I did not understand comparison that I attached so that please I want you to exp

Question

I did not understand comparison that I attached so that please I want you to explain the Comparison between Insulators in AC voltage by looking to table 2 and figure 6,. please explain it in clear words to let me understand it very well. Also, I want to know the meaning of Std. Deviation and its numbers for each insulator.

A. Comparison between Insulators in AC voltage Table 2 gives the AC flashover voltage of the three types of insulators Table 2: Results for the AC case Average [Peak-kV] 130 106 145 Std. Deviation Insulator1 Insulator 2 Insulator3 It appears that although insulator 2 only has half the arcing distance of insulator 1, it has a flashover voltage 18 percent less. Thus the flashover voltage is not directly proportional to arcing distance Figure 6 clearly indicates that the arcing distance cannot be the only parameter. Insulator 1 has a longer arcing distance than insulator 3 but a lower flashover voltage insulator 1 : .. 140 insulator 3 ? 120 insulator 2 200 250 300 350 Arcing Distance[mm] Fig. 6. Plot of the flashover voltage versus the arcing distance. The comparison between the peak values of AC flashover (Table 2) and the values expected according to the streamer model (Table 1) are similar, with an average error of 15 % The empirical formulas present a lower accuracy and are only valid for very specific geometries

Explanation / Answer

It was a mistake from my side while uploading . apologies!!!

Table 2 talks about the peak voltages and their standard deviations. The standard deviation for any device are specified as the work in that boundary values that is

Insulator 1 which has a average peak kv of 130 has standard deviation of 1 it means it can withstand 129 peak kv to 131 peak kv .it would not rupture to those deviation or fluctuation.

It is the design perspective or designer choice to quote that standard deviation on name plate of insulator. Standard deviation of 3 means u just add 3 more average (peak kv) and it can withstand that amount of potential during working conditions.these standard deviation numbers are not fixed the differ with the different manufacturer who design them.

Coming fig 6 .

It's just a plot of average (peak kv ) versus arcing distance flash over voltages with standard deviation are calculated from table 2 and used on graph versus arcing distance .arcing distances are being compared here!

And the conclusion is drawn that flash over does not depend on arcing distances

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