GROUND RESISTANCE MEASUREMENT DEVICE, GROUND RESISTANCE MEASUREMENT METHOD, AND GROUND RESISTANCE MEASUREMENT PROGRAM

Japanese Patent JP2015045549

A

PROBLEM TO BE SOLVED: To measure the ground resistance value of a multiple-grounded ground resistance reliably in a short time while avoiding causing the amount of arithmetic operation to swell.SOLUTION: A ground resistance measurement device is provided with a processing unit in which a process for executing an initial value determination process for calculating a 1/4 value of a measured ground resistance value rof each grounding pole Pand making a minimum value among the calculated values to be an initial value, and also calculating a provisional synthetic resistance value Ra with respect to the measured ground resistance value rand a parallel synthetic resistance as a whole of grounding pole Pand a provisional ground resistance value Rtwith respect to each ground resistance value Rof each grounding pole Pon the basis of the formula below, and a process for calculating a parallel synthetic resistance value Rb as a whole of the grounding pole Pon the basis of the provisional ground resistance value Rtare repeated while altering the provisional synthetic resistance value Ra from the initial value on the basis of the sign of a difference value between the provisional synthetic resistance value Ra and the parallel synthetic resistance value Rb until the provisional synthetic resistance value Ra is converged, and the provisional ground resistance value Rtis thereby converged, the converged value of the provisional ground resistance value Rtbeing measured as each ground resistance value R. Rt=(r+√(r-4×r×Ra))/2.

JPS5819225

[Title of the Invention] Ground resistance measuring device

MIYATA YUSAKU

JP2013176265A

March 12, 2015

August 28, 2013

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HIOKI ELECTRIC WORKS

G01R27/20

Shinji Sakai

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