Device and method for monitoring corrosion degree of excavation-free substation grounding net based on pressure change

Abstract

The invention provides a device and a method for monitoring a corrosion degree of an excavation-free substation grounding net based on pressure change. The device comprises at least one cylindrical structure, a pressure detection device and a breather pipe, wherein each cylindrical structure, the breather pipe and the pressure detection device are communicated insides and form a sealed space; the material of each cylindrical structure is the same as that of a to-be-monitored grounding net; each cylindrical structure is buried with the to-be-monitored grounding net under the ground simultaneously, a height of the cylindrical structure away from the ground is the same as that of the grounding net away from the ground, and the cylindrical structures are filled with preset noncorrosive gases; the pressure detection device is positioned above the ground for detecting a pressure value inside each cylindrical structure; when the difference between the current pressure value of one of the cylindrical structures and an initial pressure value exceeds a preset pressure difference, the to-be-monitored grounding net is judged to have the same corrosion degree as the cylindrical structure with the pressure difference. According to the device and method disclosed by the invention, the corrosion condition of the grounding net can be effectively monitored on premise of not excavating and sampling the grounding net.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to an excavation-free substation grounding grid corrosion degree monitoring device and method based on changes in air pressure. Background technique [0002] According to the requirements of China Southern Power Grid Co., Ltd. enterprise standard "Preventive Test Procedures for Electric Power Equipment (Q / CSG114002-2011)", the five provinces in southern my country conduct excavation and corrosion inspections on substation grounding grids in a 10-year cycle. Select 5-8 points at each station to excavate and inspect along the grounding down-conductor, use visual inspection, sampling to determine the corrosion rate and corrosion rate and other quantitative indicators to judge the corrosion of the substation grounding grid, if the corrosion rate is less than 10%, the corrosion degree is average ; If the corrosion rate is greater than or equal to 25%, the degree of corrosion is sev...

AI Technical Summary

Problems solved by technology

However, in the process of specific implementation, there are also some problems, such as: the excavation and sampling of the grounding grid will destroy the original structure of the substation; the local serious corrosion of the grounding grid in the substation may be missed; some substations do not meet the grounding requirements. The conditions for grid excavation or sampling; the timeliness of grasping the corrosion situation of the ground grid is limited

At present, there is no report on the test method for the corrosion degree of the excavation-free grounding grid

Images