JP cabinet (low-voltage AC integrated distribution box) is a comprehensive distribution product installed at the low voltage side of the transformer, which integrates power distribution, metering, protection, control and reactive compensation. It is composed of three parts: switch room, metering room and compensation room. The main components include circuit breaker, metering and measuring current transformer, energy meter and data acquisition terminal, distribution integrated control terminal Capacitor switching unit and self-healing low-voltage shunt capacitor, etc. Because of its advantages in power distribution, control, management, harmonic control and reactive power compensation, integrated distribution cabinets have been widely used in the transformation of urban and new rural power distribution systems. This product can improve the power factor of low-voltage distribution network, reduce losses, improve the quality of power supply at the load end, and improve the utilization of transformers and transmission lines. It is of great significance in energy conservation and loss reduction, strengthening the security and stable operation of the power system network, and improving the economic benefits of users.