With the increase of the coverage area of the domestic distribution network, the probability of failure of the distribution network system is also greatly increased. In this paper, a grounding fault line selection system is designed for the small current grounding system of the distribution network. Firstly, taking the fault recorder as the data source, a single-phase grounding fault line selection system is built to monitor the single-phase grounding fault of the small current grounding system in the distribution network of each substation and select the fault line accurately and quickly. Finally, a 380 V physical simulation platform is built to simulate the fault line selection test. Taking Changchun area as an example, a single-phase ground fault occurs in the 66 kV system of Jingyang substation. Through the analysis of the system, the feasibility and accuracy of the line selection system are verified
With the continuous expansion of the scale of China's power system, higher and higher requirements are put forward for the security and reliability of the power system. Therefore, this article is aimed at the current situation that most power supply companies in our country use bus tie protection as a temporary protection method for lines to be put into operation, and need to cooperate with a large number of switching operations and extremely error-prone. This paper designs a kind of temporary protection device which can play a good role in the process of line operation. The PSCAD/EMTDC simulation software is used to verify that the protection device designed in this paper can not only reduce the operation link, but also reduce the risk of secondary equipment. It is of great practical value to improve the efficiency and ensure the safety of the line operation process.
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