Substation grounding grid corrosion monitoring system

Abstract

The invention discloses a substation grounding grid corrosion monitoring system which includes a corrosion monitoring sensor and a corrosion monitoring device, wherein the corrosion monitoring sensor includes an auxiliary electrode, a guard ring electrode, a solid reference electrode, a stainless steel cylinder and a stainless steel casing; the corrosion monitoring device includes an MCU controller, a sine wave generator, a data acquisition unit, a power supply module, a clock circuit, and an AC impedance circuit connected with the auxiliary electrode, the guard ring electrode and the solid reference electrode of the corrosion monitoring sensor; the AC impedance circuit includes a power amplifier connected to the auxiliary electrode, a current constraint circuit connected to the guard ring electrode, and a main polarization circuit connected to the solid reference electrode. The invention provides a grounding grid online corrosion monitoring system which integrates the small-hole current limiting, guard ring electrode current constraint and AC impedance technology and is used for the long-term monitoring of grounding grid corrosion rate and soil resistivity.

Description

technical field [0001] The invention relates to the field of corrosion monitoring of grounding grids in power substations, in particular to a corrosion monitoring system for substation grounding grids, which is suitable for online monitoring of various buried grounding grid materials and evaluation of anti-corrosion measures. Background technique [0002] Low-carbon steel is generally used as the grounding grid material in my country. Under the action of acid, alkali, salt or microorganisms in the soil, corrosion occurs and causes the diameter of the conductor or underground lead wire to decrease or even break, resulting in deterioration of its electrical performance. In severe cases, it directly endangers stable operation of the grid. Because the grounding grid conductor is often buried in the soil and has strong concealment, the performance of the grounding grid in actual engineering can only be judged indirectly by the size of the grounding resistance, but this cannot accu...

AI Technical Summary

Problems solved by technology

Both of the above two methods rely on relatively complex large-scale instruments and software. For large and medium-sized ground grids, due to the large area of ​​the ground grid, there are many down-conductors connected to the ground grid, the installation process is time-consuming and laborious, and the monitoring is prone to failure Influenced by various disturbances in substations, not only the measurement results are inaccurate, but also the on-line corrosion monitoring of the grounding grid cannot be easily realized

Images