Grounding corrosion detection method for overhead line structure

Abstract

The invention discloses a grounding corrosion detection method for an overhead line structure. The method comprises the following steps: unfastening a down conductor of a target tower; injecting an impact current into a ground electrode; collecting voltage and current waveforms of the ground electrode and calculating the change waveform of an impact ground resistor along with time change; analyzing and extracting the maximum value points from the change waveforms of the impact ground resistor along with time change to calculate corrosion or defect point positions x; judging that corrosion happens to the down conductor of the target tower when the corrosion or defect point positions x are smaller than the length of the down conductor of the target tower; otherwise, judging that corrosion happens to a prolonged grounding body of the target tower, and further determining the quantity and corrosion degrees of the corrosion points of the target tower when the target tower has a plurality ofprolonged grounding bodies. The method achieves corrosion detection on the grounding bodies of the tower based on a damaged line traveling wave refraction and reflection principle without excavation,and has the advantages of being high in detection accuracy, convenient and rapid to detect and low in detection labor intensity.

Description

technical field [0001] The invention relates to electric power engineering technology, in particular to a method for detecting grounding corrosion of overhead line towers. Background technique [0002] Due to long-term operation, the tower grounding body may have defects such as corrosion or even fracture, resulting in poor grounding or loss of ground. However, since the grounding body of the tower is deeply buried in the ground, excavation and detection of the grounding body of the tower will endanger the tower on the one hand, and on the other hand, there is a problem of heavy workload. Therefore, how to realize the non-destructive testing for the tower grounding body has become a key technical problem to be solved urgently. Contents of the invention [0003] The technical problem to be solved by the present invention: Aiming at the above-mentioned problems of the prior art, a method for detecting grounding corrosion of overhead line towers is provided. The present inve...

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Problems solved by technology

[0002] The tower grounding body may have defects such as corrosion or even fracture due to long-term operation, resulting in poor grounding or ground loss

However, since the grounding body of the tower is deeply buried in the ground, excavation and detection of the grounding body of the tower will endanger the tower on the one hand, and there is also a problem of heavy workload on the other hand.

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