METHOD TO DETERMINE COMPONENTS OF FULL RESISTANCE OF GROUNDING DEVICE Russian patent published in 2013 - IPC G01R27/00 

FIELD: measurement equipment.

SUBSTANCE: method to determine components of full resistance of a grounding device comprising an electric circuit, in which a DC source with the help of an electronic key is connected via a shunt with an investigated grounding device, and with the second inlet - with a remote current electrode, suggests measurement with the help of a memorising oscillograph of voltage drop on a shunt u₁(t) and difference of potentials u(t) between the point of current input into the grounding device and the remote potential electrode. At the same time using data of the produced oscillogram they determine instantaneous current value and potential in the circuit at the moment of ending of the linear growth area of the grounding device potential I₁, the set value of current I₂, the initial value of voltage U₀ and the set value of voltage U₂ between the grounding device and the potential electrode, spreading resistance R_{gd spr}, resistance of the grounding device Z_{gd full}, and resistance of the interface metal-soil Z_s are determined according to the following ratios: $$R_{gdspr}=\frac{\left|U_1-U_0\right|}{I_1},$$ $$Z_{gdfull}=\frac{\left|U_2-U_0\right|}{I_2},$$ Z_s=Z_{gd full}-Z_{gd spr}.

EFFECT: expansion of functional capabilities by control of grounding device resistance parameters.

3 dwg