Abstract: The large amount of 3n-order harmonics generated by nonlinear electronic load devices leads to excessive current in the N line. As a result, problems such as wire heating, equipment damage, and potential safety hazards will occur, which seriously affect the safe and stable operation of the electrical system. Based on the problem of the excessively large current in the N wire, this paper analyzes the causes of the N wire current through theoretical analysis. By combining technical means such as intelligent harmonic monitoring, dynamic harmonic compensation, and three-phase unbalance management, a comprehensive terminal electrical governance solution is proposed. Field test applications have shown that this solution can effectively solve the problem of the excessively large current in the N wire, improve the safety and reliability of the system, and ensure the power quality of the power supply and distribution system.