000			01784nab a2200205 4500
005			20260520000935.0
008			260224s2010 xxu
245	0	0	_aDevelopment of an electrochemical in situ detection sensor for grounding grid corrosion
260			_a _b _cjul. 2010
270			_a02/08/2010 ; 02/08/2010
300			_a7 p. ; 076001
520			_aTranscripción del resumen del autor. An electrochemical in situ detection sensor for grounding grid corrosion was developed. Because the auxiliary electrode used to polarize the working electrode was encapsulated into an insulation cavity (carbon steel), the polarization current was made to flow through the pinhole to the working electrode and the confinement function of the sensor was implemented. The potential-time curve (E-t curve) as a response to a galvanic step was measured with the sensor and the polarization resistance was obtained by E-t curve-fitting software. The impact of the sensor hole diameter and the insertion depth into the soil on the measurement area were studied by measuring the polarization resistances of the grounding grid. The investigation results show that the optimum sensor diameter is 5 mm, the insertion depth of the sensor has a small impact on the current confinement at a range of 12.5 cm, and the ratio of area measured with current confinement sensor to that measured with the traditional one is about 1/80. This sensor was successfully used to carry out corrosion detection for a substation grounding grid without excavating the grounding grid or stopping its operation.
581			_a7
773	0		_tCorrosion _g66
942			_cARTICULO
100	1		_aZhang, X.-L. _946109
100	1		_aZhao, X.-H. _941053
100	1		_aWang, Y.-G. _946110
999			_c175612 _d175612