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Method for calculating conversion coefficient between impulse grounding resistance and power frequency grounding resistance |
Wu Huabin, Wang Guangbo |
Yangjiang Meteorological Bureau of Guangdong,Yangjiang 529500 |
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Abstract Based on the principle of similar triangle,the calculation method of conversion coefficient (A) between impulse grounding resistance and power frequency grounding resistance is derived.Taking A-value,inflection point and included angle of adjacent known characteristic lines as reference points,the calculation steps and calculation formulas of three interpolation methods are derived by using linear interpolation theory.The results show that the inflection point method is the best,the A-value method is the second,and the included angle method is the worst,the interpolation results of (100,500] interval are not ideal.After the exploration and improvement of inflection point method,the interpolation effect in the (100,500] interval is greatly improved,and its accuracy can meet the requirements of business use.After programming it into a mobile phone app,it is more helpful for practical work.
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Received: 11 August 2020
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