GROUNDING GRID BREAKPOINT DIAGNOSTIC METHOD FOR TRANSIENT ELECTROMAGNETIC METHOD

摘要

A grounding grid breakpoint diagnostic method for a transient electromagnetic method, based on a transient electromagnetic detection apparatus. The method comprises: (101) disposing a test line at a position above a grounding grid to be diagnosed on the ground, and determining coordinates of a detection point; (102) 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; (103) performing, by the transient electromagnetic detection apparatus, measurement along the test line point by point, so as to obtain measurement data; (104) 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; (105) 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.

主权项

1. A grounding grid breakpoint diagnostic method, based on a transient electromagnetic detection apparatus including a transmitting system and a receiving system, said transmitting system including a battery pack, a transmitter and a transmitting coil, said receiving system including a receiver and a receiving coil, wherein said transmitting coil has its two ends respectively connected to current output ends of said transmitter, said battery pack has its anode connected to a positive power supply terminal of said transmitter and its cathode connected to a negative power supply terminal of said transmitter, and said receiving coil has its two ends respectively connected to signal acquisition lines of said receiver, characterized in that 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; and determining whether a breakpoint occurs at the detection point according to the longitudinal resistivity cross-section diagram.