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Calculation method of fire point alarm distance for overhead transmission line mountain fire satellite monitoring
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A technology for overhead transmission lines and transmission lines, which is applied to fire alarms, forest fire alarms, alarms, etc., to achieve strong applicability
Active Publication Date: 2016-06-08
STATE GRID CORP OF CHINA +2
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[0004] The technical problem to be solved by the present invention is to overcome the limitations of existing technologies in application, and propose a method that is accurate in calculation, avoids calculation errors, is not affected by regional changes, and greatly improves the alarm calculation of existing satellite mountain fire monitoring systems. Calculation method of fire point alarm distance for mountain fire satellite monitoring of overhead transmission lines with high accuracy
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Embodiment 1
[0064] Calculate the warning distance of the fire point (119.01, 67.01) to the overhead transmission line.
[0065] (1) Calculate the spherical distance between the fire point and the surrounding overhead transmission line towers from the formula (1), and find the alarm tower closest to the fire point based on the distance a 1 , Its coordinates are (119.02, 67.01), the adjacent tower a on the same line as the alarm tower 2 The latitude and longitude coordinates are (119.02, 67.00), see figure 2 . The horizontal distance D from the fire point to the overhead transmission line 2 The calculation process is as follows:
[0066] First, convert the above three latitude and longitude coordinates into radians, namely:
[0067] (lon 0 , Lat 0 )=(2.077116343, 1.169545132);
[0068] (lon 1 , Lat 1 )=(2.077290876, 1.169545132);
[0069] (lon 2 , Lat 2 ) = (2.077290876, 1.169370599).
[0070] Substituting formulas (1)~(2) to calculate:
[0071] a=434.29;
[0072] b=1111.95;
[0073] c=1193.78;
[0074]...
Embodiment 2
[0080] Calculate the warning distance of the fire point (123.91, 68.35) to the overhead transmission line.
[0081] (1). Calculate the spherical distance between the fire point and the surrounding overhead transmission line towers from the formula (1), and find the alarm tower closest to the fire point based on the distance 1 , Its coordinates are (123.913, 68.351), the adjacent tower a on the same line as the alarm tower 2 The latitude and longitude coordinates are (123.911, 68.353), see image 3 . The horizontal distance D from the fire point to the overhead transmission line 2 The calculation process is as follows:
[0082] First, convert the above three latitude and longitude coordinates into radians, namely:
[0083] (lon 0 , Lat 0 )=(2.162637476,1.192932544);
[0084] (lon 1 , Lat 1 )=(2.162689836, 1.192949997);
[0085] (lon 2 , Lat 2 ) = (2.162654929, 1.192984904).
[0086] Substituting formulas (1)~(2) to calculate:
[0087] a=165.86;
[0088] b=237.04;
[0089] c=336.10;
[0090]...
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Abstract
The invention discloses an overhead power transmission line mountain fire satellite monitoring fire point alarming distance calculating method. The method includes: according to satellite monitoring fire point coordinates and coordinates of overhead power transmission line pole towers around, utilizing a calculating formula of spherical distance between two points on the earth to determine an alarming pole tower nearest to a fire point; calculating three sides of an arc-shaped triangle formed by the fire point, the alarming pole tower and an adjacent pole tower on a same line with the alarming pole tower, and accurately calculating horizontal distance between the fire point and a power transmission line according to a planimetry principle, wherein the horizontal distance is alarming distance; determining alarming level according to the alarming distance. The method has the advantages that calculating errors can be avoided, the method is free of influence of region changing, and accuracy in alarming calculation of existing satellite mountain fire monitoring systems is improved greatly.
Description
Technical field [0001] The invention belongs to the technical field of power system disaster prevention and mitigation, and specifically relates to a method for calculating the fire point warning distance of an overhead transmission line wildfire satellite monitoring fire point. Background technique [0002] Wildfires near overhead transmission lines pose a serious threat to the safe and stable operation of the power system. The rapid spread of wildfires has brought huge problems to the prevention and control of wildfires. The use of the transmission line wildfire satellite monitoring system can timely and accurately detect wildfires near the overhead transmission line, and raise an alarm before it spreads below the line, so as to take effective preventive measures in advance. When satellites detect wildfires, in addition to locating the fire, it is also necessary to calculate the distance from the fire to the overhead transmission line to determine the corresponding alarm level...
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