Measuring tools and methods
Measuring tools
Caliper, caliper, ruler, coordinate paper (Mig paper)
Measurement methods
Paste the coordinate paper on the surface of the insulator in the direction of the insulator leakage distance (crawling distance), and stick a strip in the symmetry direction of the paper. Set the length of each aliquot to 1cm, and mark the aliquot (1, 2, 3, 4, n) on the coordinate paper, and then measure the aliquot at a certain point with a caliper, caliper or other measuring tool. Diameter, adding these diameters and weighing them π gives the surface area of ​​the insulator.
1) Surface area of ​​a single round table
Calculation formula:
S1=(d1+d2)×△L/2
=πD1×△L
Where: S1 - the surface area of ​​the truncated cone;
D1+d2——the diameter of the upper and lower surfaces of the round table;
D1 - the average diameter of the round table;
â–³ L - the height of the side of the round table.
2) Surface area of ​​the entire insulator
Calculation formula:
S =S1+S2+...+Sn
=πD1×△L+πD2×△L+...+πDn×△L
=π(D1+D2+...+Dn)×△L
Approximate calculation formula
When the number n of the curve (crawling distance) is larger (ie, the smaller the ΔL), the calculated value of the surface area of ​​the insulator is closer to the actual value, and the diameter D1 at any point in the aliquot of the curve can be used. D2,...,Dn replaces the average diameter D1, D2,..., Dn of the truncated cone, that is, the circular table is approximated as a cylinder, so the approximate calculation formula of the surface area of ​​the insulator is:
S=π(D1+D2+...+Dn)×△L
Total surface area calculation
It can be seen from the above formula that the total surface area can be calculated by measuring the surface area of ​​the insulator by simply dividing it into n parts along the direction of the leak distance and measuring the diameter Dn of any point in each part. If the leakage distance of the insulator is divided by 1 cm, the total surface area is:
S=Ï€(D1+D2+...+Dn)
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