Corrosion diagnosis and early-warning method and system of substation grounding network

Abstract

The invention relates to a corrosion diagnosis and early-warning method and system of a substation grounding network. The method comprises the steps of building magnetic induction intensity of the grounding network to determine a grounding network structure; injecting a pilot-frequency sine excitation current to the grounding network, and acquiring data by a wireless electromagnetic signal acquisition device; building a diagnosis model by a process according to a probability density comparison method by combining the measured and acquired data of the grounding network structure; and automatically identifying a corrosion fault of the grounding network by a terminal processor and performing early warning. The system comprises a grounding network structure detection module, the wireless electromagnetic signal acquisition device and the terminal processor, wherein the grounding network structure detection module is used for determining the grounding network structure, the wireless electromagnetic signal acquisition device is used for acquiring an electromagnetic induction signal sequence, and the terminal processor is used for building the corrosion diagnosis model and judging a corrosion state of the grounding network to be detected. By the method, the requirement of detection diagnosis of a large-scale substation grounding network without evacuation can be solved, and the diagnosis method which can be used for more accurately and more timely judging an expansion fault of the grounding network without forecasting the grounding network structure and early warning is performed in advance is proposed.

Description

technical field [0001] The invention relates to the diagnosis and early warning of the corrosion state trend of the grounding grid, in particular to a method and system for diagnosing and early warning of the corrosion of the grounding grid of a substation. Background technique [0002] Substation grounding grid status monitoring is an important measure to maintain the safe and reliable operation of the power system and ensure the safety of personnel. Ground impedance, continuity and corrosive excavation detection are the three basic inspection items. Corrosion is an important reason for the poor performance and reliability of the grounding grid. The operation and management of the grounding grid made of steel has become an important content of substation equipment in my country. For corrosion inspection, point-selection excavation is more intuitive, but because the grounding grid is buried deep underground, it is difficult to accurately dig out the horizontal grounding bod...

AI Technical Summary

Problems solved by technology

However, at present, due to reasons such as cost and measurement complexity, the detection of substation grounding grids generally adopts the method of regular detection, which is difficult to reflect the status of the grounding grid in time, and it is impossible to give early warning of the corrosion trend of the grounding grid

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