EARTH RESISTANCE MEASUREMENT APPARATUS AND METHOD BY CLAMP-ON TYPE CURRENT COMPARISON

摘要

A ground resistance measurement method by performing a clamp-on type current comparison process is provided to measure easily a ground resistance by using ground current applied to ground lines. A ground resistance measurement apparatus is installed in at least three or more common ground lines in order to measure ground resistances. The ground resistance measurement apparatus includes a core(30), a first and second coils(31,32), a switch(40), and a current meter(45). The core is connected to each of the ground lines. The coils are wound around each core. The switch is installed at each core in order to switch the power to be applied to each coil. The current meter is connected serially to each coil in order to detect the current to be applied to each of the ground lines.