| 摘要 |
PURPOSE:To separately measure the earthing resistance of an individual steel tower without generating the error based on the exciting current of a transformer, by using a square wave AC power source as an apply power source and eliminating the transformer not positive to a pulse current from a circuit. CONSTITUTION:The earthing resistor RA of a resistor R1 and an earthing electrode A to be measured and the earthing resistor RB of a first auxiliary electrode B are connected to a square wave power source 4' in series. The output voltage of the resistor R1 is applied to an amplifier 5 and one terminal of the rheostat 6 in the secondary outlet side thereof is connected to an earthing electrode A to be measured. In this state, formula I is formed. Earthing resistance RA can be indirectly calculated from the formula by R2. By this mechanism, the first auxiliary electrode B and a second auxiliary electrode C can be brought to a capacitive electrode sufficient to be merely layed to the surface of the ground. Further, the earthing resistance of a individual steel tower can be measured separately.
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