Method and system for evaluating corrosion state of transformer substation grounding grid

Abstract

The invention relates to a method and a system for evaluating a corrosion state of a transformer substation grounding grid. The system comprises a field impact current generation module, a transient current and voltage recording module of all grounding down leads, an impact grounding impedance calculating and impact response curve drawing module, a testing result storing and recording module and a grounding grid state evaluation and analysis module, wherein the field impact current generation module is used for generating impact current; the transient current and voltage recording module of all the grounding down leads is used for collecting the impact current, transient response voltage waveforms of input grounding down leads and impact response voltage waveforms of output grounding down leads in different positions; the impact grounding impedance calculating and impact response curve drawing module is used for processing current and voltage data to obtain the grounding grid impact impedance and an impact response curve of different positions; the grounding grid state evaluation and analysis module is used for evaluating the corrosion state of the transformer substation grounding grid. Compared with the prior art, the method and the system, disclosed by the invention, have the advantages of simplicity, accuracy and capacity of being not limited by a field running condition.

Description

technical field [0001] The invention relates to a technique for evaluating the corrosion state of a substation grounding grid, in particular to a method and system for evaluating the corrosion state of a substation grounding grid based on impact grounding impedance and response. Background technique [0002] Substation grounding grid is an important facility to ensure electrical equipment and personal safety. Because the grounding grid is buried underground, the grounding body is often thinned or even broken due to years of soil corrosion, which deteriorates the grounding performance of the grounding grid. At present, the detection of the grounding performance of the grounding grid in engineering is generally judged indirectly through the power frequency grounding resistance, but it is impossible to know the corrosion of the grounding grid. Because as long as the grounding body at the measurement point does not break, even if the grounding grid is severely corroded, the pow...

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Problems solved by technology

Therefore, only measuring the power frequency grounding impedance cannot represe

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