METHOD OF MEASURING RESISTANCE OF EARTHING DEVICE OF DIRECT CURRENT RAILWAY SUBSTATION Russian patent published in 2012 - IPC G01R27/20 

FIELD: physics.

SUBSTANCE: in the method of measuring resistance of the earthing device of a direct current railway substation, the measuring current is part of the traction current flowing on the earthing device of the direct current railway substation, connected through a drainage apparatus to the negative terminal of the supply; the value of current through the earthing device is determined by dividing voltage across the shunt of the drainage apparatus by resistance of that shunt; the unknown resistance of the earthing device is calculated using the formula: where R_sh is the resistance of the shunt of the drainage apparatus. U_sh is the voltage across the shunt of the drainage apparatus, U_e is the voltage between the earthing device and a remote potential electrode carried to "the zero potential point".

EFFECT: considerable increase in measurement accuracy by increasing measuring current, reduced labour input and expenses on measuring since there is no need to use a portable generator, an ammeter, a current electrode and coils with long wires.

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