**Advances and Challenges of Corrosion and TopologyDetection of Grounding Grid**

#### **Zhihong Fu 1,\*, Xiujuan Wang 1,\*, Qian Wang 2, Xiaobin Xu 1, Nengyi Fu 3 and Shanqiang Qin 1**


Received: 11 April 2019; Accepted: 30 May 2019; Published: 3 June 2019

**Abstract:** The grounding device plays performs the role of releasing a lightning current and a fault current in the power system, and the corrosion of the conductor will cause damage to the grounding body, which threatens the safe operation of the power system. The grounding grid corrosion detection technology and equipment guarantee the safe operation of the power system. This paper discusses the research status of grounding corrosion and topological detection in detail and introduces the basic principles, research difficulties and existing problems of the methods such as the electric network method, electromagnetic field method, electrochemical method, ultrasonic detection method and electromagnetic imaging method. The methods of electromagnetic imaging and time difference positioning proposed in recent years have been also discussed in detail. The paper points out that the application of grounding grid corrosion detection distance engineering still faces grea<sup>t</sup> challenges and that multi-disciplinary, multi-information fusion, new sensing technology, big data platforms and intelligent computing will be the trends to follow in research on grounding grid fault, corrosion detection and life prediction.

**Keywords:** grounding grid; metal corrosion; topology detection; corrosion detection; nondestructive testing
