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
Widely connected distributed power sources and large-scale controllable terminal loads have increased the complexity and perceived difficulty of dispatching management of the distribution network, resulting in an increasing amount of dispatching business and data information. In order to adapt to the "dual-carbon" development goals and the dispatching needs of smart city distribution network construction, first, from the perspective of distribution network dispatching, this paper proposes a comprehensive evaluation index system for dispatching operation management level considering technology and management. On this basis, the ordered weighted averaging(OWA) operator is used to improve the subjective extreme deviation of the analytic hierarchy process(AHP), and the subjective weight of the improved analytic hierarchy process(IAHP) is obtained. Meanwhile, the gray relational analysis(GRA) method is used to evaluate and decide the constructed evaluation index. Finally, this paper selects the actual city distribution network dispatch, evaluates its current dispatching management level, and verifies the feasibility and effectiveness of the proposed indicators and methods. This provides a reference for improving the management level of the distribution network dispatching operation and building a smart urban distribution network dispatching.
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