Fault Diagnosis of Grounding Grid Based on Self-Adaptive Particle Swarm Optimization

Abstract

To make effective fault diagnosis of grounding grid , a new method using Self-Adaptive Particle Swarm Optimization (SAPSO) is proposed. Firstly, the grounding grid can be handled as a resistive network to establish fault diagnosis equations. Then the objective function based on minimum energy principle is added to lower the ill-condition of diagnostic equation. Next, according to optimization techniques, a new method of SAPSO is proposed to solve the corrosion diagnosis equations. The method takes advantage of the high global searching ability of SAPSO to obtain the optimal solution to the diagnosis model. By means of the analysis of the simulation, the correctness and reliability of the method have been verified.

Research Advances of Soil Corrosion of Grounding Grids

“…With the continuous research and development of fault diagnosis technology, the current grounding grid fault diagnosis technology is mainly based on the three principles of electromagnetic field, electrical network, and electrochemistry. With the emergence of new technologies, fault diagnosis technologies combining matrix theory, ultrasonic testing, electromagnetic imaging, artificial intelligence, neural networks and other high-tech technologies are also being gradually developed and applied [ 7 , 91 , 92 , 93 , 94 , 95 ], as we try to obtain as much information as possible about the corrosion status of the grounding grid in the case of uninterrupted power and no excavation.…”

“…Because the electrical network method requires the ground lead wire as the observation point of the resistance network, its measurement range and accuracy are limited by the position and number of the ground lead wire. If the number of leads on the grounding grid is small and the locations are concentrated, the number of independent equations in the linear equations formed by the electrical network method will be small, and it will be difficult to solve the resistance value of each branch, which will cause difficulty in fault diagnosis [ 7 , 91 , 99 , 100 ]. Hu and Zeng [ 101 , 102 ] put forward a grounding grid fault diagnosis system based on Telegen′s theorem.…”

“…When the ground conductor fault occurs in the power system, the current cannot fully spread in the soil. In this case, the ground resistance and ground potential rise, and high voltage is connected to the secondary circuit, which affects the safe operation of electrical equipment and personal safety, causing major accidents and economic losses [ 3 , 6 , 7 ].…”