State Grid Corporation of China

State Grid Chongqing Electric Power Co. Electric Power Research Institute

Minghui Bao

Wei Chen

Xingzhe Hou

Qian Wang

Yongliang Ji

Gaolin Wu

Shiyu Tang

Jin Fu

A grounding grid breakpoint diagnostic method for a transient electromagnetic method, based on a transient electromagnetic detection apparatus. The method comprises: () disposing a test line at a position above a grounding grid to be diagnosed on the ground, and determining coordinates of a detection point; () obtaining information about coordinates of the detection point, and coinciding the center of the transient electromagnetic detection apparatus with the coordinates of the detection point; () performing, by the transient electromagnetic detection apparatus, measurement along the test line point by point, so as to obtain measurement data; () processing, by using diagram forming software, the measurement data to form a longitudinal resistivity cross-section diagram of the detection point according to a preset formula; () determining whether a breakpoint occurs at the detection point according to the longitudinal resistivity cross-section diagram. The method does not depend on a design material of a grounding grid, and can implement non-excavation grounding grid breakpoint diagnosis without outage, thereby reducing economic losses in a diagnosis process.

Grounding grid breakpoint diagnostic method for transient electromagnetic method

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Chongqing, China

Minghui Bao