The Research On Monitoring Approach And Realization For Grounding Grids

Grounding grids is an essential establishment which ensures the working grounding and protective grounding in power stations and substations. It is playing a vital role for the stable operation of power system. As burying underground, the method, which used to detect the status of the grounding grids, is to dig the grounding conductors out in a large area and then check them. This approach, with blindness and huge workload, may affect the operation of the power system. At present, the method of grounding grids non-excavation detection is still in theoretical research and technical analysis by initial stage, and there are few research results.This paper focuses on the research of grounding grids non-excavation detection technology, with the basis of a wide range of absorption from the latest research results on domestic and foreign grounding technology, corrosion detection technology, numerical analysis, signal processing technology, computer technology, electronics, pattern recognition and intelligent science and so on. This paper researches in-depth on principle and realization about status detection of grounding grids.With the analysis of all the existing detection methods for grounding grids and its limitations, and based on constant potential principle, this paper proposes a corrosion status detection method for grounding grids, using data smoothing technology, improving SNR (signal noise ratio), using the band stop filter, such as hardware and software filtering Technology, to effectively eliminate the noise disturbance at the scene and avoid the data errors of random sampling, to ensure the accuracy of the measure. And the analysis method of electrical performance parameters such as grounding resistance based on the corrosion status of grounding grids is discussed in this paper also. A specific implementation project on status detection of grounding grids is researched. This paper concentrates on the software system design of detection device, which includes signal collection, signal processing, data collection, data processing, man-machine conversation, and other subsystems. Through the final laboratory simulative experiments and field test, the effectiveness and the feasibility of the system is verified.Based on the research of this project, the team on this topic develops a portable instrument successfully, which can detect the corrosion velocity and corrosion depth of grounding grids at the scene and electrical performance parameters. This detector provides a light, fast, accurate and economic tool for the periodical detection of grounding grids in power stations and substations.