses Based on Experimental Runoff Plots in Northern China

Water ◽  
2021 ◽  
Vol 13 (17) ◽  
pp. 2334
Author(s):  
Haiyan Fang
Keyword(s):  
Soil Erosion ◽  
Soil Conservation ◽  
Soil Loss ◽  
Northern China ◽  
Nutrient Losses ◽  
Study Region ◽  
Conservation Measures ◽  
The Impact ◽  
Soil Conservation Measures ◽  
Runoff Plots

Total nitrogen (TN) and total phosphorous (TP) are the main pollutants affecting the water quality of the Miyun Reservoir, Beijing. However, few studies have been conducted on their responses to implemented soil conservation measures at a slope scale in northern China. To explore the impact of soil conservation measures on TN and TP losses, field monitored data from 18 runoff plots under natural rainfalls were used to analyze the changing characteristics of runoff, soil loss, and nutrient losses during 2014–2019. The results indicated that runoff, soil erosion, as well a TN and TP losses from the plots varied significantly, depending on land use and soil conservation measures. Bare plots suffered the highest soil, TN, and TP losses, followed by cultivated plots without soil conservation measures, cultivated plots with contour tillage, and other plots. Event-averaged runoff and soil loss rates ranged from 0 to 7.9 mm and from 0 to 444.4 t km−2 yr−1, and event-averaged TN and TP losses from cultivated plots were the highest, with values of 39.8 and 3.0 kg km−2, respectively. Bare and cultivated plots were the main sediment and nutrient sources. Among the cultivated plots, the terraced plot had the lowest soil and nutrient losses. The vegetated plots had insignificantly lower soil and nutrient losses. Most TN and TP were lost in particulate status from the plots, especially from the plots with soil conservation measures. Soil conservation measures can effectively prevent TN and TP losses. To guarantee water resource use, contour tillage is preferred for the bare and cultivated lands in the study region.

scholarly journals Corona Loss Minimization on High Voltage Transmission Line Network using Bundled Conductors.

2020 ◽  
Vol 9 (3) ◽  
pp. 887-891
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Power Transmission ◽  
Hessian Matrix ◽  
Electrical Power ◽  
Power Transmission Lines ◽  
Long Distance ◽  
Power Stations ◽  
Line Network ◽  
Corona Losses

Electrical power generated and transmitted at a long distance away from the power stations is usually affected by inherent transmission line losses. The Ohmic and Corona losses which are predominantly common in power transmission lines are considered in this paper. These two losses are mathematically modeled with and without embedded bundled conductors. The resultant model which is a non-linear multivariable unconstrained optimized equation is minimized using the Hessian matrix determinant method for stability test purposes. The results obtained show that corona losses are minimized with embedded bundled conductors at a very low current value with large spacing distance between the bundled conductors. The decrease in the corona loss which is a consequence of spacing adjustment of the 2, 3, and 4 strands of bundled conductors was plotted using MATLAB 7.14. The plots obtained are in conformity with the inverse relation between corona loss and conductor spacing.

scholarly journals The Effects of the Reverse Current Caused by the Series Compensation on the Current Differential Protection

2014 ◽  
Vol 2014 ◽  
pp. 1-6
Author(s):  
Cui Tang ◽  
Xianggen Yin ◽  
Xuanwei Qi ◽  
Zhe Zhang ◽  
Minghao Wen
Keyword(s):  
Transmission Lines ◽  
Power Transmission ◽  
Operation Mode ◽  
Reverse Current ◽  
Engineering Practice ◽  
Differential Protection ◽  
Power Transmission Lines ◽  
Long Distance ◽  
Series Compensation ◽  
Current Differential Protection

The series capacitor compensation is one of the key technologies in the EHV and UHV long distance power transmission lines. This paper analyzes the operation characteristics of the main protection combined with the engineering practice when the transmission line overcompensation due to the series compensation system is modified and analyzes the influence of the transition resistance and the system operation mode on the current differential protection. According to the simulation results, it presents countermeasure on improving the sensitivity of differential current protection.

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